com.smartgwt.client.data

## Class DataSource

- java.lang.Object
- - com.smartgwt.client.core.BaseClass
  - - com.smartgwt.client.data.DataSource

- All Implemented Interfaces:
    com.google.gwt.event.shared.HasHandlers, HasHandleErrorHandlers
  Direct Known Subclasses:
    RestDataSource, WSDataSource, XJSONDataSource

      public class DataSource
      extends BaseClass
      implements HasHandleErrorHandlers

  A DataSource is data-provider-independent description of a set of objects that will be loaded, edited and saved within the user interface of your application.

  Each DataSource consists of a list of `fields` that make up a DataSource `record`, along with `field types`, `validation rules`, `relationships` to other DataSources, and other metadata.

  The abstract object description provided by a DataSource is easily mapped to a variety of backend object models and storage schemes. The following table shows analogous terminology across systems.

  Isomorphic Smart GWT | Relational Database | Enterprise Java Beans (EJB) | Entity/Relationship Modeling | OO/UML | XML Schema/WSDL | LDAP
  DataSource | Table | EJB class | Entity | Class | Element Schema (ComplexType) | Objectclass
  Record | Row | EJB instance | Entity instance | Class instance/Object | Element instance (ComplexType) | Entry
  Field | Column | Property | Attribute | Property/Attribute | Attribute or Element (SimpleType) | Attribute

  DataSources can be `declared` in either JavaScript or XML format, and can also be `imported` from existing metadata formats, including XML Schema.

  Data Binding is the process by which `Data Binding-capable UI components` can automatically configure themselves for viewing, editing and saving data described by DataSources. DataBinding is covered in the 'QuickStart Guide', Chapter 6, Data Binding.

  `Data Integration` is the process by which a DataSource can be connected to server systems such as SQL DataBases, Java Object models, WSDL web services and other data providers. Data Integration comes in two variants: client-side and server-side. `Server-side integration` uses the Smart GWT Java-based server to connect to data represented by Java Objects or JDBC-accessible databases. `Client-side integration` connects Smart GWT DataSources to XML, JSON or other formats accessible via HTTP.

  DataSources have a concept of `4 core operations` ("fetch", "add", "update" and "remove") that can be performed on the set of objects represented by a DataSource. Once a DataSource has been integrated with your data store, databinding-capable UI components can leverage the 4 core DataSource operations to provide many complete user interactions without the need to configure how each individual component loads and saves data.

  These interactions include `grid views`, `tree views`, `detail views`, `form`-based `editing` and `saving`, grid-based `editing` and `saving`, and custom interactions provided by Pattern Reuse Example custom databinding-capable components.

  See Also:
    `DataBoundComponent`, `ClientOnlyDataSources overview and related methods`

- - ### Field Summary

    - ### Fields inherited from class com.smartgwt.client.core.BaseClass

      `config, id, scClassName`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DataSource()`
    `DataSource(com.google.gwt.core.client.JavaScriptObject jsObj)`
    `DataSource(java.lang.String dataURL)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addData(Record newRecord)` Perform an "add" DataSource operation against this DataSource, to create a new DataSource record.
    `void` | `addData(Record newRecord, DSCallback callback)`
    `void` | `addData(Record newRecord, DSCallback callback, DSRequest requestProperties)` Perform an "add" DataSource operation against this DataSource, to create a new DataSource record.
    `void` | `addField(DataSourceField field)` Add a field to the DataSource
    `com.google.gwt.event.shared.HandlerRegistration` | `addHandleErrorHandler(HandleErrorHandler handler)` Add a handleError handler.
    `Record[]` | `applyFilter(Record[] records, Criteria criteria)` Returns records in the passed Record that match the provided filter `Criteria`.
    `Record[]` | `applyFilter(Record[] records, Criteria criteria, DSRequest requestProperties)` Returns records in the passed Record that match the provided filter `Criteria`.
    `static Criteria` | `combineCriteria(Criteria criteria1, Criteria criteria2)` Combines two criteria (either simple criteria objects or AdvancedCriteria) using the "outerOperator".
    `static Criteria` | `combineCriteria(Criteria criteria1, Criteria criteria2, CriteriaCombineOperator outerOperator)` Combines two criteria (either simple criteria objects or AdvancedCriteria) using the "outerOperator".
    `static Criteria` | `combineCriteria(Criteria criteria1, Criteria criteria2, CriteriaCombineOperator outerOperator, TextMatchStyle textMatchStyle)` Combines two criteria (either simple criteria objects or AdvancedCriteria) using the "outerOperator".
    `int` | `compareCriteria(Criteria newCriteria, Criteria oldCriteria)` Given two sets of criteria, determine whether they are equivalent, the new criteria is guaranteed more restrictive, or the new criteria is not guaranteed more restrictive, returning 0, 1 or -1 respectively.
    `int` | `compareCriteria(Criteria newCriteria, Criteria oldCriteria, DSRequest requestProperties)`
    `int` | `compareCriteria(Criteria newCriteria, Criteria oldCriteria, DSRequest requestProperties, java.lang.String policy)` Given two sets of criteria, determine whether they are equivalent, the new criteria is guaranteed more restrictive, or the new criteria is not guaranteed more restrictive, returning 0, 1 or -1 respectively.
    `int` | `compareDates(java.util.Date date1, java.util.Date date2, java.lang.String fieldName)` Convenience method to compare two Date objects appropriately, depending on whether the passed-in fieldName refers to a field of `type` "datetime" or "date".
    `static AdvancedCriteria` | `convertCriteria(Criteria criteria)` Converts criteria expressed in Smart GWT's simple criteria format to an AdvancedCriteria object.
    `static AdvancedCriteria` | `convertCriteria(Criteria criteria, TextMatchStyle textMatchStyle)` Converts criteria expressed in Smart GWT's simple criteria format to an AdvancedCriteria object.
    `Criteria` | `convertRelativeDates(Criteria criteria)` Takes all relative date values found anywhere within a Criteria / AdvancedCriteria object and converts them to concrete date values, returning the new criteria object.
    `Criteria` | `convertRelativeDates(Criteria criteria, java.lang.String timezoneOffset)`
    `Criteria` | `convertRelativeDates(Criteria criteria, java.lang.String timezoneOffset, java.lang.Integer firstDayOfWeek)` Takes all relative date values found anywhere within a Criteria / AdvancedCriteria object and converts them to concrete date values, returning the new criteria object.
    `static Criteria` | `copyCriteria(Criteria criteria)` Create a copy of a criteria.
    `Record` | `copyRecord(Record record)` Copies all DataSource field values of a Record (including a TreeNode) to a new Record, omitting component-specific metadata such as selected state from grids, or parent folders for TreeNodes.
    `Record[]` | `copyRecords(Record... records)` Copies all DataSource field values of an (Array) of Records (including a TreeNode) to a new array of Records, omitting component-specific metadata such as selected state from grids, or parent folders for TreeNodes.
    `com.google.gwt.core.client.JavaScriptObject` | `create()`
    `void` | `downloadFile(Record data)` Download a file stored in a field of type:"binary" in a DataSource record.
    `void` | `downloadFile(Record data, java.lang.String fieldName)`
    `void` | `downloadFile(Record data, java.lang.String fieldName, DSRequest requestProperties)` Download a file stored in a field of type:"binary" in a DataSource record.
    `boolean` | `evaluateCriterion(Record record, Criterion criterion)` Evaluate the given criterion with respect to the passed record.
    `void` | `exportClientData(java.lang.Object[] data, DSRequest requestProperties)` Exports arbitrary client-side data, with client-side formatters applied, so is suitable for direct display to users.
    `static void` | `exportClientDataStatic(java.lang.Object[] data, DSRequest requestProperties)` Exports arbitrary client-side data, with client-side formatters applied, so is suitable for direct display to users.
    `void` | `exportData()` Perform a "fetch" DataSource operation against this DataSource, sending search criteria, retrieving matching records and exporting the results.
    `void` | `exportData(Criteria criteria)`
    `void` | `exportData(Criteria criteria, DSRequest requestProperties)`
    `void` | `exportData(Criteria criteria, DSRequest requestProperties, DSCallback callback)` Perform a "fetch" DataSource operation against this DataSource, sending search criteria, retrieving matching records and exporting the results.
    `void` | `fetchData()` Perform a "fetch" DataSource operation against this DataSource, sending search criteria and retrieving matching records.
    `void` | `fetchData(Criteria criteria)`
    `void` | `fetchData(Criteria criteria, DSCallback callback)`
    `void` | `fetchData(Criteria criteria, DSCallback callback, DSRequest requestProperties)` Perform a "fetch" DataSource operation against this DataSource, sending search criteria and retrieving matching records.
    `void` | `fetchRecord(java.lang.Object pkValue)` Fetch a single record from the DataSource by `primary key`.
    `void` | `fetchRecord(java.lang.Object pkValue, DSCallback callback)`
    `void` | `fetchRecord(java.lang.Object pkValue, DSCallback callback, DSRequest requestProperties)` Fetch a single record from the DataSource by `primary key`.
    `boolean` | `fieldMatchesFilter(java.lang.Object fieldValue, java.lang.Object filterValue)` Compares a criteria value to a field value and returns whether they match, as follows: any non-String filter value is directly compared (==) to the field value any String filter value is compared according to `textMatchStyle` in the passed `requestProperties`, regardless of the actual field type if the filter value is an Array, the comparison is a logical OR.
    `boolean` | `fieldMatchesFilter(java.lang.Object fieldValue, java.lang.Object filterValue, DSRequest requestProperties)` Compares a criteria value to a field value and returns whether they match, as follows: any non-String filter value is directly compared (==) to the field value any String filter value is compared according to `textMatchStyle` in the passed `requestProperties`, regardless of the actual field type if the filter value is an Array, the comparison is a logical OR.
    `void` | `filterData()` Perform a "fetch" DataSource operation against this DataSource, sending search criteria and retrieving matching records.
    `void` | `filterData(Criteria criteria)`
    `void` | `filterData(Criteria criteria, DSCallback callback)`
    `void` | `filterData(Criteria criteria, DSCallback callback, DSRequest requestProperties)` Perform a "fetch" DataSource operation against this DataSource, sending search criteria and retrieving matching records.
    `static DataSource` | `get(java.lang.String ID)` Synonym of `DataSource.getDataSource`: Lookup a DataSource by ID.
    `static DataSource` | `get(java.lang.String ID, RequestTransformer requestTransformer, ResponseTransformer responseTransformer)` Synonym of `DataSource.getDataSource`: Lookup a DataSource by ID.
    `java.lang.Boolean` | `getAddGlobalId()` Whether to make this DataSource available as a global variable for convenience.
    `java.lang.Boolean` | `getAllowAdvancedCriteria()` By default, all DataSources are assumed to be capable of handling `AdvancedCriteria` on fetch or filter type operations.
    `java.lang.Boolean` | `getAutoCacheAllData()` When a DataSource is not `cacheAllData`:true and a fetch results in the entire dataset being retrieved, this attribute being set to true causes the DataSource to automatically switch to `cacheAllData:true` and prevent further server-trips for fetch requests.
    `java.lang.Boolean` | `getAutoConvertRelativeDates()` Whether to convert relative date values to concrete date values before sending to the server.
    `boolean` | `getAutoDeriveTitles()` If set, titles are automatically derived from `field.name` for any field that does not have a `field.title` and is not marked `hidden`:true, by calling the method `DataSource.getAutoTitle`.
    `static java.lang.String` | `getAutoTitle(java.lang.String identifier)` Utility method to derive a reasonable user-visible title from an identifier.
    `java.lang.Boolean` | `getCacheAcrossOperationIds()` When `cacheAllData` mode is enabled and a `cacheAllOperationId` has been set, this flag affects whether cached results are used for all "fetch" requests regardless of their `operationId`, or are used only for "fetch" requests that use the `cacheAllOperationId`, allowing other requests to go to server normally.
    `java.lang.Boolean` | `getCacheAllData()` Set this property to true to have a DataSource fetch all of its data client-side on the first fetch request.
    `java.lang.String` | `getCacheAllOperationId()` `operationId` to use for fetching data in case `cacheAllData` is true.
    `Record[]` | `getCacheData()` For a `cacheAllData` or client-only DataSource, a set of records to use as a dataset, specified as an Array of JavaScript Objects representing records.
    `int` | `getCacheMaxAge()` The maximum time, in seconds, to maintain the client-side cache.
    `java.lang.String` | `getCallbackParam()` Applies only to dataFormat: "json" and `dataTransport`:"scriptInclude".
    `boolean` | `getCanMultiSort()` When true, indicates that this DataSource supports multi-level sorting.
    `java.lang.String` | `getChildrenField()` fieldName for a field in the dataSource expected to contain an explicit array of child nodes.
    `java.lang.Boolean` | `getClientOnly()` A clientOnly DataSource simulates the behavior of a remote data store by manipulating a static dataset in memory as `DSRequests` are executed on it.
    `void` | `getClientOnlyDataSource(Criteria criteria, ClientOnlyDataSourceCallback callback)` Produces a clientOnly "copy" of a particular subset of data from a normal DataSource, via calling fetchData() to fetch matching rows, and constructing a clientOnly DataSource that `inheritsFrom` the original DataSource.
    `void` | `getClientOnlyDataSource(Criteria criteria, ClientOnlyDataSourceCallback callback, DSRequest requestProperties)`
    `void` | `getClientOnlyDataSource(Criteria criteria, ClientOnlyDataSourceCallback callback, DSRequest requestProperties, DataSource dataSourceProperties)` Produces a clientOnly "copy" of a particular subset of data from a normal DataSource, via calling fetchData() to fetch matching rows, and constructing a clientOnly DataSource that `inheritsFrom` the original DataSource.
    `protected DSResponse` | `getClientOnlyResponse(DSRequest request, Record... serverData)` Return a "spoofed" response for a `clientOnly` or `cacheAllData` DataSource.
    `CriteriaPolicy` | `getCriteriaPolicy()` Decides under what conditions the `ResultSet` cache should be dropped when the `criteria` changes.
    `java.lang.String` | `getDataField()` Name of the field that has the most pertinent numeric, date, or enum value, for use when a `DataBoundComponent` needs to show a short summary of a record.
    `DSDataFormat` | `getDataFormat()` Indicates the format to be used for HTTP requests and responses when fulfilling DSRequests (eg, when `DataSource.fetchData` is called).
    `DSProtocol` | `getDataProtocol()` Controls the format in which inputs are sent to the dataURL when fulfilling DSRequests.
    `static DataSource` | `getDataSource(java.lang.String ID)` Lookup a DataSource by ID.
    `static DataSource` | `getDataSource(java.lang.String ID, RequestTransformer requestTransformer, ResponseTransformer responseTransformer)` Lookup a DataSource by ID with an optional RequestTransformer and ResponseTransformer.
    `RPCTransport` | `getDataTransport()` Transport to use for all operations on this DataSource.
    `java.lang.String` | `getDataURL()` Default URL to contact to fulfill all DSRequests.
    `java.util.Map` | `getDefaultParams()` HTTP parameters that should be submitted with every DSRequest.
    `java.lang.String` | `getDescriptionField()` Name of the field that has a long description of the record, or has the primary text data value for a record that represents an email message, SMS, log or similar.
    `java.lang.Object` | `getDisplayValue(java.lang.String fieldName, java.lang.Object value)` Given a fieldName and a dataValue, apply any `valueMap` for the field and return the display value for the field
    `java.lang.Boolean` | `getDropExtraFields()` Indicates that for server responses, for any data being interpreted as DataSource records, only data that corresponds to declared fields should be retained; any extra fields should be discarded.
    `java.lang.Boolean` | `getDropUnknownCriteria()` If the criteria applied to a fetch type operation contain fields that are not present in the dataSource, should they be ignored when performing filtering on the client.
    `java.lang.String` | `getFetchDataURL(Criteria criteria)` Returns a URL to DataSource fetch operation.
    `java.lang.String` | `getFetchDataURL(Criteria criteria, DSRequest requestProperties)` Returns a URL to DataSource fetch operation.
    `DataSourceField` | `getField(java.lang.String fieldName)` Return the field definition object.
    `java.lang.String` | `getFieldAutoTitle(java.lang.String identifier)` Return a reasonable user-visible title given a fieldName.
    `Criteria` | `getFieldCriterion(Criteria criterion, java.lang.String fieldName)` Returns the depth-first match of a criterion matching the given fieldName.
    `DataSourceField` | `getFieldForDataPath(java.lang.String dataPath)` Return the field definition object corresponding to the supplied dataPath
    `java.lang.String[]` | `getFieldNames()` Retrieves the list of fields declared on this DataSource.
    `java.lang.String[]` | `getFieldNames(boolean excludeHidden)` Retrieves the list of fields declared on this DataSource.
    `OperatorId[]` | `getFieldOperators(DataSourceField field)` Get the list of OperatorId's available for this field.
    `OperatorId[]` | `getFieldOperators(java.lang.String fieldName)` Get the list of OperatorId's available for this field.
    `DataSourceField[]` | `getFields()` The list of fields that compose records from this DataSource.
    `static java.lang.Object` | `getFieldValue(DataSourceField field, Record record)` Given a field definition and a record object, this method will return the field value for the record.
    `static java.lang.Object` | `getFieldValue(DetailViewerField field, Record record)` Given a field definition and a record object, this method will return the field value for the record.
    `static java.lang.Object` | `getFieldValue(FormItem field, Record record)` Given a field definition and a record object, this method will return the field value for the record.
    `static java.lang.Object` | `getFieldValue(ListGridField field, Record record)` Given a field definition and a record object, this method will return the field value for the record.
    `java.lang.String` | `getFileURL(Record data)` Returns a direct URL to access a file stored in a field of type:"binary".
    `java.lang.String` | `getFileURL(Record data, java.lang.String fieldName)` Returns a direct URL to access a file stored in a field of type:"binary".
    `java.lang.String` | `getFileURL(Record data, java.lang.String fieldName, DSRequest requestProperties)` Returns a direct URL to access a file stored in a field of type:"binary".
    `java.util.Map` | `getGlobalNamespaces()` Namespaces definitions to add to the root element of outbound XML messages sent to a web service, as a mapping from namespace prefix to namespace URI.
    `java.lang.String` | `getIconField()` Designates a field of `type`:"image" as the field to use when rendering a record as an image, for example, in a `TileGrid`.
    `java.lang.String` | `getInfoField()` Name of the field that has the second most pertinent piece of textual information in the record, for use when a `DataBoundComponent` needs to show a short summary of a record.
    `java.lang.String` | `getInheritsFrom()` ID of another DataSource this DataSource inherits its `fields` from.
    `com.google.gwt.core.client.JavaScriptObject` | `getJsObj()`
    `java.lang.String` | `getJsonPrefix()` Allows you to specify an arbitrary prefix string to apply to all json format responses sent from the server to this application.
    `java.lang.String` | `getJsonSuffix()` Allows you to specify an arbitrary suffix string to apply to all json format responses sent from the server to this application.
    `void` | `getLegalChildTags()` For a DataSource that describes a DOM structure, the list of legal child elements that can be contained by the element described by this DataSource.
    `OperationBinding[]` | `getOperationBindings()` Optional array of OperationBindings, which provide instructions to the DataSource about how each DSOperation is to be performed.
    `static DataSource` | `getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)`
    `java.lang.String` | `getPluralTitle()` User-visible plural name for this DataSource.
    `java.lang.Boolean` | `getPreventHTTPCaching()` If set, the DataSource will ensure that it never uses a cached HTTP response, even if the server marks the response as cacheable.
    `DataSourceField` | `getPrimaryKeyField()` Returns a pointer to the primaryKey field for this DataSource.
    `java.lang.String` | `getPrimaryKeyFieldName()` Returns the primary key fieldName for this DataSource.
    `java.lang.String[]` | `getPrimaryKeyFieldNames()` Returns a list of the names of this DataSource's `primaryKey` fields.
    `Record` | `getPrimaryKeyFields()` Returns this DataSource's `primaryKey` fields as a map of fieldName to field.
    `java.lang.Boolean` | `getProgressiveLoading()` If true, causes Smart GWT Server to use the "progressive loading" pattern for fetches on this dataSource, as described in the Paging and total dataset length section of the `ResultSet documentation`.
    `java.lang.Boolean` | `getQualifyColumnNames()` For dataSources of `serverType` "sql", determines whether we qualify column names with table names in any SQL we generate.
    `java.lang.String` | `getRecordXPath()` See `recordXPath`.
    `DSRequest` | `getRequestProperties()` Additional properties to pass through to the `DSRequest`s made by this DataSource.
    `java.lang.String` | `getRequiredMessage()` The required message when a field that has been marked as `required` is not filled in by the user.
    `int` | `getResultBatchSize()` Very advanced: for servers that do not support paging, and must return large numbers of XML records in one HTTP response, Smart GWT breaks up the processing of the response in order to avoid the "script running slowly" dialog appearing for an end user.
    `java.lang.String` | `getResultSetClass()` Class for ResultSets used by this datasource.
    `java.lang.String` | `getSchemaNamespace()` For a DataSource derived from WSDL or XML schema, the XML namespace this schema belongs to.
    `java.lang.Boolean` | `getSendExtraFields()` Analogous to `dropExtraFields`, for data sent to the server.
    `java.lang.Boolean` | `getSendParentNode()` Set this attribute if you need to send the dsRequest.parentNode to the server-side.
    `java.lang.String` | `getServiceNamespace()` For an XML DataSource, URN of the WebService to use to invoke operations.
    `java.lang.Boolean` | `getShowLocalFieldsOnly()` For a DataSource that inherits `fields` from another DataSource (via `inheritsFrom`), indicates that only the fields listed in this DataSource should be shown.
    `java.lang.Boolean` | `getShowPrompt()` Whether RPCRequests sent by this DataSource should enable `showPrompt` in order to block user interactions until the request completes.
    `static java.lang.String[]` | `getSortBy(java.lang.String[] sortSpecifiers)` Given an array of ${isc.DocUtils.linkForRef('object:SortSpecifier')}s, return a simple list of Strings in the format expected by `sortBy`.
    `static java.lang.String[]` | `getSortSpecifiers(java.lang.String[] sortBy)` Return a an array of `SortSpecifier`s, given an array of Strings in the format expected by `sortBy`.
    `java.lang.Boolean` | `getStrictSQLFiltering()` If set to true, both client and server-side advanced filtering used by Smart GWT will follow SQL99 behavior for dealing with NULL values, which is often counter-intuitive to users.
    `java.lang.String` | `getTagName()` Tag name to use when serializing to XML.
    `Record[]` | `getTestData()` For a client-only DataSource, a set of records to use as a dataset, specified as an Array of JavaScript Objects.
    `java.lang.String` | `getTitle()` User-visible name for this DataSource.
    `java.lang.String` | `getTitleField()` Best field to use for a user-visible title for an individual record from this dataSource.
    `OperatorId[]` | `getTypeOperators(FieldType fieldType)` Get the list of OperatorIds available on this DataSource for the given FieldType.
    `java.lang.Boolean` | `getUseFlatFields()` Like `useFlatFields`, but applies to all DataBound components that bind to this DataSource.
    `java.lang.Boolean` | `getUseHttpProxy()` Like `useHttpProxy`, but serves as a default for this DataSource that may be overridden by individual operationBindings.
    `java.lang.Boolean` | `getUseLocalValidators()` Whether to attempt validation on the client at all for this DataSource.
    `java.lang.Boolean` | `getUseOfflineStorage()` Whether we store server responses for this DataSource into `browser-based offline storage`, and then use those stored responses at a later time if we are offline (ie, the application cannot connect to the server).
    `java.lang.Boolean` | `getUseParentFieldOrder()` For a DataSource that inherits `fields` from another DataSource (via `inheritsFrom`), indicates that the parent's field order should be used instead of the order of the fields as declared in this DataSource.
    `java.lang.Boolean` | `getUseStrictJSON()` Should HTTP responses to requests by this dataSource be formatted using the strict JSON subset of the javascript language? If set to true, responses returned by the server should match the format described here.
    `java.lang.Boolean` | `getUseTestDataFetch()` When set, causes a `client-only` or `cacheAllData` DataSource to create a second DataSource to perform it's one-time fetch.
    `java.lang.Boolean` | `getValidateRelatedRecords()` If true, indicates that the Smart GWT Server should automatically apply a `ValidatorType` of "hasRelatedRecord" to every field on this dataSource that has a `foreignKey` defined.
    `java.lang.Boolean` | `hasAllData()` When `cacheAllData` is true, has all the data been retrieved to the client?
    `void` | `invalidateCache()` Invalidate the cache when `cacheAllData` or `clientOnly` are true.
    `boolean` | `isCreated()`
    `static void` | `load(java.lang.String[] dsID, Function callback, boolean forceReload)` Load a DataSource or an array of DataSources using the DataSourceLoader servlet.
    `static void` | `load(java.lang.String dsID, Function callback, boolean forceReload)` Load a DataSource or an array of DataSources using the DataSourceLoader servlet.
    `static void` | `loadWithParents(java.lang.String[] dsID, Function callback, boolean forceReload)` Variation of `DataSource.load` that will also automatically load any DataSources that the requested DataSources inherit from (via {@link com.smartgwt.client.data.DataSource#inheritsFrom DataSource.inheritsFrom))
    `static void` | `loadWithParents(java.lang.String dsID, Function callback, boolean forceReload)` Variation of `DataSource.load` that will also automatically load any DataSources that the requested DataSources inherit from (via {@link com.smartgwt.client.data.DataSource#inheritsFrom DataSource.inheritsFrom))
    `protected void` | `onInit()`
    `void` | `performCustomOperation(java.lang.String operationId)` Invoke an operation declared with `operationType` "custom".
    `void` | `performCustomOperation(java.lang.String operationId, Record data)`
    `void` | `performCustomOperation(java.lang.String operationId, Record data, DSCallback callback)`
    `void` | `performCustomOperation(java.lang.String operationId, Record data, DSCallback callback, DSRequest requestProperties)` Invoke an operation declared with `operationType` "custom".
    `void` | `processResponse(java.lang.String requestId, DSResponse dsResponse)` Process a dsResponse for a request initiated by a DataSource with `dataProtocol:"clientCustom"`.
    `java.lang.String` | `recordsAsText(Record[] records)` Converts a list of Records to simple text formats with a Record per line and values separated by a configurable separator, including both tab-separated-values and comma-separated-values (aka CSV).
    `java.lang.String` | `recordsAsText(Record[] records, TextExportSettings settings)` Converts a list of Records to simple text formats with a Record per line and values separated by a configurable separator, including both tab-separated-values and comma-separated-values (aka CSV).
    `Record[]` | `recordsFromText(java.lang.String text)` Derive a set of Records from Microsoft Excel-compatible tab-separated-values format, using the current DataSource field order, or an explicitly specified list of fields.
    `Record[]` | `recordsFromText(java.lang.String text, TextImportSettings settings)` Derive a set of Records from Microsoft Excel-compatible tab-separated-values format, using the current DataSource field order, or an explicitly specified list of fields.
    `Record[]` | `recordsFromXML(java.lang.Object elements)` Transform a list of XML elements to DataSource records.
    `protected void` | `registerID(java.lang.String id, boolean skipUniqueJSIdentifierCheck)`
    `void` | `removeData(Record data)` Perform a "remove" DataSource operation against this DataSource, to delete an existing DataSource record.
    `void` | `removeData(Record data, DSCallback callback)`
    `void` | `removeData(Record data, DSCallback callback, DSRequest requestProperties)` Perform a "remove" DataSource operation against this DataSource, to delete an existing DataSource record.
    `void` | `setAddGlobalId(java.lang.Boolean addGlobalId)` Whether to make this DataSource available as a global variable for convenience.
    `void` | `setAllowAdvancedCriteria(java.lang.Boolean allowAdvancedCriteria)` By default, all DataSources are assumed to be capable of handling `AdvancedCriteria` on fetch or filter type operations.
    `void` | `setAutoCacheAllData(java.lang.Boolean autoCacheAllData)` When a DataSource is not `cacheAllData`:true and a fetch results in the entire dataset being retrieved, this attribute being set to true causes the DataSource to automatically switch to `cacheAllData:true` and prevent further server-trips for fetch requests.
    `void` | `setAutoConvertRelativeDates(java.lang.Boolean autoConvertRelativeDates)` Whether to convert relative date values to concrete date values before sending to the server.
    `void` | `setAutoDeriveTitles(boolean autoDeriveTitles)` If set, titles are automatically derived from `field.name` for any field that does not have a `field.title` and is not marked `hidden`:true, by calling the method `DataSource.getAutoTitle`.
    `void` | `setCacheAcrossOperationIds(java.lang.Boolean cacheAcrossOperationIds)` When `cacheAllData` mode is enabled and a `cacheAllOperationId` has been set, this flag affects whether cached results are used for all "fetch" requests regardless of their `operationId`, or are used only for "fetch" requests that use the `cacheAllOperationId`, allowing other requests to go to server normally.
    `void` | `setCacheAllData(java.lang.Boolean cacheAllData)` Set this property to true to have a DataSource fetch all of its data client-side on the first fetch request.
    `void` | `setCacheAllOperationId(java.lang.String cacheAllOperationId)` `operationId` to use for fetching data in case `cacheAllData` is true.
    `void` | `setCacheData(Record... cacheData)` For a `cacheAllData` or client-only DataSource, a set of records to use as a dataset, specified as an Array of JavaScript Objects representing records.
    `void` | `setCacheMaxAge(int cacheMaxAge)` The maximum time, in seconds, to maintain the client-side cache.
    `void` | `setCallbackParam(java.lang.String callbackParam)` Applies only to dataFormat: "json" and `dataTransport`:"scriptInclude".
    `void` | `setCanMultiSort(boolean canMultiSort)` When true, indicates that this DataSource supports multi-level sorting.
    `void` | `setChildrenField(java.lang.String childrenField)` fieldName for a field in the dataSource expected to contain an explicit array of child nodes.
    `void` | `setClientOnly(java.lang.Boolean clientOnly)` A clientOnly DataSource simulates the behavior of a remote data store by manipulating a static dataset in memory as `DSRequests` are executed on it.
    `void` | `setCriteriaPolicy(CriteriaPolicy criteriaPolicy)` Decides under what conditions the `ResultSet` cache should be dropped when the `criteria` changes.
    `void` | `setDataField(java.lang.String dataField)` Name of the field that has the most pertinent numeric, date, or enum value, for use when a `DataBoundComponent` needs to show a short summary of a record.
    `void` | `setDataFormat(DSDataFormat dataFormat)` Indicates the format to be used for HTTP requests and responses when fulfilling DSRequests (eg, when `DataSource.fetchData` is called).
    `void` | `setDataProtocol(DSProtocol dataProtocol)` Controls the format in which inputs are sent to the dataURL when fulfilling DSRequests.
    `void` | `setDataTransport(RPCTransport dataTransport)` Transport to use for all operations on this DataSource.
    `void` | `setDataURL(java.lang.String dataURL)` Default URL to contact to fulfill all DSRequests.
    `void` | `setDefaultParams(java.util.Map defaultParams)` HTTP parameters that should be submitted with every DSRequest.
    `void` | `setDescriptionField(java.lang.String descriptionField)` Name of the field that has a long description of the record, or has the primary text data value for a record that represents an email message, SMS, log or similar.
    `void` | `setDropExtraFields(java.lang.Boolean dropExtraFields)` Indicates that for server responses, for any data being interpreted as DataSource records, only data that corresponds to declared fields should be retained; any extra fields should be discarded.
    `void` | `setDropUnknownCriteria(java.lang.Boolean dropUnknownCriteria)` If the criteria applied to a fetch type operation contain fields that are not present in the dataSource, should they be ignored when performing filtering on the client.
    `void` | `setEnumConstantProperty(java.lang.String enumConstantProperty)` The name of the property this DataSource uses for constant name when translating Java enumerated types to and from Javascript, if the `EnumTranslateStrategy` is set to "bean".
    `void` | `setEnumOrdinalProperty(java.lang.String enumOrdinalProperty)` The name of the property this DataSource uses for ordinal number when translating Java enumerated types to and from Javascript, if the `EnumTranslateStrategy` is set to "bean".
    `void` | `setEnumTranslateStrategy(EnumTranslateStrategy enumTranslateStrategy)` Sets the strategy this DataSource uses to translate Java enumerated types (objects of type enum) to and from Javascript.
    `void` | `setFields(DataSourceField... fields)` The list of fields that compose records from this DataSource.
    `void` | `setGlobalNamespaces(java.util.Map globalNamespaces)` Namespaces definitions to add to the root element of outbound XML messages sent to a web service, as a mapping from namespace prefix to namespace URI.
    `void` | `setHandleErrorCallback(HandleErrorCallback callback)` If you define this method on a DataSource, it will be called whenever the server returns a DSResponse with a status other than `STATUS_SUCCESS`.
    `void` | `setIconField(java.lang.String iconField)` Designates a field of `type`:"image" as the field to use when rendering a record as an image, for example, in a `TileGrid`.
    `void` | `setID(java.lang.String id)`
    `void` | `setInfoField(java.lang.String infoField)` Name of the field that has the second most pertinent piece of textual information in the record, for use when a `DataBoundComponent` needs to show a short summary of a record.
    `void` | `setInheritsFrom(DataSource inheritsFrom)` ID of another DataSource this DataSource inherits its DataSource fields from. Local fields (fields defined in this DataSource) are added to inherited fields to form the full set of fields.
    `void` | `setInheritsFrom(java.lang.String inheritsFrom)` ID of another DataSource this DataSource inherits its `fields` from.
    `void` | `setJavaScriptObject(com.google.gwt.core.client.JavaScriptObject jsObj)`
    `void` | `setJsonPrefix(java.lang.String jsonPrefix)` Allows you to specify an arbitrary prefix string to apply to all json format responses sent from the server to this application.
    `void` | `setJsonSuffix(java.lang.String jsonSuffix)` Allows you to specify an arbitrary suffix string to apply to all json format responses sent from the server to this application.
    `void` | `setOperationBindings(OperationBinding... operationBindings)` Optional array of OperationBindings, which provide instructions to the DataSource about how each DSOperation is to be performed.
    `void` | `setPluralTitle(java.lang.String pluralTitle)` User-visible plural name for this DataSource.
    `void` | `setPreventHTTPCaching(java.lang.Boolean preventHTTPCaching)` If set, the DataSource will ensure that it never uses a cached HTTP response, even if the server marks the response as cacheable.
    `void` | `setProgressiveLoading(java.lang.Boolean progressiveLoading)` If true, causes Smart GWT Server to use the "progressive loading" pattern for fetches on this dataSource, as described in the Paging and total dataset length section of the `ResultSet documentation`.
    `void` | `setQualifyColumnNames(java.lang.Boolean qualifyColumnNames)` For dataSources of `serverType` "sql", determines whether we qualify column names with table names in any SQL we generate.
    `void` | `setRecordName(java.lang.String recordName)` See `recordName`.
    `void` | `setRecordXPath(java.lang.String recordXPath)` See `recordXPath`.
    `void` | `setRequestProperties(DSRequest requestProperties)` Additional properties to pass through to the `DSRequest`s made by this DataSource.
    `void` | `setRequiredMessage(java.lang.String requiredMessage)` The required message when a field that has been marked as `required` is not filled in by the user.
    `void` | `setResultBatchSize(int resultBatchSize)` Very advanced: for servers that do not support paging, and must return large numbers of XML records in one HTTP response, Smart GWT breaks up the processing of the response in order to avoid the "script running slowly" dialog appearing for an end user.
    `void` | `setResultSetClass(java.lang.String resultSetClass)` Class for ResultSets used by this datasource.
    `void` | `setSendExtraFields(java.lang.Boolean sendExtraFields)` Analogous to `dropExtraFields`, for data sent to the server.
    `void` | `setSendParentNode(java.lang.Boolean sendParentNode)` Set this attribute if you need to send the dsRequest.parentNode to the server-side.
    `void` | `setServiceNamespace(java.lang.String serviceNamespace)` For an XML DataSource, URN of the WebService to use to invoke operations.
    `void` | `setShowLocalFieldsOnly(java.lang.Boolean showLocalFieldsOnly)` For a DataSource that inherits `fields` from another DataSource (via `inheritsFrom`), indicates that only the fields listed in this DataSource should be shown.
    `void` | `setShowPrompt(java.lang.Boolean showPrompt)` Whether RPCRequests sent by this DataSource should enable `showPrompt` in order to block user interactions until the request completes.
    `void` | `setStrictSQLFiltering(java.lang.Boolean strictSQLFiltering)` If set to true, both client and server-side advanced filtering used by Smart GWT will follow SQL99 behavior for dealing with NULL values, which is often counter-intuitive to users.
    `void` | `setTagName(java.lang.String tagName)` Tag name to use when serializing to XML.
    `void` | `setTestData(Record... cacheData)` For a client-only DataSource, a set of records to use as a dataset, specified as an Array of JavaScript Objects.
    `void` | `setTitle(java.lang.String title)` User-visible name for this DataSource.
    `void` | `setTitleField(java.lang.String titleField)` Best field to use for a user-visible title for an individual record from this dataSource.
    `void` | `setTypeOperators(FieldType fieldType, OperatorId[] operators)` Set the list of `OperatorIds` valid for a given FieldType.
    `void` | `setUseFlatFields(java.lang.Boolean useFlatFields)` Like `useFlatFields`, but applies to all DataBound components that bind to this DataSource.
    `void` | `setUseHttpProxy(java.lang.Boolean useHttpProxy)` Like `useHttpProxy`, but serves as a default for this DataSource that may be overridden by individual operationBindings.
    `void` | `setUseLocalValidators(java.lang.Boolean useLocalValidators)` Whether to attempt validation on the client at all for this DataSource.
    `void` | `setUseOfflineStorage(java.lang.Boolean useOfflineStorage)` Whether we store server responses for this DataSource into `browser-based offline storage`, and then use those stored responses at a later time if we are offline (ie, the application cannot connect to the server).
    `void` | `setUseParentFieldOrder(java.lang.Boolean useParentFieldOrder)` For a DataSource that inherits `fields` from another DataSource (via `inheritsFrom`), indicates that the parent's field order should be used instead of the order of the fields as declared in this DataSource.
    `void` | `setUseStrictJSON(java.lang.Boolean useStrictJSON)` Should HTTP responses to requests by this dataSource be formatted using the strict JSON subset of the javascript language? If set to true, responses returned by the server should match the format described here.
    `void` | `setUseTestDataFetch(java.lang.Boolean useTestDataFetch)` When set, causes a `client-only` or `cacheAllData` DataSource to create a second DataSource to perform it's one-time fetch.
    `void` | `setValidateRelatedRecords(java.lang.Boolean validateRelatedRecords)` If true, indicates that the Smart GWT Server should automatically apply a `ValidatorType` of "hasRelatedRecord" to every field on this dataSource that has a `foreignKey` defined.
    `void` | `setXmlNamespaces(XmlNamespaces xmlNamespaces)` Optional object declaring namespace prefixes for use in OperationBinding.recordXPath and DataSourceField.valueXPath XPath expressions.
    `Criteria` | `splitCriteria(Criteria criteria, java.lang.String[] fields)` Split a criteria apart based on `fields`.
    `java.lang.Boolean` | `supportsAdvancedCriteria()` Do fetch and filter operations on this dataSource support being passed `AdvancedCriteria`?
    `void` | `supportsTextMatchStyle(TextMatchStyle textMatchStyle)` Does this dataSource support the specified "textMatchStyle" when performing a filter operation against a text field.
    `protected java.lang.Object` | `transformRequest(DSRequest dsRequest)` For a dataSource using `client-side data integration`, return the data that should be sent to the `dataURL`.
    `protected void` | `transformResponse(DSResponse dsResponse, DSRequest dsRequest, java.lang.Object data)` Modify the DSResponse object derived from the response returned from the `dataURL`.
    `void` | `updateCaches(DSResponse dsResponse)` Causes any components using this DataSource to be notified of changes that have been made to the remote dataset accessed via this DataSource, as though the provided DSResponse had just successfully completed.
    `void` | `updateCaches(DSResponse dsResponse, DSRequest dsRequest)` Causes any components using this DataSource to be notified of changes that have been made to the remote dataset accessed via this DataSource, as though the provided DSResponse had just successfully completed.
    `void` | `updateData(Record updatedRecord)` Perform an "update" DataSource operation against this DataSource, to update values in an existing DataSource record.
    `void` | `updateData(Record updatedRecord, DSCallback callback)`
    `void` | `updateData(Record updatedRecord, DSCallback callback, DSRequest requestProperties)` Perform an "update" DataSource operation against this DataSource, to update values in an existing DataSource record.
    `protected boolean` | `useOfflineResponse(DSRequest dsRequest, DSResponse dsResponse)` Override point to allow application code to suppress use of a particular offline response.
    `void` | `validateData(Record values)` Contacts the server to run server-side validation on a DSRequest and either returns `errors` validation errors or a `status` code of 0.
    `void` | `validateData(Record values, DSCallback callback)`
    `void` | `validateData(Record values, DSCallback callback, DSRequest requestProperties)` Contacts the server to run server-side validation on a DSRequest and either returns `errors` validation errors or a `status` code of 0.
    `void` | `viewFile(Record data)` Display a file stored in a field of type:"binary" in a new browser window.
    `void` | `viewFile(Record data, java.lang.String fieldName)`
    `void` | `viewFile(Record data, java.lang.String fieldName, DSRequest requestProperties)` Display a file stored in a field of type:"binary" in a new browser window.
    `java.lang.String` | `xmlSerialize(com.google.gwt.core.client.JavaScriptObject data)` Serialize a JavaScript object as XML.
    `java.lang.String` | `xmlSerialize(com.google.gwt.core.client.JavaScriptObject data, SerializationContext flags)` Serialize a JavaScript object as XML.
    `java.lang.String` | `xmlSerialize(java.util.Map data, SerializationContext flags)` Serialize a JavaScript object as XML.
    `java.lang.String` | `xmlSerialize(Record[] data, SerializationContext flags)` Serialize a JavaScript object as XML.
    `java.lang.String` | `xmlSerialize(Record data, SerializationContext flags)` Serialize a JavaScript object as XML.

    - ### Methods inherited from class com.smartgwt.client.core.BaseClass

      `asSGWTComponent, destroy, doAddHandler, doInit, error, error, errorIfNotCreated, fireEvent, getAttribute, getAttributeAsBoolean, getAttributeAsDate, getAttributeAsDouble, getAttributeAsElement, getAttributeAsFloat, getAttributeAsInt, getAttributeAsJavaScriptObject, getAttributeAsMap, getAttributeAsString, getAttributeAsStringArray, getClassName, getConfig, getHandlerCount, getID, getOrCreateJsObj, getRef, getScClassName, internalSetID, internalSetID, onBind, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setProperty, setProperty, setProperty, setProperty, setScClassName`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface com.google.gwt.event.shared.HasHandlers

      `fireEvent`

- - ### Constructor Detail

    - #### DataSource

          public DataSource()

    - #### DataSource

          public DataSource(com.google.gwt.core.client.JavaScriptObject jsObj)

    - #### DataSource

          public DataSource(java.lang.String dataURL)

  - ### Method Detail

    - #### getOrCreateRef

          public static DataSource getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)

    - #### setJavaScriptObject

          public void setJavaScriptObject(com.google.gwt.core.client.JavaScriptObject jsObj)

    - #### create

          public com.google.gwt.core.client.JavaScriptObject create()

      Specified by:
        `create` in class `BaseClass`

    - #### setAllowAdvancedCriteria

          public void setAllowAdvancedCriteria(java.lang.Boolean allowAdvancedCriteria)

      By default, all DataSources are assumed to be capable of handling `AdvancedCriteria` on fetch or filter type operations. This property may be set to `false` to indicate that this dataSource does not support advancedCriteria. See `DataSource.supportsAdvancedCriteria` for further information on this.

      NOTE: If you specify this property in a DataSource descriptor (`.ds.xml` file), it is enforced on the server. This means that if you run a request containing AdvancedCriteria against a DataSource that advertises itself as `allowAdvancedCriteria:false`, it will be rejected.

      Note : This is an advanced setting

      Parameters:
        `allowAdvancedCriteria` - allowAdvancedCriteria Default value is null
      See Also:
        `OperationBinding.setAllowAdvancedCriteria(java.lang.Boolean)`

    - #### getAllowAdvancedCriteria

          public java.lang.Boolean getAllowAdvancedCriteria()

      By default, all DataSources are assumed to be capable of handling `AdvancedCriteria` on fetch or filter type operations. This property may be set to `false` to indicate that this dataSource does not support advancedCriteria. See `DataSource.supportsAdvancedCriteria` for further information on this.

      NOTE: If you specify this property in a DataSource descriptor (`.ds.xml` file), it is enforced on the server. This means that if you run a request containing AdvancedCriteria against a DataSource that advertises itself as `allowAdvancedCriteria:false`, it will be rejected.

      Returns:
        Boolean
      See Also:
        `OperationBinding.getAllowAdvancedCriteria()`

    - #### setAutoCacheAllData

          public void setAutoCacheAllData(java.lang.Boolean autoCacheAllData)

      When a DataSource is not `cacheAllData`:true and a fetch results in the entire dataset being retrieved, this attribute being set to true causes the DataSource to automatically switch to `cacheAllData:true` and prevent further server-trips for fetch requests.

      `cacheAllData` is automatically enabled in either of these conditions:

      - The request has no criteria and no startRow/endRow request properties. The latter can be accomplished by disabling paging with a `dataFetchMode` setting of "basic" or "local" or by an explicit fetchData request with those request properties excluded.
      - The request has no criteria but has startRow/endRow specified and the response received has all data available (`startRow:0` and `endRow:totalRows`).
      Parameters:
        `autoCacheAllData` - autoCacheAllData Default value is false

    - #### getAutoCacheAllData

          public java.lang.Boolean getAutoCacheAllData()

      When a DataSource is not `cacheAllData`:true and a fetch results in the entire dataset being retrieved, this attribute being set to true causes the DataSource to automatically switch to `cacheAllData:true` and prevent further server-trips for fetch requests.

      `cacheAllData` is automatically enabled in either of these conditions:

      - The request has no criteria and no startRow/endRow request properties. The latter can be accomplished by disabling paging with a `dataFetchMode` setting of "basic" or "local" or by an explicit fetchData request with those request properties excluded.
      - The request has no criteria but has startRow/endRow specified and the response received has all data available (`startRow:0` and `endRow:totalRows`).
      Returns:
        Boolean

    - #### setAutoConvertRelativeDates

          public void setAutoConvertRelativeDates(java.lang.Boolean autoConvertRelativeDates)
                                           throws java.lang.IllegalStateException

      Whether to convert relative date values to concrete date values before sending to the server. Default value is true, which means that the server does not need to understand how to filter using relative dates - it receives all date values as absolute dates.
      Parameters:
        `autoConvertRelativeDates` - autoConvertRelativeDates Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getAutoConvertRelativeDates

          public java.lang.Boolean getAutoConvertRelativeDates()

      Whether to convert relative date values to concrete date values before sending to the server. Default value is true, which means that the server does not need to understand how to filter using relative dates - it receives all date values as absolute dates.
      Returns:
        Boolean

    - #### setAutoDeriveTitles

          public void setAutoDeriveTitles(boolean autoDeriveTitles)
                                   throws java.lang.IllegalStateException

      If set, titles are automatically derived from `field.name` for any field that does not have a `field.title` and is not marked `hidden`:true, by calling the method `DataSource.getAutoTitle`.
      Parameters:
        `autoDeriveTitles` - autoDeriveTitles Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getAutoDeriveTitles

          public boolean getAutoDeriveTitles()

      If set, titles are automatically derived from `field.name` for any field that does not have a `field.title` and is not marked `hidden`:true, by calling the method `DataSource.getAutoTitle`.
      Returns:
        boolean

    - #### setCacheAcrossOperationIds

          public void setCacheAcrossOperationIds(java.lang.Boolean cacheAcrossOperationIds)
                                          throws java.lang.IllegalStateException

      When `cacheAllData` mode is enabled and a `cacheAllOperationId` has been set, this flag affects whether cached results are used for all "fetch" requests regardless of their `operationId`, or are used only for "fetch" requests that use the `cacheAllOperationId`, allowing other requests to go to server normally.

      Default of `true` means that the `cacheAllOperationId` will be used to fetch all rows, but the resulting cache will be used for all "fetch" operations regardless of the `operationId` specified on the request.

      Switching to "false" effectively creates caching just for one specific `operationId` - the `cacheAllOperationId` - while allowing all other requests to go to the server normally.

      Parameters:
        `cacheAcrossOperationIds` - cacheAcrossOperationIds Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getCacheAcrossOperationIds

          public java.lang.Boolean getCacheAcrossOperationIds()

      When `cacheAllData` mode is enabled and a `cacheAllOperationId` has been set, this flag affects whether cached results are used for all "fetch" requests regardless of their `operationId`, or are used only for "fetch" requests that use the `cacheAllOperationId`, allowing other requests to go to server normally.

      Default of `true` means that the `cacheAllOperationId` will be used to fetch all rows, but the resulting cache will be used for all "fetch" operations regardless of the `operationId` specified on the request.

      Switching to "false" effectively creates caching just for one specific `operationId` - the `cacheAllOperationId` - while allowing all other requests to go to the server normally.

      Returns:
        Boolean

    - #### setCacheAllData

          public void setCacheAllData(java.lang.Boolean cacheAllData)

      Set this property to true to have a DataSource fetch all of its data client-side on the first fetch request. However, unlike a `clientOnly` DataSource, this DataSource will still save changes normally, sending remote requests.

      You can manually set this attribute after initialization by calling `DataSource.setCacheAllData`; setting `autoCacheAllData`:true causes a DataSource to automatically switch to `cacheAllData:true` when a fetch results in the entire dataset being brought client-side.

      To cause automatic cache updates, you can set `cacheMaxAge` to a number of seconds and once data has been client-side for that length of time, the next fetch causes the cache to be dropped and a new cache retrieved.

      Note that multiple `operationBindings` of type "fetch" which return distinct results will not work with `cacheAllData`: only one cache is created and is used for all fetch operations, regardless of whether `operationId` has been set. However, "fetch" operationBindings used as a `cacheSyncOperation` will work normally, so long as they return all data fields that are returned by the default "fetch" operation, so that the cache can be updated.

      To specify which operationId to use for fetching all data, use `cacheAllOperationId`.

      To use the cache only for requests that have the `cacheAllOperationId`, allowing any other operationId (or absence of an operationId) to contact the server as normal, set `cacheAllOperationIds`.
      If this method is called after the component has been drawn/initialized: Call this method to switch cacheAllData on or off after initialization. Passing a `shouldCache` value of false clears any existing client-side cache, cancels any outstanding requests for a full cache and issues any other pending requests normally.

      Parameters:
        `cacheAllData` - New value for `cacheAllData`. Default value is null

    - #### getCacheAllData

          public java.lang.Boolean getCacheAllData()

      Set this property to true to have a DataSource fetch all of its data client-side on the first fetch request. However, unlike a `clientOnly` DataSource, this DataSource will still save changes normally, sending remote requests.

      You can manually set this attribute after initialization by calling `DataSource.setCacheAllData`; setting `autoCacheAllData`:true causes a DataSource to automatically switch to `cacheAllData:true` when a fetch results in the entire dataset being brought client-side.

      To cause automatic cache updates, you can set `cacheMaxAge` to a number of seconds and once data has been client-side for that length of time, the next fetch causes the cache to be dropped and a new cache retrieved.

      Note that multiple `operationBindings` of type "fetch" which return distinct results will not work with `cacheAllData`: only one cache is created and is used for all fetch operations, regardless of whether `operationId` has been set. However, "fetch" operationBindings used as a `cacheSyncOperation` will work normally, so long as they return all data fields that are returned by the default "fetch" operation, so that the cache can be updated.

      To specify which operationId to use for fetching all data, use `cacheAllOperationId`.

      To use the cache only for requests that have the `cacheAllOperationId`, allowing any other operationId (or absence of an operationId) to contact the server as normal, set `cacheAllOperationIds`.

      Returns:
        Boolean

    - #### setCacheAllOperationId

          public void setCacheAllOperationId(java.lang.String cacheAllOperationId)
                                      throws java.lang.IllegalStateException

      `operationId` to use for fetching data in case `cacheAllData` is true. By default a standard fetch operation is used (with no `operationId` specified).
      Parameters:
        `cacheAllOperationId` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getCacheAllOperationId

          public java.lang.String getCacheAllOperationId()

      `operationId` to use for fetching data in case `cacheAllData` is true. By default a standard fetch operation is used (with no `operationId` specified).
      Returns:
        . See `String`

    - #### setCacheMaxAge

          public void setCacheMaxAge(int cacheMaxAge)

      The maximum time, in seconds, to maintain the client-side cache. If a fetch occurs after the cacheMaxAge has expired, the current cache will be dropped and another complete cache fetched.
      Parameters:
        `cacheMaxAge` - cacheMaxAge Default value is 60

    - #### getCacheMaxAge

          public int getCacheMaxAge()

      The maximum time, in seconds, to maintain the client-side cache. If a fetch occurs after the cacheMaxAge has expired, the current cache will be dropped and another complete cache fetched.
      Returns:
        int

    - #### setCallbackParam

          public void setCallbackParam(java.lang.String callbackParam)
                                throws java.lang.IllegalStateException

      Applies only to dataFormat: "json" and `dataTransport`:"scriptInclude". Specifies the name of the query parameter that tells your JSON service what function to call as part of the response.
      Parameters:
        `callbackParam` - . See `String`. Default value is "callback"
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `setDataFormat(com.smartgwt.client.types.DSDataFormat)`, `setOperationBindings(com.smartgwt.client.data.OperationBinding...)`, `OperationBinding.setCallbackParam(java.lang.String)`, `ClientDataIntegration overview and related methods`, Edit and Save Example

    - #### getCallbackParam

          public java.lang.String getCallbackParam()

      Applies only to dataFormat: "json" and `dataTransport`:"scriptInclude". Specifies the name of the query parameter that tells your JSON service what function to call as part of the response.
      Returns:
        . See `String`
      See Also:
        `getDataFormat()`, `getOperationBindings()`, `OperationBinding.getCallbackParam()`, `ClientDataIntegration overview and related methods`, Edit and Save Example

    - #### setCanMultiSort

          public void setCanMultiSort(boolean canMultiSort)
                               throws java.lang.IllegalStateException

      When true, indicates that this DataSource supports multi-level sorting.
      Parameters:
        `canMultiSort` - canMultiSort Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getCanMultiSort

          public boolean getCanMultiSort()

      When true, indicates that this DataSource supports multi-level sorting.
      Returns:
        boolean

    - #### setChildrenField

          public void setChildrenField(java.lang.String childrenField)
                                throws java.lang.IllegalStateException

      fieldName for a field in the dataSource expected to contain an explicit array of child nodes. Enables loading a databound tree as a hierarchical data structure, rather than a flat list of nodes linked by foreignKey.
      Note this is an alternative to setting `childrenProperty` directly on the childrenField object.

      By default the children field will be assumed to be `multiple`, for XML databinding. This implies that child data should be delivered in the format:

                 <childrenFieldName>
                     <item name="firstChild" ...>
                     <item name="secondChild" ...>
                 </childrenFieldName>

      However data may also be delivered as a direct list of `childrenFieldName` elements:

                 <childrenFieldName name="firstChild" ...>
                 <childrenFieldName name="secondChild" ...>

      If you want to return your data in this format, you will need to explicitly set `multiple` to false in the appropriate dataSource field definition.
      Parameters:
        `childrenField` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `DataSourceField.setChildrenProperty(java.lang.Boolean)`, `DataSourceRelations overview and related methods`

    - #### getChildrenField

          public java.lang.String getChildrenField()

      fieldName for a field in the dataSource expected to contain an explicit array of child nodes. Enables loading a databound tree as a hierarchical data structure, rather than a flat list of nodes linked by foreignKey.
      Note this is an alternative to setting `childrenProperty` directly on the childrenField object.

      By default the children field will be assumed to be `multiple`, for XML databinding. This implies that child data should be delivered in the format:

                 <childrenFieldName>
                     <item name="firstChild" ...>
                     <item name="secondChild" ...>
                 </childrenFieldName>

      However data may also be delivered as a direct list of `childrenFieldName` elements:

                 <childrenFieldName name="firstChild" ...>
                 <childrenFieldName name="secondChild" ...>

      If you want to return your data in this format, you will need to explicitly set `multiple` to false in the appropriate dataSource field definition.
      Returns:
        . See `String`
      See Also:
        `DataSourceField.getChildrenProperty()`, `DataSourceRelations overview and related methods`

    - #### setClientOnly

          public void setClientOnly(java.lang.Boolean clientOnly)
                             throws java.lang.IllegalStateException

      A clientOnly DataSource simulates the behavior of a remote data store by manipulating a static dataset in memory as `DSRequests` are executed on it. Any changes are lost when the user reloads the page or navigates away.

      A clientOnly DataSource will return responses asynchronously, just as a DataSource accessing remote data does. This allows a clientOnly DataSource to be used as a temporary placeholder while a real DataSource is being implemented - if a clientOnly DataSource is replaced by a DataSource that accesses a remote data store, UI code for components that used the clientOnly DataSource will not need be changed.

      A clientOnly DataSource can also be used as a shared cache of modifiable data across multiple UI components when immediate saving is not desirable. In this case, several components may interact with a clientOnly DataSource and get the benefit of `ResultSet` behaviors such as automatic cache sync and in-browser data filtering and sorting. When it's finally time to save, `cacheData` can be inspected for changes and data can be saved to the original DataSource via `DataSource.addData`, `DataSource.updateData` and `DataSource.removeData`, possibly in a `transactional queue`. Note that `DataSource.getClientOnlyDataSource` lets you easily obtain a `clientOnly` DataSource representing a subset of the data available from a normal DataSource.

      See also `cacheAllData` - a `cacheAllData` behaves like a write-through cache, performing fetch and filter operations locally while still performing remote save operations immediately.

      ClientOnly DataSources can be populated programmatically via `cacheData` - see `this discussion` for other ways to populate a client-only DataSource with data.
      If this method is called after the component has been drawn/initialized: Switch into clientOnly mode, taking the cache from the cacheAllData ResultSet if it exists.

      Parameters:
        `clientOnly` - clientOnly Default value is false
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `ClientOnlyDataSources overview and related methods`, Local DataSource Example

    - #### getClientOnly

          public java.lang.Boolean getClientOnly()

      A clientOnly DataSource simulates the behavior of a remote data store by manipulating a static dataset in memory as `DSRequests` are executed on it. Any changes are lost when the user reloads the page or navigates away.

      A clientOnly DataSource will return responses asynchronously, just as a DataSource accessing remote data does. This allows a clientOnly DataSource to be used as a temporary placeholder while a real DataSource is being implemented - if a clientOnly DataSource is replaced by a DataSource that accesses a remote data store, UI code for components that used the clientOnly DataSource will not need be changed.

      A clientOnly DataSource can also be used as a shared cache of modifiable data across multiple UI components when immediate saving is not desirable. In this case, several components may interact with a clientOnly DataSource and get the benefit of `ResultSet` behaviors such as automatic cache sync and in-browser data filtering and sorting. When it's finally time to save, `cacheData` can be inspected for changes and data can be saved to the original DataSource via `DataSource.addData`, `DataSource.updateData` and `DataSource.removeData`, possibly in a `transactional queue`. Note that `DataSource.getClientOnlyDataSource` lets you easily obtain a `clientOnly` DataSource representing a subset of the data available from a normal DataSource.

      See also `cacheAllData` - a `cacheAllData` behaves like a write-through cache, performing fetch and filter operations locally while still performing remote save operations immediately.

      ClientOnly DataSources can be populated programmatically via `cacheData` - see `this discussion` for other ways to populate a client-only DataSource with data.

      Returns:
        Boolean
      See Also:
        `ClientOnlyDataSources overview and related methods`, Local DataSource Example

    - #### setCriteriaPolicy

          public void setCriteriaPolicy(CriteriaPolicy criteriaPolicy)

      Decides under what conditions the `ResultSet` cache should be dropped when the `criteria` changes.

      Note : This is an advanced setting

      Parameters:
        `criteriaPolicy` - criteriaPolicy Default value is "dropOnShortening"
      See Also:
        `compareCriteria(com.smartgwt.client.data.Criteria, com.smartgwt.client.data.Criteria)`

    - #### getCriteriaPolicy

          public CriteriaPolicy getCriteriaPolicy()

      Decides under what conditions the `ResultSet` cache should be dropped when the `criteria` changes.
      Returns:
        CriteriaPolicy
      See Also:
        `compareCriteria(com.smartgwt.client.data.Criteria, com.smartgwt.client.data.Criteria)`

    - #### setDataField

          public void setDataField(java.lang.String dataField)
                            throws java.lang.IllegalStateException

      Name of the field that has the most pertinent numeric, date, or enum value, for use when a `DataBoundComponent` needs to show a short summary of a record.

      For example, for a DataSource of employees, good choices might be the "salary" field, "hire date" or "status" (active, vacation, on leave, etc).

      Unlike `titleField`, dataField is not automatically determined in the absence of an explicit setting.

      Parameters:
        `dataField` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `DsSpecialFields overview and related methods`

    - #### getDataField

          public java.lang.String getDataField()

      Name of the field that has the most pertinent numeric, date, or enum value, for use when a `DataBoundComponent` needs to show a short summary of a record.

      For example, for a DataSource of employees, good choices might be the "salary" field, "hire date" or "status" (active, vacation, on leave, etc).

      Unlike `titleField`, dataField is not automatically determined in the absence of an explicit setting.

      Returns:
        . See `String`
      See Also:
        `DsSpecialFields overview and related methods`

    - #### setDataFormat

          public void setDataFormat(DSDataFormat dataFormat)
                             throws java.lang.IllegalStateException

      Indicates the format to be used for HTTP requests and responses when fulfilling DSRequests (eg, when `DataSource.fetchData` is called).
      Parameters:
        `dataFormat` - dataFormat Default value is "iscServer"
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `ClientDataIntegration overview and related methods`, JSON DataSource Example, Simple JSON Example

    - #### getDataFormat

          public DSDataFormat getDataFormat()

      Indicates the format to be used for HTTP requests and responses when fulfilling DSRequests (eg, when `DataSource.fetchData` is called).
      Returns:
        DSDataFormat
      See Also:
        `ClientDataIntegration overview and related methods`, JSON DataSource Example, Simple JSON Example

    - #### setDataTransport

          public void setDataTransport(RPCTransport dataTransport)
                                throws java.lang.IllegalStateException

      Transport to use for all operations on this DataSource. Defaults to `defaultTransport`. This would typically only be set to enable "scriptInclude" transport for contacting `JSON` web services hosted on servers other than the origin server.

      When using the "scriptInclude" transport, be sure to set `callbackParam` or `callbackParam` to match the name of the query parameter name expected by your JSON service provider.

      Parameters:
        `dataTransport` - dataTransport Default value is RPCManager.defaultTransport
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `RPCTransport`, `setCallbackParam(java.lang.String)`, `ClientDataIntegration overview and related methods`

    - #### getDataTransport

          public RPCTransport getDataTransport()

      Transport to use for all operations on this DataSource. Defaults to `defaultTransport`. This would typically only be set to enable "scriptInclude" transport for contacting `JSON` web services hosted on servers other than the origin server.

      When using the "scriptInclude" transport, be sure to set `callbackParam` or `callbackParam` to match the name of the query parameter name expected by your JSON service provider.

      Returns:
        RPCTransport
      See Also:
        `RPCTransport`, `getCallbackParam()`, `ClientDataIntegration overview and related methods`

    - #### setDataURL

          public void setDataURL(java.lang.String dataURL)
                          throws java.lang.IllegalStateException

      Default URL to contact to fulfill all DSRequests. Can also be set on a per-operationType basis via `dataURL`.

      NOTE: Best practice is to use the same `dataURL` for all DataSources which fulfill DSRequests via the server-side RPCManager API. Otherwise, cross-DataSource `operation queuing` will not be possible.

      Parameters:
        `dataURL` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `ClientDataIntegration overview and related methods`, JSON DataSource Example

    - #### getDataURL

          public java.lang.String getDataURL()

      Default URL to contact to fulfill all DSRequests. Can also be set on a per-operationType basis via `dataURL`.

      NOTE: Best practice is to use the same `dataURL` for all DataSources which fulfill DSRequests via the server-side RPCManager API. Otherwise, cross-DataSource `operation queuing` will not be possible.

      Returns:
        . See `String`
      See Also:
        `ClientDataIntegration overview and related methods`, JSON DataSource Example

    - #### setDescriptionField

          public void setDescriptionField(java.lang.String descriptionField)
                                   throws java.lang.IllegalStateException

      Name of the field that has a long description of the record, or has the primary text data value for a record that represents an email message, SMS, log or similar.

      For example, for a DataSource representing employees, a field containing the employee's "bio" might be a good choice, or for an email message, the message body.

      If descriptionField is unset, it defaults to any field named "description" or "desc" in the record, or the first long text field (greater than 255 characters) in the record, or null if no such field exists.

      Parameters:
        `descriptionField` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `DsSpecialFields overview and related methods`

    - #### getDescriptionField

          public java.lang.String getDescriptionField()

      Name of the field that has a long description of the record, or has the primary text data value for a record that represents an email message, SMS, log or similar.

      For example, for a DataSource representing employees, a field containing the employee's "bio" might be a good choice, or for an email message, the message body.

      If descriptionField is unset, it defaults to any field named "description" or "desc" in the record, or the first long text field (greater than 255 characters) in the record, or null if no such field exists.

      Returns:
        . See `String`
      See Also:
        `DsSpecialFields overview and related methods`

    - #### setDropExtraFields

          public void setDropExtraFields(java.lang.Boolean dropExtraFields)
                                  throws java.lang.IllegalStateException

      Indicates that for server responses, for any data being interpreted as DataSource records, only data that corresponds to declared fields should be retained; any extra fields should be discarded.

      For `JSON` data, this means extra properties in selected objects are dropped.

      By default, for DMI DSResponses, DSResponse.data is filtered on the server to just the set of fields defined on the DataSource. This type of filtering can also be enabled for non-DMI DSResponses (see the overview in `DMI`). Setting this property to `false` disables this filtering for this DataSource only. This setting overrides the configuration in `server.properties`. This setting can be overridden by `dropExtraFields`.

      Parameters:
        `dropExtraFields` - dropExtraFields Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `ClientDataIntegration overview and related methods`

    - #### getDropExtraFields

          public java.lang.Boolean getDropExtraFields()

      Indicates that for server responses, for any data being interpreted as DataSource records, only data that corresponds to declared fields should be retained; any extra fields should be discarded.

      For `JSON` data, this means extra properties in selected objects are dropped.

      By default, for DMI DSResponses, DSResponse.data is filtered on the server to just the set of fields defined on the DataSource. This type of filtering can also be enabled for non-DMI DSResponses (see the overview in `DMI`). Setting this property to `false` disables this filtering for this DataSource only. This setting overrides the configuration in `server.properties`. This setting can be overridden by `dropExtraFields`.

      Returns:
        Boolean
      See Also:
        `ClientDataIntegration overview and related methods`

    - #### setDropUnknownCriteria

          public void setDropUnknownCriteria(java.lang.Boolean dropUnknownCriteria)
                                      throws java.lang.IllegalStateException

      If the criteria applied to a fetch type operation contain fields that are not present in the dataSource, should they be ignored when performing filtering on the client. This property is useful for cases where you custom server logic makes use of criteria values to determine what set of records to return to the client, but the data does not actually have record values for these fields and as such the client-side filtering logic should ignore them.
      Parameters:
        `dropUnknownCriteria` - dropUnknownCriteria Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getDropUnknownCriteria

          public java.lang.Boolean getDropUnknownCriteria()

      If the criteria applied to a fetch type operation contain fields that are not present in the dataSource, should they be ignored when performing filtering on the client. This property is useful for cases where you custom server logic makes use of criteria values to determine what set of records to return to the client, but the data does not actually have record values for these fields and as such the client-side filtering logic should ignore them.
      Returns:
        Boolean

    - #### setEnumConstantProperty

          public void setEnumConstantProperty(java.lang.String enumConstantProperty)
                                       throws java.lang.IllegalStateException

      The name of the property this DataSource uses for constant name when translating Java enumerated types to and from Javascript, if the `EnumTranslateStrategy` is set to "bean". Defaults to "_constant" if not set.

      This property is only applicable if you are using the Smart GWT server

      Note : This is an advanced setting

      Parameters:
        `enumConstantProperty` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### setEnumOrdinalProperty

          public void setEnumOrdinalProperty(java.lang.String enumOrdinalProperty)
                                      throws java.lang.IllegalStateException

      The name of the property this DataSource uses for ordinal number when translating Java enumerated types to and from Javascript, if the `EnumTranslateStrategy` is set to "bean". Defaults to "_ordinal" if not set.

      This property is only applicable if you are using the Smart GWT server

      Note : This is an advanced setting

      Parameters:
        `enumOrdinalProperty` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### setEnumTranslateStrategy

          public void setEnumTranslateStrategy(EnumTranslateStrategy enumTranslateStrategy)
                                        throws java.lang.IllegalStateException

      Sets the strategy this DataSource uses to translate Java enumerated types (objects of type enum) to and from Javascript. This property is only applicable if you are using the Smart GWT server

      Note : This is an advanced setting

      Parameters:
        `enumTranslateStrategy` - enumTranslateStrategy Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### setGlobalNamespaces

          public void setGlobalNamespaces(java.util.Map globalNamespaces)

      Namespaces definitions to add to the root element of outbound XML messages sent to a web service, as a mapping from namespace prefix to namespace URI.

      The default value is:

              globalNamespaces : {
                 xsi: "http://www.w3.org/2001/XMLSchema-instance",
                 xsd: "http://www.w3.org/2001/XMLSchema"
              },

      This default value allows the use of the xsi:type and xsi:nil attributes without further declarations.

      Note that some web services will only accept specific revisions of the XML Schema URI. If xsi-namespaced attributes seem to be ignored by an older webservice, try the URI "http://www.w3.org/1999/XMLSchema-instance" instead.

      Parameters:
        `globalNamespaces` - globalNamespaces Default value is ...

    - #### getGlobalNamespaces

          public java.util.Map getGlobalNamespaces()

      Namespaces definitions to add to the root element of outbound XML messages sent to a web service, as a mapping from namespace prefix to namespace URI.

      The default value is:

              globalNamespaces : {
                 xsi: "http://www.w3.org/2001/XMLSchema-instance",
                 xsd: "http://www.w3.org/2001/XMLSchema"
              },

      This default value allows the use of the xsi:type and xsi:nil attributes without further declarations.

      Note that some web services will only accept specific revisions of the XML Schema URI. If xsi-namespaced attributes seem to be ignored by an older webservice, try the URI "http://www.w3.org/1999/XMLSchema-instance" instead.

      Returns:
        Map

    - #### setIconField

          public void setIconField(java.lang.String iconField)
                            throws java.lang.IllegalStateException

      Designates a field of `type`:"image" as the field to use when rendering a record as an image, for example, in a `TileGrid`.

      For example, for a DataSource of employees, a "photo" field of type "image" should be designated as the iconField.

      If not explicitly set, iconField looks for fields named "picture", "thumbnail", "icon", "image" and "img", in that order, and will use any of these fields as the iconField if it exists and has type "image".

      To avoid any field being used as the iconField, set iconField to `null`.

      Parameters:
        `iconField` - . See `String`. Default value is see below
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `DsSpecialFields overview and related methods`

    - #### getIconField

          public java.lang.String getIconField()

      Designates a field of `type`:"image" as the field to use when rendering a record as an image, for example, in a `TileGrid`.

      For example, for a DataSource of employees, a "photo" field of type "image" should be designated as the iconField.

      If not explicitly set, iconField looks for fields named "picture", "thumbnail", "icon", "image" and "img", in that order, and will use any of these fields as the iconField if it exists and has type "image".

      To avoid any field being used as the iconField, set iconField to `null`.

      Returns:
        . See `String`
      See Also:
        `DsSpecialFields overview and related methods`

    - #### setInfoField

          public void setInfoField(java.lang.String infoField)
                            throws java.lang.IllegalStateException

      Name of the field that has the second most pertinent piece of textual information in the record, for use when a `DataBoundComponent` needs to show a short summary of a record.

      For example, for a DataSource of employees, a "job title" field would probably be the second most pertinent text field aside from the employee's "full name".

      Unlike `titleField`, infoField is not automatically determined in the absence of an explicit setting.

      Parameters:
        `infoField` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `DsSpecialFields overview and related methods`

    - #### getInfoField

          public java.lang.String getInfoField()

      Name of the field that has the second most pertinent piece of textual information in the record, for use when a `DataBoundComponent` needs to show a short summary of a record.

      For example, for a DataSource of employees, a "job title" field would probably be the second most pertinent text field aside from the employee's "full name".

      Unlike `titleField`, infoField is not automatically determined in the absence of an explicit setting.

      Returns:
        . See `String`
      See Also:
        `DsSpecialFields overview and related methods`

    - #### setInheritsFrom

          public void setInheritsFrom(java.lang.String inheritsFrom)
                               throws java.lang.IllegalStateException

      ID of another DataSource this DataSource inherits its `fields` from.

      Local fields (fields defined in this DataSource) are added to inherited fields to form the full set of fields. Fields with the same name are merged in the same way that `databound component fields` are merged with DataSource fields.

      The default order of the combined fields is new local fields first (including any fields present in the parent DataSource which the local DataSource re-declares), then parent fields. You can set `useParentFieldOrder` to instead use the parent's field order, with new local fields appearing last. You can set `showLocalFieldsOnly` to have all non-local fields hidden.

      Note that only fields are inherited - other properties such as dataURL and dataFormat are not. You can use ordinary inheritance, that is, creating a subclass of DataSource, in order to share properties such as dataURL across a series of DataSources that also inherit fields from each other via `inheritsFrom`.

      This feature can be used for:

      - creating a customized view (eg, only certain fields shown) which will be used by multiple `databound components`.
      - adding presentation-specific attributes to metadata that has been automatically derived from `XML Schema` or other metadata formats
      - modeling object subclassing and extension in server-side code and storage systems
      - modeling relational database joins, and the equivalents in other systems
      - creating hooks for others to customize your application in a maintainable way. For example, if you have a dataSource "employee", you can create a dataSource "customizedEmployee" which inherits from "employee" but does not initially define any fields, and bind all `databound components` to "customizedEmployee". Customizations of fields (including appearance changes, field order, new fields, hiding of fields, and custom validation rules) can be added to "customizedEmployee", so that they are kept separately from the original field data and have the best possible chance of working with future versions of the "employee" dataSource.
      Parameters:
        `inheritsFrom` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        Schema Chaining Example

    - #### getInheritsFrom

          public java.lang.String getInheritsFrom()

      ID of another DataSource this DataSource inherits its `fields` from.

      Local fields (fields defined in this DataSource) are added to inherited fields to form the full set of fields. Fields with the same name are merged in the same way that `databound component fields` are merged with DataSource fields.

      The default order of the combined fields is new local fields first (including any fields present in the parent DataSource which the local DataSource re-declares), then parent fields. You can set `useParentFieldOrder` to instead use the parent's field order, with new local fields appearing last. You can set `showLocalFieldsOnly` to have all non-local fields hidden.

      Note that only fields are inherited - other properties such as dataURL and dataFormat are not. You can use ordinary inheritance, that is, creating a subclass of DataSource, in order to share properties such as dataURL across a series of DataSources that also inherit fields from each other via `inheritsFrom`.

      This feature can be used for:

      - creating a customized view (eg, only certain fields shown) which will be used by multiple `databound components`.
      - adding presentation-specific attributes to metadata that has been automatically derived from `XML Schema` or other metadata formats
      - modeling object subclassing and extension in server-side code and storage systems
      - modeling relational database joins, and the equivalents in other systems
      - creating hooks for others to customize your application in a maintainable way. For example, if you have a dataSource "employee", you can create a dataSource "customizedEmployee" which inherits from "employee" but does not initially define any fields, and bind all `databound components` to "customizedEmployee". Customizations of fields (including appearance changes, field order, new fields, hiding of fields, and custom validation rules) can be added to "customizedEmployee", so that they are kept separately from the original field data and have the best possible chance of working with future versions of the "employee" dataSource.
      Returns:
        . See `String`
      See Also:
        Schema Chaining Example

    - #### setJsonPrefix

          public void setJsonPrefix(java.lang.String jsonPrefix)
                             throws java.lang.IllegalStateException

      Allows you to specify an arbitrary prefix string to apply to all json format responses sent from the server to this application.

      The inclusion of such a prefix ensures your code is not directly executable outside of your application, as a preventative measure against javascript hijacking.

      Only applies to responses formatted as json objects. Does not apply to responses returned via scriptInclude type transport.
      Note: If the prefix / suffix served by your backend is not a constant, you can use `dataFormat:"custom"` instead and explicitly parse the prefix out as part of `transformResponse()`.

      Note : This is an advanced setting

      Parameters:
        `jsonPrefix` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `OperationBinding.setDataFormat(com.smartgwt.client.types.DSDataFormat)`, `OperationBinding.setDataTransport(com.smartgwt.client.types.RPCTransport)`

    - #### getJsonPrefix

          public java.lang.String getJsonPrefix()

      Allows you to specify an arbitrary prefix string to apply to all json format responses sent from the server to this application.

      The inclusion of such a prefix ensures your code is not directly executable outside of your application, as a preventative measure against javascript hijacking.

      Only applies to responses formatted as json objects. Does not apply to responses returned via scriptInclude type transport.
      Note: If the prefix / suffix served by your backend is not a constant, you can use `dataFormat:"custom"` instead and explicitly parse the prefix out as part of `transformResponse()`.

      Returns:
        . See `String`
      See Also:
        `OperationBinding.getDataFormat()`, `OperationBinding.getDataTransport()`

    - #### setJsonSuffix

          public void setJsonSuffix(java.lang.String jsonSuffix)
                             throws java.lang.IllegalStateException

      Allows you to specify an arbitrary suffix string to apply to all json format responses sent from the server to this application.

      The inclusion of such a suffix ensures your code is not directly executable outside of your application, as a preventative measure against javascript hijacking.

      Only applies to responses formatted as json objects. Does not apply to responses returned via scriptInclude type transport.

      Note : This is an advanced setting

      Parameters:
        `jsonSuffix` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `OperationBinding.setDataFormat(com.smartgwt.client.types.DSDataFormat)`, `OperationBinding.setDataTransport(com.smartgwt.client.types.RPCTransport)`

    - #### getJsonSuffix

          public java.lang.String getJsonSuffix()

      Allows you to specify an arbitrary suffix string to apply to all json format responses sent from the server to this application.

      The inclusion of such a suffix ensures your code is not directly executable outside of your application, as a preventative measure against javascript hijacking.

      Only applies to responses formatted as json objects. Does not apply to responses returned via scriptInclude type transport.

      Returns:
        . See `String`
      See Also:
        `OperationBinding.getDataFormat()`, `OperationBinding.getDataTransport()`

    - #### setOperationBindings

          public void setOperationBindings(OperationBinding... operationBindings)
                                    throws java.lang.IllegalStateException

      Optional array of OperationBindings, which provide instructions to the DataSource about how each DSOperation is to be performed.

      When using the Smart GWT Server, OperationBindings are specified in your DataSource descriptor (.ds.xml file) and control server-side behavior such as what Java object to route DSRequest to (`serverObject`) or customizations to SQL / HQL queries (`customSQL` and `customHQL`). See the

      Parameters:
        `operationBindings` - operationBindings Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        Java Integration samples.

        For DataSources bound to WSDL-described web services using {@link com.smartgwt.client.data.DataSource#getServiceNamespace serviceNamespace}, OperationBindings are used to bind each DataSource {@link com.smartgwt.client.data.OperationBinding#getOperationType operationType} to an {@link com.smartgwt.client.data.OperationBinding#getWsOperation operation} of a WSDL-described {@link com.smartgwt.client.data.WebService web service}, so that a DataSource can both fetch and save data to a web service.

        For example, this code accomplishes part of the binding to the SalesForce partner web services

              isc.DataSource.create({
                 serviceNamespace : "urn:partner.soap.sforce.com",
                 operationBindings : [
                     { operationType:"fetch", wsOperation:"query", recordName: "sObject" },
                     { operationType:"update", wsOperation:"update", recordName: "SaveResult" },
                     { operationType:"add", wsOperation:"create", recordName: "SaveResult" },
                     { operationType:"remove", wsOperation:"delete", recordName: "DeleteResult" }
                 ],
                 ...
              });

        NOTE: additional code is required to handle authentication and other details, see the complete code in smartclientSDK/examples/databinding/SalesForce.

        For DataSources that contact non-WSDL-described XML or JSON services, OperationBindings can be used to separately configure the URL, HTTP method, input and output processing for each operationType. This makes it possible to fetch JSON data from one URL for the "fetch" operationType and save to a web service for the "update" operationType, while appearing as a single integrated DataSource to a {@link com.smartgwt.client.widgets.DataBoundComponent} such as an {@link com.smartgwt.client.widgets.grid.ListGrid#getCanEdit editable ListGrid}.

        If no operationBinding is defined for a given DataSource operation, all of the properties which are valid on the operationBinding are checked for on the DataSource itself.

        This also means that for a read-only DataSource, that is, a DataSource only capable of fetch operations, operationBindings need not be specified, and instead all operationBinding properties can be set on the DataSource itself. An example of using OperationBinding properties directly on the DataSource in order to read an RSS feed can be found here:

        ${isc.DocUtils.linkForStandaloneExample('/examples/databinding/rss_databinding.html', '/examples/databinding/rss_databinding.html')}, `OperationBinding`

    - #### getOperationBindings

          public OperationBinding[] getOperationBindings()

      Optional array of OperationBindings, which provide instructions to the DataSource about how each DSOperation is to be performed.

      When using the Smart GWT Server, OperationBindings are specified in your DataSource descriptor (.ds.xml file) and control server-side behavior such as what Java object to route DSRequest to (`serverObject`) or customizations to SQL / HQL queries (`customSQL` and `customHQL`). See the

      Returns:
        OperationBinding
      See Also:
        Java Integration samples.

        For DataSources bound to WSDL-described web services using {@link com.smartgwt.client.data.DataSource#getServiceNamespace serviceNamespace}, OperationBindings are used to bind each DataSource {@link com.smartgwt.client.data.OperationBinding#getOperationType operationType} to an {@link com.smartgwt.client.data.OperationBinding#getWsOperation operation} of a WSDL-described {@link com.smartgwt.client.data.WebService web service}, so that a DataSource can both fetch and save data to a web service.

        For example, this code accomplishes part of the binding to the SalesForce partner web services

              isc.DataSource.create({
                 serviceNamespace : "urn:partner.soap.sforce.com",
                 operationBindings : [
                     { operationType:"fetch", wsOperation:"query", recordName: "sObject" },
                     { operationType:"update", wsOperation:"update", recordName: "SaveResult" },
                     { operationType:"add", wsOperation:"create", recordName: "SaveResult" },
                     { operationType:"remove", wsOperation:"delete", recordName: "DeleteResult" }
                 ],
                 ...
              });

        NOTE: additional code is required to handle authentication and other details, see the complete code in smartclientSDK/examples/databinding/SalesForce.

        For DataSources that contact non-WSDL-described XML or JSON services, OperationBindings can be used to separately configure the URL, HTTP method, input and output processing for each operationType. This makes it possible to fetch JSON data from one URL for the "fetch" operationType and save to a web service for the "update" operationType, while appearing as a single integrated DataSource to a {@link com.smartgwt.client.widgets.DataBoundComponent} such as an {@link com.smartgwt.client.widgets.grid.ListGrid#getCanEdit editable ListGrid}.

        If no operationBinding is defined for a given DataSource operation, all of the properties which are valid on the operationBinding are checked for on the DataSource itself.

        This also means that for a read-only DataSource, that is, a DataSource only capable of fetch operations, operationBindings need not be specified, and instead all operationBinding properties can be set on the DataSource itself. An example of using OperationBinding properties directly on the DataSource in order to read an RSS feed can be found here:

        ${isc.DocUtils.linkForStandaloneExample('/examples/databinding/rss_databinding.html', '/examples/databinding/rss_databinding.html')}, `OperationBinding`

    - #### setPluralTitle

          public void setPluralTitle(java.lang.String pluralTitle)
                              throws java.lang.IllegalStateException

      User-visible plural name for this DataSource.

      For example, for the supplyItem DataSource, "Supply Items".

      Defaults to (`dataSource.title` or `dataSource.ID`) + "s".

      Parameters:
        `pluralTitle` - . See `String`. Default value is dataSource.ID
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getPluralTitle

          public java.lang.String getPluralTitle()

      User-visible plural name for this DataSource.

      For example, for the supplyItem DataSource, "Supply Items".

      Defaults to (`dataSource.title` or `dataSource.ID`) + "s".

      Returns:
        . See `String`

    - #### setPreventHTTPCaching

          public void setPreventHTTPCaching(java.lang.Boolean preventHTTPCaching)
                                     throws java.lang.IllegalStateException

      If set, the DataSource will ensure that it never uses a cached HTTP response, even if the server marks the response as cacheable.

      Note that this does not disable caching at higher levels in the framework, for example, the caching performed by `ResultSet`.

      Parameters:
        `preventHTTPCaching` - preventHTTPCaching Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getPreventHTTPCaching

          public java.lang.Boolean getPreventHTTPCaching()

      If set, the DataSource will ensure that it never uses a cached HTTP response, even if the server marks the response as cacheable.

      Note that this does not disable caching at higher levels in the framework, for example, the caching performed by `ResultSet`.

      Returns:
        Boolean

    - #### setProgressiveLoading

          public void setProgressiveLoading(java.lang.Boolean progressiveLoading)

      If true, causes Smart GWT Server to use the "progressive loading" pattern for fetches on this dataSource, as described in the Paging and total dataset length section of the `ResultSet documentation`. Essentially, this means that we avoid issuing a row count query and instead advertise total rows as being slightly more than the number of rows we have already read (see `endGap`). This allows users to load more of a dataset by scrolling past the end of the currently-loaded rows, but it prevents them from scrolling directly to the end of the dataset.

      Generally, progressive loading is appropriate when you have to deal with very large datasets. Note that by default, a dataSource will switch into progressive loading mode automatically when it detects that it is dealing with a dataset beyond a certain size - see `progressiveLoadingThreshold`.

      This setting can be overridden for individual fetch operations with the `progressiveLoading` property, and also at the level of the individual `DSRequest`. You can also specify `progressiveLoading` on `DataBoundComponents` and certain types of `FormItem` - `SelectItem` and `ComboBoxItem`.

      Currently, this property only applies to users of the built-in SQLDataSource, but you could use it in custom DataSource implementations to trigger the server behavior described in the `ResultSet` documentation linked to above.

      Parameters:
        `progressiveLoading` - progressiveLoading Default value is null
      See Also:
        `com.smartgwt.client.docs.serverds.OperationBinding#progressiveLoading`, `com.smartgwt.client.docs.serverds.DataSource#progressiveLoadingThreshold`, `com.smartgwt.client.docs.serverds.DataSource#lookAhead`, `com.smartgwt.client.docs.serverds.DataSource#endGap`, `ProgressiveLoading overview and related methods`

    - #### getProgressiveLoading

          public java.lang.Boolean getProgressiveLoading()

      If true, causes Smart GWT Server to use the "progressive loading" pattern for fetches on this dataSource, as described in the Paging and total dataset length section of the `ResultSet documentation`. Essentially, this means that we avoid issuing a row count query and instead advertise total rows as being slightly more than the number of rows we have already read (see `endGap`). This allows users to load more of a dataset by scrolling past the end of the currently-loaded rows, but it prevents them from scrolling directly to the end of the dataset.

      Generally, progressive loading is appropriate when you have to deal with very large datasets. Note that by default, a dataSource will switch into progressive loading mode automatically when it detects that it is dealing with a dataset beyond a certain size - see `progressiveLoadingThreshold`.

      This setting can be overridden for individual fetch operations with the `progressiveLoading` property, and also at the level of the individual `DSRequest`. You can also specify `progressiveLoading` on `DataBoundComponents` and certain types of `FormItem` - `SelectItem` and `ComboBoxItem`.

      Currently, this property only applies to users of the built-in SQLDataSource, but you could use it in custom DataSource implementations to trigger the server behavior described in the `ResultSet` documentation linked to above.

      Returns:
        Boolean
      See Also:
        `com.smartgwt.client.docs.serverds.OperationBinding#progressiveLoading`, `com.smartgwt.client.docs.serverds.DataSource#progressiveLoadingThreshold`, `com.smartgwt.client.docs.serverds.DataSource#lookAhead`, `com.smartgwt.client.docs.serverds.DataSource#endGap`, `ProgressiveLoading overview and related methods`

    - #### setQualifyColumnNames

          public void setQualifyColumnNames(java.lang.Boolean qualifyColumnNames)
                                     throws java.lang.IllegalStateException

      For dataSources of `serverType` "sql", determines whether we qualify column names with table names in any SQL we generate. This property can be overridden on specific operationBindings.
      Parameters:
        `qualifyColumnNames` - qualifyColumnNames Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `com.smartgwt.client.docs.serverds.OperationBinding#qualifyColumnNames`

    - #### getQualifyColumnNames

          public java.lang.Boolean getQualifyColumnNames()

      For dataSources of `serverType` "sql", determines whether we qualify column names with table names in any SQL we generate. This property can be overridden on specific operationBindings.
      Returns:
        Boolean
      See Also:
        `com.smartgwt.client.docs.serverds.OperationBinding#qualifyColumnNames`

    - #### setRecordXPath

          public void setRecordXPath(java.lang.String recordXPath)
                              throws java.lang.IllegalStateException

      See `recordXPath`. `recordXPath` can be specified directly on the DataSource for a simple read-only DataSource only capable of "fetch" operations.
      Parameters:
        `recordXPath` - . See `XPathExpression`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `ClientDataIntegration overview and related methods`, XML DataSource Example, JSON XPath Binding Example

    - #### getRecordXPath

          public java.lang.String getRecordXPath()

      See `recordXPath`. `recordXPath` can be specified directly on the DataSource for a simple read-only DataSource only capable of "fetch" operations.
      Returns:
        . See `XPathExpression`
      See Also:
        `ClientDataIntegration overview and related methods`, XML DataSource Example, JSON XPath Binding Example

    - #### setRequestProperties

          public void setRequestProperties(DSRequest requestProperties)
                                    throws java.lang.IllegalStateException

      Additional properties to pass through to the `DSRequest`s made by this DataSource.

      These properties are applied before `DataSource.transformRequest` is called.

      Parameters:
        `requestProperties` - requestProperties Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `DSRequest`, `OperationBinding.setRequestProperties(com.smartgwt.client.data.DSRequest)`, `ClientDataIntegration overview and related methods`

    - #### getRequestProperties

          public DSRequest getRequestProperties()

      Additional properties to pass through to the `DSRequest`s made by this DataSource.

      These properties are applied before `DataSource.transformRequest` is called.

      Returns:
        DSRequest
      See Also:
        `DSRequest`, `OperationBinding.getRequestProperties()`, `ClientDataIntegration overview and related methods`

    - #### setRequiredMessage

          public void setRequiredMessage(java.lang.String requiredMessage)

      The required message when a field that has been marked as `required` is not filled in by the user.
      Parameters:
        `requiredMessage` - . See `String`. Default value is null
      See Also:
        `FormTitles overview and related methods`

    - #### getRequiredMessage

          public java.lang.String getRequiredMessage()

      The required message when a field that has been marked as `required` is not filled in by the user.
      Returns:
        . See `String`
      See Also:
        `FormTitles overview and related methods`

    - #### setResultBatchSize

          public void setResultBatchSize(int resultBatchSize)

      Very advanced: for servers that do not support paging, and must return large numbers of XML records in one HTTP response, Smart GWT breaks up the processing of the response in order to avoid the "script running slowly" dialog appearing for an end user.

      If you have a relatively small number of records with a great deal of properties or subobjects on each record, and you have not set `dropExtraFields` to eliminate unused data, and you see the "script running slowly" dialog, you may need to set this number lower.

      Note : This is an advanced setting

      Parameters:
        `resultBatchSize` - resultBatchSize Default value is 150

    - #### getResultBatchSize

          public int getResultBatchSize()

      Very advanced: for servers that do not support paging, and must return large numbers of XML records in one HTTP response, Smart GWT breaks up the processing of the response in order to avoid the "script running slowly" dialog appearing for an end user.

      If you have a relatively small number of records with a great deal of properties or subobjects on each record, and you have not set `dropExtraFields` to eliminate unused data, and you see the "script running slowly" dialog, you may need to set this number lower.

      Returns:
        int

    - #### setResultSetClass

          public void setResultSetClass(java.lang.String resultSetClass)
                                 throws java.lang.IllegalStateException

      Class for ResultSets used by this datasource. If null, defaults to using `ResultSet`.

      This can be set to a custom subclass of ResultSet that, for example, hangs onto to extra information necessary for integration with web services.

      Note : This is an advanced setting

      Parameters:
        `resultSetClass` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getResultSetClass

          public java.lang.String getResultSetClass()

      Class for ResultSets used by this datasource. If null, defaults to using `ResultSet`.

      This can be set to a custom subclass of ResultSet that, for example, hangs onto to extra information necessary for integration with web services.

      Returns:
        . See `String`

    - #### getSchemaNamespace

          public java.lang.String getSchemaNamespace()
                                              throws java.lang.IllegalStateException

      For a DataSource derived from WSDL or XML schema, the XML namespace this schema belongs to. This is a read-only attribute automatically present on DataSources returned from SchemaSet.getSchema and `WebService.getSchema`.

      Note : This method should be called only after the underlying component has been created.

      Returns:
        . See `String`
      Throws:
        `java.lang.IllegalStateException` - if the underlying component has not yet been created.
      See Also:
        `WsdlBinding overview and related methods`

    - #### setSendExtraFields

          public void setSendExtraFields(java.lang.Boolean sendExtraFields)
                                  throws java.lang.IllegalStateException

      Analogous to `dropExtraFields`, for data sent to the server. Setting this attribute to false ensures that for any records in the data object, only fields that correspond to declared dataSource fields will be present on the dsRequest data object passed to `DataSource.transformRequest` and ultimately sent to the server.
      Parameters:
        `sendExtraFields` - sendExtraFields Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `ClientDataIntegration overview and related methods`

    - #### getSendExtraFields

          public java.lang.Boolean getSendExtraFields()

      Analogous to `dropExtraFields`, for data sent to the server. Setting this attribute to false ensures that for any records in the data object, only fields that correspond to declared dataSource fields will be present on the dsRequest data object passed to `DataSource.transformRequest` and ultimately sent to the server.
      Returns:
        Boolean
      See Also:
        `ClientDataIntegration overview and related methods`

    - #### setSendParentNode

          public void setSendParentNode(java.lang.Boolean sendParentNode)

      Set this attribute if you need to send the dsRequest.parentNode to the server-side.

      Note : This is an advanced setting

      Parameters:
        `sendParentNode` - sendParentNode Default value is false

    - #### getSendParentNode

          public java.lang.Boolean getSendParentNode()

      Set this attribute if you need to send the dsRequest.parentNode to the server-side.
      Returns:
        Boolean

    - #### setServiceNamespace

          public void setServiceNamespace(java.lang.String serviceNamespace)
                                   throws java.lang.IllegalStateException

      For an XML DataSource, URN of the WebService to use to invoke operations. This URN comes from the "targetNamespace" attribute of the <wsdl:definitions> element in a WSDL (Web Service Description Language) document, and serves as the unique identifier of the service.

      Having loaded a WebService using `XMLTools.loadWSDL`, setting `serviceNamespace` combined with specifying `operationBindings` that set `wsOperation` will cause a DataSource to invoke web service operations to fulfill DataSource requests (`DSRequests`).

      Setting `serviceNamespace` also defaults `dataURL` to the service's location, `dataFormat` to "xml" and `dataProtocol` to "soap".

      Parameters:
        `serviceNamespace` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `WsdlBinding overview and related methods`, Weather SOAP Search Example

    - #### getServiceNamespace

          public java.lang.String getServiceNamespace()

      For an XML DataSource, URN of the WebService to use to invoke operations. This URN comes from the "targetNamespace" attribute of the <wsdl:definitions> element in a WSDL (Web Service Description Language) document, and serves as the unique identifier of the service.

      Having loaded a WebService using `XMLTools.loadWSDL`, setting `serviceNamespace` combined with specifying `operationBindings` that set `wsOperation` will cause a DataSource to invoke web service operations to fulfill DataSource requests (`DSRequests`).

      Setting `serviceNamespace` also defaults `dataURL` to the service's location, `dataFormat` to "xml" and `dataProtocol` to "soap".

      Returns:
        . See `String`
      See Also:
        `WsdlBinding overview and related methods`, Weather SOAP Search Example

    - #### setShowLocalFieldsOnly

          public void setShowLocalFieldsOnly(java.lang.Boolean showLocalFieldsOnly)
                                      throws java.lang.IllegalStateException

      For a DataSource that inherits `fields` from another DataSource (via `inheritsFrom`), indicates that only the fields listed in this DataSource should be shown. All other inherited parent fields will be marked "hidden:true".
      Parameters:
        `showLocalFieldsOnly` - showLocalFieldsOnly Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getShowLocalFieldsOnly

          public java.lang.Boolean getShowLocalFieldsOnly()

      For a DataSource that inherits `fields` from another DataSource (via `inheritsFrom`), indicates that only the fields listed in this DataSource should be shown. All other inherited parent fields will be marked "hidden:true".
      Returns:
        Boolean

    - #### setShowPrompt

          public void setShowPrompt(java.lang.Boolean showPrompt)

      Whether RPCRequests sent by this DataSource should enable `showPrompt` in order to block user interactions until the request completes.

      DataSource requests default to blocking UI interaction because, very often, if the user continues to interact with an application that is waiting for a server response, some kind of invalid or ambiguous situation can arise.

      Examples include pressing a "Save" button a second time before the first save completes, making further edits while edits are still being saved, or trying to initiate editing on a grid that hasn't loaded data.

      Defaulting to blocking the UI prevents these bad interactions, or alternatively, avoids the developer having to write repetitive code to block invalid interactions on every screen.

      If an operation should ever be non-blocking, methods that initiate DataSource requests (such as `DataSource.fetchData`) will generally have a `requestProperties` argument allowing `showPrompt` to be set to false for a specific request.

      Parameters:
        `showPrompt` - showPrompt Default value is true

    - #### getShowPrompt

          public java.lang.Boolean getShowPrompt()

      Whether RPCRequests sent by this DataSource should enable `showPrompt` in order to block user interactions until the request completes.

      DataSource requests default to blocking UI interaction because, very often, if the user continues to interact with an application that is waiting for a server response, some kind of invalid or ambiguous situation can arise.

      Examples include pressing a "Save" button a second time before the first save completes, making further edits while edits are still being saved, or trying to initiate editing on a grid that hasn't loaded data.

      Defaulting to blocking the UI prevents these bad interactions, or alternatively, avoids the developer having to write repetitive code to block invalid interactions on every screen.

      If an operation should ever be non-blocking, methods that initiate DataSource requests (such as `DataSource.fetchData`) will generally have a `requestProperties` argument allowing `showPrompt` to be set to false for a specific request.

      Returns:
        Boolean

    - #### setStrictSQLFiltering

          public void setStrictSQLFiltering(java.lang.Boolean strictSQLFiltering)
                                     throws java.lang.IllegalStateException

      If set to true, both client and server-side advanced filtering used by Smart GWT will follow SQL99 behavior for dealing with NULL values, which is often counter-intuitive to users. Specifically, when a field has NULL value, all of the following expressions are false:

               field == "someValue"  (normally false)
               field != "someValue"  (normally true)
               not (field == "someValue")   (normally true)
               not (field != "someValue")   (normally false)

      This property can be overridden per-query by specifying `strictSQLFiltering` directly as a property on the `AdvancedCriteria`.

      NOTE: On the server side, this property is only applicable if you are using the SQL DataSource; the other built-in types (Hibernate and JPA/JPA2) do not offer this mode.

      Note : This is an advanced setting

      Parameters:
        `strictSQLFiltering` - strictSQLFiltering Default value is false
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getStrictSQLFiltering

          public java.lang.Boolean getStrictSQLFiltering()

      If set to true, both client and server-side advanced filtering used by Smart GWT will follow SQL99 behavior for dealing with NULL values, which is often counter-intuitive to users. Specifically, when a field has NULL value, all of the following expressions are false:

               field == "someValue"  (normally false)
               field != "someValue"  (normally true)
               not (field == "someValue")   (normally true)
               not (field != "someValue")   (normally false)

      This property can be overridden per-query by specifying `strictSQLFiltering` directly as a property on the `AdvancedCriteria`.

      NOTE: On the server side, this property is only applicable if you are using the SQL DataSource; the other built-in types (Hibernate and JPA/JPA2) do not offer this mode.

      Returns:
        Boolean

    - #### setTagName

          public void setTagName(java.lang.String tagName)
                          throws java.lang.IllegalStateException

      Tag name to use when serializing to XML. If unspecified, the `dataSource.ID` will be used.

      Note : This is an advanced setting

      Parameters:
        `tagName` - . See `String`. Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `ClientDataIntegration overview and related methods`

    - #### getTagName

          public java.lang.String getTagName()

      Tag name to use when serializing to XML. If unspecified, the `dataSource.ID` will be used.
      Returns:
        . See `String`
      See Also:
        `ClientDataIntegration overview and related methods`

    - #### setTitle

          public void setTitle(java.lang.String title)

      User-visible name for this DataSource.

      For example, for the supplyItem DataSource, "Supply Item".

      Defaults to `dataSource.ID`.

      Parameters:
        `title` - . See `String`. Default value is dataSource.ID

    - #### getTitle

          public java.lang.String getTitle()

      User-visible name for this DataSource.

      For example, for the supplyItem DataSource, "Supply Item".

      Defaults to `dataSource.ID`.

      Returns:
        . See `String`

    - #### setTitleField

          public void setTitleField(java.lang.String titleField)
                             throws java.lang.IllegalStateException

      Best field to use for a user-visible title for an individual record from this dataSource.

      For example, for a DataSource of employees, a "full name" field would probably most clearly label an employee record.

      If not explicitly set, titleField looks for fields named "title", "label", "name", and "id" in that order. If a field exists with one of those names, it becomes the titleField. If not, then the first field is designated as the titleField.

      Parameters:
        `titleField` - . See `String`. Default value is see below
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `DsSpecialFields overview and related methods`

    - #### getTitleField

          public java.lang.String getTitleField()

      Best field to use for a user-visible title for an individual record from this dataSource.

      For example, for a DataSource of employees, a "full name" field would probably most clearly label an employee record.

      If not explicitly set, titleField looks for fields named "title", "label", "name", and "id" in that order. If a field exists with one of those names, it becomes the titleField. If not, then the first field is designated as the titleField.

      Returns:
        . See `String`
      See Also:
        `DsSpecialFields overview and related methods`

    - #### setUseFlatFields

          public void setUseFlatFields(java.lang.Boolean useFlatFields)
                                throws java.lang.IllegalStateException

      Like `useFlatFields`, but applies to all DataBound components that bind to this DataSource.
      Parameters:
        `useFlatFields` - useFlatFields Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getUseFlatFields

          public java.lang.Boolean getUseFlatFields()

      Like `useFlatFields`, but applies to all DataBound components that bind to this DataSource.
      Returns:
        Boolean

    - #### setUseHttpProxy

          public void setUseHttpProxy(java.lang.Boolean useHttpProxy)
                               throws java.lang.IllegalStateException

      Like `useHttpProxy`, but serves as a default for this DataSource that may be overridden by individual operationBindings.
      Parameters:
        `useHttpProxy` - useHttpProxy Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `ClientDataIntegration overview and related methods`

    - #### getUseHttpProxy

          public java.lang.Boolean getUseHttpProxy()

      Like `useHttpProxy`, but serves as a default for this DataSource that may be overridden by individual operationBindings.
      Returns:
        Boolean
      See Also:
        `ClientDataIntegration overview and related methods`

    - #### setUseLocalValidators

          public void setUseLocalValidators(java.lang.Boolean useLocalValidators)

      Whether to attempt validation on the client at all for this DataSource. If unset (the default), client-side validation is enabled.

      Disabling client-side validation entirely is a good way to test server-side validation.

      Note : This is an advanced setting

      Parameters:
        `useLocalValidators` - useLocalValidators Default value is null
      See Also:
        `Validation overview and related methods`

    - #### getUseLocalValidators

          public java.lang.Boolean getUseLocalValidators()

      Whether to attempt validation on the client at all for this DataSource. If unset (the default), client-side validation is enabled.

      Disabling client-side validation entirely is a good way to test server-side validation.

      Returns:
        Boolean
      See Also:
        `Validation overview and related methods`

    - #### setUseOfflineStorage

          public void setUseOfflineStorage(java.lang.Boolean useOfflineStorage)

      Whether we store server responses for this DataSource into `browser-based offline storage`, and then use those stored responses at a later time if we are offline (ie, the application cannot connect to the server). Note that by default we do NOT use offline storage for a dataSource.
      Parameters:
        `useOfflineStorage` - useOfflineStorage Default value is null

    - #### getUseOfflineStorage

          public java.lang.Boolean getUseOfflineStorage()

      Whether we store server responses for this DataSource into `browser-based offline storage`, and then use those stored responses at a later time if we are offline (ie, the application cannot connect to the server). Note that by default we do NOT use offline storage for a dataSource.
      Returns:
        Boolean

    - #### setUseParentFieldOrder

          public void setUseParentFieldOrder(java.lang.Boolean useParentFieldOrder)
                                      throws java.lang.IllegalStateException

      For a DataSource that inherits `fields` from another DataSource (via `inheritsFrom`), indicates that the parent's field order should be used instead of the order of the fields as declared in this DataSource. New fields, if any, are placed at the end.
      Parameters:
        `useParentFieldOrder` - useParentFieldOrder Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        Schema Chaining Example

    - #### getUseParentFieldOrder

          public java.lang.Boolean getUseParentFieldOrder()

      For a DataSource that inherits `fields` from another DataSource (via `inheritsFrom`), indicates that the parent's field order should be used instead of the order of the fields as declared in this DataSource. New fields, if any, are placed at the end.
      Returns:
        Boolean
      See Also:
        Schema Chaining Example

    - #### setUseStrictJSON

          public void setUseStrictJSON(java.lang.Boolean useStrictJSON)
                                throws java.lang.IllegalStateException

      Should HTTP responses to requests by this dataSource be formatted using the strict JSON subset of the javascript language? If set to true, responses returned by the server should match the format described here.

      Only applies to dataSources which send requests to a server and have `dataFormat` set to "json" or "iscServer".

      Note: using strict JSON avoids a known issue in Internet Explorer 9 where datasource transactions can leak memory due to a browser behavior where the native `eval()` method fails to clean up references when the objects go out of scope. See `allowIE9Leak` for more on this.

      Parameters:
        `useStrictJSON` - useStrictJSON Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getUseStrictJSON

          public java.lang.Boolean getUseStrictJSON()

      Should HTTP responses to requests by this dataSource be formatted using the strict JSON subset of the javascript language? If set to true, responses returned by the server should match the format described here.

      Only applies to dataSources which send requests to a server and have `dataFormat` set to "json" or "iscServer".

      Note: using strict JSON avoids a known issue in Internet Explorer 9 where datasource transactions can leak memory due to a browser behavior where the native `eval()` method fails to clean up references when the objects go out of scope. See `allowIE9Leak` for more on this.

      Returns:
        Boolean

    - #### setUseTestDataFetch

          public void setUseTestDataFetch(java.lang.Boolean useTestDataFetch)

      When set, causes a `client-only` or `cacheAllData` DataSource to create a second DataSource to perform it's one-time fetch. By default, this attribute will be considered true when clientOnly is true, cacheAllData is false or unset and a dataURL or testFileName is specified on the DataSource.
      Parameters:
        `useTestDataFetch` - useTestDataFetch Default value is null

    - #### getUseTestDataFetch

          public java.lang.Boolean getUseTestDataFetch()

      When set, causes a `client-only` or `cacheAllData` DataSource to create a second DataSource to perform it's one-time fetch. By default, this attribute will be considered true when clientOnly is true, cacheAllData is false or unset and a dataURL or testFileName is specified on the DataSource.
      Returns:
        Boolean

    - #### setValidateRelatedRecords

          public void setValidateRelatedRecords(java.lang.Boolean validateRelatedRecords)
                                         throws java.lang.IllegalStateException

      If true, indicates that the Smart GWT Server should automatically apply a `ValidatorType` of "hasRelatedRecord" to every field on this dataSource that has a `foreignKey` defined.
      Parameters:
        `validateRelatedRecords` - validateRelatedRecords Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getValidateRelatedRecords

          public java.lang.Boolean getValidateRelatedRecords()

      If true, indicates that the Smart GWT Server should automatically apply a `ValidatorType` of "hasRelatedRecord" to every field on this dataSource that has a `foreignKey` defined.
      Returns:
        Boolean

    - #### addData

          public void addData(Record newRecord)

      Perform an "add" DataSource operation against this DataSource, to create a new DataSource record.

      NOTE: do not use this method to populate a `clientOnly` DataSource. Set `cacheData` instead.

      Parameters:
        `newRecord` - new record
      See Also:
        `Operations overview and related methods`

    - #### addData

          public void addData(Record newRecord,
                     DSCallback callback)

      See Also:
        `DataSource#addData()}`

    - #### addData

          public void addData(Record newRecord,
                     DSCallback callback,
                     DSRequest requestProperties)

      Perform an "add" DataSource operation against this DataSource, to create a new DataSource record.

      NOTE: do not use this method to populate a `clientOnly` DataSource. Set `cacheData` instead.

      Parameters:
        `newRecord` - new record
        `callback` - callback to invoke on completion
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      See Also:
        `Operations overview and related methods`

    - #### compareCriteria

          public int compareCriteria(Criteria newCriteria,
                            Criteria oldCriteria)

      Given two sets of criteria, determine whether they are equivalent, the new criteria is guaranteed more restrictive, or the new criteria is not guaranteed more restrictive, returning 0, 1 or -1 respectively.

      Comparisons between `AdvancedCriteria` are made via recursively calling Operator.compareCriteria for all criteria involved.

      For simple `Criteria`, by default (`CriteriaPolicy`:"dropOnShortening"), returns:

      - -1 if the new criteria has fewer properties than the old criteria (indicating that it isn't more restrictive)
      - -1 if the value for any property in the old criteria is an array and 1) the value for the same property in the new criteria isn't an array, or 2) is an array but of different length, or 3) the arrays do not contain the exact same set of objects (order can be different)
      - -1 if the value for any given property in the old criteria is not an array, and the the value for the same property property in the new criteria is different
      - -1 if both values for a given property are strings and the new criteria value doesn't contain the old criteria value
      - 1 if none of the above are true and, for at least one of the properties, the respective criteria values are both strings, and the old criteria value is a substring of, and is shorter than, the new criteria value
      - 0 otherwise (indicating the sets of criteria are equivalent)

      For (`CriteriaPolicy`:"dropOnChange"), returns:

      - -1 if the two sets of criteria have a different number of properties
      - -1 if the value for any property in the old criteria is an array and 1) the value for the same property in the new criteria isn't an array, or 2) is an array but of different length, or 3) the arrays do not contain the exact same set of objects (order can be different)
      - -1 if the value for any given property in the old criteria is not an array, and the the value for the same property in the new criteria is different
      - 0 otherwise (indicating the sets of criteria are equivalent)
      This method is called by `ResultSet.compareCriteria` to determine whether a change in criteria should cause the cache to be invalidated. You may want to override this method in order to mimic the filtering behavior that your server performs.
      Parameters:
        `newCriteria` - new filter criteria
        `oldCriteria` - previous filter criteria
      Returns:
        0 if the filters are equivalent, 1 if newCriteria is guaranteed more restrictive, and -1 if newCriteria is not guaranteed more restrictive
      See Also:
        `CriteriaPolicy`

    - #### compareCriteria

          public int compareCriteria(Criteria newCriteria,
                            Criteria oldCriteria,
                            DSRequest requestProperties)

      See Also:
        `DataSource#compareCriteria()}`

    - #### compareCriteria

          public int compareCriteria(Criteria newCriteria,
                            Criteria oldCriteria,
                            DSRequest requestProperties,
                            java.lang.String policy)

      Given two sets of criteria, determine whether they are equivalent, the new criteria is guaranteed more restrictive, or the new criteria is not guaranteed more restrictive, returning 0, 1 or -1 respectively.

      Comparisons between `AdvancedCriteria` are made via recursively calling Operator.compareCriteria for all criteria involved.

      For simple `Criteria`, by default (`CriteriaPolicy`:"dropOnShortening"), returns:

      - -1 if the new criteria has fewer properties than the old criteria (indicating that it isn't more restrictive)
      - -1 if the value for any property in the old criteria is an array and 1) the value for the same property in the new criteria isn't an array, or 2) is an array but of different length, or 3) the arrays do not contain the exact same set of objects (order can be different)
      - -1 if the value for any given property in the old criteria is not an array, and the the value for the same property property in the new criteria is different
      - -1 if both values for a given property are strings and the new criteria value doesn't contain the old criteria value
      - 1 if none of the above are true and, for at least one of the properties, the respective criteria values are both strings, and the old criteria value is a substring of, and is shorter than, the new criteria value
      - 0 otherwise (indicating the sets of criteria are equivalent)

      For (`CriteriaPolicy`:"dropOnChange"), returns:

      - -1 if the two sets of criteria have a different number of properties
      - -1 if the value for any property in the old criteria is an array and 1) the value for the same property in the new criteria isn't an array, or 2) is an array but of different length, or 3) the arrays do not contain the exact same set of objects (order can be different)
      - -1 if the value for any given property in the old criteria is not an array, and the the value for the same property in the new criteria is different
      - 0 otherwise (indicating the sets of criteria are equivalent)
      This method is called by `ResultSet.compareCriteria` to determine whether a change in criteria should cause the cache to be invalidated. You may want to override this method in order to mimic the filtering behavior that your server performs.
      Parameters:
        `newCriteria` - new filter criteria
        `oldCriteria` - previous filter criteria
        `requestProperties` - dataSource request properties
        `policy` - overrides `CriteriaPolicy`
      Returns:
        0 if the filters are equivalent, 1 if newCriteria is guaranteed more restrictive, and -1 if newCriteria is not guaranteed more restrictive
      See Also:
        `CriteriaPolicy`

    - #### compareDates

          public int compareDates(java.util.Date date1,
                         java.util.Date date2,
                         java.lang.String fieldName)

      Convenience method to compare two Date objects appropriately, depending on whether the passed-in fieldName refers to a field of `type` "datetime" or "date". In the former case, the dates are compared using `Date.compareDates`; in the latter case, or if the supplied fieldName is null or unknown to this DataSource, the dates are compared using `Date.compareLogicalDates`.
      Parameters:
        `date1` - First date in comparison
        `date2` - Second date in comparison
        `fieldName` - The name of the field for which the comparison is being run
      Returns:
        0 if equal, -1 if first date > second date, 1 if second date > first date

    - #### convertRelativeDates

          public Criteria convertRelativeDates(Criteria criteria)

      Takes all relative date values found anywhere within a Criteria / AdvancedCriteria object and converts them to concrete date values, returning the new criteria object.
      Parameters:
        `criteria` - criteria to convert
      Returns:
        new copy of the criteria with all relative dates converted

    - #### convertRelativeDates

          public Criteria convertRelativeDates(Criteria criteria,
                                      java.lang.String timezoneOffset)

      See Also:
        `DataSource#convertRelativeDates()}`

    - #### convertRelativeDates

          public Criteria convertRelativeDates(Criteria criteria,
                                      java.lang.String timezoneOffset,
                                      java.lang.Integer firstDayOfWeek)

      Takes all relative date values found anywhere within a Criteria / AdvancedCriteria object and converts them to concrete date values, returning the new criteria object.
      Parameters:
        `criteria` - criteria to convert
        `timezoneOffset` - optional timezone offset. Defaults to the current timezone
        `firstDayOfWeek` - first day of the week (zero is Sunday). Defaults to `firstDayOfWeek`
      Returns:
        new copy of the criteria with all relative dates converted

    - #### copyRecord

          public Record copyRecord(Record record)

      Copies all DataSource field values of a Record (including a TreeNode) to a new Record, omitting component-specific metadata such as selected state from grids, or parent folders for TreeNodes.
      Parameters:
        `record` - The record to be copied.
      Returns:
        A new copy of the record provided as an argument, with component-specific metata data removed.

    - #### copyRecords

          public Record[] copyRecords(Record... records)

      Copies all DataSource field values of an (Array) of Records (including a TreeNode) to a new array of Records, omitting component-specific metadata such as selected state from grids, or parent folders for TreeNodes. This method calls `DataSource.copyRecord` for each item in the array.
      Parameters:
        `records` - The array of Record objects to be copied.
      Returns:
        A new copy of each record provided in the array argument, with component-specific metata data removed.

    - #### downloadFile

          public void downloadFile(Record data)

      Download a file stored in a field of type:"binary" in a DataSource record.

      This will trigger the browser's "Save As" dialog and allow the user to save the file associated with some record.

      Note that if this method is called for a record with no associated file, the download URL may not be functional. By default when dataSources encounter a `binary type fields`, an additional field, `<fieldName>_filename`, is generated to store the filename for the binary field value. If this field is present in the data source but has no value for this record, developers can assume they're working with a record with no stored file. If this field is not present in some custom dataSource configuration, or the record is not loaded on the client, an additional server transaction may be required to determine whether the record has an associated file before calling this method to download a file.

      See the overview of `Binary Fields` for more details.

      Parameters:
        `data` - Record to download. Only required to have a value for the primary key field.

    - #### downloadFile

          public void downloadFile(Record data,
                          java.lang.String fieldName)

      See Also:
        `DataSource#downloadFile()}`

    - #### downloadFile

          public void downloadFile(Record data,
                          java.lang.String fieldName,
                          DSRequest requestProperties)

      Download a file stored in a field of type:"binary" in a DataSource record.

      This will trigger the browser's "Save As" dialog and allow the user to save the file associated with some record.

      Note that if this method is called for a record with no associated file, the download URL may not be functional. By default when dataSources encounter a `binary type fields`, an additional field, `<fieldName>_filename`, is generated to store the filename for the binary field value. If this field is present in the data source but has no value for this record, developers can assume they're working with a record with no stored file. If this field is not present in some custom dataSource configuration, or the record is not loaded on the client, an additional server transaction may be required to determine whether the record has an associated file before calling this method to download a file.

      See the overview of `Binary Fields` for more details.

      Parameters:
        `data` - Record to download. Only required to have a value for the primary key field.
        `fieldName` - optional name of the binary field containing the file. If not provided, the first binary field is used
        `requestProperties` - additional properties to set on the DSRequest that will be issued

    - #### evaluateCriterion

          public boolean evaluateCriterion(Record record,
                                  Criterion criterion)

      Evaluate the given criterion with respect to the passed record.

      Typically called by the condition function of a custom Operator to evaluate `sub-criteria`.

      Parameters:
        `record` - record to evaluate
        `criterion` - criterion to use
      Returns:
        whether the record meets the supplied `Criterion`

    - #### exportData

          public void exportData()

      Perform a "fetch" DataSource operation against this DataSource, sending search criteria, retrieving matching records and exporting the results. See `exportResults` or `exportResults` and for more information.
      See Also:
        `Operations overview and related methods`

    - #### exportData

          public void exportData(Criteria criteria)

      See Also:
        `DataSource#exportData()}`

    - #### exportData

          public void exportData(Criteria criteria,
                        DSRequest requestProperties)

      See Also:
        `DataSource#exportData()}`

    - #### exportData

          public void exportData(Criteria criteria,
                        DSRequest requestProperties,
                        DSCallback callback)

      Perform a "fetch" DataSource operation against this DataSource, sending search criteria, retrieving matching records and exporting the results. See `exportResults` or `exportResults` and for more information.
      Parameters:
        `criteria` - search criteria
        `requestProperties` - additional properties to set on the DSRequest that will be issued
        `callback` - callback to invoke on completion. Note that this parameter only applies where `exportToClient` is explicitly set to false, because file downloads do not provide ordinary Smart GWT callbacks
      See Also:
        `Operations overview and related methods`

    - #### fetchData

          public void fetchData()

      Perform a "fetch" DataSource operation against this DataSource, sending search criteria and retrieving matching records.

      NOTE: do not attempt to override this method to create a custom DataSource. For a server-side custom DataSource, use the `serverConstructor` attribute, and the @see Custom DataSource samples. For a client-side custom DataSource, see `dataProtocol:"custom"`.

      In contrast to `ListGrid.fetchData`, which creates a `ResultSet` to manage the returned data, calling `dataSource.fetchData()` provides the returned data in the callback as a RecordList or simple Array of Record objects. Calling `dataSource.fetchData()` does not automatically update any visual components or caches: code in the callback passed to `fetchData()` decides what to do with the returned data.

      For example, given a ListGrid "myGrid" and a DataSource "employees", the following code would populate "myGrid" with data fetched from the DataSource:

               DataSource.get("employees").fetchData(null, new DSCallback() {
                   public void execute(DSResponse response, Object rawData, DSRequest request) {
                       myGrid.setData(response.getData());
                   }
               });

      Unlike calling `myGrid.fetchData()`, which creates a `ResultSet`, the data provided to the grid is "disconnected" data, unmanaged by Smart GWT's databinding facilities and safe to directly modify. This is useful when, for example, a ListGrid is being used as a more sophisticated version of HTML's multi-select component.

      Disconnected datasets may be used to populate various visual components. For example, while an individual FormItem can be configured to fetch `valueMap` options from a DataSource via the `optionDataSource` property, the following code shows storing a dataset to derive valueMaps from later:

                 // Assume GlobalStore.allCountries is a public static variable of type RecordList
                 DataSource.get("countries").fetchData(null, new DSCallback(){
                    public void execute(DSResponse response, Object rawData, DSRequest request) {
                       GlobalStore.allCountries = response.getDataAsRecordList();
                    }
                 });
                 ... later, while a DynamicForm is being created ...
                 SelectItem select = new SelectItem("country", "Pick Country");
                 Map valueMap = GlobalStore.countries.getValueMap("countryId", "countryName");
                 myItem.setValueMap(new LinkedHashMap(valueMap));

      You can also create a ResultSet from the data retrieved from `fetchData()`, like so:

               DataSource.get("countries").fetchData(null, new DSCallback() {
                   public void execute(DSResponse response, Object rawData, DSRequest request) {
                       ResultSet rs = new ResultSet(DataSource.get("countries"));
                       rs.setAllRows(response.getData());
                   }
               });

      This gives you a dataset that supports client-side filtering (via `setCriteria()`), can provide `filtered valueMaps`, will `automatically reflect updates` to the DataSource made via other components, and can be re-used with multiple visual components.

      See also `DataSource.getClientOnlyDataSource` and `cacheAllData` for similar capabilities for dealing with smaller datasets entirely within the browser, or working with modifiable caches representing subsets of the data available from a DataSource.

      See also the server-side com.isomorphic.js.JSTranslater class in the ${isc.DocUtils.linkForDocNode('javaServerReference', 'Java Server Reference')} for other, similar approaches involving dumping data into the page during initial page load. Note: care should be taken when using this approach. Large datasets degrade the basic performance of some browsers, so use optionDataSource and similar facilities to manage datasets that may become very large.

      Data-Driven Visual Component Creation

      `DataSource.fetchData()` can also be used to create Smart GWT components in a data-driven way. For example, if you had a DataSource "myGridFields" whose fields included the basic properties of `ListGridField` (name, title, type, etc), this example code would create a form based on stored field definitions, loaded from the "myFormFields" DataSource on the fly:

              DataSource.get("myFormFields").fetchData(null, new DSCallback(){
                  public void execute(DSResponse response, Object rawData, DSRequest request) {
                     Record[] records = response.getData();
                     ListGridField[] fields = new ListGridField[records.length];
                     for (Record record in records) {
                         ListGridField field = new ListGridField();
                         field.setName(record.getAttribute("name"));
                         field.setTitle(record.getAttribute("title"));
                         field.setType(ListGridFieldType.valueOf(record.getAttribute("type")));
                     }
                     ListGrid grid = new ListGrid();
                     grid.setFields(fields);
                  }
              });

      This capability to dynamically create visual components from dynamically fetched data provides a foundation for creating interfaces that can be customized by end users. See also the server-side API com.isomorphic.datasource.DataSource.addDynamicDSGenerator() for dynamically creating DataSources supporting all server-side DataSource features, and `inheritsFrom` for sharing field definitions across multiple DataSources.
      See Also:
        `Operations overview and related methods`

    - #### fetchData

          public void fetchData(Criteria criteria)

      See Also:
        `DataSource#fetchData()}`

    - #### fetchData

          public void fetchData(Criteria criteria,
                       DSCallback callback)

      See Also:
        `DataSource#fetchData()}`

    - #### fetchData

          public void fetchData(Criteria criteria,
                       DSCallback callback,
                       DSRequest requestProperties)

      Perform a "fetch" DataSource operation against this DataSource, sending search criteria and retrieving matching records.

      NOTE: do not attempt to override this method to create a custom DataSource. For a server-side custom DataSource, use the `serverConstructor` attribute, and the @see Custom DataSource samples. For a client-side custom DataSource, see `dataProtocol:"custom"`.

      In contrast to `ListGrid.fetchData`, which creates a `ResultSet` to manage the returned data, calling `dataSource.fetchData()` provides the returned data in the callback as a RecordList or simple Array of Record objects. Calling `dataSource.fetchData()` does not automatically update any visual components or caches: code in the callback passed to `fetchData()` decides what to do with the returned data.

      For example, given a ListGrid "myGrid" and a DataSource "employees", the following code would populate "myGrid" with data fetched from the DataSource:

               DataSource.get("employees").fetchData(null, new DSCallback() {
                   public void execute(DSResponse response, Object rawData, DSRequest request) {
                       myGrid.setData(response.getData());
                   }
               });

      Unlike calling `myGrid.fetchData()`, which creates a `ResultSet`, the data provided to the grid is "disconnected" data, unmanaged by Smart GWT's databinding facilities and safe to directly modify. This is useful when, for example, a ListGrid is being used as a more sophisticated version of HTML's multi-select component.

      Disconnected datasets may be used to populate various visual components. For example, while an individual FormItem can be configured to fetch `valueMap` options from a DataSource via the `optionDataSource` property, the following code shows storing a dataset to derive valueMaps from later:

                 // Assume GlobalStore.allCountries is a public static variable of type RecordList
                 DataSource.get("countries").fetchData(null, new DSCallback(){
                    public void execute(DSResponse response, Object rawData, DSRequest request) {
                       GlobalStore.allCountries = response.getDataAsRecordList();
                    }
                 });
                 ... later, while a DynamicForm is being created ...
                 SelectItem select = new SelectItem("country", "Pick Country");
                 Map valueMap = GlobalStore.countries.getValueMap("countryId", "countryName");
                 myItem.setValueMap(new LinkedHashMap(valueMap));

      You can also create a ResultSet from the data retrieved from `fetchData()`, like so:

               DataSource.get("countries").fetchData(null, new DSCallback() {
                   public void execute(DSResponse response, Object rawData, DSRequest request) {
                       ResultSet rs = new ResultSet(DataSource.get("countries"));
                       rs.setAllRows(response.getData());
                   }
               });

      This gives you a dataset that supports client-side filtering (via `setCriteria()`), can provide `filtered valueMaps`, will `automatically reflect updates` to the DataSource made via other components, and can be re-used with multiple visual components.

      See also `DataSource.getClientOnlyDataSource` and `cacheAllData` for similar capabilities for dealing with smaller datasets entirely within the browser, or working with modifiable caches representing subsets of the data available from a DataSource.

      See also the server-side com.isomorphic.js.JSTranslater class in the ${isc.DocUtils.linkForDocNode('javaServerReference', 'Java Server Reference')} for other, similar approaches involving dumping data into the page during initial page load. Note: care should be taken when using this approach. Large datasets degrade the basic performance of some browsers, so use optionDataSource and similar facilities to manage datasets that may become very large.

      Data-Driven Visual Component Creation

      `DataSource.fetchData()` can also be used to create Smart GWT components in a data-driven way. For example, if you had a DataSource "myGridFields" whose fields included the basic properties of `ListGridField` (name, title, type, etc), this example code would create a form based on stored field definitions, loaded from the "myFormFields" DataSource on the fly:

              DataSource.get("myFormFields").fetchData(null, new DSCallback(){
                  public void execute(DSResponse response, Object rawData, DSRequest request) {
                     Record[] records = response.getData();
                     ListGridField[] fields = new ListGridField[records.length];
                     for (Record record in records) {
                         ListGridField field = new ListGridField();
                         field.setName(record.getAttribute("name"));
                         field.setTitle(record.getAttribute("title"));
                         field.setType(ListGridFieldType.valueOf(record.getAttribute("type")));
                     }
                     ListGrid grid = new ListGrid();
                     grid.setFields(fields);
                  }
              });

      This capability to dynamically create visual components from dynamically fetched data provides a foundation for creating interfaces that can be customized by end users. See also the server-side API com.isomorphic.datasource.DataSource.addDynamicDSGenerator() for dynamically creating DataSources supporting all server-side DataSource features, and `inheritsFrom` for sharing field definitions across multiple DataSources.
      Parameters:
        `criteria` - search criteria
        `callback` - callback to invoke on completion
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      See Also:
        `Operations overview and related methods`

    - #### fetchRecord

          public void fetchRecord(java.lang.Object pkValue)

      Fetch a single record from the DataSource by `primary key`. This simply calls `DataSource.fetchData` after creating `Criteria` that contain the primary key field and value.

      If you call this method on a DataSource with a composite primary key - ie, one with multiple primaryKey fields - this method returns the first record where the first defined primary field matches the supplied pkValue; this may or may not be meaningful, depending on your use case. Generally, for DataSources with composite keys, it makes more sense to use `fetchData()` directly, rather than this convenience method.

      Parameters:
        `pkValue` - value for the field marked `primaryKey`:true in this DataSource (or the first field so marked if there is more than one)

    - #### fetchRecord

          public void fetchRecord(java.lang.Object pkValue,
                         DSCallback callback)

      See Also:
        `DataSource#fetchRecord()}`

    - #### fetchRecord

          public void fetchRecord(java.lang.Object pkValue,
                         DSCallback callback,
                         DSRequest requestProperties)

      Fetch a single record from the DataSource by `primary key`. This simply calls `DataSource.fetchData` after creating `Criteria` that contain the primary key field and value.

      If you call this method on a DataSource with a composite primary key - ie, one with multiple primaryKey fields - this method returns the first record where the first defined primary field matches the supplied pkValue; this may or may not be meaningful, depending on your use case. Generally, for DataSources with composite keys, it makes more sense to use `fetchData()` directly, rather than this convenience method.

      Parameters:
        `pkValue` - value for the field marked `primaryKey`:true in this DataSource (or the first field so marked if there is more than one)
        `callback` - callback to invoke on completion
        `requestProperties` - additional properties to set on the DSRequest that will be issued

    - #### fieldMatchesFilter

          public boolean fieldMatchesFilter(java.lang.Object fieldValue,
                                   java.lang.Object filterValue)

      Compares a criteria value to a field value and returns whether they match, as follows:
      - any non-String filter value is directly compared (==) to the field value
      - any String filter value is compared according to `textMatchStyle` in the passed `requestProperties`, regardless of the actual field type
      - if the filter value is an Array, the comparison is a logical OR. If textMatchStyle is "exact", it matches if fieldValue (or any of it's entries, if it's also an array) is contained in the filterValue Array. If textMatchStyle if substring, it matches if any of the entries in filterValue appear as a case-insensitive substring of any of the entries in fieldValue.
      Parameters:
        `fieldValue` - field value to be compared
        `filterValue` - filter value to be compared
      Returns:
        true if the filter and field values match, false otherwise

    - #### fieldMatchesFilter

          public boolean fieldMatchesFilter(java.lang.Object fieldValue,
                                   java.lang.Object filterValue,
                                   DSRequest requestProperties)

      Compares a criteria value to a field value and returns whether they match, as follows:
      - any non-String filter value is directly compared (==) to the field value
      - any String filter value is compared according to `textMatchStyle` in the passed `requestProperties`, regardless of the actual field type
      - if the filter value is an Array, the comparison is a logical OR. If textMatchStyle is "exact", it matches if fieldValue (or any of it's entries, if it's also an array) is contained in the filterValue Array. If textMatchStyle if substring, it matches if any of the entries in filterValue appear as a case-insensitive substring of any of the entries in fieldValue.
      Parameters:
        `fieldValue` - field value to be compared
        `filterValue` - filter value to be compared
        `requestProperties` - optional dataSource request properties
      Returns:
        true if the filter and field values match, false otherwise

    - #### filterData

          public void filterData()

      Perform a "fetch" DataSource operation against this DataSource, sending search criteria and retrieving matching records.

      This is identical to `DataSource.fetchData` except that `textMatchStyle` is set to "substring" to cause case insensitive substring matching (if the server respects this setting).

      See Also:
        `Operations overview and related methods`

    - #### filterData

          public void filterData(Criteria criteria)

      See Also:
        `DataSource#filterData()}`

    - #### filterData

          public void filterData(Criteria criteria,
                        DSCallback callback)

      See Also:
        `DataSource#filterData()}`

    - #### filterData

          public void filterData(Criteria criteria,
                        DSCallback callback,
                        DSRequest requestProperties)

      Perform a "fetch" DataSource operation against this DataSource, sending search criteria and retrieving matching records.

      This is identical to `DataSource.fetchData` except that `textMatchStyle` is set to "substring" to cause case insensitive substring matching (if the server respects this setting).

      Parameters:
        `criteria` - search criteria
        `callback` - callback to invoke on completion
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      See Also:
        `Operations overview and related methods`

    - #### getClientOnlyDataSource

          public void getClientOnlyDataSource(Criteria criteria,
                                     ClientOnlyDataSourceCallback callback)

      Produces a clientOnly "copy" of a particular subset of data from a normal DataSource, via calling fetchData() to fetch matching rows, and constructing a clientOnly DataSource that `inheritsFrom` the original DataSource.

      This clientOnly "copy" can be useful in situations where you want to allow a series of local changes without immediately committing to the server. See also `autoSaveEdits` for more fine-grained tracking of edits (eg, special styling for uncommitted changes).

      The new DataSource is returned via the "callback" argument. If `cacheAllData` is enabled and `DataSource.hasAllData` returns true, the new DataSource is synchronously returned as the result of the method. In this case, if a callback was passed, it also is executed synchronously.

      Parameters:
        `criteria` - The criteria for the clientOnly DS
        `callback` - The callback to fire passing the clientOnly DS

    - #### getClientOnlyDataSource

          public void getClientOnlyDataSource(Criteria criteria,
                                     ClientOnlyDataSourceCallback callback,
                                     DSRequest requestProperties)

      See Also:
        `DataSource#getClientOnlyDataSource()}`

    - #### getClientOnlyDataSource

          public void getClientOnlyDataSource(Criteria criteria,
                                     ClientOnlyDataSourceCallback callback,
                                     DSRequest requestProperties,
                                     DataSource dataSourceProperties)

      Produces a clientOnly "copy" of a particular subset of data from a normal DataSource, via calling fetchData() to fetch matching rows, and constructing a clientOnly DataSource that `inheritsFrom` the original DataSource.

      This clientOnly "copy" can be useful in situations where you want to allow a series of local changes without immediately committing to the server. See also `autoSaveEdits` for more fine-grained tracking of edits (eg, special styling for uncommitted changes).

      The new DataSource is returned via the "callback" argument. If `cacheAllData` is enabled and `DataSource.hasAllData` returns true, the new DataSource is synchronously returned as the result of the method. In this case, if a callback was passed, it also is executed synchronously.

      Parameters:
        `criteria` - The criteria for the clientOnly DS
        `callback` - The callback to fire passing the clientOnly DS
        `requestProperties` - optional properties to pass through to the DSRequest
        `dataSourceProperties` - optional properties to pass through to the clientOnly DS

    - #### getClientOnlyResponse

          protected DSResponse getClientOnlyResponse(DSRequest request,
                                         Record... serverData)

      Return a "spoofed" response for a `clientOnly` or `cacheAllData` DataSource.

      The default implementation will use `cacheData` to provide an appropriate response, by using `client-side filtering` for a "fetch" request, and by modifying the `testData` for other requests.

      Override this method to provide simulations of other server-side behavior, such as modifying other records, or to implement synchronous client-side data providers (such as Google Gears). For asynchronous third-party data providers, such as GWT-RPC, HTML5 sockets, or bridges to plug-in based protocols (Java, Flash, Silverlight..), use `dataProtocol:"clientCustom"` instead.

      Overriding this method is also a means of detecting that a normal DataSource (not clientOnly) would be contacting the server.

      Parameters:
        `request` - DataSource request to respond to
        `serverData` - for cacheAllData DataSources, the data from the local cache
      Returns:

    - #### getDisplayValue

          public java.lang.Object getDisplayValue(java.lang.String fieldName,
                                         java.lang.Object value)

      Given a fieldName and a dataValue, apply any `valueMap` for the field and return the display value for the field
      Parameters:
        `fieldName` - name of the field to retrieve a value for
        `value` - data value for the field
      Returns:
        display value for the field

    - #### getFetchDataURL

          public java.lang.String getFetchDataURL(Criteria criteria)

      Returns a URL to DataSource fetch operation. This API is intended to return media such as images or videos to the browser.

      Note that because the entirety of the request is encoded in the URL, there is an inherent limitation on the amount of data that you can send viat he criteria argument to the server. The actual length depends on your server configuration and other factors such as the size of cookies (if any) being sent to the server and other HTTP headers in use. Conservatively, assume that you have about 2 kilobytes to work with.

      Parameters:
        `criteria` - Criteria to be sent to server.
      Returns:
        a URL that targets the specified fetch operation.

    - #### getFetchDataURL

          public java.lang.String getFetchDataURL(Criteria criteria,
                                         DSRequest requestProperties)

      Returns a URL to DataSource fetch operation. This API is intended to return media such as images or videos to the browser.

      Note that because the entirety of the request is encoded in the URL, there is an inherent limitation on the amount of data that you can send viat he criteria argument to the server. The actual length depends on your server configuration and other factors such as the size of cookies (if any) being sent to the server and other HTTP headers in use. Conservatively, assume that you have about 2 kilobytes to work with.

      Parameters:
        `criteria` - Criteria to be sent to server.
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      Returns:
        a URL that targets the specified fetch operation.

    - #### getField

          public DataSourceField getField(java.lang.String fieldName)

      Return the field definition object.
      Parameters:
        `fieldName` - Name of the field to retrieve
      Returns:
        field object

    - #### getFieldCriterion

          public Criteria getFieldCriterion(Criteria criterion,
                                   java.lang.String fieldName)

      Returns the depth-first match of a criterion matching the given fieldName.
      Parameters:
        `criterion` - the criteria to search
        `fieldName` - the fieldName to find criteria for
      Returns:
        the depth-first matching criterion for the passed fieldName

    - #### getFieldForDataPath

          public DataSourceField getFieldForDataPath(java.lang.String dataPath)

      Return the field definition object corresponding to the supplied dataPath
      Parameters:
        `dataPath` - dataPath of the field to retrieve
      Returns:
        field object, or null if no field corresponds to the supplied dataPath

    - #### getLegalChildTags

          public void getLegalChildTags()

      For a DataSource that describes a DOM structure, the list of legal child elements that can be contained by the element described by this DataSource.

      For a DataSource described by XML schema, this is the list of legal subelements of complexType (elements of simpleType become DataSourceFields with atomic type).

      Note that currently, if an XML schema file contains ordering constraints, DataSources derived from XML Schema do not capture these constraints.

    - #### getPrimaryKeyField

          public DataSourceField getPrimaryKeyField()

      Returns a pointer to the primaryKey field for this DataSource. If this dataSource has a composite primary key (ie, multiple primaryKey fields), returns just the first primaryKey field.
      Returns:
        primary key field object
      See Also:
        `getPrimaryKeyFields()`

    - #### getPrimaryKeyFieldName

          public java.lang.String getPrimaryKeyFieldName()

      Returns the primary key fieldName for this DataSource. If this dataSource has a composite primary key (ie, multiple primaryKey fields), returns just the first primaryKey field name.
      Returns:
        primary key field name
      See Also:
        `getPrimaryKeyFieldNames()`

    - #### getPrimaryKeyFields

          public Record getPrimaryKeyFields()

      Returns this DataSource's `primaryKey` fields as a map of fieldName to field.
      Returns:
        Javascript object containing all this datasource's primaryKey fields, as a map of field name to field
      See Also:
        `getPrimaryKeyField()`, `getPrimaryKeyFieldNames()`

    - #### setHandleErrorCallback

          public void setHandleErrorCallback(HandleErrorCallback callback)

      If you define this method on a DataSource, it will be called whenever the server returns a DSResponse with a status other than `STATUS_SUCCESS`. You can use this hook to do DataSource-specific error handling. Unless you return `false` from this method, `RPCManager.handleError` will be called by Smart GWT right after this method completes.
      Parameters:
        `callback` - HandleErrorCallback the callback to set.

    - #### addHandleErrorHandler

          public com.google.gwt.event.shared.HandlerRegistration addHandleErrorHandler(HandleErrorHandler handler)

      Add a handleError handler.

      If you define this method on a DataSource, it will be called whenever the server returns a DSResponse with a status other than `STATUS_SUCCESS`. You can use this hook to do DataSource-specific error handling. Unless you return `false` from this method, `RPCManager.handleError` will be called by Smart GWT right after this method completes.

      Specified by:
        `addHandleErrorHandler` in interface `HasHandleErrorHandlers`
      Parameters:
        `handler` - the handleError handler
      Returns:
        `HandlerRegistration` used to remove this handler

    - #### hasAllData

          public java.lang.Boolean hasAllData()

      When `cacheAllData` is true, has all the data been retrieved to the client?
      Returns:
        All data has been fetched from the server and is available client-side

    - #### invalidateCache

          public void invalidateCache()

      Invalidate the cache when `cacheAllData` or `clientOnly` are true.

    - #### performCustomOperation

          public void performCustomOperation(java.lang.String operationId)

      Invoke an operation declared with `operationType` "custom".

      This is a rarely used API. If the operation you are performing can be thought of as one of the standard "CRUD" `operation types`, declare it with a CRUD operationType. For example, if your operation updates a record, declare it with operationType "update" and invoke it via `DataSource.updateData` - this will cause `cache sync` to work correctly.

      In particular:

      - do not use this API just because you need to add additional server-side logic to a CRUD operation (DMI allows this)
      - do not use this API to implement variants of core CRUD operations (`operationId` is the correct way to do this)
      - do not use this API just because an operation affects more than one record. Most kinds of multi-record operations should use `queuing`.
      - do not use this API just because you are calling a stored procedure in SQL - if the stored procedure performs some kind of CRUD operation on the records of this DataSource, use a standard CRUD operationType

      Instead, the specific purpose of this API is to bypass all checks and side effects that normally occur for CRUD operations, for example, that a "fetch" requires valid Criteria or that an "update" or "remove" operation contains a valid primary key, or that an "add" operation returns the newly added record. `performCustomOperation` allows you to pass an arbitrary Record to the server, act on it with custom code, and return arbitray results or even no results.

      The "data" parameter becomes `data`. With the Smart GWT Server Framework, the data is accessible server-side via DSRequest.getValues() and in Velocity templates (such as <customSQL>) as $values.

      Note that with SQLDataSource, `performCustomOperation` must be used if you plan to have a <customSQL> tag in your operationBinding that will execute SQL operations other than SELECT, UPDATE, INSERT, DELETE (such as creating a new table). By declaring `operationType` "custom" in your .ds.xml file, all checks related to normal CRUD operations will be skipped and your <customSQL> can do arbitrary things.

      Parameters:
        `operationId` - the operation ID
      See Also:
        `Operations overview and related methods`

    - #### performCustomOperation

          public void performCustomOperation(java.lang.String operationId,
                                    Record data)

      See Also:
        `DataSource#performCustomOperation()}`

    - #### performCustomOperation

          public void performCustomOperation(java.lang.String operationId,
                                    Record data,
                                    DSCallback callback)

      See Also:
        `DataSource#performCustomOperation()}`

    - #### performCustomOperation

          public void performCustomOperation(java.lang.String operationId,
                                    Record data,
                                    DSCallback callback,
                                    DSRequest requestProperties)

      Invoke an operation declared with `operationType` "custom".

      This is a rarely used API. If the operation you are performing can be thought of as one of the standard "CRUD" `operation types`, declare it with a CRUD operationType. For example, if your operation updates a record, declare it with operationType "update" and invoke it via `DataSource.updateData` - this will cause `cache sync` to work correctly.

      In particular:

      - do not use this API just because you need to add additional server-side logic to a CRUD operation (DMI allows this)
      - do not use this API to implement variants of core CRUD operations (`operationId` is the correct way to do this)
      - do not use this API just because an operation affects more than one record. Most kinds of multi-record operations should use `queuing`.
      - do not use this API just because you are calling a stored procedure in SQL - if the stored procedure performs some kind of CRUD operation on the records of this DataSource, use a standard CRUD operationType

      Instead, the specific purpose of this API is to bypass all checks and side effects that normally occur for CRUD operations, for example, that a "fetch" requires valid Criteria or that an "update" or "remove" operation contains a valid primary key, or that an "add" operation returns the newly added record. `performCustomOperation` allows you to pass an arbitrary Record to the server, act on it with custom code, and return arbitray results or even no results.

      The "data" parameter becomes `data`. With the Smart GWT Server Framework, the data is accessible server-side via DSRequest.getValues() and in Velocity templates (such as <customSQL>) as $values.

      Note that with SQLDataSource, `performCustomOperation` must be used if you plan to have a <customSQL> tag in your operationBinding that will execute SQL operations other than SELECT, UPDATE, INSERT, DELETE (such as creating a new table). By declaring `operationType` "custom" in your .ds.xml file, all checks related to normal CRUD operations will be skipped and your <customSQL> can do arbitrary things.

      Parameters:
        `operationId` - the operation ID
        `data` - data to pass to the server.
        `callback` - callback to invoke on completion
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      See Also:
        `Operations overview and related methods`

    - #### processResponse

          public void processResponse(java.lang.String requestId,
                             DSResponse dsResponse)

      Process a dsResponse for a request initiated by a DataSource with `dataProtocol:"clientCustom"`. `requestId` parameter should be dsRequest.requestId as found on the dsRequest passed to `DataSource.transformRequest`.

      You must provide a response for both error and non-error cases. For an error case, a sufficient response is:

            { status : -1 }

      Parameters:
        `requestId` - requestId attribute from the associated dataSource request object
        `dsResponse` - Configuration for the dsResponse

    - #### removeData

          public void removeData(Record data)

      Perform a "remove" DataSource operation against this DataSource, to delete an existing DataSource record.
      Parameters:
        `data` - primary key values of record to delete, (or complete record)
      See Also:
        `Operations overview and related methods`

    - #### removeData

          public void removeData(Record data,
                        DSCallback callback)

      See Also:
        `DataSource#removeData()}`

    - #### removeData

          public void removeData(Record data,
                        DSCallback callback,
                        DSRequest requestProperties)

      Perform a "remove" DataSource operation against this DataSource, to delete an existing DataSource record.
      Parameters:
        `data` - primary key values of record to delete, (or complete record)
        `callback` - callback to invoke on completion
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      See Also:
        `Operations overview and related methods`

    - #### splitCriteria

          public Criteria splitCriteria(Criteria criteria,
                               java.lang.String[] fields)

      Split a criteria apart based on `fields`. A new simple criteria is returned with any criteria applicable to the specified fields. The passed `criteria` is then modified to remove these fields resulting in two distinct criteria.

      Incoming criteria can be a simple or advanced criteria. For an `AdvancedCriteria` only a single level of criteria with a top-level operator of "and" is supported.

      To avoid modifying an original criteria, use `DataSource.copyCriteria` to make a copy to be passed in.

      Parameters:
        `criteria` - criteria to be split. May be modified if criteria is extracted.
        `fields` - list of fields to extract from criteria
      Returns:
        extracted criteria

    - #### supportsAdvancedCriteria

          public java.lang.Boolean supportsAdvancedCriteria()

      Do fetch and filter operations on this dataSource support being passed `AdvancedCriteria`?

      For a DataSource to support being passed AdvancedCriteria, it must be `clientOnly:true` or `cacheAllData:true`, or have server side logic which can process AdvancedCriteria objects passed from the client.

      AdvancedCriteria are supported on the server for standard `SQL`, `Hibernate` and `JPA` DataSources in Smart GWT Enterprise or Power editions (not supported in Smart GWT Pro).

      The framework assumes that custom dataSources support AdvancedCriteria; if you have a a custom DataSOurce implementation that does not support AdvancedCriteria, you can set the `allowAdvancedCriteria` property to false.

      Returns:
        true if this dataSource supports being passed AdvancedCriteria in fetch and filter type operations, false otherwise.

    - #### supportsTextMatchStyle

          public void supportsTextMatchStyle(TextMatchStyle textMatchStyle)

      Does this dataSource support the specified "textMatchStyle" when performing a filter operation against a text field.
      Parameters:
        `textMatchStyle` - textMatchStyle to check. If passed a null value, assume an exact match is being requested.

    - #### transformRequest

          protected java.lang.Object transformRequest(DSRequest dsRequest)

      For a dataSource using `client-side data integration`, return the data that should be sent to the `dataURL`.

      By default, HTTP requests sent to non-Smart GWT servers do not include DSRequest metadata such as `startRow`, `endRow`, and `oldValues`. Only the core `datasource protocol data` is sent, such as the criteria passed to `fetchData()` or the updated values submitted by `form.saveData()`.

      transformRequest() allows you to transform dsRequest metadata into a format understood by your server and include it in the HTTP request, so that you can integrate DataSource features such as data paging with servers that support such features.

      How the data is actually sent to the URL is controlled by `dataProtocol`. If using the "getParams" or "postParams" protocol, data is expected to be a JavaScript Object where each property will become a GET or POST'd parameter. If using dataProtocol:"soap" or "postXML", data will be serialized as an XML message by `DataSource.xmlSerialize`.

      As an example, if you have a dataURL that can return paged data given URL parameters "start" and "end", you could implement transformRequest like so:

              isc.DataSource.create({
                 ...
                 transformRequest : function (dsRequest) {
                    if (dsRequest.operationType == "fetch") {
                        var params = {
                           start : dsRequest.startRow,
                           end : dsRequest.endRow
                        };
                        // combine paging parameters with criteria
                        return isc.addProperties({}, dsRequest.data, params);
                    }
                 }
              });

      Other reasons to implement transformRequest():
      - transform a `Criteria` object into the custom query language of a web service
      - add a session id to requests that require authentication
      - detect colliding updates by sending both updated values and the values the user originally retrieved before editing began (available as `oldValues`)
      Special case: If the `dataProtocol` is `"clientCustom"` the Smart GWT system will not attempt to send data to the server in any way. Instead transformRequest should be implemented such that it accesses or updates the underlying data-set and calls `DataSource.processResponse` when the operation is complete. This setting allows straightforward integration with non Smart GWT comm mechanisms that directly send requests to the server (such as GWT-RPC), or handle data manipulation without sending HTTP at all (such as Google Gears).

      Note: The `RestDataSource` class overrides transformRequest() to handle xml-serializing the request (including meta data) into a standard format.

      Parameters:
        `dsRequest` - the DSRequest being processed
      Returns:
        data to be sent to the dataURL

    - #### transformResponse

          protected void transformResponse(DSResponse dsResponse,
                               DSRequest dsRequest,
                               java.lang.Object data)

      Modify the DSResponse object derived from the response returned from the `dataURL`.

      This is an override point that makes it possible to use DataSource features such as paging with web services that support such features, by allowing you to fill in metadata fields in the DSResponse object (such as `startRow`) based on service-specific metadata fields contained in the service's response.

      The DSResponse passed to this method already has `data`, which is derived differently depending on the `dataFormat` setting:

      - `dataFormat:"xml"` : either the `recordXPath` or `recordName` is used to select the XML elements that represent DataSource records. The selected XML elements are passed to `DataSource.recordsFromXML`, which transforms the XML elements to typed JavaScript data using the DataSource as a schema.
      - `dataFormat:"json"` : the `recordXPath`, if specified, is used to select records from the returned JSON data via `XMLTools.selectObjects`. `valueXPath` is used to derive correctly typed field values.
      - `dataFormat:"custom"` : `dsResponse.data` is the raw response in String form. It must be parsed into an Array of Objects for subsequent processing to work.

      In addition to `dsResponse.data`, `status` is defaulted to 0 (indicating no error), and `startRow` is assumed to be zero, with `endRow` and `totalRows` both set to `dsResponse.data.length - 1`, that is, the returned data is assumed to be all records that matched the filter criteria.

      Examples of using this API include:

      - setting `startRow`, `endRow` and `totalRows` to allow paging for a service that supports it. For example, if an XML service returns a "resultRow" tag that contained the row number of the first row of the returned results:

                 dsResponse.startRow =
                     isc.XMLTools.selectNumber(xmlData, "//resultRow");

      - setting `status` to recognized ISC error values based on service-specific errors, in order to trigger standard ISC error handling. For example, setting `dsResponse.status` to `STATUS_VALIDATION_ERROR` and filling in `errors` in order to cause validation errors to be shown in forms and grids.
      - for services that either do not return cache update data, or return partial data, using `oldValues` to create cache update data (whether this is appropriate is application-specific), or setting `invalidateCache`.

      NOTE: this method is NOT an appropriate time to call methods on visual components such as grids, initiate new DSRequests or RPCRequests, or in general do anything other than fill in fields on the DSResponse based on data that is already available. Any actions that need to be taken as a result of the web service response should be implemented exactly as for a DataSource where `transformResponse()` has not been overridden, that is, use the callback passed to high-level methods such as ``grid.fetchData()``, and do error handling via either `DataSource.handleError` or by setting `willHandleError`.

      Parameters:
        `dsResponse` - default DSResponse derived from the response data
        `dsRequest` - DSRequest object that initiated this request
        `data` - XML document or JSON objects returned by the web service

    - #### updateCaches

          public void updateCaches(DSResponse dsResponse)

      Causes any components using this DataSource to be notified of changes that have been made to the remote dataset accessed via this DataSource, as though the provided DSResponse had just successfully completed. This will cause cache managers such as `ResultSet` or `ResultTree` to automatically update their caches, and components using such cache managers to visually update to show modified data.

      This API should be used when you have found out about changes made by other users or by automatic processes. For example, using the Smart GWT `Messaging` system to receive real-time updates via HTTP streaming, you may get updates that should affect a ListGrid which is using a ResultSet to view a portion of a large dataset.

      The provided `DSResponse` should have `operationType` "update", "add" or "remove" - there is no way for a "fetch" response to meaningfully update arbitrary caches. However, if you have a list of updated records (possibly retrieved via `DataSource.fetchData`) you can call `updateCaches()` multiple times with DSResponses of type "update" formed from the list of records retrieved via `fetchData()`

      To cause all components that have cache managers to drop their caches, provide a DSResponse with `invalidateCache` set.

      As an alternative to calling `updateCaches()` directly, if updates to other DataSources occur as a result of server-side logic, you can use the server-side API DSResponse.addRelatedUpdate(DSResponse) (Pro Edition and above), which ultimately calls `updateCaches()` for you - see that method's documentation for details.

      NOTE:: this API should not be used with a `clientOnly` DataSource, because in this case, the "remote dataset" is actually within the browser. Instead, `DataSource.updateData`, addData() or removeData() can be called in order to both change the dataset stored inside the browser and notify all cache managers.

      If a DataSource has `cacheAllData` set and a full cache has been obtained, calling `updateCaches` will automatically update the cache.

      Note that the DSResponse provided to this method will not go through `DataSource.transformResponse` or other processing that would normally occur for a DSResponse resulting from a DSRequest sent by the application in this page.

      Parameters:
        `dsResponse` - the provided DSResponse must minimally have dataSource, operationType, and data set

    - #### updateCaches

          public void updateCaches(DSResponse dsResponse,
                          DSRequest dsRequest)

      Causes any components using this DataSource to be notified of changes that have been made to the remote dataset accessed via this DataSource, as though the provided DSResponse had just successfully completed. This will cause cache managers such as `ResultSet` or `ResultTree` to automatically update their caches, and components using such cache managers to visually update to show modified data.

      This API should be used when you have found out about changes made by other users or by automatic processes. For example, using the Smart GWT `Messaging` system to receive real-time updates via HTTP streaming, you may get updates that should affect a ListGrid which is using a ResultSet to view a portion of a large dataset.

      The provided `DSResponse` should have `operationType` "update", "add" or "remove" - there is no way for a "fetch" response to meaningfully update arbitrary caches. However, if you have a list of updated records (possibly retrieved via `DataSource.fetchData`) you can call `updateCaches()` multiple times with DSResponses of type "update" formed from the list of records retrieved via `fetchData()`

      To cause all components that have cache managers to drop their caches, provide a DSResponse with `invalidateCache` set.

      As an alternative to calling `updateCaches()` directly, if updates to other DataSources occur as a result of server-side logic, you can use the server-side API DSResponse.addRelatedUpdate(DSResponse) (Pro Edition and above), which ultimately calls `updateCaches()` for you - see that method's documentation for details.

      NOTE:: this API should not be used with a `clientOnly` DataSource, because in this case, the "remote dataset" is actually within the browser. Instead, `DataSource.updateData`, addData() or removeData() can be called in order to both change the dataset stored inside the browser and notify all cache managers.

      If a DataSource has `cacheAllData` set and a full cache has been obtained, calling `updateCaches` will automatically update the cache.

      Note that the DSResponse provided to this method will not go through `DataSource.transformResponse` or other processing that would normally occur for a DSResponse resulting from a DSRequest sent by the application in this page.

      Parameters:
        `dsResponse` - the provided DSResponse must minimally have dataSource, operationType, and data set
        `dsRequest` - optional dsRequest. If not specified, a DSRequest will be automatically created based on the DataSource and operationType of the DSResponse

    - #### updateData

          public void updateData(Record updatedRecord)

      Perform an "update" DataSource operation against this DataSource, to update values in an existing DataSource record.
      Parameters:
        `updatedRecord` - updated record
      See Also:
        `Operations overview and related methods`

    - #### updateData

          public void updateData(Record updatedRecord,
                        DSCallback callback)

      See Also:
        `DataSource#updateData()}`

    - #### updateData

          public void updateData(Record updatedRecord,
                        DSCallback callback,
                        DSRequest requestProperties)

      Perform an "update" DataSource operation against this DataSource, to update values in an existing DataSource record.
      Parameters:
        `updatedRecord` - updated record
        `callback` - callback to invoke on completion
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      See Also:
        `Operations overview and related methods`

    - #### validateData

          public void validateData(Record values)

      Contacts the server to run server-side validation on a DSRequest and either returns `errors` validation errors or a `status` code of 0.

      A "validate" dsRequest is effectively always `willHandleError`:true. It is a normal condition for a "validate" DSResponse to have validation errors and the response will never go to system-wide handling for unexpected errors (`RPCManager.handleError`).

      Parameters:
        `values` - record values to validate
      See Also:
        `Operations overview and related methods`

    - #### validateData

          public void validateData(Record values,
                          DSCallback callback)

      See Also:
        `DataSource#validateData()}`

    - #### validateData

          public void validateData(Record values,
                          DSCallback callback,
                          DSRequest requestProperties)

      Contacts the server to run server-side validation on a DSRequest and either returns `errors` validation errors or a `status` code of 0.

      A "validate" dsRequest is effectively always `willHandleError`:true. It is a normal condition for a "validate" DSResponse to have validation errors and the response will never go to system-wide handling for unexpected errors (`RPCManager.handleError`).

      Parameters:
        `values` - record values to validate
        `callback` - callback to invoke on completion
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      See Also:
        `Operations overview and related methods`

    - #### viewFile

          public void viewFile(Record data)

      Display a file stored in a field of type:"binary" in a new browser window.

      This will open a new browser window to show the file. Depending on the file type, the user's installed plugins and applications, and the user's browser settings, this may cause the file to be actually displayed in the new browser window, or may prompt the user to either launch an external application to view the file or save the file to disk.

      Note that if this method is called for a record with no associated file, the target window's new URL may not be functional. By default when dataSources encounter a `binary type fields`, an additional field, `<fieldName>_filename`, is generated to store the filename for the binary field value. If this field is present in the data source but has no value for this record, developers can assume they're working with a record with no stored file. If this field is not present in some custom dataSource configuration, or the record is not loaded on the client, an additional server transaction may be required to determine whether the record has an associated file before calling this method to view a file.

      See the overview of `Binary Fields` for details.

      Parameters:
        `data` - Record to download. Only required to have a value for the primary key field.

    - #### viewFile

          public void viewFile(Record data,
                      java.lang.String fieldName)

      See Also:
        `DataSource#viewFile()}`

    - #### viewFile

          public void viewFile(Record data,
                      java.lang.String fieldName,
                      DSRequest requestProperties)

      Display a file stored in a field of type:"binary" in a new browser window.

      This will open a new browser window to show the file. Depending on the file type, the user's installed plugins and applications, and the user's browser settings, this may cause the file to be actually displayed in the new browser window, or may prompt the user to either launch an external application to view the file or save the file to disk.

      Note that if this method is called for a record with no associated file, the target window's new URL may not be functional. By default when dataSources encounter a `binary type fields`, an additional field, `<fieldName>_filename`, is generated to store the filename for the binary field value. If this field is present in the data source but has no value for this record, developers can assume they're working with a record with no stored file. If this field is not present in some custom dataSource configuration, or the record is not loaded on the client, an additional server transaction may be required to determine whether the record has an associated file before calling this method to view a file.

      See the overview of `Binary Fields` for details.

      Parameters:
        `data` - Record to download. Only required to have a value for the primary key field.
        `fieldName` - optional name of the binary field containing the file. If not provided, the first binary field is used
        `requestProperties` - additional properties to set on the DSRequest that will be issued

    - #### convertCriteria

          public static AdvancedCriteria convertCriteria(Criteria criteria)

      Converts criteria expressed in Smart GWT's simple criteria format to an AdvancedCriteria object.
      Parameters:
        `criteria` - simple criteria
      Returns:
        equivalent AdvancedCriteria object

    - #### convertCriteria

          public static AdvancedCriteria convertCriteria(Criteria criteria,
                                         TextMatchStyle textMatchStyle)

      Converts criteria expressed in Smart GWT's simple criteria format to an AdvancedCriteria object.
      Parameters:
        `criteria` - simple criteria
        `textMatchStyle` - default style of matching text. Defaults to "substring"
      Returns:
        equivalent AdvancedCriteria object

    - #### copyCriteria

          public static Criteria copyCriteria(Criteria criteria)

      Create a copy of a criteria.
      Parameters:
        `criteria` - criteria to copy
      Returns:
        copy of criteria

    - #### getDataSource

          public static DataSource getDataSource(java.lang.String ID)

      Lookup a DataSource by ID.
      Parameters:
        `ID` - DataSource ID
      Returns:
        the DataSource with this ID, if loaded, otherwise null.

    - #### getSortSpecifiers

          public static java.lang.String[] getSortSpecifiers(java.lang.String[] sortBy)

      Return a an array of `SortSpecifier`s, given an array of Strings in the format expected by `sortBy`.
      Parameters:
        `sortBy` - A list of sortBy strings in the format expected by `sortBy`
      Returns:
        An array of `SortSpecifier`s equivalent to the passed in string array

    - #### onInit

          protected void onInit()

      Overrides:
        `onInit` in class `BaseClass`

    - #### registerID

          protected void registerID(java.lang.String id,
                        boolean skipUniqueJSIdentifierCheck)

      Overrides:
        `registerID` in class `BaseClass`

    - #### setID

          public void setID(java.lang.String id)

      Overrides:
        `setID` in class `BaseClass`

    - #### getPrimaryKeyFieldNames

          public java.lang.String[] getPrimaryKeyFieldNames()

      Returns a list of the names of this DataSource's `primaryKey` fields.
      Returns:
        The list of the names of this datasource's primaryKey fields
      See Also:
        `getPrimaryKeyFields()`

    - #### setAddGlobalId

          public void setAddGlobalId(java.lang.Boolean addGlobalId)
                              throws java.lang.IllegalStateException

      Whether to make this DataSource available as a global variable for convenience.

      Note : This is an advanced setting

      Parameters:
        `addGlobalId` - addGlobalId Default value is true
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getAddGlobalId

          public java.lang.Boolean getAddGlobalId()

      Whether to make this DataSource available as a global variable for convenience.
      Returns:
        Boolean

    - #### setDataProtocol

          public void setDataProtocol(DSProtocol dataProtocol)
                               throws java.lang.IllegalStateException

      Controls the format in which inputs are sent to the dataURL when fulfilling DSRequests. May be overridden for individual request types using `dataProtocol`}
      Parameters:
        `dataProtocol` - dataProtocol Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### setDefaultParams

          public void setDefaultParams(java.util.Map defaultParams)

      HTTP parameters that should be submitted with every DSRequest.
      Useful for authenticated services that require a sessionId with every request.
      Can be set for all operations of a given DataSource as DataSource.defaultParams.
      Parameters:
        `defaultParams` - the default params

    - #### getDefaultParams

          public java.util.Map getDefaultParams()

      HTTP parameters that should be submitted with every DSRequest.
      Useful for authenticated services that require a sessionId with every request.
      Can be set for all operations of a given DataSource as DataSource.defaultParams.
      Returns:
        the default params

    - #### getDataProtocol

          public DSProtocol getDataProtocol()

      Controls the format in which inputs are sent to the dataURL when fulfilling DSRequests. May be overridden for individual request types using `dataProtocol`}
      Returns:
        DSDataProtocol

    - #### get

          public static DataSource get(java.lang.String ID)

      Synonym of `DataSource.getDataSource`: Lookup a DataSource by ID.
      Parameters:
        `ID` - DataSource ID
      Returns:
        the DataSource with this ID, if loaded, otherwise null.

    - #### get

          public static DataSource get(java.lang.String ID,
                       RequestTransformer requestTransformer,
                       ResponseTransformer responseTransformer)

      Synonym of `DataSource.getDataSource`: Lookup a DataSource by ID.
      Parameters:
        `ID` - DataSource ID
        `requestTransformer` - the request transformer. Pass null to use the default transform
        `responseTransformer` - the response transformer. Pass null to use the default transform
      Returns:
        the DataSource with this ID, if loaded, otherwise null.

    - #### getDataSource

          public static DataSource getDataSource(java.lang.String ID,
                                 RequestTransformer requestTransformer,
                                 ResponseTransformer responseTransformer)

      Lookup a DataSource by ID with an optional RequestTransformer and ResponseTransformer. The RequestTransformer and ResponseTransformer parameters provide the equivalent functionality of overriding `transformRequest(DSRequest)` and `transformResponse(DSResponse, DSRequest, Object)` when instantiating a DataSource on the client. However when obtaining a DataSource instance from the server using this API, `transformRequest(DSRequest)` and `transformResponse(DSResponse, DSRequest, Object)` cannot be overridden and so the requestTransformer and responseTransformer parameters can be passed instead.
      Parameters:
        `ID` - DataSource ID
        `requestTransformer` - the request transformer. Pass null to use the default transform
        `responseTransformer` - the response transformer. Pass null to use the default transform
      Returns:
        the DataSource with this ID, if loaded, otherwise null.

    - #### useOfflineResponse

          protected boolean useOfflineResponse(DSRequest dsRequest,
                                   DSResponse dsResponse)

      Override point to allow application code to suppress use of a particular offline response. For example, application code may wish to examine the response's `offlineTimestamp` to make a decision about whether the response is too stale to be useful.

      This is an application override point only; there is no default implementation.

      Note: This is an override point

      Parameters:
        `dsRequest` - The dsRequest object
        `dsResponse` - The corresponding dsResponse object returned from offline cache
      Returns:
        true to allow this response to be used, false to prevent it

    - #### isCreated

          public boolean isCreated()

      Overrides:
        `isCreated` in class `BaseClass`

    - #### getJsObj

          public com.google.gwt.core.client.JavaScriptObject getJsObj()

      Overrides:
        `getJsObj` in class `BaseClass`

    - #### setInheritsFrom

          public void setInheritsFrom(DataSource inheritsFrom)
                               throws java.lang.IllegalStateException

      ID of another DataSource this DataSource inherits its DataSource fields from.
      Local fields (fields defined in this DataSource) are added to inherited fields to form the full set of fields. Fields with the same name are merged in the same way that databound component fields are merged with DataSource fields.
      The default order of the combined fields is new local fields first (including any fields present in the parent DataSource which the local DataSource re-declares), then parent fields. You can set `useParentFieldOrder` to instead use the parent's field order, with new local fields appearing last.

      You can set `showLocalFieldsOnly` to have all non-local fields hidden.
      Note that only fields are inherited - other properties such as dataURL and dataFormat are not. You can use ordinary inheritance, that is, creating a subclass of DataSource, in order to share properties such as dataURL across a series of DataSources that also inherit fields from each other via `inheritsFrom`
      This feature can be used for creating a customized view (eg, only certain fields shown) which will be used bymultiple databound components.adding presentation-specific attributes to metadata that has been automatically derived from `XMLTools.loadXMLSchema(String, XSDLoadCallback)` or other metadata formats modelling object subclassing and extension in server-side code and storage systems modelling relational database joins, and the equivalents in other systems creating hooks for others to customize your application in a maintainable way. For example, if you have a dataSource "employee", you can create a dataSource"customizedEmployee" which inherits from "employee" but does not initially define anyfields, and bind all databound components to"customizedEmployee". Customizations of fields (including appearance changes, fieldorder, new fields, hiding of fields, and custom validation rules) can be added to"customizedEmployee", so that they are kept separtely from the original field data and have the best possible chance of working with future versions of the "employee"dataSource.
      Parameters:
        `inheritsFrom` - the datasource to inherit from
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### setFields

          public void setFields(DataSourceField... fields)
                         throws java.lang.IllegalStateException

      The list of fields that compose records from this DataSource.

      Each DataSource field can have type, user-visible title, validators, and other metadata attached.

      Parameters:
        `fields` - fields Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### addField

          public void addField(DataSourceField field)
                        throws java.lang.IllegalStateException

      Add a field to the DataSource
      Parameters:
        `field` - the datasource field
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getFields

          public DataSourceField[] getFields()

      The list of fields that compose records from this DataSource.

      Each DataSource field can have type, user-visible title, validators, and other metadata attached.

      Returns:
        array of DataSourceFields

    - #### setRecordName

          public void setRecordName(java.lang.String recordName)
                             throws java.lang.IllegalStateException

      See `recordName`. `recordName` can be specified directly on the DataSource for a simple read-only DataSource only capable of "fetch" operations.
      Parameters:
        `recordName` - Default value is null
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### xmlSerialize

          public java.lang.String xmlSerialize(com.google.gwt.core.client.JavaScriptObject data)

      Serialize a JavaScript object as XML.

      The JavaScript Object passed to `xmlSerialize(com.google.gwt.core.client.JavaScriptObject)` becomes an XML element named after the `tagName` (or `ID` if tagName is unset). Each property of the object becomes a subElement. For example, using a DataSource to serialize like this:

               var inputObject = {
                  startRow : 5,
                  endRow : 50,
                  data : [
                     { field1 : "value1", field2: new Date() },
                     { field1 : "value3", field2: null }
                  ]
               };
               var myDS = isc.DataSource.create({ tagName:"DSRequest" });
               myDS.xmlSerialize(inputObject);

      .. produces the following XML:

               <DSRequest>
                   <startRow>5</startRow>
                   <endRow>50</endRow>
                   <data>
                       <field1>value1</field1>
                       <field2>2005-10-14T18:01:16</field2>
                   </data>
                   <data>
                       <field1>value3</field1>
                       <field2></field2>
                   </data>
               </DSRequest>

      If you are working with a WSDL-described web service, XML serialization is performed automatically by APIs like `WebService.callOperation(java.lang.String, java.util.Map, java.lang.String, com.smartgwt.client.data.WebServiceCallback)` - you only need to know about serialization in order to understand how to put together JavaScript data that will fill in an XML message properly.
      Note: when trying to send data to a web service, it is best to avoid putting together any XML yourself, instead modify the JavaScript data being fed to ISC's SOAP engine. This is because the WSDL and SOAP rules for correctly namespacing and encoding Web Service messages are very complex and are subject to change with new versions of the web service you are contacting, whereas the data itself is easy to manipulate and less likely to change.
      To troubleshoot message formation, you can set the log category "xmlComm" to `DEBUG` level in order to see the XML message formed by Smart GWT reported in log statements in the Developer Console.

      Parameters:
        `data` - data to be serialized
      Returns:
        data as serialized to XML

    - #### xmlSerialize

          public java.lang.String xmlSerialize(com.google.gwt.core.client.JavaScriptObject data,
                                      SerializationContext flags)

      Serialize a JavaScript object as XML.

      The JavaScript Object passed to `xmlSerialize(com.google.gwt.core.client.JavaScriptObject)` becomes an XML element named after the `tagName` (or `ID` if tagName is unset). Each property of the object becomes a subElement. For example, using a DataSource to serialize like this:

               var inputObject = {
                  startRow : 5,
                  endRow : 50,
                  data : [
                     { field1 : "value1", field2: new Date() },
                     { field1 : "value3", field2: null }
                  ]
               };
               var myDS = isc.DataSource.create({ tagName:"DSRequest" });
               myDS.xmlSerialize(inputObject);

      .. produces the following XML:

               <DSRequest>
                   <startRow>5</startRow>
                   <endRow>50</endRow>
                   <data>
                       <field1>value1</field1>
                       <field2>2005-10-14T18:01:16</field2>
                   </data>
                   <data>
                       <field1>value3</field1>
                       <field2></field2>
                   </data>
               </DSRequest>

      If you are working with a WSDL-described web service, XML serialization is performed automatically by APIs like `WebService.callOperation(java.lang.String, java.util.Map, java.lang.String, com.smartgwt.client.data.WebServiceCallback)` - you only need to know about serialization in order to understand how to put together JavaScript data that will fill in an XML message properly.
      Note: when trying to send data to a web service, it is best to avoid putting together any XML yourself, instead modify the JavaScript data being fed to ISC's SOAP engine. This is because the WSDL and SOAP rules for correctly namespacing and encoding Web Service messages are very complex and are subject to change with new versions of the web service you are contacting, whereas the data itself is easy to manipulate and less likely to change.
      To troubleshoot message formation, you can set the log category "xmlComm" to `DEBUG` level in order to see the XML message formed by Smart GWT reported in log statements in the Developer Console.

      Parameters:
        `data` - data to be serialized
        `flags` - options for the serialization engine
      Returns:
        data as serialized to XML

    - #### xmlSerialize

          public java.lang.String xmlSerialize(Record data,
                                      SerializationContext flags)

      Serialize a JavaScript object as XML.

      The JavaScript Object passed to `xmlSerialize(com.google.gwt.core.client.JavaScriptObject)` becomes an XML element named after the `tagName` (or `ID` if tagName is unset). Each property of the object becomes a subElement. For example, using a DataSource to serialize like this:

               var inputObject = {
                  startRow : 5,
                  endRow : 50,
                  data : [
                     { field1 : "value1", field2: new Date() },
                     { field1 : "value3", field2: null }
                  ]
               };
               var myDS = isc.DataSource.create({ tagName:"DSRequest" });
               myDS.xmlSerialize(inputObject);

      .. produces the following XML:

               <DSRequest>
                   <startRow>5</startRow>
                   <endRow>50</endRow>
                   <data>
                       <field1>value1</field1>
                       <field2>2005-10-14T18:01:16</field2>
                   </data>
                   <data>
                       <field1>value3</field1>
                       <field2></field2>
                   </data>
               </DSRequest>

      If you are working with a WSDL-described web service, XML serialization is performed automatically by APIs like `WebService.callOperation(java.lang.String, java.util.Map, java.lang.String, com.smartgwt.client.data.WebServiceCallback)` - you only need to know about serialization in order to understand how to put together JavaScript data that will fill in an XML message properly.
      Note: when trying to send data to a web service, it is best to avoid putting together any XML yourself, instead modify the JavaScript data being fed to ISC's SOAP engine. This is because the WSDL and SOAP rules for correctly namespacing and encoding Web Service messages are very complex and are subject to change with new versions of the web service you are contacting, whereas the data itself is easy to manipulate and less likely to change.
      To troubleshoot message formation, you can set the log category "xmlComm" to `DEBUG` level in order to see the XML message formed by Smart GWT reported in log statements in the Developer Console.

      Parameters:
        `data` - data to be serialized
        `flags` - options for the serialization engine
      Returns:
        data as serialized to XML

    - #### xmlSerialize

          public java.lang.String xmlSerialize(Record[] data,
                                      SerializationContext flags)

      Serialize a JavaScript object as XML.

      The JavaScript Object passed to `xmlSerialize(com.google.gwt.core.client.JavaScriptObject)` becomes an XML element named after the `tagName` (or `ID` if tagName is unset). Each property of the object becomes a subElement. For example, using a DataSource to serialize like this:

               var inputObject = {
                  startRow : 5,
                  endRow : 50,
                  data : [
                     { field1 : "value1", field2: new Date() },
                     { field1 : "value3", field2: null }
                  ]
               };
               var myDS = isc.DataSource.create({ tagName:"DSRequest" });
               myDS.xmlSerialize(inputObject);

      .. produces the following XML:

               <DSRequest>
                   <startRow>5</startRow>
                   <endRow>50</endRow>
                   <data>
                       <field1>value1</field1>
                       <field2>2005-10-14T18:01:16</field2>
                   </data>
                   <data>
                       <field1>value3</field1>
                       <field2></field2>
                   </data>
               </DSRequest>

      If you are working with a WSDL-described web service, XML serialization is performed automatically by APIs like `WebService.callOperation(java.lang.String, java.util.Map, java.lang.String, com.smartgwt.client.data.WebServiceCallback)` - you only need to know about serialization in order to understand how to put together JavaScript data that will fill in an XML message properly.
      Note: when trying to send data to a web service, it is best to avoid putting together any XML yourself, instead modify the JavaScript data being fed to ISC's SOAP engine. This is because the WSDL and SOAP rules for correctly namespacing and encoding Web Service messages are very complex and are subject to change with new versions of the web service you are contacting, whereas the data itself is easy to manipulate and less likely to change.
      To troubleshoot message formation, you can set the log category "xmlComm" to `DEBUG` level in order to see the XML message formed by Smart GWT reported in log statements in the Developer Console.

      Parameters:
        `data` - data to be serialized
        `flags` - options for the serialization engine
      Returns:
        data as serialized to XML

    - #### xmlSerialize

          public java.lang.String xmlSerialize(java.util.Map data,
                                      SerializationContext flags)

      Serialize a JavaScript object as XML.

      The JavaScript Object passed to `xmlSerialize(com.google.gwt.core.client.JavaScriptObject)` becomes an XML element named after the `tagName` (or `ID` if tagName is unset). Each property of the object becomes a subElement. For example, using a DataSource to serialize like this:

               var inputObject = {
                  startRow : 5,
                  endRow : 50,
                  data : [
                     { field1 : "value1", field2: new Date() },
                     { field1 : "value3", field2: null }
                  ]
               };
               var myDS = isc.DataSource.create({ tagName:"DSRequest" });
               myDS.xmlSerialize(inputObject);

      .. produces the following XML:

               <DSRequest>
                   <startRow>5</startRow>
                   <endRow>50</endRow>
                   <data>
                       <field1>value1</field1>
                       <field2>2005-10-14T18:01:16</field2>
                   </data>
                   <data>
                       <field1>value3</field1>
                       <field2></field2>
                   </data>
               </DSRequest>

      If you are working with a WSDL-described web service, XML serialization is performed automatically by APIs like `WebService.callOperation(java.lang.String, java.util.Map, java.lang.String, com.smartgwt.client.data.WebServiceCallback)` - you only need to know about serialization in order to understand how to put together JavaScript data that will fill in an XML message properly.
      Note: when trying to send data to a web service, it is best to avoid putting together any XML yourself, instead modify the JavaScript data being fed to ISC's SOAP engine. This is because the WSDL and SOAP rules for correctly namespacing and encoding Web Service messages are very complex and are subject to change with new versions of the web service you are contacting, whereas the data itself is easy to manipulate and less likely to change.
      To troubleshoot message formation, you can set the log category "xmlComm" to `DEBUG` level in order to see the XML message formed by Smart GWT reported in log statements in the Developer Console.

      Parameters:
        `data` - data to be serialized
        `flags` - options for the serialization engine
      Returns:
        data as serialized to XML

    - #### recordsFromXML

          public Record[] recordsFromXML(java.lang.Object elements)

      Transform a list of XML elements to DataSource records.

      recordsFromXML() will return a List of DataSource Records. The value for each field is extracted from the XML according to the rules described under `valueXPath`.

      Parameters:
        `elements` - XML elements to transform, eg, the result of a call to `XMLTools.selectNodes(Object, String)`
      Returns:
        list of DataSource records derived from the XML elements

    - #### getFieldNames

          public java.lang.String[] getFieldNames()

      Retrieves the list of fields declared on this DataSource.
      Returns:
        names of all fields declared on this DataSource, including fields that are marked hidden

    - #### getFieldNames

          public java.lang.String[] getFieldNames(boolean excludeHidden)

      Retrieves the list of fields declared on this DataSource.
      Parameters:
        `excludeHidden` - If true, returns only those fields that are not marked as hidden
      Returns:
        names of all fields declared on this DataSource

    - #### load

          public static void load(java.lang.String dsID,
                  Function callback,
                  boolean forceReload)

      Load a DataSource or an array of DataSources using the DataSourceLoader servlet. When a callback is specified, this is fired after the DataSources are loaded. If no loading occurs because the requested DataSource(s) are already loaded, a warning is logged and the callback is fired.

      To force reloading of DataSources that have already been loaded, pass `true` in the forceReload parameter.

      Parameters:
        `dsID` - DataSource ID
        `callback` - Callback to fire after DataSource loading completes
        `forceReload` - Forcibly reload a dataSource if it's already loaded

    - #### load

          public static void load(java.lang.String[] dsID,
                  Function callback,
                  boolean forceReload)

      Load a DataSource or an array of DataSources using the DataSourceLoader servlet. When a callback is specified, this is fired after the DataSources are loaded. If no loading occurs because the requested DataSource(s) are already loaded, a warning is logged and the callback is fired.

      To force reloading of DataSources that have already been loaded, pass `true` in the forceReload parameter.

      Parameters:
        `dsID` - Array of DataSource IDs
        `callback` - Callback to fire after DataSource loading completes
        `forceReload` - Forcibly reload a dataSource if it's already loaded

    - #### loadWithParents

          public static void loadWithParents(java.lang.String dsID,
                             Function callback,
                             boolean forceReload)

      Variation of `DataSource.load` that will also automatically load any DataSources that the requested DataSources inherit from (via {@link com.smartgwt.client.data.DataSource#inheritsFrom DataSource.inheritsFrom))

      If the parent DataSource is already loaded, calling loadWithParents will not automatically reload them unless the forceReload parameter is passed.

      Parameters:
        `dsID` - DataSource ID
        `callback` - Callback to fire after DataSource loading completes
        `forceReload` - Forcibly reload a dataSource if it's already loaded

    - #### loadWithParents

          public static void loadWithParents(java.lang.String[] dsID,
                             Function callback,
                             boolean forceReload)

      Variation of `DataSource.load` that will also automatically load any DataSources that the requested DataSources inherit from (via {@link com.smartgwt.client.data.DataSource#inheritsFrom DataSource.inheritsFrom))

      If the parent DataSource is already loaded, calling loadWithParents will not automatically reload them unless the forceReload parameter is passed.

      Parameters:
        `dsID` - DataSource ID
        `callback` - Callback to fire after DataSource loading completes
        `forceReload` - Forcibly reload a dataSource if it's already loaded

    - #### getSortBy

          public static java.lang.String[] getSortBy(java.lang.String[] sortSpecifiers)

      Given an array of ${isc.DocUtils.linkForRef('object:SortSpecifier')}s, return a simple list of Strings in the format expected by `sortBy`.
      Parameters:
        `sortSpecifiers` - The list of specifiers to return in sortBy format
      Returns:
        An array of sort-definitions in the format expected by `sortBy`

    - #### exportClientData

          public void exportClientData(java.lang.Object[] data,
                              DSRequest requestProperties)

      Exports arbitrary client-side data, with client-side formatters applied, so is suitable for direct display to users. This method can be used to export data formatted outside of any kind of visual component.

      If you do not specify an `operationId` in the `requestProperties` you pass to this method, it behaves exactly the same as the `exportClientDataStatic` static classMethod. If you do specify an `operationId`, the framework expects your DataSource to configure an `OperationBinding` of `operationType` `DSOperationType.CLIENTEXPORT`, with the same `operationId`. The framework will then send the `exportClientData` request via the ordinary `DSRequest` mechanism, which allows you to use normal framework features in the client data export. For example, you could add a `DMI declaration` to your `operationBinding`, which would allow you to write server-side code that intervenes in the export process - for instance, by calling the `getExportObject()` API to do something special with the export document, like saving it to a database table or sending it to an email list.

      When you use the specific `operationId` version of this API, both the SmartClient Server and server-side DataSources are required.

      To export unformatted data, see `exportData()` which does not include client-side formatters, but requires both the Smart GWT server and the presence of server-side DataSources.

      Parameters:
        `data` - Records to export, similar to ListGrid.data
        `requestProperties` - Request properties for the export

    - #### exportClientDataStatic

          public static void exportClientDataStatic(java.lang.Object[] data,
                                    DSRequest requestProperties)

      Exports arbitrary client-side data, with client-side formatters applied, so is suitable for direct display to users. This method can be used to export data formatted outside of any kind of visual component.

      Requires the SmartClient server, but does not rely on any server-side DataSources. If you need to intervene in the export process server-side - for example, if you need to do something not directly supported with the exported object, such as attach it to an email - use the `exportClientData` instance method with an appropriate `OperationBinding`, as described in the method documentation.

      To export unformatted data, see `exportData()`, which does not include client-side formatters, but requires both the SmartClient server and the presence of server-side DataSources.

      Note that field `displayFormat` is honored for "date" and "datetime" fields when exporting direct to Excel; see the displayFormat docs for details.

      NOTE: The "Static" in this method name merely indicates that it is the static version of this method, as opposed to the similar instance method `exportClientData`. Restrictions of the Java language itself prevent us from giving the instance method and the static method the same name.

    - #### getFileURL

          public java.lang.String getFileURL(Record data)

      Returns a direct URL to access a file stored in a field of type:"binary".

      This URL as be used as the "src" attribute of an Img widget or <img> tag (if the file is an image), or can be used in an ordinary HTML link (<a> tag) to download the file. However, for the latter use case, see also `DataSource.downloadFile` and `DataSource.viewFile`.

      The URL returned is not to a static file on disk, rather, the returned URL essentially encodes a DSRequest as URL parameters, in a format understood by the IDACall servlet that comes with the Server Framework.

      Hence, this URL will dynamically retrieve whatever file is currently stored in the binary field via executing a normal DSRequest server side. The request will run through normal security checks, so if your application requires authentication, the user must have a valid session and be authorized to access the binary field.

      Similarly, accessing this URL has the same performance as using `DataSource.downloadFile`.

      Parameters:
        `data` - Record or value of primary key field for record containing the file to view.
      Returns:
        a URL to directly access the stored file

    - #### getFileURL

          public java.lang.String getFileURL(Record data,
                                    java.lang.String fieldName)

      Returns a direct URL to access a file stored in a field of type:"binary".

      This URL as be used as the "src" attribute of an Img widget or <img> tag (if the file is an image), or can be used in an ordinary HTML link (<a> tag) to download the file. However, for the latter use case, see also `DataSource.downloadFile` and `DataSource.viewFile`.

      The URL returned is not to a static file on disk, rather, the returned URL essentially encodes a DSRequest as URL parameters, in a format understood by the IDACall servlet that comes with the Server Framework.

      Hence, this URL will dynamically retrieve whatever file is currently stored in the binary field via executing a normal DSRequest server side. The request will run through normal security checks, so if your application requires authentication, the user must have a valid session and be authorized to access the binary field.

      Similarly, accessing this URL has the same performance as using `DataSource.downloadFile`.

      Parameters:
        `data` - Record or value of primary key field for record containing the file to view.
        `fieldName` - optional name of the binary field containing the file. If not provided, the first binary field is used
      Returns:
        a URL to directly access the stored file

    - #### getFileURL

          public java.lang.String getFileURL(Record data,
                                    java.lang.String fieldName,
                                    DSRequest requestProperties)

      Returns a direct URL to access a file stored in a field of type:"binary".

      This URL as be used as the "src" attribute of an Img widget or <img> tag (if the file is an image), or can be used in an ordinary HTML link (<a> tag) to download the file. However, for the latter use case, see also `DataSource.downloadFile` and `DataSource.viewFile`.

      The URL returned is not to a static file on disk, rather, the returned URL essentially encodes a DSRequest as URL parameters, in a format understood by the IDACall servlet that comes with the Server Framework.

      Hence, this URL will dynamically retrieve whatever file is currently stored in the binary field via executing a normal DSRequest server side. The request will run through normal security checks, so if your application requires authentication, the user must have a valid session and be authorized to access the binary field.

      Similarly, accessing this URL has the same performance as using `DataSource.downloadFile`.

      Parameters:
        `data` - Record or value of primary key field for record containing the file to view.
        `fieldName` - optional name of the binary field containing the file. If not provided, the first binary field is used
        `requestProperties` - additional properties to set on the DSRequest that will be issued
      Returns:
        a URL to directly access the stored file

    - #### setXmlNamespaces

          public void setXmlNamespaces(XmlNamespaces xmlNamespaces)
                                throws java.lang.IllegalStateException

      Optional object declaring namespace prefixes for use in OperationBinding.recordXPath and DataSourceField.valueXPath XPath expressions. xmlNamespaces should be specified as a map ping from namespace prefix to namespace URI, for example:

      xmlNamespaces : { az : "http://webservices.amazon.com/AWSECommerceService/2005-03-23" }
      By default, all namespaces declared on the document element (outermost element of the response) are made available with the prefix used in the document itself. Then, for non-WSDL-described XML results, if there i s a default namespace on the document element, it is made available with the special prefix "default".

      For results of WSDL-described operations, the prefix "service" means the service namespa ce, that is, the "targetNamespace" on the element from the WSDL file. The prefix "schema" means the names pace of the outermost element in the output message for the current operation. "default" will be the schema na mespace if there is one, otherwise the service namespace.
      For basic information on XML Namespaces and their use in XPath, try the following search: http://www.google.com/search?q=XPath+xml+namespaces
      Parameters:
        `xmlNamespaces` - xml namespaces
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying compo nent has been created

    - #### setTypeOperators

          public void setTypeOperators(FieldType fieldType,
                              OperatorId[] operators)

      Set the list of `OperatorIds` valid for a given FieldType.
      Parameters:
        `fieldType` - the field type
        `operators` - available Operators

    - #### getTypeOperators

          public OperatorId[] getTypeOperators(FieldType fieldType)

      Get the list of OperatorIds available on this DataSource for the given FieldType.

      If DataSource.setTypeOperators() has been called for this DataSource and Fieldtype, returns that list, otherwise, returns the set of valid operators for the FieldType as specified by SimpleType.validOperators, otherwise, the system-wide set of valid operators for the type as registered via DataSource.addSearchOperator().

      Parameters:
        `fieldType` - the field type
      Returns:
        the available Operators

    - #### getFieldOperators

          public OperatorId[] getFieldOperators(java.lang.String fieldName)

      Get the list of OperatorId's available for this field. By default if the validOperators is set on the DataSourceField, it returns the list, otherwise returns the result of `getTypeOperators(com.smartgwt.client.types.FieldType)`.
      Parameters:
        `fieldName` - the field name to obtain operators for
      Returns:
        the available Operators

    - #### getFieldOperators

          public OperatorId[] getFieldOperators(DataSourceField field)

      Get the list of OperatorId's available for this field. By default if the validOperators is set on the DataSourceField, it returns the list, otherwise returns the result of `getTypeOperators(com.smartgwt.client.types.FieldType)`.
      Parameters:
        `field` - the field to obtain operators for
      Returns:
        the available Operators

    - #### combineCriteria

          public static Criteria combineCriteria(Criteria criteria1,
                                 Criteria criteria2)

      Combines two criteria (either simple criteria objects or AdvancedCriteria) using the "outerOperator". Note that the combined criteria object will be an AdvancedCriteria unless:
      - both input criteria objects are simple, and
      - the "outerOperator" is "and", and
      - there is no collision of key names on the two criteria
      Parameters:
        `criteria1` - first criteria object
        `criteria2` - second criteria object
      Returns:
        The combined criteria
      See Also:
        Dynamic Reporting Example

    - #### combineCriteria

          public static Criteria combineCriteria(Criteria criteria1,
                                 Criteria criteria2,
                                 CriteriaCombineOperator outerOperator)

      Combines two criteria (either simple criteria objects or AdvancedCriteria) using the "outerOperator". Note that the combined criteria object will be an AdvancedCriteria unless:
      - both input criteria objects are simple, and
      - the "outerOperator" is "and", and
      - there is no collision of key names on the two criteria
      Parameters:
        `criteria1` - first criteria object
        `criteria2` - second criteria object
        `outerOperator` - operator to use to combine the criteria. Defaults to "and"
      Returns:
        The combined criteria
      See Also:
        Dynamic Reporting Example

    - #### combineCriteria

          public static Criteria combineCriteria(Criteria criteria1,
                                 Criteria criteria2,
                                 CriteriaCombineOperator outerOperator,
                                 TextMatchStyle textMatchStyle)

      Combines two criteria (either simple criteria objects or AdvancedCriteria) using the "outerOperator". Note that the combined criteria object will be an AdvancedCriteria unless:
      - both input criteria objects are simple, and
      - the "outerOperator" is "and", and
      - there is no collision of key names on the two criteria
      Parameters:
        `criteria1` - first criteria object
        `criteria2` - second criteria object
        `outerOperator` - operator to use to combine the criteria. Defaults to "and"
        `textMatchStyle` - style of matching text, if it is necessary to convert a simple criteria object to an AdvancedCriteria. Defaults to "substring"
      Returns:
        The combined criteria
      See Also:
        Dynamic Reporting Example

    - #### applyFilter

          public Record[] applyFilter(Record[] records,
                             Criteria criteria,
                             DSRequest requestProperties)

      Returns records in the passed Record that match the provided filter `Criteria`.

      By default:

      - any criteria that do not correspond to a DataSource field are ignored
      - any null or empty string criteria are ignored
      Parameters:
        `records` - (Record[]) the list of rows
        `criteria` - (Criteria) the filter criteria
        `requestProperties` - (DSRequest Properties) optional dataSource request properties
      Returns:
        Record[] the list of matching rows

    - #### applyFilter

          public Record[] applyFilter(Record[] records,
                             Criteria criteria)

      Returns records in the passed Record that match the provided filter `Criteria`.

      By default:

      - any criteria that do not correspond to a DataSource field are ignored
      - any null or empty string criteria are ignored
      Parameters:
        `records` - (Record[]) the list of rows
        `criteria` - (Criteria) the filter criteria
      Returns:
        Record[] the list of matching rows

    - #### recordsAsText

          public java.lang.String recordsAsText(Record[] records)

      Converts a list of Records to simple text formats with a Record per line and values separated by a configurable separator, including both tab-separated-values and comma-separated-values (aka CSV).

      In addition to the `settings` parameter for this method, `DataSourceField.exportForceText` can be set.

      If two or more different text exports are needed for the same DataSource creating a conflict for any DataSourceField setting, `inheritsFrom` can be used to create a child DataSource where these settings can be changed without recapitulating all field definitions.

      Parameters:
        `records` - records to convert
      Returns:
        records as CSV/TSV (separator can be specified)

    - #### recordsAsText

          public java.lang.String recordsAsText(Record[] records,
                                       TextExportSettings settings)

      Converts a list of Records to simple text formats with a Record per line and values separated by a configurable separator, including both tab-separated-values and comma-separated-values (aka CSV).

      In addition to the `settings` parameter for this method, `DataSourceField.exportForceText` can be set.

      If two or more different text exports are needed for the same DataSource creating a conflict for any DataSourceField setting, `inheritsFrom` can be used to create a child DataSource where these settings can be changed without recapitulating all field definitions.

      Parameters:
        `records` - records to convert
        `settings` - settings for the export
      Returns:
        records as CSV/TSV (separator can be specified)

    - #### recordsFromText

          public Record[] recordsFromText(java.lang.String text)

      Derive a set of Records from Microsoft Excel-compatible tab-separated-values format, using the current DataSource field order, or an explicitly specified list of fields.

      If a specified field does not exist in the DataSource, it's assumed the values for that field should end up as Strings.

      Parameters:
        `text` - records as CSV/TSV (separator can be specified)
      Returns:
        records derived from TSV

    - #### recordsFromText

          public Record[] recordsFromText(java.lang.String text,
                                 TextImportSettings settings)

      Derive a set of Records from Microsoft Excel-compatible tab-separated-values format, using the current DataSource field order, or an explicitly specified list of fields.

      If a specified field does not exist in the DataSource, it's assumed the values for that field should end up as Strings.

      Parameters:
        `text` - records as CSV/TSV (separator can be specified)
        `settings` - optional settings for the
      Returns:
        records derived from TSV

    - #### setCacheData

          public void setCacheData(Record... cacheData)

      For a `cacheAllData` or client-only DataSource, a set of records to use as a dataset, specified as an Array of JavaScript Objects representing records.
      If this method is called after the component has been drawn/initialized: Call this method to set the data in the client-side cache after initialization.
      Parameters:
        `cacheData` - Array of records to apply as the client-side cache. Default value is null

    - #### getCacheData

          public Record[] getCacheData()

      For a `cacheAllData` or client-only DataSource, a set of records to use as a dataset, specified as an Array of JavaScript Objects representing records.
      Returns:
        Returns the complete set of data cached by this dataSource. Note that this may have been supplied via `cacheData`, or may have been fetched from the server for dataSources with `cacheAllData` set to true.

    - #### setTestData

          public void setTestData(Record... cacheData)

      For a client-only DataSource, a set of records to use as a dataset, specified as an Array of JavaScript Objects. Deprecated in favor of `cacheData`.

      See `this discussion` for ways to populate a client-only DataSource with test data.
      If this method is called after the component has been drawn/initialized: Call this method to set the data in the client-side test-data after initialization. `setCacheData()` should be called instead and setTestData() is deprecated and will eventually be removed.

      Parameters:
        `testData` - Array of records to apply as the client-side test-data. Default value is null

    - #### getTestData

          public Record[] getTestData()

      For a client-only DataSource, a set of records to use as a dataset, specified as an Array of JavaScript Objects. Deprecated in favor of `cacheData`.

      See `this discussion` for ways to populate a client-only DataSource with test data.

      Returns:
        Record

    - #### getFieldAutoTitle

          public java.lang.String getFieldAutoTitle(java.lang.String identifier)

      Return a reasonable user-visible title given a fieldName. Called when `autoDeriveTitles` is true and by default, calls the class method `DataSource.getAutoTitle`. Override to provide a different policy for auto-deriving titles for a particular DataSource or subclass of DataSource.
      Parameters:
        `identifier` - identifier for which a title is desired.
      Returns:
        auto-derived title

    - #### getAutoTitle

          public static java.lang.String getAutoTitle(java.lang.String identifier)

      Utility method to derive a reasonable user-visible title from an identifier.

      The following approach is taken:

      - any underscores (_) or dollar signs ($) become spaces, except that there will never be either a leading or trailing space.
      - if the fieldName is either entirely uppercase or lowercase, all words separated by spaces are given a leading capital letter. Example USER_NAME or user_name -> "User Name".
      - if there is any use of mixed case, camelCaps convention is assumed, and the field name is split into separate words based on 1) everywhere an uppercase letter appears after a lowercase letter 2) everywhere a series of uppercase letters ends. Letter case will not be modified, with the exception that the first word will have its first letter capitalized. Example: useHTTPProxy -> "Use HTTP Proxy"
      Parameters:
        `identifier` - identifier for which a title is desired.
      Returns:
        auto-derived title

    - #### getFieldValue

          public static java.lang.Object getFieldValue(DataSourceField field,
                                       Record record)

      Given a field definition and a record object, this method will return the field value for the record.

      This method will follow any `dataPath` specified on the component field if necessary, and will extract `atomic values` from custom `SimpleType` fields where this is required.

      Parameters:
        `field` - Field definition from a dataSource or dataBoundComponent.
        `record` - data object
      Returns:
        extracted field value

    - #### getFieldValue

          public static java.lang.Object getFieldValue(ListGridField field,
                                       Record record)

      Given a field definition and a record object, this method will return the field value for the record.

      This method will follow any `dataPath` specified on the component field if necessary, and will extract `atomic values` from custom `SimpleType` fields where this is required.

      Parameters:
        `field` - Field definition from a dataSource or dataBoundComponent.
        `record` - data object
      Returns:
        extracted field value

    - #### getFieldValue

          public static java.lang.Object getFieldValue(DetailViewerField field,
                                       Record record)

      Given a field definition and a record object, this method will return the field value for the record.

      This method will follow any `dataPath` specified on the component field if necessary, and will extract `atomic values` from custom `SimpleType` fields where this is required.

      Parameters:
        `field` - Field definition from a dataSource or dataBoundComponent.
        `record` - data object
      Returns:
        extracted field value

    - #### getFieldValue

          public static java.lang.Object getFieldValue(FormItem field,
                                       Record record)

      Given a field definition and a record object, this method will return the field value for the record.

      This method will follow any `dataPath` specified on the component field if necessary, and will extract `atomic values` from custom `SimpleType` fields where this is required.

      Parameters:
        `field` - Field definition from a dataSource or dataBoundComponent.
        `record` - data object
      Returns:
        extracted field value