com.smartgwt.client.data

## Class DSRequest

- java.lang.Object
- - com.smartgwt.client.core.JsObject
  - - com.smartgwt.client.core.DataClass
    - - com.smartgwt.client.rpc.RPCRequest
      - - com.smartgwt.client.data.DSRequest

- All Implemented Interfaces:
    com.google.gwt.event.shared.HasHandlers

      public class DSRequest
      extends RPCRequest

  Request sent to the server to initiate a `DataSource operation`. All properties which are legal on `RPCRequest` are legal, in addition to the properties listed here.
  See Also:
    `RPCRequest`

- - ### Field Summary

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

      `factoryCreated, factoryProperties`

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

      `jsObj`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DSRequest()`
    `DSRequest(DSOperationType operationType)`
    `DSRequest(DSOperationType operationType, Criteria criteria)`
    `DSRequest(DSOperationType operationType, com.google.gwt.core.client.JavaScriptObject data)`
    `DSRequest(DSOperationType operationType, Record data)`
    `DSRequest(DSOperationType operationType, java.lang.String operationId)`
    `DSRequest(DSOperationType operationType, java.lang.String operationId, Criteria criteria)`
    `DSRequest(DSOperationType operationType, java.lang.String operationId, com.google.gwt.core.client.JavaScriptObject data)`
    `DSRequest(DSOperationType operationType, java.lang.String operationId, Record data)`
    `DSRequest(com.google.gwt.core.client.JavaScriptObject jsObj)`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.lang.String` | `getAdditionalOutputs()` For fetch, add or update operation, an optional comma separated list of fields to fetch from another, related DataSource.
    `java.lang.String` | `getComponentId()` For requests submitted by a `DataBoundComponent`, the `Canvas.ID` of the submitting component.
    `Criteria` | `getCriteria()` Return the Criteria associated with a FETCH operation.
    `DSProtocol` | `getDataProtocol()` `DataProtocol` for this particular request.
    `java.lang.String` | `getDataSource()` DataSource this DSRequest will act on.
    `java.lang.Integer` | `getEndRow()` End row of requested results, used only with fetch operations.
    `ExportFormat` | `getExportAs()` The format in which the data should be exported.
    `java.lang.String` | `getExportCSS()` When using `RPCManager.exportContent()` to produce a .pdf from a Smart GWT UI, this property allows dynamic CSS to be passed to the server.
    `Record[]` | `getExportData()` Only applies to request properties passed to `ListGrid.exportClientData()`.
    `java.lang.Boolean` | `getExportDatesAsFormattedString()` When exporting via `ListGrid.exportClientData()` to an `XLS` or `OOXML` spreadsheet, forces dates to export as a string rather than a true date value.
    `java.lang.String` | `getExportDelimiter()` The character to use as a field-separator in CSV exports.
    `ExportDisplay` | `getExportDisplay()` Specifies whether the exported data will be downloaded as an attachment or displayed in a new browser window.
    `java.lang.String[]` | `getExportFields()` The list of field names to export.
    `java.lang.String` | `getExportFilename()` The name of the file to save the exported data into.
    `java.lang.String` | `getExportFooter()` Optional text to appear at the end of the file.
    `java.lang.String` | `getExportHeader()` Optional text to appear at the beginning of the file.
    `java.lang.Boolean` | `getExportHeaderless()` This property allows omitting column names from CSV and Excel exports (no effect on JSON or XML exports).
    `ExportImageFormat` | `getExportImageFormat()` The image format in which the SVG graphic should be exported.
    `java.lang.Float` | `getExportImageQuality()` Deprecated. `GwtFloatVsDouble`
    `java.lang.Double` | `getExportImageQualityAsDouble()` If exporting in `JPEG format`, the output JPEG quality level.
    `java.lang.String` | `getExportPath()` If `exportToFilesystem` is set, optionally specifies a path to use when saving the file.
    `PropertyIdentifier` | `getExportPropertyIdentifier()` Determines the `PropertyIdentifier` to be used in the exported data.
    `java.lang.Boolean` | `getExportRawValues()` Whether formatting settings should be applied to data being exported.
    `java.lang.Boolean` | `getExportResults()` When set, causes the results of the DSRequest to be exported to a file, whose name and format are indicated by `exportFilename` and `exportAs` respectively.
    `java.lang.Boolean` | `getExportShowHeaderSpanTitles()` When you erxport a `ListGrid` that has `headerSpans`, should headerSpans also be exported.
    `java.lang.String` | `getExportSpanTitleSeparator()` When you export a `ListGrid` that has `headerSpans` defined and `exportShowHeaderSpanTitles` is true, the behavior is dependent on the export type.
    `boolean` | `getExportStreaming()` When exporting to OOXML format (this is the standard file format used by Excel 2007 and later), we default to using streaming mode, for memory efficiency.
    `java.lang.String` | `getExportTitleSeparatorChar()` The character with which to replace spaces in field-titles when exporting to XML.
    `java.lang.Boolean` | `getExportToClient()` If set, Smart GWT Server will export data back to the client, either as a file download or as content in a new browser window, depending on the setting of `exportDisplay`.
    `java.lang.Boolean` | `getExportToFilesystem()` If set, Smart GWT Server will export data to a file on the server filesystem.
    `java.lang.String` | `getExportTZ()` For server-side export with `ExportFormat` "xls" or "ooxml" only, timezone to use when saving values from `FieldType` "datetime" to the spreadsheet.
    `java.lang.Boolean` | `getExportValueFields()` This flag has a different meaning depending on whether you are doing a client-driven or server-driven export.
    `java.util.Map` | `getFieldValueExpressions()` A set of key:value pairs, mapping field names to expressions that will be evaluated server-side to derive a value for that field.
    `java.lang.Boolean` | `getGenerateRelatedUpdates()` Specifies should related updates have to be generated.
    `java.lang.String[]` | `getGroupBy()` List of fields to group by when using `server-side summarization`.
    `java.util.Map` | `getHeaderData()` For DataSources using SOAP messaging with a WSDL web service, data to be serialized to form SOAP headers, as a map from the header part name to the data.
    `java.lang.Boolean` | `getKeepParentsOnFilter()` This property is for advanced use in integrating trees that `load data on demand` using data paging.
    `java.lang.String` | `getLineBreakStyle()` The style of line-breaks to use in the exported output.
    `Record` | `getOldValues()` For an `update` or `remove` operation, the original values from the record that is being updated or removed.
    `java.lang.String` | `getOperationId()` When a `DataBoundComponent` sends a DSRequest, the `dsRequest.operationId` will be automatically picked up from the `fetchOperation`, `addOperation`, etc properties of the DataBoundComponent.
    `DSOperationType` | `getOperationType()` Type of operation being performed: "fetch", "add", "remove", "update" or "custom".
    `static DSRequest` | `getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)`
    `java.lang.String` | `getOutputs()` The list of fields to return in the response, specified as a comma-separated string (eg, `"foo, bar, baz"`).
    `TreeNode` | `getParentNode()` For advanced use in integrating trees that `load data on demand` with web services, `parentNode` is automatically set in "fetch" DSRequests issued by a databound TreeGrid that is loading children for that `parentNode`.
    `java.lang.Boolean` | `getPendingAdd()` Indicates that a validation request is being made for a record that will ultimately be saved with an "add" request, as opposed to an "update" request.
    `java.lang.Boolean` | `getProgressiveLoading()` Sets `progressive loading mode` for this specific request, overriding the OperationBinding- and DataSource-level settings.
    `java.lang.String` | `getRequestId()` Automatically generated unique ID for this request.
    `ResultSet` | `getResultSet()` For advanced use in integrating dataset paging with web services, the ResultSet that issued this "fetch" DSRequest is automatically made available as the `resultSet` property.
    `ResultTree` | `getResultTree()` For advanced use in integrating trees that `load data on demand` with web services, the ResultTree that issued this "fetch" DSRequest is automatically made available as the `resultTree` property.
    `java.lang.Boolean` | `getShouldUseCache()` This is a per-request flag for explicitly controlling whether the cache is used (bypassing it when not wanted, or using it when settings would indicate otherwise).
    `SortSpecifier[]` | `getSortBy()` Fieldname to sortBy
    `java.lang.Integer` | `getStartRow()` Starting row of requested results, used only with fetch operations.
    `boolean` | `getStreamResults()` If true, results will be streamed on the server, rather than all records being read into server memory at once; this approach is appropriate for retrieving or exporting large datasets without swamping the server.
    `java.util.Map<java.lang.String,SummaryFunctionType>` | `getSummaryFunctions()` A mapping from field names to summary functions to be applied to each field.
    `TextMatchStyle` | `getTextMatchStyle()` For "fetch" operations, how search criteria should be interpreted for text fields: one of "exact" for exact match, "exactCase" for case-sensitive exact match, "startsWith" for matching at the beginning only, or "substring" for substring match.
    `java.lang.Boolean` | `getUseFlatFields()` When `useFlatFields` is set for a request to be sent to a WSDL web service, when creating the input XML message to send to the web service, properties in `request.data` will be used as the values for XML elements of the same name, at any level of nesting.
    `java.lang.Boolean` | `getUseFlatHeaderFields()` Cause the `useFlatFields` XML serialization behavior to be used for all soap headers in the request.
    `java.lang.Boolean` | `getUseStrictJSON()` Should the HTTP response to this request 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.
    `ValidationMode` | `getValidationMode()` Mode of validation for entered data.
    `void` | `setAdditionalOutputs(java.lang.String additionalOutputs)` For fetch, add or update operation, an optional comma separated list of fields to fetch from another, related DataSource.
    `void` | `setAttribute(java.lang.String property, java.lang.Object value)` Set a custom attribute value on the DSRequest as an Object.
    `void` | `setCallback(DSCallback callback)`
    `void` | `setComponentId(java.lang.String componentId)` For requests submitted by a `DataBoundComponent`, the `Canvas.ID` of the submitting component.
    `void` | `setCriteria(Criteria criteria)` This method applies to "fetch" requests only; for update or delete operations pass a Record to setData() which contains primaryKey values as Record attributes.
    `void` | `setDataProtocol(DSProtocol dataProtocol)` `DataProtocol` for this particular request.
    `void` | `setDataSource(java.lang.String dataSource)` DataSource this DSRequest will act on.
    `void` | `setEndRow(java.lang.Integer endRow)` End row of requested results, used only with fetch operations.
    `void` | `setExportAs(ExportFormat exportAs)` The format in which the data should be exported.
    `void` | `setExportCSS(java.lang.String exportCSS)` When using `RPCManager.exportContent()` to produce a .pdf from a Smart GWT UI, this property allows dynamic CSS to be passed to the server.
    `void` | `setExportData(Record... exportData)` Only applies to request properties passed to `ListGrid.exportClientData()`.
    `void` | `setExportDatesAsFormattedString(java.lang.Boolean exportDatesAsFormattedString)` When exporting via `ListGrid.exportClientData()` to an `XLS` or `OOXML` spreadsheet, forces dates to export as a string rather than a true date value.
    `void` | `setExportDelimiter(java.lang.String exportDelimiter)` The character to use as a field-separator in CSV exports.
    `void` | `setExportDisplay(ExportDisplay exportDisplay)` Specifies whether the exported data will be downloaded as an attachment or displayed in a new browser window.
    `void` | `setExportFields(java.lang.String... exportFields)` The list of field names to export.
    `void` | `setExportFilename(java.lang.String exportFilename)` The name of the file to save the exported data into.
    `void` | `setExportFooter(java.lang.String exportFooter)` Optional text to appear at the end of the file.
    `void` | `setExportHeader(java.lang.String exportHeader)` Optional text to appear at the beginning of the file.
    `void` | `setExportHeaderless(java.lang.Boolean exportHeaderless)` This property allows omitting column names from CSV and Excel exports (no effect on JSON or XML exports).
    `void` | `setExportImageFormat(ExportImageFormat exportImageFormat)` The image format in which the SVG graphic should be exported.
    `void` | `setExportImageQuality(java.lang.Double exportImageQuality)` If exporting in `JPEG format`, the output JPEG quality level.
    `void` | `setExportImageQuality(java.lang.Float exportImageQuality)` Deprecated. `GwtFloatVsDouble`
    `void` | `setExportPath(java.lang.String exportPath)` If `exportToFilesystem` is set, optionally specifies a path to use when saving the file.
    `void` | `setExportPropertyIdentifier(PropertyIdentifier exportPropertyIdentifier)` Determines the `PropertyIdentifier` to be used in the exported data.
    `void` | `setExportRawValues(java.lang.Boolean exportRawValues)` Whether formatting settings should be applied to data being exported.
    `void` | `setExportResults(java.lang.Boolean exportResults)` When set, causes the results of the DSRequest to be exported to a file, whose name and format are indicated by `exportFilename` and `exportAs` respectively.
    `void` | `setExportShowHeaderSpanTitles(java.lang.Boolean exportShowHeaderSpanTitles)` When you erxport a `ListGrid` that has `headerSpans`, should headerSpans also be exported.
    `void` | `setExportSpanTitleSeparator(java.lang.String exportSpanTitleSeparator)` When you export a `ListGrid` that has `headerSpans` defined and `exportShowHeaderSpanTitles` is true, the behavior is dependent on the export type.
    `void` | `setExportStreaming(boolean exportStreaming)` When exporting to OOXML format (this is the standard file format used by Excel 2007 and later), we default to using streaming mode, for memory efficiency.
    `void` | `setExportTitleSeparatorChar(java.lang.String exportTitleSeparatorChar)` The character with which to replace spaces in field-titles when exporting to XML.
    `void` | `setExportToClient(java.lang.Boolean exportToClient)` If set, Smart GWT Server will export data back to the client, either as a file download or as content in a new browser window, depending on the setting of `exportDisplay`.
    `void` | `setExportToFilesystem(java.lang.Boolean exportToFilesystem)` If set, Smart GWT Server will export data to a file on the server filesystem.
    `void` | `setExportTZ(java.lang.String exportTZ)` For server-side export with `ExportFormat` "xls" or "ooxml" only, timezone to use when saving values from `FieldType` "datetime" to the spreadsheet.
    `void` | `setExportValueFields(java.lang.Boolean exportValueFields)` This flag has a different meaning depending on whether you are doing a client-driven or server-driven export.
    `void` | `setFieldValueExpressions(java.util.Map fieldValueExpressions)` A set of key:value pairs, mapping field names to expressions that will be evaluated server-side to derive a value for that field.
    `void` | `setGenerateRelatedUpdates(java.lang.Boolean generateRelatedUpdates)` Specifies should related updates have to be generated.
    `void` | `setGroupBy(java.lang.String... groupBy)` List of fields to group by when using `server-side summarization`.
    `void` | `setHeaderData(java.util.Map headerData)` For DataSources using SOAP messaging with a WSDL web service, data to be serialized to form SOAP headers, as a map from the header part name to the data.
    `void` | `setKeepParentsOnFilter(java.lang.Boolean keepParentsOnFilter)` This property is for advanced use in integrating trees that `load data on demand` using data paging.
    `void` | `setLineBreakStyle(java.lang.String lineBreakStyle)` The style of line-breaks to use in the exported output.
    `void` | `setOldValues(com.google.gwt.core.client.JavaScriptObject oldValues)` For an `update` or `remove` operation, the original values from the record that is being updated or removed.
    `void` | `setOldValues(java.util.Map oldValues)` For an `update` or `remove` operation, the original values from the record that is being updated or removed.
    `void` | `setOldValues(Record oldValues)` For an `update` or `remove` operation, the original values from the record that is being updated or removed.
    `void` | `setOperationId(java.lang.String operationId)` When a `DataBoundComponent` sends a DSRequest, the `dsRequest.operationId` will be automatically picked up from the `fetchOperation`, `addOperation`, etc properties of the DataBoundComponent.
    `void` | `setOperationType(DSOperationType operationType)` Type of operation being performed: "fetch", "add", "remove", "update" or "custom".
    `void` | `setOutputs(java.lang.String outputs)` The list of fields to return in the response, specified as a comma-separated string (eg, `"foo, bar, baz"`).
    `void` | `setParams(java.util.Map params)` Values to be sent as simple HTTP params, as a JavaScript Object where each property/value pair will become an HTTP parameter name and value.
    `void` | `setPendingAdd(java.lang.Boolean pendingAdd)` Indicates that a validation request is being made for a record that will ultimately be saved with an "add" request, as opposed to an "update" request.
    `void` | `setProgressiveLoading(java.lang.Boolean progressiveLoading)` Sets `progressive loading mode` for this specific request, overriding the OperationBinding- and DataSource-level settings.
    `void` | `setShouldUseCache(java.lang.Boolean shouldUseCache)` This is a per-request flag for explicitly controlling whether the cache is used (bypassing it when not wanted, or using it when settings would indicate otherwise).
    `void` | `setSkinName(java.lang.String skinName)` Set the skin to use.
    `void` | `setSortBy(SortSpecifier[] sortSpecifiers)` Fieldnames to sortBy.
    `void` | `setStartRow(java.lang.Integer startRow)` Starting row of requested results, used only with fetch operations.
    `void` | `setStreamResults(boolean streamResults)` If true, results will be streamed on the server, rather than all records being read into server memory at once; this approach is appropriate for retrieving or exporting large datasets without swamping the server.
    `void` | `setSummaryFunctions(java.util.Map<java.lang.String,SummaryFunctionType> summaryFunctions)` A mapping from field names to summary functions to be applied to each field.
    `void` | `setTextMatchStyle(TextMatchStyle textMatchStyle)` For "fetch" operations, how search criteria should be interpreted for text fields: one of "exact" for exact match, "exactCase" for case-sensitive exact match, "startsWith" for matching at the beginning only, or "substring" for substring match.
    `void` | `setUseFlatFields(java.lang.Boolean useFlatFields)` When `useFlatFields` is set for a request to be sent to a WSDL web service, when creating the input XML message to send to the web service, properties in `request.data` will be used as the values for XML elements of the same name, at any level of nesting.
    `void` | `setUseFlatHeaderFields(java.lang.Boolean useFlatHeaderFields)` Cause the `useFlatFields` XML serialization behavior to be used for all soap headers in the request.
    `void` | `setUseStrictJSON(java.lang.Boolean useStrictJSON)` Should the HTTP response to this request 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` | `setValidationMode(ValidationMode validationMode)` Mode of validation for entered data.

    - ### Methods inherited from class com.smartgwt.client.rpc.RPCRequest

      `getActionURL, getAllowIE9Leak, getBypassCache, getCallbackParam, getContainsCredentials, getContentType, getData, getDataAsString, getDownloadResult, getDownloadToNewWindow, getEvalResult, getHttpHeaders, getHttpMethod, getHttpProxyURL, getIgnoreTimeout, getOmitNullMapValuesInResponse, getParams, getPrompt, getPromptCursor, getPromptDelay, getPromptStyle, getSendNoQueue, getServerOutputAsString, getShowPrompt, getSuppressAutoDraw, getTimeout, getTransport, getUseHttpProxy, getUseSimpleHttp, getWillHandleError, getWithCredentials, setActionURL, setAllowIE9Leak, setBypassCache, setCallbackParam, setContainsCredentials, setContentType, setData, setData, setData, setData, setDownloadResult, setDownloadToNewWindow, setEvalResult, setEvalVars, setHttpHeaders, setHttpMethod, setHttpProxyURL, setIgnoreTimeout, setOmitNullMapValuesInResponse, setPrompt, setPromptCursor, setPromptDelay, setPromptStyle, setSendNoQueue, setServerOutputAsString, setShowPrompt, setSuppressAutoDraw, setTimeout, setTransport, setUseHttpProxy, setUseSimpleHttp, setWillHandleError, setWithCredentials`

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

      `applyFactoryProperties, doAddHandler, fireEvent, getAttribute, getAttributeAsBoolean, getAttributeAsBoolean, getAttributeAsDate, getAttributeAsDouble, getAttributeAsDoubleArray, getAttributeAsFloat, getAttributeAsInt, getAttributeAsIntArray, getAttributeAsJavaScriptObject, getAttributeAsLong, getAttributeAsMap, getAttributeAsObject, getAttributeAsRecord, getAttributeAsString, getAttributeAsStringArray, getAttributes, getHandlerCount, isFactoryCreated, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttributeAsJavaObject, setFactoryCreated`

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

      `equals, getJsObj, hashCode, isCreated, setJavaScriptObject, setJsObj`

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

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

- - ### Constructor Detail

    - #### DSRequest

          public DSRequest()

    - #### DSRequest

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

    - #### DSRequest

          public DSRequest(DSOperationType operationType)

    - #### DSRequest

          public DSRequest(DSOperationType operationType,
                           java.lang.String operationId)

    - #### DSRequest

          public DSRequest(DSOperationType operationType,
                           Record data)

    - #### DSRequest

          public DSRequest(DSOperationType operationType,
                           java.lang.String operationId,
                           Record data)

    - #### DSRequest

          public DSRequest(DSOperationType operationType,
                           com.google.gwt.core.client.JavaScriptObject data)

    - #### DSRequest

          public DSRequest(DSOperationType operationType,
                           java.lang.String operationId,
                           com.google.gwt.core.client.JavaScriptObject data)

    - #### DSRequest

          public DSRequest(DSOperationType operationType,
                           Criteria criteria)

    - #### DSRequest

          public DSRequest(DSOperationType operationType,
                           java.lang.String operationId,
                           Criteria criteria)

  - ### Method Detail

    - #### getOrCreateRef

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

    - #### setAdditionalOutputs

          public void setAdditionalOutputs(java.lang.String additionalOutputs)

      For fetch, add or update operation, an optional comma separated list of fields to fetch from another, related DataSource.

      Fields should be specified in the format `"localFieldName!relatedDataSourceID.relatedDataSourceFieldName"`. where `relatedDataSourceID` is the ID of the related dataSource, and `relatedDataSourceFieldName` is the field for which you want to fetch related values. The returned field values will be stored on the data returned to the client under the specified `localFieldName`. Note that this will be applied in addition to any specified `outputs`.

      Note that as with `DataSourceField.includeFrom`, the related dataSource must be linked to the primary datasource via a foreignKey relationship.

      Note additionalOutputs sent in request from the browser can be completely disabled in `server.properties` by setting `datasource.allowClientAdditionalOutputs`:

                datasource.allowClientAdditionalOutputs: false

      In this case `additionalOutputs` sent from the browser will be cleared before executing request. Note that programatically configured additionalOutputs are always allowed, but you can't modify them from within a DMI method, so the only way to execute a request with additionalOutputs that differ from what was sent by the client is to create a new DSRequest

      Note : This is an advanced setting

      Parameters:
        `additionalOutputs` - New additionalOutputs value. Default value is null

    - #### getAdditionalOutputs

          public java.lang.String getAdditionalOutputs()

      For fetch, add or update operation, an optional comma separated list of fields to fetch from another, related DataSource.

      Fields should be specified in the format `"localFieldName!relatedDataSourceID.relatedDataSourceFieldName"`. where `relatedDataSourceID` is the ID of the related dataSource, and `relatedDataSourceFieldName` is the field for which you want to fetch related values. The returned field values will be stored on the data returned to the client under the specified `localFieldName`. Note that this will be applied in addition to any specified `outputs`.

      Note that as with `DataSourceField.includeFrom`, the related dataSource must be linked to the primary datasource via a foreignKey relationship.

      Note additionalOutputs sent in request from the browser can be completely disabled in `server.properties` by setting `datasource.allowClientAdditionalOutputs`:

                datasource.allowClientAdditionalOutputs: false

      In this case `additionalOutputs` sent from the browser will be cleared before executing request. Note that programatically configured additionalOutputs are always allowed, but you can't modify them from within a DMI method, so the only way to execute a request with additionalOutputs that differ from what was sent by the client is to create a new DSRequest
      Returns:
        Current additionalOutputs value. Default value is null

    - #### setComponentId

          public void setComponentId(java.lang.String componentId)

      For requests submitted by a `DataBoundComponent`, the `Canvas.ID` of the submitting component.

      This ID will be present for operations including automatic saves by a ListGrid `during editing`, or calls to `form.saveData()`. It will not be present for a direct call to a DataSource method such as `DataSource.fetchData()`.

      Note this is the component's String ID - you can retrieve the component itself via `Canvas.getById()`.

      This property should be used for debugging purposes only - do not use it to trigger differences in server-side behavior, instead, use `operationId` because only `operationId` is considered when assessing `request equivalence`.

      Parameters:
        `componentId` - New componentId value. Default value is null

    - #### getComponentId

          public java.lang.String getComponentId()

      For requests submitted by a `DataBoundComponent`, the `Canvas.ID` of the submitting component.

      This ID will be present for operations including automatic saves by a ListGrid `during editing`, or calls to `form.saveData()`. It will not be present for a direct call to a DataSource method such as `DataSource.fetchData()`.

      Note this is the component's String ID - you can retrieve the component itself via `Canvas.getById()`.

      This property should be used for debugging purposes only - do not use it to trigger differences in server-side behavior, instead, use `operationId` because only `operationId` is considered when assessing `request equivalence`.

      Returns:
        Current componentId value. Default value is null

    - #### setDataProtocol

          public void setDataProtocol(DSProtocol dataProtocol)

      `DataProtocol` for this particular request.

      Note: Typically developers should use `operation bindings` to specify an explicit data protocol for a request.

      One exception: advanced developers may wish to have a custom `request transformer` with entirely client-side handling for some requests. This may be achieved by setting the request's `dataProtocol` to `"clientCustom"` within transformRequest, and also triggering application code which will fire `DataSource.processResponse()` when complete.

      The `DataSource.getDataProtocol()` method may be used to determine what data protocol will be used to handle a specific request based on this property (if set), otherwise the settings at the `operationBinding` or `dataSource` levels.

      Parameters:
        `dataProtocol` - New dataProtocol value. Default value is null

    - #### getDataProtocol

          public DSProtocol getDataProtocol()

      `DataProtocol` for this particular request.

      Note: Typically developers should use `operation bindings` to specify an explicit data protocol for a request.

      One exception: advanced developers may wish to have a custom `request transformer` with entirely client-side handling for some requests. This may be achieved by setting the request's `dataProtocol` to `"clientCustom"` within transformRequest, and also triggering application code which will fire `DataSource.processResponse()` when complete.

      The `DataSource.getDataProtocol()` method may be used to determine what data protocol will be used to handle a specific request based on this property (if set), otherwise the settings at the `operationBinding` or `dataSource` levels.

      Returns:
        Current dataProtocol value. Default value is null

    - #### setDataSource

          public void setDataSource(java.lang.String dataSource)

      DataSource this DSRequest will act on.

      This property is generally automatically populated, for example when calling `DataSource.fetchData()` the dataSource property is set to the target DataSource.

      Parameters:
        `dataSource` - New dataSource value. Default value is null

    - #### getDataSource

          public java.lang.String getDataSource()

      DataSource this DSRequest will act on.

      This property is generally automatically populated, for example when calling `DataSource.fetchData()` the dataSource property is set to the target DataSource.

      Returns:
        Current dataSource value. Default value is null

    - #### setEndRow

          public void setEndRow(java.lang.Integer endRow)

      End row of requested results, used only with fetch operations.

      Note that startRow and endRow are zero-based, inclusive at the beginning and exclusive at the end (like substring), so startRow: 0, endRow: 1 is a request for the first record.

      Parameters:
        `endRow` - New endRow value. Default value is null

    - #### getEndRow

          public java.lang.Integer getEndRow()

      End row of requested results, used only with fetch operations.

      Note that startRow and endRow are zero-based, inclusive at the beginning and exclusive at the end (like substring), so startRow: 0, endRow: 1 is a request for the first record.

      Returns:
        Current endRow value. Default value is null

    - #### setExportAs

          public void setExportAs(ExportFormat exportAs)

      The format in which the data should be exported. See `ExportFormat` for more information.
      Parameters:
        `exportAs` - New exportAs value. Default value is "csv"

    - #### getExportAs

          public ExportFormat getExportAs()

      The format in which the data should be exported. See `ExportFormat` for more information.
      Returns:
        Current exportAs value. Default value is "csv"

    - #### setExportCSS

          public void setExportCSS(java.lang.String exportCSS)

      When using `RPCManager.exportContent()` to produce a .pdf from a Smart GWT UI, this property allows dynamic CSS to be passed to the server. Since the `exportContent()` system already provides a way to specify a custom skin or additional stylesheet for export, `exportCSS` should only be used for small bits of CSS that are necessarily dynamic.

      For example, when printing a very wide page, such as a grid with many columns or a very wide chart, you could send the string "@page {size: A4 landscape; }" as `exportCSS` to cause the generated PDF to use landscape mode, so that all content fits without clipping.

      Parameters:
        `exportCSS` - New exportCSS value. Default value is null

    - #### getExportCSS

          public java.lang.String getExportCSS()

      When using `RPCManager.exportContent()` to produce a .pdf from a Smart GWT UI, this property allows dynamic CSS to be passed to the server. Since the `exportContent()` system already provides a way to specify a custom skin or additional stylesheet for export, `exportCSS` should only be used for small bits of CSS that are necessarily dynamic.

      For example, when printing a very wide page, such as a grid with many columns or a very wide chart, you could send the string "@page {size: A4 landscape; }" as `exportCSS` to cause the generated PDF to use landscape mode, so that all content fits without clipping.

      Returns:
        Current exportCSS value. Default value is null

    - #### setExportData

          public void setExportData(Record... exportData)

      Only applies to request properties passed to `ListGrid.exportClientData()`. If specified this property contains an arbitrary set of data to be exported.
      Parameters:
        `exportData` - New exportData value. Default value is null

    - #### getExportData

          public Record[] getExportData()

      Only applies to request properties passed to `ListGrid.exportClientData()`. If specified this property contains an arbitrary set of data to be exported.
      Returns:
        Current exportData value. Default value is null

    - #### setExportDatesAsFormattedString

          public void setExportDatesAsFormattedString(java.lang.Boolean exportDatesAsFormattedString)

      When exporting via `ListGrid.exportClientData()` to an `XLS` or `OOXML` spreadsheet, forces dates to export as a string rather than a true date value.

      If a date value is provided to a spreadsheet as a string, Excel or other spreadsheet applications may not recognize them as being date values that are valid for use in date-specific functions in formulas, filters, etc.

      For this reason, the default behavior of `exportClientData` is to provide date values to the spreadsheet as true date values. If `Format Strings` are provided via properties like `dataSourceField.format` these will be translated to Excel / OpenOffice format strings and used when generating spreadsheets. Other formatting logic, such as `cell formatters`, will not be used since they cannot be automatically translated to an Excel format string. If no translatable format string is available, date values will be provided to the spreadsheet with no formatter and the spreadsheet program's default formatting for date values will be used.

      If `exportDatesAsFormattedString` is set to true, date fields will appear as strings that exactly match the formatting shown in the `DataBoundComponent`. As noted above, this means the spreadsheet program will not recognize the value as a date.

      Parameters:
        `exportDatesAsFormattedString` - New exportDatesAsFormattedString value. Default value is null
      See Also:
        `ExportFormatting overview and related methods`

    - #### getExportDatesAsFormattedString

          public java.lang.Boolean getExportDatesAsFormattedString()

      When exporting via `ListGrid.exportClientData()` to an `XLS` or `OOXML` spreadsheet, forces dates to export as a string rather than a true date value.

      If a date value is provided to a spreadsheet as a string, Excel or other spreadsheet applications may not recognize them as being date values that are valid for use in date-specific functions in formulas, filters, etc.

      For this reason, the default behavior of `exportClientData` is to provide date values to the spreadsheet as true date values. If `Format Strings` are provided via properties like `dataSourceField.format` these will be translated to Excel / OpenOffice format strings and used when generating spreadsheets. Other formatting logic, such as `cell formatters`, will not be used since they cannot be automatically translated to an Excel format string. If no translatable format string is available, date values will be provided to the spreadsheet with no formatter and the spreadsheet program's default formatting for date values will be used.

      If `exportDatesAsFormattedString` is set to true, date fields will appear as strings that exactly match the formatting shown in the `DataBoundComponent`. As noted above, this means the spreadsheet program will not recognize the value as a date.

      Returns:
        Current exportDatesAsFormattedString value. Default value is null
      See Also:
        `ExportFormatting overview and related methods`

    - #### setExportDelimiter

          public void setExportDelimiter(java.lang.String exportDelimiter)

      The character to use as a field-separator in CSV exports. The default delimiter is comma.
      Parameters:
        `exportDelimiter` - New exportDelimiter value. Default value is ","

    - #### getExportDelimiter

          public java.lang.String getExportDelimiter()

      The character to use as a field-separator in CSV exports. The default delimiter is comma.
      Returns:
        Current exportDelimiter value. Default value is ","

    - #### setExportDisplay

          public void setExportDisplay(ExportDisplay exportDisplay)

      Specifies whether the exported data will be downloaded as an attachment or displayed in a new browser window. See `ExportDisplay` for more information.
      Parameters:
        `exportDisplay` - New exportDisplay value. Default value is "download"

    - #### getExportDisplay

          public ExportDisplay getExportDisplay()

      Specifies whether the exported data will be downloaded as an attachment or displayed in a new browser window. See `ExportDisplay` for more information.
      Returns:
        Current exportDisplay value. Default value is "download"

    - #### setExportFields

          public void setExportFields(java.lang.String... exportFields)

      The list of field names to export. If provided, the field list in the exported output is limited and sorted as per the list.

      If exportFields is not provided:

      - If we are exporting via `exportData()`, the field list in the exported output is every non-hidden field defined in the DataSource, in DataSource definition order
      - If we are exporting via `exportClientData()` and we are not exporting to OOXML, or we are exporting to OOXML but we are not `streaming`, the field list in the exported output is based on the client data sent up, taking every row into account (so if there is a value for field "foo" only in row 57, we will output a column "foo", the cells of which are empty except for row 57)
      - If we are exporting via `exportClientData()` and we are exporting to OOXML and streaming is in force (the default for OOXML), the field list in the exported output is based on the client data sent up, taking just the first row into account (so if there is a value for field "foo" only in row 57, we will not output a column "foo" at all)
      Parameters:
        `exportFields` - New exportFields value. Default value is null

    - #### getExportFields

          public java.lang.String[] getExportFields()

      The list of field names to export. If provided, the field list in the exported output is limited and sorted as per the list.

      If exportFields is not provided:

      - If we are exporting via `exportData()`, the field list in the exported output is every non-hidden field defined in the DataSource, in DataSource definition order
      - If we are exporting via `exportClientData()` and we are not exporting to OOXML, or we are exporting to OOXML but we are not `streaming`, the field list in the exported output is based on the client data sent up, taking every row into account (so if there is a value for field "foo" only in row 57, we will output a column "foo", the cells of which are empty except for row 57)
      - If we are exporting via `exportClientData()` and we are exporting to OOXML and streaming is in force (the default for OOXML), the field list in the exported output is based on the client data sent up, taking just the first row into account (so if there is a value for field "foo" only in row 57, we will not output a column "foo" at all)
      Returns:
        Current exportFields value. Default value is null

    - #### setExportFilename

          public void setExportFilename(java.lang.String exportFilename)

      The name of the file to save the exported data into. If `exportToFilesystem` is set, this is the name of the file the server creates on its filesystem. If `exportToClient` is set, this is the filename that will appear to the browser.

      If the exportFilename that you specify does not include an extension, one will be added to it based on the `ExportFormat` specified by `exportAs`. Filename is forced to have the correct extension to work around bugs in IE, but if you don't want the filename to be manipulated, use "custom" `exportFormat`, see example.

      Parameters:
        `exportFilename` - New exportFilename value. Default value is null
      See Also:
        `setExportPath(java.lang.String)`

    - #### getExportFilename

          public java.lang.String getExportFilename()

      The name of the file to save the exported data into. If `exportToFilesystem` is set, this is the name of the file the server creates on its filesystem. If `exportToClient` is set, this is the filename that will appear to the browser.

      If the exportFilename that you specify does not include an extension, one will be added to it based on the `ExportFormat` specified by `exportAs`. Filename is forced to have the correct extension to work around bugs in IE, but if you don't want the filename to be manipulated, use "custom" `exportFormat`, see example.

      Returns:
        Current exportFilename value. Default value is null
      See Also:
        `getExportPath()`

    - #### setExportFooter

          public void setExportFooter(java.lang.String exportFooter)

      Optional text to appear at the end of the file.
      Parameters:
        `exportFooter` - New exportFooter value. Default value is null

    - #### getExportFooter

          public java.lang.String getExportFooter()

      Optional text to appear at the end of the file.
      Returns:
        Current exportFooter value. Default value is null

    - #### setExportHeader

          public void setExportHeader(java.lang.String exportHeader)

      Optional text to appear at the beginning of the file.
      Parameters:
        `exportHeader` - New exportHeader value. Default value is null

    - #### getExportHeader

          public java.lang.String getExportHeader()

      Optional text to appear at the beginning of the file.
      Returns:
        Current exportHeader value. Default value is null

    - #### setExportHeaderless

          public void setExportHeaderless(java.lang.Boolean exportHeaderless)

      This property allows omitting column names from CSV and Excel exports (no effect on JSON or XML exports).
      Parameters:
        `exportHeaderless` - New exportHeaderless value. Default value is false

    - #### getExportHeaderless

          public java.lang.Boolean getExportHeaderless()

      This property allows omitting column names from CSV and Excel exports (no effect on JSON or XML exports).
      Returns:
        Current exportHeaderless value. Default value is false

    - #### setExportImageFormat

          public void setExportImageFormat(ExportImageFormat exportImageFormat)

      The image format in which the SVG graphic should be exported.
      Parameters:
        `exportImageFormat` - New exportImageFormat value. Default value is "png"

    - #### getExportImageFormat

          public ExportImageFormat getExportImageFormat()

      The image format in which the SVG graphic should be exported.
      Returns:
        Current exportImageFormat value. Default value is "png"

    - #### setExportImageQuality

          public void setExportImageQuality(java.lang.Float exportImageQuality)

      Deprecated. `GwtFloatVsDouble`
      If exporting in `JPEG format`, the output JPEG quality level. This is a number from 0 to 1, with 1 representing the best quality and 0 representing the least quality but smallest file size.
      Parameters:
        `exportImageQuality` - New exportImageQuality value. Default value is null

    - #### getExportImageQuality

          public java.lang.Float getExportImageQuality()

      Deprecated. `GwtFloatVsDouble`
      If exporting in `JPEG format`, the output JPEG quality level. This is a number from 0 to 1, with 1 representing the best quality and 0 representing the least quality but smallest file size.
      Returns:
        Current exportImageQuality value. Default value is null

    - #### setExportImageQuality

          public void setExportImageQuality(java.lang.Double exportImageQuality)

      If exporting in `JPEG format`, the output JPEG quality level. This is a number from 0 to 1, with 1 representing the best quality and 0 representing the least quality but smallest file size.
      Parameters:
        `exportImageQuality` - New exportImageQuality value. Default value is null

    - #### getExportImageQualityAsDouble

          public java.lang.Double getExportImageQualityAsDouble()

      If exporting in `JPEG format`, the output JPEG quality level. This is a number from 0 to 1, with 1 representing the best quality and 0 representing the least quality but smallest file size.
      Returns:
        Current exportImageQuality value. Default value is null

    - #### setExportPath

          public void setExportPath(java.lang.String exportPath)

      If `exportToFilesystem` is set, optionally specifies a path to use when saving the file. This path is relative to the default export path, which is set using the `server.properties` setting `export.location`; this is the project webRoot by default. For example, with the default setting of `export.location`, an `exportPath` of `"shared/ds"` and an `exportFilename` of `"exportedData.csv"`, Smart GWT Server would export to file `$webRoot/shared/ds/exportedData.csv`.

      If you do not specify this property, Smart GWT Server will export to the file indicated by `exportFilename` directly in the default export location.

      This property is only applicable when `exportToFilesystem` is set.

      Parameters:
        `exportPath` - New exportPath value. Default value is null
      See Also:
        `setExportFilename(java.lang.String)`

    - #### getExportPath

          public java.lang.String getExportPath()

      If `exportToFilesystem` is set, optionally specifies a path to use when saving the file. This path is relative to the default export path, which is set using the `server.properties` setting `export.location`; this is the project webRoot by default. For example, with the default setting of `export.location`, an `exportPath` of `"shared/ds"` and an `exportFilename` of `"exportedData.csv"`, Smart GWT Server would export to file `$webRoot/shared/ds/exportedData.csv`.

      If you do not specify this property, Smart GWT Server will export to the file indicated by `exportFilename` directly in the default export location.

      This property is only applicable when `exportToFilesystem` is set.

      Returns:
        Current exportPath value. Default value is null
      See Also:
        `getExportFilename()`

    - #### setExportPropertyIdentifier

          public void setExportPropertyIdentifier(PropertyIdentifier exportPropertyIdentifier)

      Determines the `PropertyIdentifier` to be used in the exported data. This essentially means, should we export internal field names like "countryCode" or "EMPLOYEE_NO", or localized descriptive field titles like "code du pays" or "Employee Number". This setting has a lot in common with `exportRawValues`; both are largely dependent on whether the exported data is intended for direct consumption by an end user (in which case it is appropriate to export formatted values and localized field titles), or for interface to some downstream computer system (in which case you probably want raw, unformatted values and internal field names).

      If this property is not set, the following defaults apply:

      - If the export format is a native spreadsheet format (XLS or OOXML), localized field titles are used
      - If the export format is CSV, XML or JSON and this is a client-driven export (ie it was initiated by a call to `exportClientData()`), localized field titles are used
      - If the export format is CSV, XML or JSON and this is not a client-driven export, internal field names are used
      Parameters:
        `exportPropertyIdentifier` - New exportPropertyIdentifier value. Default value is null
      See Also:
        `ExportFormatting overview and related methods`

    - #### getExportPropertyIdentifier

          public PropertyIdentifier getExportPropertyIdentifier()

      Determines the `PropertyIdentifier` to be used in the exported data. This essentially means, should we export internal field names like "countryCode" or "EMPLOYEE_NO", or localized descriptive field titles like "code du pays" or "Employee Number". This setting has a lot in common with `exportRawValues`; both are largely dependent on whether the exported data is intended for direct consumption by an end user (in which case it is appropriate to export formatted values and localized field titles), or for interface to some downstream computer system (in which case you probably want raw, unformatted values and internal field names).

      If this property is not set, the following defaults apply:

      - If the export format is a native spreadsheet format (XLS or OOXML), localized field titles are used
      - If the export format is CSV, XML or JSON and this is a client-driven export (ie it was initiated by a call to `exportClientData()`), localized field titles are used
      - If the export format is CSV, XML or JSON and this is not a client-driven export, internal field names are used
      Returns:
        Current exportPropertyIdentifier value. Default value is null
      See Also:
        `ExportFormatting overview and related methods`

    - #### setExportRawValues

          public void setExportRawValues(java.lang.Boolean exportRawValues)

      Whether formatting settings should be applied to data being exported. Default behavior and the effect of setting of `exportRawValues` is described in the `Export Formatting overview`.
      Parameters:
        `exportRawValues` - New exportRawValues value. Default value is null
      See Also:
        `ExportFormatting overview and related methods`

    - #### getExportRawValues

          public java.lang.Boolean getExportRawValues()

      Whether formatting settings should be applied to data being exported. Default behavior and the effect of setting of `exportRawValues` is described in the `Export Formatting overview`.
      Returns:
        Current exportRawValues value. Default value is null
      See Also:
        `ExportFormatting overview and related methods`

    - #### setExportResults

          public void setExportResults(java.lang.Boolean exportResults)

      When set, causes the results of the DSRequest to be exported to a file, whose name and format are indicated by `exportFilename` and `exportAs` respectively. When no exportFilename is provided, the default is Results.csv and the default value of exportAs is csv.

      The export field-list can also be configured, see `exportFields`. Formats for exported date and numeric are controlled by several settings - see `ExportFormatting` for an overview.

      Once the operation completes, `exportDisplay` specifies whether the exported data should be downloaded to the file-system or displayed in a new window. The default value of exportDisplay is "download" which displays the Save As dialog. See `ExportDisplay` for more information.

      You can configure the style of `line-breaks` to use when generating the output, the `delimiter` to use when exporting to CSV and the `separator-character` to use in field-titles when exporting to XML.

      Additionally, you can output arbitrary text before and after the exported data by setting `exportHeader` and `exportFooter`.

      Note that for security reasons, an export initiated using dsRequest properties does not provide support for JSON format (see this post for more detail). However, you can use operationBinding.exportAs:"json" in a server-side .ds.xml file to force JSON export to be allowed.

      As well as setting dsRequest.exportResults and related properties, exports can be initiated in two other ways, via `OperationBinding`s and via custom server code which sets export-related properties on the `DSResponse`. Both of those methods support exporting to JSON format.

      Format Examples XML format

                <List>
                    <Object>
                        <id>10101</id>
                        <displayName>Record 10101</displayName>
                    </Object>
               </List>

      JSON Format

                [
                    { id: 10101, displayName: "Record 10101" }
                ]

      CSV Format

                id,displayName
                10101,"Record 10101"

      Parameters:
        `exportResults` - New exportResults value. Default value is false

    - #### getExportResults

          public java.lang.Boolean getExportResults()

      When set, causes the results of the DSRequest to be exported to a file, whose name and format are indicated by `exportFilename` and `exportAs` respectively. When no exportFilename is provided, the default is Results.csv and the default value of exportAs is csv.

      The export field-list can also be configured, see `exportFields`. Formats for exported date and numeric are controlled by several settings - see `ExportFormatting` for an overview.

      Once the operation completes, `exportDisplay` specifies whether the exported data should be downloaded to the file-system or displayed in a new window. The default value of exportDisplay is "download" which displays the Save As dialog. See `ExportDisplay` for more information.

      You can configure the style of `line-breaks` to use when generating the output, the `delimiter` to use when exporting to CSV and the `separator-character` to use in field-titles when exporting to XML.

      Additionally, you can output arbitrary text before and after the exported data by setting `exportHeader` and `exportFooter`.

      Note that for security reasons, an export initiated using dsRequest properties does not provide support for JSON format (see this post for more detail). However, you can use operationBinding.exportAs:"json" in a server-side .ds.xml file to force JSON export to be allowed.

      As well as setting dsRequest.exportResults and related properties, exports can be initiated in two other ways, via `OperationBinding`s and via custom server code which sets export-related properties on the `DSResponse`. Both of those methods support exporting to JSON format.

      Format Examples XML format

                <List>
                    <Object>
                        <id>10101</id>
                        <displayName>Record 10101</displayName>
                    </Object>
               </List>

      JSON Format

                [
                    { id: 10101, displayName: "Record 10101" }
                ]

      CSV Format

                id,displayName
                10101,"Record 10101"

      Returns:
        Current exportResults value. Default value is false

    - #### setExportShowHeaderSpanTitles

          public void setExportShowHeaderSpanTitles(java.lang.Boolean exportShowHeaderSpanTitles)

      When you erxport a `ListGrid` that has `headerSpans`, should headerSpans also be exported. See `exportSpanTitleSeparator` for details of of what it means to export headerSpans to different export targets.

      Note that `exportPropertyIdentifier` controls whether field names or titles are appended to the headerSpan titles (and used for fields without headerSpans).

      Parameters:
        `exportShowHeaderSpanTitles` - New exportShowHeaderSpanTitles value. Default value is true

    - #### getExportShowHeaderSpanTitles

          public java.lang.Boolean getExportShowHeaderSpanTitles()

      When you erxport a `ListGrid` that has `headerSpans`, should headerSpans also be exported. See `exportSpanTitleSeparator` for details of of what it means to export headerSpans to different export targets.

      Note that `exportPropertyIdentifier` controls whether field names or titles are appended to the headerSpan titles (and used for fields without headerSpans).

      Returns:
        Current exportShowHeaderSpanTitles value. Default value is true

    - #### setExportSpanTitleSeparator

          public void setExportSpanTitleSeparator(java.lang.String exportSpanTitleSeparator)

      When you export a `ListGrid` that has `headerSpans` defined and `exportShowHeaderSpanTitles` is true, the behavior is dependent on the export type. Direct exports to Excel formats (both XLS and OOXML) place the headerSpans in merged cells in the spreadsheet, giving the same visual effect as the original ListGrid. This is not possible with exports to CSV format; instead, we alter the exported headers so that they contain the titles of the ancestor headerSpan(s).

      For example, if you had a field titled "Population" inside a headerSpan titled "National", nested inside another headerSpan titled "Demographics", that would result in the exported field being titled "Demographics - National - Population".

      The `exportSpanTitleSeparator` property allows you to override the separator string used when constructing these amalgamated headers.

      Parameters:
        `exportSpanTitleSeparator` - New exportSpanTitleSeparator value. Default value is " - "

    - #### getExportSpanTitleSeparator

          public java.lang.String getExportSpanTitleSeparator()

      When you export a `ListGrid` that has `headerSpans` defined and `exportShowHeaderSpanTitles` is true, the behavior is dependent on the export type. Direct exports to Excel formats (both XLS and OOXML) place the headerSpans in merged cells in the spreadsheet, giving the same visual effect as the original ListGrid. This is not possible with exports to CSV format; instead, we alter the exported headers so that they contain the titles of the ancestor headerSpan(s).

      For example, if you had a field titled "Population" inside a headerSpan titled "National", nested inside another headerSpan titled "Demographics", that would result in the exported field being titled "Demographics - National - Population".

      The `exportSpanTitleSeparator` property allows you to override the separator string used when constructing these amalgamated headers.

      Returns:
        Current exportSpanTitleSeparator value. Default value is " - "

    - #### setExportStreaming

          public void setExportStreaming(boolean exportStreaming)

      When exporting to OOXML format (this is the standard file format used by Excel 2007 and later), we default to using streaming mode, for memory efficiency. You can override this for individual exports by setting this flag false. You may wish to do this if you need to grab the spreadsheet object in a DMI and do something with it. The underlying object in use - POI's `SXSSFWorkbook` - is intended for write only and cannot usefully be read.

      You can switch off Excel streaming altogether by setting "excel.useStreaming" false in `server.properties`.

      Note, OOXML is the only native Excel format that supports streaming: when exporting to the older XLS format, we build the spreadsheet in its entirety in server-side memory before writing it to disk or returning it to the client. This is unlikely to change: streaming the XLS format is impractical bcause it is a self-referential binary format, and in any case the problem of huge exports overflowing JVM memory is less likely to arise with XLS, because it is innately limited to 65535 rows.

      Parameters:
        `exportStreaming` - New exportStreaming value. Default value is true

    - #### getExportStreaming

          public boolean getExportStreaming()

      When exporting to OOXML format (this is the standard file format used by Excel 2007 and later), we default to using streaming mode, for memory efficiency. You can override this for individual exports by setting this flag false. You may wish to do this if you need to grab the spreadsheet object in a DMI and do something with it. The underlying object in use - POI's `SXSSFWorkbook` - is intended for write only and cannot usefully be read.

      You can switch off Excel streaming altogether by setting "excel.useStreaming" false in `server.properties`.

      Note, OOXML is the only native Excel format that supports streaming: when exporting to the older XLS format, we build the spreadsheet in its entirety in server-side memory before writing it to disk or returning it to the client. This is unlikely to change: streaming the XLS format is impractical bcause it is a self-referential binary format, and in any case the problem of huge exports overflowing JVM memory is less likely to arise with XLS, because it is innately limited to 65535 rows.

      Returns:
        Current exportStreaming value. Default value is true

    - #### setExportTitleSeparatorChar

          public void setExportTitleSeparatorChar(java.lang.String exportTitleSeparatorChar)

      The character with which to replace spaces in field-titles when exporting to XML. If not specified in the request, the server uses "".
      Parameters:
        `exportTitleSeparatorChar` - New exportTitleSeparatorChar value. Default value is null

    - #### getExportTitleSeparatorChar

          public java.lang.String getExportTitleSeparatorChar()

      The character with which to replace spaces in field-titles when exporting to XML. If not specified in the request, the server uses "".
      Returns:
        Current exportTitleSeparatorChar value. Default value is null

    - #### setExportToClient

          public void setExportToClient(java.lang.Boolean exportToClient)

      If set, Smart GWT Server will export data back to the client, either as a file download or as content in a new browser window, depending on the setting of `exportDisplay`.

      Note that it is perfectly valid to specify both this property and `exportToFilesystem`; in this case the data is both exported to a file on the server filesystem, and downloaded to the client. If you specify neither property, the export no-ops.

      Parameters:
        `exportToClient` - New exportToClient value. Default value is true

    - #### getExportToClient

          public java.lang.Boolean getExportToClient()

      If set, Smart GWT Server will export data back to the client, either as a file download or as content in a new browser window, depending on the setting of `exportDisplay`.

      Note that it is perfectly valid to specify both this property and `exportToFilesystem`; in this case the data is both exported to a file on the server filesystem, and downloaded to the client. If you specify neither property, the export no-ops.

      Returns:
        Current exportToClient value. Default value is true

    - #### setExportToFilesystem

          public void setExportToFilesystem(java.lang.Boolean exportToFilesystem)

      If set, Smart GWT Server will export data to a file on the server filesystem. The file we export to is determined by the `exportFilename` and `exportPath`. Note that filesystem exports are disabled by default, for security reasons. To enable them, set `export.allow.filesystem` to true in your `server.properties` file. If you enable filesystem exports, you should also consider setting a default export path, as described in the `exportPath` documentation.

      Note that it is perfectly valid to specify both this property and `exportToClient`; in this case the data is both exported to a file on the server filesystem and downloaded to the client. If you specify neither property, the export no-ops.

      It is possible to redirect the filesystem export to make use of an `OutputStream` you provide. You use this when you want to make some use of the export document other than writing it to a disk file - for example, attaching it to an email or writing it to a database table. See the server-side Javadocs for `DSRequest.setExportTo()`.

      Parameters:
        `exportToFilesystem` - New exportToFilesystem value. Default value is false

    - #### getExportToFilesystem

          public java.lang.Boolean getExportToFilesystem()

      If set, Smart GWT Server will export data to a file on the server filesystem. The file we export to is determined by the `exportFilename` and `exportPath`. Note that filesystem exports are disabled by default, for security reasons. To enable them, set `export.allow.filesystem` to true in your `server.properties` file. If you enable filesystem exports, you should also consider setting a default export path, as described in the `exportPath` documentation.

      Note that it is perfectly valid to specify both this property and `exportToClient`; in this case the data is both exported to a file on the server filesystem and downloaded to the client. If you specify neither property, the export no-ops.

      It is possible to redirect the filesystem export to make use of an `OutputStream` you provide. You use this when you want to make some use of the export document other than writing it to a disk file - for example, attaching it to an email or writing it to a database table. See the server-side Javadocs for `DSRequest.setExportTo()`.

      Returns:
        Current exportToFilesystem value. Default value is false

    - #### setExportTZ

          public void setExportTZ(java.lang.String exportTZ)

      For server-side export with `ExportFormat` "xls" or "ooxml" only, timezone to use when saving values from `FieldType` "datetime" to the spreadsheet.

      This setting exists because MS Excel™ has no concept of providing a true datetime value that is timezone-independent and will display in the local timezone where the Excel program is launched. Instead, datetime values must be provided as a rendered string, which implies rendering in a particular timezone when the spreadsheet is generated.

      `exportTZ` can either be specified as a timezone offset in the same format expected by String (for example, "+01:00" for one hour after GMT) or as the special constants "client" (meaning the current client display timezone) or "server" (meaning the timezone of the server).

      Default if unspecified is "server".

      This setting does not affect fields of type "date" or "time", which are timezone-independent values. See `DateFormatAndStorage` for more information on how Smart GWT handles date, time and datetime values.

      All non-spreadsheet export formats always use UTC. This setting also does not affect client-driven exports (`DataSource.exportClientData()`), which always use client-side time.

      Parameters:
        `exportTZ` - New exportTZ value. Default value is null
      See Also:
        `ExportFormatting overview and related methods`

    - #### getExportTZ

          public java.lang.String getExportTZ()

      For server-side export with `ExportFormat` "xls" or "ooxml" only, timezone to use when saving values from `FieldType` "datetime" to the spreadsheet.

      This setting exists because MS Excel™ has no concept of providing a true datetime value that is timezone-independent and will display in the local timezone where the Excel program is launched. Instead, datetime values must be provided as a rendered string, which implies rendering in a particular timezone when the spreadsheet is generated.

      `exportTZ` can either be specified as a timezone offset in the same format expected by String (for example, "+01:00" for one hour after GMT) or as the special constants "client" (meaning the current client display timezone) or "server" (meaning the timezone of the server).

      Default if unspecified is "server".

      This setting does not affect fields of type "date" or "time", which are timezone-independent values. See `DateFormatAndStorage` for more information on how Smart GWT handles date, time and datetime values.

      All non-spreadsheet export formats always use UTC. This setting also does not affect client-driven exports (`DataSource.exportClientData()`), which always use client-side time.

      Returns:
        Current exportTZ value. Default value is null
      See Also:
        `ExportFormatting overview and related methods`

    - #### setExportValueFields

          public void setExportValueFields(java.lang.Boolean exportValueFields)

      This flag has a different meaning depending on whether you are doing a client-driven or server-driven export.

      For `exportClientData()` calls (client-driven), ordinarily any fields that have a `displayField` defined have the value of that displayField exported, rather than the underlying value in the `valueField`. If you set the `exportValueFields` property, we export both the underlying value and the displayField value.

      Again for `exportClientData()` calls, any fields that have a `valueMap` defined ordinarily have the mapped value of the field exported, rather than the underlying data value. If you set the `exportValueFields` property, we instead export the underlying data value. Note, there is only one field in this scenario, not a `valueField` and a separate `displayField`, so we export either the underlying data value or the mapped value, not both as in the `displayField`/`valueField` case described above.

      For `exportData()` calls (server-driven), we ordinarily export the underlying data value of all fields. However, if you set the `exportValueFields` property explicitly to `false`, any fields that have a DataSource-defined `valueMap` will have the mapped value exported instead. This is similar to the client-side treatment of valueMaps, except that the defaults are reversed.

      Parameters:
        `exportValueFields` - New exportValueFields value. Default value is null

    - #### getExportValueFields

          public java.lang.Boolean getExportValueFields()

      This flag has a different meaning depending on whether you are doing a client-driven or server-driven export.

      For `exportClientData()` calls (client-driven), ordinarily any fields that have a `displayField` defined have the value of that displayField exported, rather than the underlying value in the `valueField`. If you set the `exportValueFields` property, we export both the underlying value and the displayField value.

      Again for `exportClientData()` calls, any fields that have a `valueMap` defined ordinarily have the mapped value of the field exported, rather than the underlying data value. If you set the `exportValueFields` property, we instead export the underlying data value. Note, there is only one field in this scenario, not a `valueField` and a separate `displayField`, so we export either the underlying data value or the mapped value, not both as in the `displayField`/`valueField` case described above.

      For `exportData()` calls (server-driven), we ordinarily export the underlying data value of all fields. However, if you set the `exportValueFields` property explicitly to `false`, any fields that have a DataSource-defined `valueMap` will have the mapped value exported instead. This is similar to the client-side treatment of valueMaps, except that the defaults are reversed.

      Returns:
        Current exportValueFields value. Default value is null

    - #### setFieldValueExpressions

          public void setFieldValueExpressions(java.util.Map fieldValueExpressions)

      A set of key:value pairs, mapping field names to expressions that will be evaluated server-side to derive a value for that field. This property allows for client-driven `Transaction Chaining`, with some restrictions for security reasons:
      - Normal `server-side Transaction Chaining settings` for a field take precedence over this property, so server-defined rules cannot be overridden from the client
      - Arbitrary Velocity expressions are not allowed in DSRequests sent from the client (`fieldValueExpressions` is also a valid property on a server-side DSRequest, and normal Velocity expressions are allowed in that case - see the server-side Javadoc for `DSRequest.setFieldValueExpressions()`). For client-originated requests, only the following bindings are allowed - see the `Velocity overview` for details of what these values mean:
        - $currentDate
        - $transactionDate
        - $userId
        - $masterId - see `DSRequestModifier.value` for details
        - References to specific fields in prior responses, via $responseData.first and $responseData.last, with or without parameters. For example, $responseData.first("myDataSource", "fetch")[0].myField. See the `Velocity overview` for details of $responseData
        - References to certain metadata properties of prior responses, via $responses.first and $responses.last, with or without parameters. For example, $responses.last("myDataSource", "fetch").totalRows. Note that the only properties allowed in a client-driven `fieldValueExpression` are: "startRow", "endRow", "totalRows" and "status"; this restriction does not apply to server-driven `fieldValueExpressions`. See the Velocity overview for details of $responses
      - Normal `declarative security rules` apply: if a field is not valid for writing, its `fieldValueExpression` will be ignored. Again, this only applies to client-originated requests.
      Note, it is possible to globally disable `fieldValueExpression` in client-originated requests by setting a flag in your `server.properties` file:

             dataSource.allowClientFieldValueExpressions: false

      Parameters:
        `fieldValueExpressions` - New fieldValueExpressions value. Default value is null
      See Also:
        `TransactionChaining overview and related methods`

    - #### getFieldValueExpressions

          public java.util.Map getFieldValueExpressions()

      A set of key:value pairs, mapping field names to expressions that will be evaluated server-side to derive a value for that field. This property allows for client-driven `Transaction Chaining`, with some restrictions for security reasons:
      - Normal `server-side Transaction Chaining settings` for a field take precedence over this property, so server-defined rules cannot be overridden from the client
      - Arbitrary Velocity expressions are not allowed in DSRequests sent from the client (`fieldValueExpressions` is also a valid property on a server-side DSRequest, and normal Velocity expressions are allowed in that case - see the server-side Javadoc for `DSRequest.setFieldValueExpressions()`). For client-originated requests, only the following bindings are allowed - see the `Velocity overview` for details of what these values mean:
        - $currentDate
        - $transactionDate
        - $userId
        - $masterId - see `DSRequestModifier.value` for details
        - References to specific fields in prior responses, via $responseData.first and $responseData.last, with or without parameters. For example, $responseData.first("myDataSource", "fetch")[0].myField. See the `Velocity overview` for details of $responseData
        - References to certain metadata properties of prior responses, via $responses.first and $responses.last, with or without parameters. For example, $responses.last("myDataSource", "fetch").totalRows. Note that the only properties allowed in a client-driven `fieldValueExpression` are: "startRow", "endRow", "totalRows" and "status"; this restriction does not apply to server-driven `fieldValueExpressions`. See the Velocity overview for details of $responses
      - Normal `declarative security rules` apply: if a field is not valid for writing, its `fieldValueExpression` will be ignored. Again, this only applies to client-originated requests.
      Note, it is possible to globally disable `fieldValueExpression` in client-originated requests by setting a flag in your `server.properties` file:

             dataSource.allowClientFieldValueExpressions: false

      Returns:
        Current fieldValueExpressions value. Default value is null
      See Also:
        `TransactionChaining overview and related methods`

    - #### setGenerateRelatedUpdates

          public void setGenerateRelatedUpdates(java.lang.Boolean generateRelatedUpdates)

      Specifies should related updates have to be generated. If not set (or set to `null`) then related updates will be generated only for "add" and "update" operations. This property has to be explicitly set to `true` to generate related updates for "remove" operation.

      This functionality loads related objects from database thus affecting operation performance. For "add" and "update" operations related objects are loaded anyway and performance impact is minimal. Simple "remove" operation does not need to load related objects. Depending on database structure performance impact can be significant if this property is set to `true`.

      Note this feature works only with Hibernate/JPA data sources, see `JPA & Hibernate Relations` for instructions how to set up relations. Table below uses "country -> cities" sample data model.

      Relation and Operation type | Loading complete related objects | Loading related IDs
      Many-to-one (cities -> country): ADD/UPDATE | If operation affected country, for example new city added with existing countryId, then relatedUpdate is generated. Otherwise if city is added or updated without countryId set, relatedUpdate is not generated. Note that if provided countryId does not exist, it is created. | Same as with complete related objects, except if provided countryId does not exist, then it is not created, but reset to NULL.
      Many-to-one (cities -> country): REMOVE | Removes record, depending on setting generates or not relatedUpdate for parent record. For example if city record is removed and countryId is sent to the server in remove request, then country record will be generated in relatedUpdates.
      One-to-many (country -> cities): ADD/UPDATE | If add or update operation provides value sets for cities as well as for country, then cities are created/updated if necessary and relatedUpdates are generated. Note that all fields in cities value sets can be sent to server. | Same as with complete related objects, except you can only sent primary key values for cities.
      One-to-many (country -> cities): REMOVE | Removes country, depending on setting returns or not relatedUpdates for the cities of removed country, which can be either REMOVE operations of all cities if cascade enabled, or UPDATE operations setting countryId=null to all cities if cascade is disabled

      Note that Many-to-Many works the same way as One-to-Many.

      Parameters:
        `generateRelatedUpdates` - New generateRelatedUpdates value. Default value is null

    - #### getGenerateRelatedUpdates

          public java.lang.Boolean getGenerateRelatedUpdates()

      Specifies should related updates have to be generated. If not set (or set to `null`) then related updates will be generated only for "add" and "update" operations. This property has to be explicitly set to `true` to generate related updates for "remove" operation.

      This functionality loads related objects from database thus affecting operation performance. For "add" and "update" operations related objects are loaded anyway and performance impact is minimal. Simple "remove" operation does not need to load related objects. Depending on database structure performance impact can be significant if this property is set to `true`.

      Note this feature works only with Hibernate/JPA data sources, see `JPA & Hibernate Relations` for instructions how to set up relations. Table below uses "country -> cities" sample data model.

      Relation and Operation type | Loading complete related objects | Loading related IDs
      Many-to-one (cities -> country): ADD/UPDATE | If operation affected country, for example new city added with existing countryId, then relatedUpdate is generated. Otherwise if city is added or updated without countryId set, relatedUpdate is not generated. Note that if provided countryId does not exist, it is created. | Same as with complete related objects, except if provided countryId does not exist, then it is not created, but reset to NULL.
      Many-to-one (cities -> country): REMOVE | Removes record, depending on setting generates or not relatedUpdate for parent record. For example if city record is removed and countryId is sent to the server in remove request, then country record will be generated in relatedUpdates.
      One-to-many (country -> cities): ADD/UPDATE | If add or update operation provides value sets for cities as well as for country, then cities are created/updated if necessary and relatedUpdates are generated. Note that all fields in cities value sets can be sent to server. | Same as with complete related objects, except you can only sent primary key values for cities.
      One-to-many (country -> cities): REMOVE | Removes country, depending on setting returns or not relatedUpdates for the cities of removed country, which can be either REMOVE operations of all cities if cascade enabled, or UPDATE operations setting countryId=null to all cities if cascade is disabled

      Note that Many-to-Many works the same way as One-to-Many.

      Returns:
        Current generateRelatedUpdates value. Default value is null

    - #### setGroupBy

          public void setGroupBy(java.lang.String... groupBy)

      List of fields to group by when using `server-side summarization`.

      Valid only for an operation of type "fetch". See the `Server Summaries overview` for details and examples of usage.

      Parameters:
        `groupBy` - New groupBy value. Default value is null
      See Also:
        `setSummaryFunctions(java.util.Map<java.lang.String, com.smartgwt.client.types.SummaryFunctionType>)`, `ServerSummaries overview and related methods`

    - #### getGroupBy

          public java.lang.String[] getGroupBy()

      List of fields to group by when using `server-side summarization`.

      Valid only for an operation of type "fetch". See the `Server Summaries overview` for details and examples of usage.

      Returns:
        Current groupBy value. Default value is null
      See Also:
        `getSummaryFunctions()`, `ServerSummaries overview and related methods`

    - #### setHeaderData

          public void setHeaderData(java.util.Map headerData)

      For DataSources using SOAP messaging with a WSDL web service, data to be serialized to form SOAP headers, as a map from the header part name to the data. See `WSRequest.headerData` for more information.

      SOAP headers typically contain request metadata such as a session id for authentication, and so `dsRequest.headerData` is typically populated by `DataSource.transformRequest()`, or, for data that applies to every request sent to the server, by `WebService.getHeaderData()`.

      Note that this only applies to SOAP headers. General HTTP headers for requests may be modified using `RPCRequest.httpHeaders`.

      Parameters:
        `headerData` - New headerData value. Default value is null

    - #### getHeaderData

          public java.util.Map getHeaderData()

      For DataSources using SOAP messaging with a WSDL web service, data to be serialized to form SOAP headers, as a map from the header part name to the data. See `WSRequest.headerData` for more information.

      SOAP headers typically contain request metadata such as a session id for authentication, and so `dsRequest.headerData` is typically populated by `DataSource.transformRequest()`, or, for data that applies to every request sent to the server, by `WebService.getHeaderData()`.

      Note that this only applies to SOAP headers. General HTTP headers for requests may be modified using `RPCRequest.httpHeaders`.

      Returns:
        Current headerData value. Default value is null

    - #### setKeepParentsOnFilter

          public void setKeepParentsOnFilter(java.lang.Boolean keepParentsOnFilter)

      This property is for advanced use in integrating trees that `load data on demand` using data paging. When this flag is set, a server fetch operation is expected to return all of the tree nodes that either match the provided criteria or have one or more children that match the criteria.

      A ResultTree with `fetchMode:"paged"` and with `keepParentsOnFilter` enabled will automatically set this property to `true` on all DSRequests that it sends to the server.

      Currently, no built-in server-side connectors (SQL, JPA, Hibernate) implement support for the keepParentsOnFilter flag.

      Parameters:
        `keepParentsOnFilter` - New keepParentsOnFilter value. Default value is null
      See Also:
        `TreeDataBinding overview and related methods`

    - #### getKeepParentsOnFilter

          public java.lang.Boolean getKeepParentsOnFilter()

      This property is for advanced use in integrating trees that `load data on demand` using data paging. When this flag is set, a server fetch operation is expected to return all of the tree nodes that either match the provided criteria or have one or more children that match the criteria.

      A ResultTree with `fetchMode:"paged"` and with `keepParentsOnFilter` enabled will automatically set this property to `true` on all DSRequests that it sends to the server.

      Currently, no built-in server-side connectors (SQL, JPA, Hibernate) implement support for the keepParentsOnFilter flag.

      Returns:
        Current keepParentsOnFilter value. Default value is null
      See Also:
        `TreeDataBinding overview and related methods`

    - #### setLineBreakStyle

          public void setLineBreakStyle(java.lang.String lineBreakStyle)

      The style of line-breaks to use in the exported output. See `LineBreakStyle` for more information.
      Parameters:
        `lineBreakStyle` - New lineBreakStyle value. Default value is null

    - #### getLineBreakStyle

          public java.lang.String getLineBreakStyle()

      The style of line-breaks to use in the exported output. See `LineBreakStyle` for more information.
      Returns:
        Current lineBreakStyle value. Default value is null

    - #### setOldValues

          public void setOldValues(Record oldValues)

      For an `update` or `remove` operation, the original values from the record that is being updated or removed. `oldValues` is automatically added to DSRequests submitted by DataBound Components. Available on the server via `DSRequest.getOldValues()`.

      The server can compare the `oldValues` to the most recent stored values in order to detect that the user was looking at stale values when the user submitted changes (NOTE: this means of detecting concurrent edit is sometimes called "optimistic concurrency" or "long transactions").

      In applications where a policy of "last update wins" is not appropriate when updating certain fields, special UI can be shown for this case. For example, on detecting concurrent edit, the server may send back a special `dsResponse.status` code that the client application detects, offering the user a choice of proceeding with the operation, discarding edits, or reconciling new and old values in a special interface.

      Parameters:
        `oldValues` - New oldValues value. Default value is null

    - #### getOldValues

          public Record getOldValues()

      For an `update` or `remove` operation, the original values from the record that is being updated or removed. `oldValues` is automatically added to DSRequests submitted by DataBound Components. Available on the server via `DSRequest.getOldValues()`.

      The server can compare the `oldValues` to the most recent stored values in order to detect that the user was looking at stale values when the user submitted changes (NOTE: this means of detecting concurrent edit is sometimes called "optimistic concurrency" or "long transactions").

      In applications where a policy of "last update wins" is not appropriate when updating certain fields, special UI can be shown for this case. For example, on detecting concurrent edit, the server may send back a special `dsResponse.status` code that the client application detects, offering the user a choice of proceeding with the operation, discarding edits, or reconciling new and old values in a special interface.

      Returns:
        Current oldValues value. Default value is null

    - #### setOperationId

          public void setOperationId(java.lang.String operationId)

      When a `DataBoundComponent` sends a DSRequest, the `dsRequest.operationId` will be automatically picked up from the `fetchOperation`, `addOperation`, etc properties of the DataBoundComponent.

      The `operationId` serves as an identifier that you can use to create variations on the 4 basic DataSource operations that are used by different components in different parts of your application. For example, you may be using a standard `fetch` operation in one part of your application, however on another screen you want to perform a `fetch` operation on the same DataSource but interpret search criteria differently (eg full text search).

      If you declare more than one `OperationBinding` for the same `OperationBinding.operationType`, you can specify an `operationId` `on the operationBinding` which will cause that operationBinding to be used for dsRequests containing a matching `operationId`. This allows all the possible settings of an `operationBinding`, including `wsOperation` or `DMI` settings, to be switched on a per-component or per-request basis.

      For example, by setting the `fetchOperation` on a particular ListGrid, you could cause it to invoke a different server method via DMI, different `dataURL` or different `web service operation`.

      The `operationId` can also be directly received by the server in order to affect behavior. When using the Smart GWT Server, `operationId` can be accessed via dsRequest.getOperationId(). The `RestDataSource` will also send the `operationId` to the server as part of the `request metadata`.

      Note that if you `manually invoke` a DataSource operation, you can also specify operationId via the `requestProperties` parameter.

      Note that the `operationId` has special significance in terms of whether two DSRequests are considered equivalent for caching and synchronization purposes - see `DsRequestEquivalence`.

      Parameters:
        `operationId` - New operationId value. Default value is null
      See Also:
        `Operations overview and related methods`

    - #### getOperationId

          public java.lang.String getOperationId()

      When a `DataBoundComponent` sends a DSRequest, the `dsRequest.operationId` will be automatically picked up from the `fetchOperation`, `addOperation`, etc properties of the DataBoundComponent.

      The `operationId` serves as an identifier that you can use to create variations on the 4 basic DataSource operations that are used by different components in different parts of your application. For example, you may be using a standard `fetch` operation in one part of your application, however on another screen you want to perform a `fetch` operation on the same DataSource but interpret search criteria differently (eg full text search).

      If you declare more than one `OperationBinding` for the same `OperationBinding.operationType`, you can specify an `operationId` `on the operationBinding` which will cause that operationBinding to be used for dsRequests containing a matching `operationId`. This allows all the possible settings of an `operationBinding`, including `wsOperation` or `DMI` settings, to be switched on a per-component or per-request basis.

      For example, by setting the `fetchOperation` on a particular ListGrid, you could cause it to invoke a different server method via DMI, different `dataURL` or different `web service operation`.

      The `operationId` can also be directly received by the server in order to affect behavior. When using the Smart GWT Server, `operationId` can be accessed via dsRequest.getOperationId(). The `RestDataSource` will also send the `operationId` to the server as part of the `request metadata`.

      Note that if you `manually invoke` a DataSource operation, you can also specify operationId via the `requestProperties` parameter.

      Note that the `operationId` has special significance in terms of whether two DSRequests are considered equivalent for caching and synchronization purposes - see `DsRequestEquivalence`.

      Returns:
        Current operationId value. Default value is null
      See Also:
        `Operations overview and related methods`

    - #### setOperationType

          public void setOperationType(DSOperationType operationType)

      Type of operation being performed: "fetch", "add", "remove", "update" or "custom".

      This property is generally automatically populated, for example when calling `fetchData()` on a DataSource or DataBound component the operationType is automatically set to "fetch". Note that "custom" operations are never generated automatically, they are always fired by your code.

      Parameters:
        `operationType` - New operationType value. Default value is null

    - #### getOperationType

          public DSOperationType getOperationType()

      Type of operation being performed: "fetch", "add", "remove", "update" or "custom".

      This property is generally automatically populated, for example when calling `fetchData()` on a DataSource or DataBound component the operationType is automatically set to "fetch". Note that "custom" operations are never generated automatically, they are always fired by your code.

      Returns:
        Current operationType value. Default value is null

    - #### setOutputs

          public void setOutputs(java.lang.String outputs)

      The list of fields to return in the response, specified as a comma-separated string (eg, `"foo, bar, baz"`). You can use this property to indicate to the server that you are only interested in a subset of the fields that would normally be returned.

      Note that you cannot use this property to request a superset of the fields that would normally be returned, because that would be a security hole. It is possible to configure individual `OperationBinding`s to return extra fields, but this must be done in the server's `DataSource` descriptor; it cannot be altered on the fly from the client side.

      Parameters:
        `outputs` - New outputs value. Default value is null
      See Also:
        `OperationBinding.outputs`, `setAdditionalOutputs(java.lang.String)`

    - #### getOutputs

          public java.lang.String getOutputs()

      The list of fields to return in the response, specified as a comma-separated string (eg, `"foo, bar, baz"`). You can use this property to indicate to the server that you are only interested in a subset of the fields that would normally be returned.

      Note that you cannot use this property to request a superset of the fields that would normally be returned, because that would be a security hole. It is possible to configure individual `OperationBinding`s to return extra fields, but this must be done in the server's `DataSource` descriptor; it cannot be altered on the fly from the client side.

      Returns:
        Current outputs value. Default value is null
      See Also:
        `OperationBinding.outputs`, `getAdditionalOutputs()`

    - #### getParentNode

          public TreeNode getParentNode()

      For advanced use in integrating trees that `load data on demand` with web services, `parentNode` is automatically set in "fetch" DSRequests issued by a databound TreeGrid that is loading children for that `parentNode`.

      This is sometimes needed if a web service requires that additional properties beyond the ID of the parentNode must be passed in order to accomplished level-by-level loading. A custom implementation of `DataSource.transformRequest()` can access dsRequest.parentNode and add any such properties to `data`.

      `parentNode` will also be automatically set by a TreeGrid performing databound reparenting of nodes, as implemented by `TreeGrid.folderDrop()`.

      This property can only be read. There is no meaning to setting this property yourself.

      Returns:
        Current parentNode value. Default value is null

    - #### setPendingAdd

          public void setPendingAdd(java.lang.Boolean pendingAdd)

      Indicates that a validation request is being made for a record that will ultimately be saved with an "add" request, as opposed to an "update" request. This context is necessary for some validators because the nature of the validation depends on whether we are adding or updating a record. The system sets this flag when processing interim validations, such as those fired when `DynamicForm.validateOnChange` is in force.
      Parameters:
        `pendingAdd` - New pendingAdd value. Default value is null

    - #### getPendingAdd

          public java.lang.Boolean getPendingAdd()

      Indicates that a validation request is being made for a record that will ultimately be saved with an "add" request, as opposed to an "update" request. This context is necessary for some validators because the nature of the validation depends on whether we are adding or updating a record. The system sets this flag when processing interim validations, such as those fired when `DynamicForm.validateOnChange` is in force.
      Returns:
        Current pendingAdd value. Default value is null

    - #### setProgressiveLoading

          public void setProgressiveLoading(java.lang.Boolean progressiveLoading)

      Sets `progressive loading mode` for this specific request, overriding the OperationBinding- and DataSource-level settings. Note that this setting applies only to fetch requests - it has no effect if specified on any other kind of request.
      Parameters:
        `progressiveLoading` - New progressiveLoading value. Default value is null
      See Also:
        `DataSource.setProgressiveLoading(java.lang.Boolean)`, `OperationBinding.progressiveLoading`, `ProgressiveLoading overview and related methods`

    - #### getProgressiveLoading

          public java.lang.Boolean getProgressiveLoading()

      Sets `progressive loading mode` for this specific request, overriding the OperationBinding- and DataSource-level settings. Note that this setting applies only to fetch requests - it has no effect if specified on any other kind of request.
      Returns:
        Current progressiveLoading value. Default value is null
      See Also:
        `DataSource.getProgressiveLoading()`, `OperationBinding.progressiveLoading`, `ProgressiveLoading overview and related methods`

    - #### getRequestId

          public java.lang.String getRequestId()

      Automatically generated unique ID for this request. This ID will be required by developers making use of the `"clientCustom" dataProtocol`.
      Returns:
        Current requestId value. Default value is varies

    - #### getResultSet

          public ResultSet getResultSet()

      For advanced use in integrating dataset paging with web services, the ResultSet that issued this "fetch" DSRequest is automatically made available as the `resultSet` property.

      This property can only be read. There is no meaning to setting this property yourself.

      Returns:
        Current resultSet value. Default value is null

    - #### getResultTree

          public ResultTree getResultTree()

      For advanced use in integrating trees that `load data on demand` with web services, the ResultTree that issued this "fetch" DSRequest is automatically made available as the `resultTree` property.

      This property can only be read. There is no meaning to setting this property yourself.

      Returns:
        Current resultTree value. Default value is null

    - #### setShouldUseCache

          public void setShouldUseCache(java.lang.Boolean shouldUseCache)

      This is a per-request flag for explicitly controlling whether the cache is used (bypassing it when not wanted, or using it when settings would indicate otherwise). See `DataSource.cacheAllData`, `DataSource.cacheAllOperationId` and `DataSource.cacheAcrossOperationIds` for caching management for all requests of a dataSource.
      Parameters:
        `shouldUseCache` - New shouldUseCache value. Default value is null

    - #### getShouldUseCache

          public java.lang.Boolean getShouldUseCache()

      This is a per-request flag for explicitly controlling whether the cache is used (bypassing it when not wanted, or using it when settings would indicate otherwise). See `DataSource.cacheAllData`, `DataSource.cacheAllOperationId` and `DataSource.cacheAcrossOperationIds` for caching management for all requests of a dataSource.
      Returns:
        Current shouldUseCache value. Default value is null

    - #### setStartRow

          public void setStartRow(java.lang.Integer startRow)

      Starting row of requested results, used only with fetch operations. If unset, 0 is assumed.

      Note that startRow and endRow are zero-based, inclusive at the beginning and exclusive at the end (like substring), so startRow: 0, endRow: 1 is a request for the first record.

      Parameters:
        `startRow` - New startRow value. Default value is null

    - #### getStartRow

          public java.lang.Integer getStartRow()

      Starting row of requested results, used only with fetch operations. If unset, 0 is assumed.

      Note that startRow and endRow are zero-based, inclusive at the beginning and exclusive at the end (like substring), so startRow: 0, endRow: 1 is a request for the first record.

      Returns:
        Current startRow value. Default value is null

    - #### setStreamResults

          public void setStreamResults(boolean streamResults)

      If true, results will be streamed on the server, rather than all records being read into server memory at once; this approach is appropriate for retrieving or exporting large datasets without swamping the server.

      Although this property can be set without any particular concerns (small datasets can be streamed just as readily as large ones), bear in mind that although streaming enables the processing of very large datasets, processing and downloading very large datasets in a normal client/server flow will very rarely give an acceptable user experience. Streaming is of more practical use in a batch setting - for example, a disconnected `export`.

      Note that streaming requires specific server support; of Smart GWT's built-in DataSource types, only `SQLDataSource` is able to stream results. This property is ignored by other DataSource types. If you wish to implement the necessary server-side behavior to support streaming with a custom DataSource, see the the server-side Javadocs for `DSResponse.hasNextRecord()` and `DSResponse.nextRecordAsObject()`.

      See also the server-side documentation for `DSResponse`, `SQLDataSource` and `StreamingResponseIterator`.

      Note, that streaming results does not support fields with `"concat" summary function` on non-Oracle databases. Such fields will be skipped.

      Parameters:
        `streamResults` - New streamResults value. Default value is false

    - #### getStreamResults

          public boolean getStreamResults()

      If true, results will be streamed on the server, rather than all records being read into server memory at once; this approach is appropriate for retrieving or exporting large datasets without swamping the server.

      Although this property can be set without any particular concerns (small datasets can be streamed just as readily as large ones), bear in mind that although streaming enables the processing of very large datasets, processing and downloading very large datasets in a normal client/server flow will very rarely give an acceptable user experience. Streaming is of more practical use in a batch setting - for example, a disconnected `export`.

      Note that streaming requires specific server support; of Smart GWT's built-in DataSource types, only `SQLDataSource` is able to stream results. This property is ignored by other DataSource types. If you wish to implement the necessary server-side behavior to support streaming with a custom DataSource, see the the server-side Javadocs for `DSResponse.hasNextRecord()` and `DSResponse.nextRecordAsObject()`.

      See also the server-side documentation for `DSResponse`, `SQLDataSource` and `StreamingResponseIterator`.

      Note, that streaming results does not support fields with `"concat" summary function` on non-Oracle databases. Such fields will be skipped.

      Returns:
        Current streamResults value. Default value is false

    - #### setTextMatchStyle

          public void setTextMatchStyle(TextMatchStyle textMatchStyle)

      For "fetch" operations, how search criteria should be interpreted for text fields: one of "exact" for exact match, "exactCase" for case-sensitive exact match, "startsWith" for matching at the beginning only, or "substring" for substring match. All `textMatchStyle` settings except "exactCase" are case-insensitive; use `AdvancedCriteria` for greater control over matching.

      This property defaults to the value of `DataSource.defaultTextMatchStyle` if it is not explicitly provided on the `DSRequest`. Note, however, that DSRequests issued by `ListGrid`s and other `components` will generally have a setting for textMatchStyle on the component itself (see `ListGrid.autoFetchTextMatchStyle`, for example).

      This setting is respected by the built-in server-side connectors for SQL, JPA and Hibernate. A custom server-side DataSource implementation should generally respect this flag as well, or server-side filtering will not match client-side filtering, which will require `disabling client-side filtering`, a huge performance loss.

      Parameters:
        `textMatchStyle` - New textMatchStyle value. Default value is null

    - #### getTextMatchStyle

          public TextMatchStyle getTextMatchStyle()

      For "fetch" operations, how search criteria should be interpreted for text fields: one of "exact" for exact match, "exactCase" for case-sensitive exact match, "startsWith" for matching at the beginning only, or "substring" for substring match. All `textMatchStyle` settings except "exactCase" are case-insensitive; use `AdvancedCriteria` for greater control over matching.

      This property defaults to the value of `DataSource.defaultTextMatchStyle` if it is not explicitly provided on the `DSRequest`. Note, however, that DSRequests issued by `ListGrid`s and other `components` will generally have a setting for textMatchStyle on the component itself (see `ListGrid.autoFetchTextMatchStyle`, for example).

      This setting is respected by the built-in server-side connectors for SQL, JPA and Hibernate. A custom server-side DataSource implementation should generally respect this flag as well, or server-side filtering will not match client-side filtering, which will require `disabling client-side filtering`, a huge performance loss.

      Returns:
        Current textMatchStyle value. Default value is null

    - #### setUseFlatFields

          public void setUseFlatFields(java.lang.Boolean useFlatFields)

      When `useFlatFields` is set for a request to be sent to a WSDL web service, when creating the input XML message to send to the web service, properties in `request.data` will be used as the values for XML elements of the same name, at any level of nesting.

      `useFlatFields` allows you to ignore gratuitous XML message structure, such as extra levels of nested elements, and provides some insulation against changes in the required structure of the input message.

      For example, given this input message:

            <FindServices>
                <searchFor>search text</searchFor>
                <Options>
                    <caseSensitive>false</caseSensitive>
                </Options>
                <IncludeInSearch>
                    <serviceName>true</serviceName>
                    <documentation>true</documentation>
                    <keywords>true</keywords>
                </IncludeInSearch>
            </FindServices>

      If `useFlatFields` were not set, in order to fill out this message correctly, `request.data` would need to be:

          {
               searchFor: "search text",
               Options : {
                   caseSensitive: false,
               },
               IncludeInSearch : {
                   serviceName: true,
                   documentation : true,
                   keywords : true
               }
            }

      However if useFlatFields were set, `request.data` could be just:

          {
               searchFor: "search text",
               caseSensitive: false,
               serviceName: true,
               documentation : true,
               keywords : true
            }

      `useFlatFields` is often set when the input data comes from a `DynamicForm` to avoid the cumbersome and fragile process of mapping input fields to an XML structure.

      `OperationBinding.useFlatFields` can also be set to cause all dsRequests of a particular type to `useFlatFields` automatically.

      For `DataBoundComponents`, `component.useFlatFields` can be set use "flattened" binding to fields of a WSDL message or XML Schema.

      Note that `useFlatFields` is not generally recommended for use with XML input messages where multiple simple type fields exist with the same name, however if used in this way, the first field to use a given name wins. "first" means the first field encountered in a depth first search. "wins" means only the first field will be populated in the generated XML message.

      Parameters:
        `useFlatFields` - New useFlatFields value. Default value is null

    - #### getUseFlatFields

          public java.lang.Boolean getUseFlatFields()

      When `useFlatFields` is set for a request to be sent to a WSDL web service, when creating the input XML message to send to the web service, properties in `request.data` will be used as the values for XML elements of the same name, at any level of nesting.

      `useFlatFields` allows you to ignore gratuitous XML message structure, such as extra levels of nested elements, and provides some insulation against changes in the required structure of the input message.

      For example, given this input message:

            <FindServices>
                <searchFor>search text</searchFor>
                <Options>
                    <caseSensitive>false</caseSensitive>
                </Options>
                <IncludeInSearch>
                    <serviceName>true</serviceName>
                    <documentation>true</documentation>
                    <keywords>true</keywords>
                </IncludeInSearch>
            </FindServices>

      If `useFlatFields` were not set, in order to fill out this message correctly, `request.data` would need to be:

          {
               searchFor: "search text",
               Options : {
                   caseSensitive: false,
               },
               IncludeInSearch : {
                   serviceName: true,
                   documentation : true,
                   keywords : true
               }
            }

      However if useFlatFields were set, `request.data` could be just:

          {
               searchFor: "search text",
               caseSensitive: false,
               serviceName: true,
               documentation : true,
               keywords : true
            }

      `useFlatFields` is often set when the input data comes from a `DynamicForm` to avoid the cumbersome and fragile process of mapping input fields to an XML structure.

      `OperationBinding.useFlatFields` can also be set to cause all dsRequests of a particular type to `useFlatFields` automatically.

      For `DataBoundComponents`, `component.useFlatFields` can be set use "flattened" binding to fields of a WSDL message or XML Schema.

      Note that `useFlatFields` is not generally recommended for use with XML input messages where multiple simple type fields exist with the same name, however if used in this way, the first field to use a given name wins. "first" means the first field encountered in a depth first search. "wins" means only the first field will be populated in the generated XML message.

      Returns:
        Current useFlatFields value. Default value is null

    - #### setUseFlatHeaderFields

          public void setUseFlatHeaderFields(java.lang.Boolean useFlatHeaderFields)

      Cause the `useFlatFields` XML serialization behavior to be used for all soap headers in the request. See also `headerData`.
      Parameters:
        `useFlatHeaderFields` - New useFlatHeaderFields value. Default value is null

    - #### getUseFlatHeaderFields

          public java.lang.Boolean getUseFlatHeaderFields()

      Cause the `useFlatFields` XML serialization behavior to be used for all soap headers in the request. See also `headerData`.
      Returns:
        Current useFlatHeaderFields value. Default value is null

    - #### setUseStrictJSON

          public void setUseStrictJSON(java.lang.Boolean useStrictJSON)

      Should the HTTP response to this request 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 requests sent a server with `DataSource.dataFormat` set to "json" or "iscServer".

      Overrides:
        `setUseStrictJSON` in class `RPCRequest`
      Parameters:
        `useStrictJSON` - New useStrictJSON value. Default value is null
      See Also:
        `setUseStrictJSON(java.lang.Boolean)`

    - #### getUseStrictJSON

          public java.lang.Boolean getUseStrictJSON()

      Should the HTTP response to this request 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 requests sent a server with `DataSource.dataFormat` set to "json" or "iscServer".

      Overrides:
        `getUseStrictJSON` in class `RPCRequest`
      Returns:
        Current useStrictJSON value. Default value is null
      See Also:
        `getUseStrictJSON()`

    - #### setValidationMode

          public void setValidationMode(ValidationMode validationMode)

      Mode of validation for entered data.
      Parameters:
        `validationMode` - New validationMode value. Default value is "full"

    - #### getValidationMode

          public ValidationMode getValidationMode()

      Mode of validation for entered data.
      Returns:
        Current validationMode value. Default value is "full"

    - #### setAttribute

          public void setAttribute(java.lang.String property,
                                   java.lang.Object value)

      Set a custom attribute value on the DSRequest as an Object. Note that this method converts the Java primitive Object types, Dates and Maps to the underyling JavaScriptObject value. All other object types are set as Object type attributes and users are expected to call `DataClass.getAttributeAsObject(String)` in order to retrieve them.

      These attributes are available for client-side use only - these attributes are not transmitted to the server.

      Do not use setAttribute() to set any attribute for which there is a dedicated setter (do not setAttribute("data", data) for example).

      If you are looking for a way to send additional data to the server, read `DsRequestEquivalence` for the best approach.

      Overrides:
        `setAttribute` in class `DataClass`
      Parameters:
        `property` - the attribute name
        `value` - the attribute value.

    - #### setParams

          public void setParams(java.util.Map params)

      Description copied from class: `RPCRequest`
      Values to be sent as simple HTTP params, as a JavaScript Object where each property/value pair will become an HTTP parameter name and value. These parameters are then accessible on the server, for example, using servletRequest.getParameter(paramName) in Java Servlets.

      Array-valued parameters will be submitted as multiple instances of the same parameter, similar to an HTML form with a multi-select (?paramName=value1&paramName=value2 ...), accessible as getParameterValues(paramName) in Java Servlets. Any non-atomic type, such as an Object, will be serialized to JSON by the `JSONEncoder`. If this isn't desirable, serialize the data in advance so that the value provided in `rpcRequest.params` is a String.

      Note that this API is primarily used in combination with `useSimpleHttp` - when contacting the Smart GWT Server, use `data` instead, which provides full JavaScript <-> Java translation of arbitrary structures. `rpcRequest.params` can also be used with the Smart GWT Server, where it provides an an opportunity to send additional data aside from the main `data` payload. This is useful for adding data to DataSource requests which will be kept separate from the automatically sent DataSource data, or for making parts of the request visible in the URL for HTTP-level logging or layer 4 switches.

      Note that in contrast to `data` object, the data in `rpcRequest.params` is not deserialized by the Smart GWT server, and all values arrive on the server as String type (like HTTP parameters always do).

      Note: The params are submitted once per http transaction. If you are using `request queuing` to bundle multiple RPCRequests or DSRequests into a single HTTP turnaround, the params from the various RPCRequests will be merged, with the later-queued transactions winning on parameter name collisions. A warning will be logged in the Developer Console if multiple RPCRequests specified params.

      Overrides:
        `setParams` in class `RPCRequest`
      Parameters:
        `params` - New params value. Default value is null

    - #### setCallback

          public final void setCallback(DSCallback callback)

    - #### setSortBy

          public void setSortBy(SortSpecifier[] sortSpecifiers)

      Fieldnames to sortBy.
      Parameters:
        `sortSpecifiers` - Default value is null

    - #### getSortBy

          public SortSpecifier[] getSortBy()

      Fieldname to sortBy
      Returns:
        SortSpecifier array

    - #### setSummaryFunctions

          public void setSummaryFunctions(java.util.Map<java.lang.String,SummaryFunctionType> summaryFunctions)

      A mapping from field names to summary functions to be applied to each field.

      Valid only for an operation of type "fetch". See the Server Summaries overview in the client-side documentation for details and examples of usage.

      NOTE: this feature is supported only in Power Edition or above, and only when using the built-in SQL, JPA or Hibernate connectors.

      Parameters:
        `summaryFunctions` - `Map<String,SummaryFunction>` with field names as keys and summary functions as values.
      See Also:
        `DSRequest.setGroupBy(String[])`

    - #### getSummaryFunctions

          public java.util.Map<java.lang.String,SummaryFunctionType> getSummaryFunctions()

      A mapping from field names to summary functions to be applied to each field.

      Valid only for an operation of type "fetch". See the Server Summaries overview in the client-side documentation for details and examples of usage.

      NOTE: this feature is supported only in Power Edition or above, and only when using the built-in SQL, JPA or Hibernate connectors.

      Returns:
        `Map<String,SummaryFunction>` with field names as keys and summary functions as values.
      See Also:
        `DSRequest.getGroupBy()`

    - #### setOldValues

          public void setOldValues(java.util.Map oldValues)

      For an `update` or `remove` operation, the original values from the record that is being updated or removed. `oldValues` is automatically added to DSRequests submitted by DataBound Components. Available on the server via `DSRequest.getOldValues()`.

      The server can compare the `oldValues` to the most recent stored values in order to detect that the user was looking at stale values when the user submitted changes (NOTE: this means of detecting concurrent edit is sometimes called "optimistic concurrency" or "long transactions").

      In applications where a policy of "last update wins" is not appropriate when updating certain fields, special UI can be shown for this case. For example, on detecting concurrent edit, the server may send back a special `dsResponse.status` code that the client application detects, offering the user a choice of proceeding with the operation, discarding edits, or reconciling new and old values in a special interface.

      Parameters:
        `oldValues` - oldValues Default value is null

    - #### setOldValues

          public void setOldValues(com.google.gwt.core.client.JavaScriptObject oldValues)

      For an `update` or `remove` operation, the original values from the record that is being updated or removed. `oldValues` is automatically added to DSRequests submitted by DataBound Components. Available on the server via `DSRequest.getOldValues()`.

      The server can compare the `oldValues` to the most recent stored values in order to detect that the user was looking at stale values when the user submitted changes (NOTE: this means of detecting concurrent edit is sometimes called "optimistic concurrency" or "long transactions").

      In applications where a policy of "last update wins" is not appropriate when updating certain fields, special UI can be shown for this case. For example, on detecting concurrent edit, the server may send back a special `dsResponse.status` code that the client application detects, offering the user a choice of proceeding with the operation, discarding edits, or reconciling new and old values in a special interface.

      Parameters:
        `oldValues` - oldValues Default value is null

    - #### getCriteria

          public Criteria getCriteria()
                               throws java.lang.IllegalStateException

      Return the Criteria associated with a FETCH operation.

      Note : This method should only be called during a FETCH operation

      Returns:
        the criteria
      Throws:
        `java.lang.IllegalStateException` - if called for a non-fetch operation

    - #### setSkinName

          public void setSkinName(java.lang.String skinName)

      Set the skin to use. For example: Enterprise
      Parameters:
        `skinName` - the name of the selected skin.

    - #### setCriteria

          public void setCriteria(Criteria criteria)

      This method applies to "fetch" requests only; for update or delete operations pass a Record to setData() which contains primaryKey values as Record attributes.

      If you need to do a remove with criteria rather than a primary key, the recommended approach is to do it via a `custom operation`. so the intent is clear. You can also do it as a remove, but just use `DSRequest.oldValues` as the source for whatever criteria values you need. That covers everything except `AdvancedCriteria`.

      Parameters:
        `criteria` - the criteria to store.