DataSource (SmartClient Enterprise Server API 12.1p (2024-12-03))

java.lang.Object
- com.isomorphic.base.Base
- - com.isomorphic.datasource.DataSource

All Implemented Interfaces:

IToJSON

Direct Known Subclasses:

BasicDataSource
```
public class DataSource
extends Base
implements IToJSON
```
A DataSource is metadata that provides a high-level, implementation independent description of a set of permanently stored objects that will be manipulated within a SmartClient application.
The server-side DataSource object supports declarative validation, XPath-based mapping of DataSource fields to Java Objects and XML structures, and dynamic instantiation from XML. See the client reference for the client-side capabilities of DataSource objects.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`OP_ADD` Constant specifying the add operation.
`static java.lang.String`	`OP_CLIENT_EXPORT` Constant specifying a clientExport operation.
`static java.lang.String`	`OP_CUSTOM` Constant specifying a custom operation.
`static java.lang.String`	`OP_DOWNLOAD_FILE` Constant specifying the downloadFile operation. See the Binary Fields overview in the client-side reference for further details.
`static java.lang.String`	`OP_FETCH` Constant specifying the fetch operation.
`static java.lang.String`	`OP_GET_FILE` Constant specifying a getFile operation.
`static java.lang.String`	`OP_GET_FILE_VERSION` Constant specifying a getFileVersion operation.
`static java.lang.String`	`OP_HAS_FILE` Constant specifying a hasFile operation.
`static java.lang.String`	`OP_HAS_FILE_VERSION` Constant specifying a hasFileVersion operation.
`static java.lang.String`	`OP_LIST_FILE_VERSIONS` Constant specifying a listFileVersions operation.
`static java.lang.String`	`OP_LIST_FILES` Constant specifying a listFiles operation.
`static java.lang.String`	`OP_LOAD_SCHEMA` Constant specifying the loadSchema operation. This is an operation used by the client-side framework to load the field definitions from a DataSource, and it is not customizable.
`static java.lang.String`	`OP_REMOVE` Constant specifying the remove operation.
`static java.lang.String`	`OP_REMOVE_FILE` Constant specifying a removeFile operation.
`static java.lang.String`	`OP_REMOVE_FILE_VERSION` Constant specifying a removeFileVersion operation.
`static java.lang.String`	`OP_RENAME_FILE` Constant specifying a renameFile operation.
`static java.lang.String`	`OP_SAVE_FILE` Constant specifying a saveFile operation.
`static java.lang.String`	`OP_UNIQUE_NAME` Constant specifying a uniqueName operation.
`static java.lang.String`	`OP_UPDATE` Constant specifying the update operation.
`static java.lang.String`	`OP_VALIDATE` Constant specifying the validate operation.
`static java.lang.String`	`OP_VIEW_FILE` Constant specifying the viewFile operation. See the Binary Fields overview in the client-side reference for further details.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`long`	`add(java.lang.Object values)` This convenience method is the equivalent of creating a DSRequest with an operationType of "add", calling setValues() on it, and then calling its execute() method.
`long`	`add(java.lang.Object values, RPCManager rpc)` This convenience method is the equivalent of creating a DSRequest with an operationType of "add", calling setValues() and setRPCManager() on it, and then calling its execute() method.
`static void`	`addDynamicDSGenerator(DynamicDSGenerator ddsg)` Registers the parameter DynamicDSGenerator with the DataSource system by placing it at the top of a stack of DynamicDSGenerators.
`static void`	`addDynamicDSGenerator(DynamicDSGenerator ddsg, java.util.regex.Pattern regex)` Registers the parameter DynamicDSGenerator with the DataSource system.
`static void`	`addDynamicDSGenerator(DynamicDSGenerator ddsg, java.lang.String prefix)` Registers the parameter DynamicDSGenerator with the DataSource system.
`static void`	`clearDynamicDSGenerators()` Removes all user-added DynamicDSGenerators from the system
`static AdvancedCriteria`	`convertRelativeDates(AdvancedCriteria advancedCriteria)` Converts all relative dates in a critierion to absolute dates relative to the time when this method is called.
`static AdvancedCriteria`	`convertRelativeDates(AdvancedCriteria advancedCriteria, java.util.Date baseDate)` Converts all relative dates in a critierion to absolute dates relative to the time when this method is called.
`static Criterion`	`convertRelativeDates(Criterion criterion)` Converts all relative dates in a critierion to absolute dates relative to the time when this method is called.
`static Criterion`	`convertRelativeDates(Criterion criterion, java.util.Date baseDate, DataSource ds)` Converts all relative dates in a critierion to absolute dates relative to the time provided as base date.
`static Criterion`	`convertRelativeDates(Criterion criterion, java.util.Date baseDate, DataSource ds, boolean useEmbeddedTZ)` Converts all relative dates in a critierion to absolute dates relative to the time provided as base date.
`DSResponse`	`execute(DSRequest req)` This method carries out the actual processing of a DataSource request.
`DSResponse`	`executeAdd(DSRequest req)` This method is called by DataSource.execute() for "add" operations.
`DSResponse`	`executeClientExport(DSRequest req)` This method is called by DataSource.execute() for "clientExport" operations.
`DSResponse`	`executeCustom(DSRequest req)` This method is called by DataSource.execute() for "custom" operations.
`DSResponse`	`executeFetch(DSRequest req)` This method is called by DataSource.execute() for "fetch" operations.
`DSResponse`	`executeFileSource(DSRequest req)` This method is called by DataSource.execute() for "fileSource" operations.
`DSResponse`	`executeRemove(DSRequest req)` This method is called by DataSource.execute() for "remove" operations.
`DSResponse`	`executeUpdate(DSRequest req)` This method is called by DataSource.execute() for "update" operations.
`java.util.List`	`fetch(java.lang.Object criteria)` This convenience method is the equivalent of creating a DSRequest with an operationType of "fetch", calling setCriteria() on it, and then calling its execute() method.
`java.util.List`	`fetch(java.lang.String key, java.lang.Object value)` This convenience method is the equivalent of creating a DSRequest with an operationType of "fetch", calling setCriteria() on it, and then calling its execute() method.
`java.util.Map`	`fetchById(java.lang.Object id)` Same as `DataSource.fetchById(Object, RPCManager)`, without the optional RPCManager parameter
`java.util.Map`	`fetchById(java.lang.Object id, RPCManager rpc)` Returns the record whose primary key matches the supplied id, or null if no such record exists.
`java.util.Map`	`fetchSingle(java.lang.Object criteria)` This convenience method is the equivalent of creating a DSRequest with an operationType of "fetch", calling setCriteria() on it, calling its execute() method, then obtaining just the first item of the results.
`java.util.Map`	`fetchSingle(java.lang.String key, java.lang.Object value)` This convenience method is the equivalent of creating a DSRequest with an operationType of "fetch", calling setCriteria() on it, calling its execute() method, then obtaining just the first item of the results.
`java.util.List`	`filter(java.lang.Object criteria)` This convenience method is the equivalent of creating a DSRequest with an operationType of "filter", calling setCriteria() on it, and then calling its execute() method.
`java.util.List`	`filter(java.lang.String key, java.lang.Object value)` This convenience method is the equivalent of creating a DSRequest with an operationType of "filter", calling setCriteria() on it, and then calling its execute() method.
`static DataSource`	`fromXML(org.w3c.dom.Document doc)` Instantiates a DataSource from an XML Document - the documentElement of this document is expected to contain the DataSource definition.
`static DataSource`	`fromXML(org.w3c.dom.Document doc, DSRequest dsRequest)` Instantiates a DataSource from an XML Document, with optional context DSRequest - the documentElement of the XML document is expected to contain the DataSource definition.
`static DataSource`	`fromXML(org.w3c.dom.Element elem)` Instantiates a DataSource from an XML Element
`static DataSource`	`fromXML(org.w3c.dom.Element elem, DSRequest dsRequest)` Instantiates a DataSource from an XML Element, with optional context DSRequest
`static DataSource`	`fromXML(java.io.Reader reader)` Instantiates a DataSource from XML using a Reader
`static DataSource`	`fromXML(java.io.Reader reader, DSRequest dsRequest)` Instantiates a DataSource from XML using a Reader, with optional context DSRequest
`static DataSource`	`fromXML(java.lang.String xml)` Instantiates a DataSource from a String of XML
`static DataSource`	`fromXML(java.lang.String xml, DSRequest dsRequest)` Instantiates a DataSource from a String of XML, with optional context DSRequest
`java.lang.String`	`getAuditChangedFieldsFieldName()` Get the field name for the audit "changed fields" field configured for this `DataSource`.
`java.lang.String`	`getAuditRevisionFieldName()` Get the field name for the audit revision field configured for this `DataSource`.
`java.lang.String`	`getAuditTimestampFieldName()` Get the field name for the audit timestamp field configured for this `DataSource`.
`java.lang.String`	`getAuditTypeFieldName()` Get the field name for the audit type field configured for this `DataSource`.
`java.lang.String`	`getAuditUserFieldName()` Get the field name for the audit user field configured for this `DataSource`.
`static DynamicDSGenerator`	`getDefaultDynamicDSGenerator()` Returns the default DynamicDSGenerator, or null if there is none
`static java.util.Map`	`getDynamicDSGenerators()` Returns the non-default DynamicDSGenerators (ie, those that were registered against a startsWith string or a regular expression)
`java.lang.String`	`getEnumConstantProperty()` Returns the name of the property this DataSource uses for constant name when translating enumerated types.
`java.lang.String`	`getEnumOrdinalProperty()` Returns the name of the property this DataSource uses for ordinal number when translating enumerated types.
`java.lang.String`	`getEnumTranslateStrategy()` Returns the strategy this DataSource uses for translating Java enumerated types (enums).
`DSField`	`getField(java.lang.String fieldName)` Returns the field definition for the specified field.
`java.util.List`	`getFieldNames()` Returns the list of field names in the DataSource as a List of strings.
`java.io.Reader`	`getFile(DSFileSpec fileSpec)` Gets the contents of a file stored in this DataSource.
`java.io.InputStream`	`getFileAsInputStream(DSFileSpec fileSpec)` Gets the contents of a file stored in this DataSource
`java.lang.String`	`getFileAsString(DSFileSpec fileSpec)` Gets the contents of a file stored in this DataSource
`java.lang.String`	`getFileContentsField()` Get the field name for the fileContents field configured for this DataSource for fileSource operations.
`java.lang.String`	`getFileFormatField()` Get the field name for the fileFormat field configured for this DataSource for fileSource operations.
`java.lang.String`	`getFileNameField()` Get the field name for the fileName field configured for this DataSource for fileSource operations.
`java.lang.String`	`getFileTypeField()` Get the field name for the fileType field configured for this DataSource for fileSource operations.
`java.lang.String`	`getID()` Returns the "ID" property of the dataSource, exactly the same as `DataSource.getName()`
`java.util.List`	`getListProperties(java.util.List list)` Takes a List of beans/Elements/Maps and for all fields on this DataSource that specify a valueXPath, applies the xpath to each object in the List using the Jakarta JXPath library.
`java.util.List`	`getListProperties(java.util.List list, boolean dropExtraFields, boolean dropIgnoredFields)` Takes a List of beans/Elements/Maps and for all fields on this DataSource that specify a valueXPath, applies the xpath to each object in the List using the Jakarta JXPath library.
`java.lang.String`	`getName()` Returns the "ID" property of the dataSource
`java.lang.String`	`getPrimaryKey()` Returns the name of the primary key field.
`java.util.Map`	`getProperties(java.lang.Object obj)` Takes a bean/Element/Map and for all fields on this DataSource that specify a valueXPath, applies the xpath to the object using the Jakarta JXPath library.
`java.util.Map`	`getProperties(java.lang.Object obj, boolean dropExtraFields, boolean dropIgnoredFields)` Takes a bean/Element/Map and for all fields on this DataSource that specify a valueXPath, applies the xpath to the object using the Jakarta JXPath library.
`java.util.Map`	`getProperties(java.lang.Object obj, java.util.Collection propsToKeep)` Takes a bean/Element/Map and for all fields on this DataSource that specify a valueXPath, applies the xpath to the object using the Jakarta JXPath library.
`java.lang.Class`	`getPropertyJavaClass(java.lang.String propertyName, DSField field, java.lang.Object value)` Override point to allow subclasses to dynamically determine the Java class to use for a given property.
`java.lang.String`	`getRecordXPath()` For an XML DataSource, returns the XPath expression used to retrieve the set of XML elements that constitute the records of this DataSource.
`java.util.Map`	`getRelatedDisplayRecord(java.lang.String fieldName, java.lang.Object displayValue)` Deprecated.
`java.util.Map`	`getRelatedDisplayRecord(java.lang.String fieldName, java.lang.Object displayValue, DSRequest dsRequest)` Returns the "related display record" for a given field.
`java.lang.String`	`getTableName()` Returns the tableName property of the dataSource
`java.lang.Object`	`getTransactionObject(DSRequest req)` Returns an object that can be used to manage transactions for this DataSource and other DataSources of the same type and provider.
`static java.lang.Object`	`getTransactionObject(DSRequest req, java.lang.String transactionObjectKey, java.lang.String shortTransactionObjectKey)` Helper method retrieves connection/transaction object for specified type of data source implementation or `null`.
`boolean`	`hasFile(DSFileSpec fileSpec)` Indicates whether a file exists in this DataSource.
`boolean`	`hasRecord(java.util.Map criteria)` Returns true if the dataSource contains at least one record that matches the supplied criteria
`boolean`	`hasRecord(java.lang.String columnName, java.lang.Object value)` Returns true if the dataSource contains at least one record where the columnName matches the value.
`protected void`	`initialized()` This method is called after the DataSource has been initialized allowing further custom initialization.
`static boolean`	`isModificationOperation(java.lang.String operationType)` Convenience method that returns true for operations that modify data and false for those that do not.
`boolean`	`isServerOnly()` Returns true if this datasource has been declared with an attribute of "serverOnly=true".
`java.util.List`	`listFiles(java.lang.Object criteria)` Get a list of files from the DataSource.
`java.util.List`	`listFiles(java.lang.Object criteria, DSRequest context)` Get a list of files from the DataSource.
`java.util.List`	`listFiles(java.lang.String type, java.lang.String format)` Get a list of files from the DataSource.
`java.util.List`	`listFiles(java.lang.String type, java.lang.String format, DSRequest context)` Get a list of files from the DataSource.
`long`	`remove(java.lang.Object criteria)` This convenience method is the equivalent of creating a DSRequest with an operationType of "remove", calling setCriteria() on it, and then calling its execute() method.
`static DynamicDSGenerator`	`removeDynamicDSGenerator()` Unregisters the current default DynamicDSGenerator (ie, the one at the top of the stack).
`static DynamicDSGenerator`	`removeDynamicDSGenerator(java.util.regex.Pattern regex)` Removes the DynamicDSGenerator registered against the parameter regexp Pattern
`static DynamicDSGenerator`	`removeDynamicDSGenerator(java.lang.String prefix)` Removes the DynamicDSGenerator registered against the parameter prefix String
`java.util.List`	`removeFile(DSFileSpec fileSpec)` Remove a file stored in this DataSource.
`java.util.List`	`renameFile(DSFileSpec oldSpec, DSFileSpec newSpec)` Rename a file stored in this DataSource.
`java.util.Map`	`saveFile(DSFileSpec fileSpec, java.lang.Object contents)` Save a file to the DataSource.
`void`	`setEnumConstantProperty(java.lang.String newValue)` Sets the name of the property this DataSource should use for constant name when translating enumerated types.
`void`	`setEnumOrdinalProperty(java.lang.String newValue)` Sets the name of the property this DataSource should use for ordinal number when translating enumerated types.
`void`	`setEnumTranslateStrategy(java.lang.String newValue)` Sets the strategy this DataSource uses to translate enumerated types (objects of type enum).
`void`	`setOmitNullMapValuesInResponse(boolean omitNullMapValuesInResponse)` Configure whether bindings with null values are dropped when sending a `DSResponse` to the browser.
`java.lang.Object`	`setProperties(java.util.Map properties, java.lang.Object target)` Applies all properties in a Map to a target bean by calling setter methods according to the Java Beans naming convention ("name" -> setName()), including recursive traversal of sub-beans and JXPath-based setting of properties in nested beans.
`java.lang.Object`	`transformImportValue(java.lang.String fieldName, java.lang.Object rawValue, java.lang.String defaultStrategy)` Deprecated.
`java.lang.Object`	`transformImportValue(java.lang.String fieldName, java.lang.Object rawValue, java.lang.String defaultStrategy, DSRequest dsRequest)` Transforms the passed-in rawValue and returns the result of the transformation.
`void`	`transformMultipleFields(DSRequest req)` Transforms the values for fields declared multiple:true in the incoming DSRequest.
`void`	`transformMultipleFields(DSResponse res)` Transforms the values for fields declared multiple:true in a DSResponse.
`long`	`update(java.lang.Object criteria, java.lang.Object values)` This convenience method is the equivalent of creating a DSRequest with an operationType of "update", calling setValues() and setCriteria() on it, and then calling its execute() method.
`long`	`update(java.lang.Object criteria, java.lang.Object values, RPCManager rpc)` This convenience method is the equivalent of creating a DSRequest with an operationType of "update", calling setValues(), setCriteria() and setRPCManager() on it, and then calling its execute() method.
`ErrorReport`	`validate(java.util.Map data, boolean reportMissingRequiredFields)` Takes a Map of fieldName -> value (data argument) and validates the data using the validators specified on this dataSource.
`ErrorReport`	`validate(java.util.Map data, boolean reportMissingRequiredFields, ValidationContext context)` Takes a Map of fieldName -> value (data argument) and optional ValidationContext and validates the data using the validators specified on this dataSource.
`ErrorReport`	`validate(java.util.Map data, ErrorReport errors)` Deprecated. Please use `DataSource.validateRecord(Map, ErrorReport, ValidationContext)` instead.
`ErrorReport`	`validateRecord(java.util.Map data, ErrorReport errors, ValidationContext context)` Overriding point to add custom validation, that could not be covered using standard per-field validation.

Methods inherited from interface com.isomorphic.js.IToJSON
toJSON

- Field Detail
  - OP_VIEW_FILE
```
public static final java.lang.String OP_VIEW_FILE
```
    Constant specifying the viewFile operation.
    See the Binary Fields overview in the client-side reference for further details.
    
    See Also:
    
    Constant Field Values
  - OP_DOWNLOAD_FILE
```
public static final java.lang.String OP_DOWNLOAD_FILE
```
    Constant specifying the downloadFile operation.
    See the Binary Fields overview in the client-side reference for further details.
    
    See Also:
    
    Constant Field Values
  - OP_LOAD_SCHEMA
```
public static final java.lang.String OP_LOAD_SCHEMA
```
    Constant specifying the loadSchema operation.
    This is an operation used by the client-side framework to load the field definitions from a DataSource, and it is not customizable.
    
    See Also:
    
    Constant Field Values
  - OP_FETCH
```
public static final java.lang.String OP_FETCH
```
    Constant specifying the fetch operation. The fetch operation typically provides a set of criteria and expects a set of records as a response.
    
    See Also:
    
    Constant Field Values
  - OP_ADD
```
public static final java.lang.String OP_ADD
```
    Constant specifying the add operation. The add operation is a request to add a set of records to a whatever backing store is used as the datasource.
    
    See Also:
    
    Constant Field Values
  - OP_REMOVE
```
public static final java.lang.String OP_REMOVE
```
    Constant specifying the remove operation. The remove operation is a request to remove a set of records from whatever backing store is used as the datasource.
    
    See Also:
    
    Constant Field Values
  - OP_UPDATE
```
public static final java.lang.String OP_UPDATE
```
    Constant specifying the update operation. The update operation typically provides a set of criteria and new values for certain fields and expects that records matching the provided criteria will be updated with the new values.
    
    See Also:
    
    Constant Field Values
  - OP_CUSTOM
```
public static final java.lang.String OP_CUSTOM
```
    Constant specifying a custom operation. SmartClient components do not send operations of this type. It is reserved for programmatic use.
    
    See Also:
    
    Constant Field Values
  - OP_VALIDATE
```
public static final java.lang.String OP_VALIDATE
```
    Constant specifying the validate operation.
    
    See Also:
    
    Constant Field Values
  - OP_CLIENT_EXPORT
```
public static final java.lang.String OP_CLIENT_EXPORT
```
    Constant specifying a clientExport operation. DataBoundComponents send operations of this type when they are bound to a DataSource with a "clientExport" OperationBinding that is named in the call to exportClientData(). These operations can also be sent programmatically, by calling exportClientData() directly on the DataSource, naming the OperationBinding as described above.
    
    See Also:
    
    Constant Field Values
  - OP_GET_FILE
```
public static final java.lang.String OP_GET_FILE
```
    Constant specifying a getFile operation.
    
    See Also:
    
    Constant Field Values
  - OP_HAS_FILE
```
public static final java.lang.String OP_HAS_FILE
```
    Constant specifying a hasFile operation.
    
    See Also:
    
    Constant Field Values
  - OP_LIST_FILES
```
public static final java.lang.String OP_LIST_FILES
```
    Constant specifying a listFiles operation.
    
    See Also:
    
    Constant Field Values
  - OP_SAVE_FILE
```
public static final java.lang.String OP_SAVE_FILE
```
    Constant specifying a saveFile operation.
    
    See Also:
    
    Constant Field Values
  - OP_RENAME_FILE
```
public static final java.lang.String OP_RENAME_FILE
```
    Constant specifying a renameFile operation.
    
    See Also:
    
    Constant Field Values
  - OP_REMOVE_FILE
```
public static final java.lang.String OP_REMOVE_FILE
```
    Constant specifying a removeFile operation.
    
    See Also:
    
    Constant Field Values
  - OP_LIST_FILE_VERSIONS
```
public static final java.lang.String OP_LIST_FILE_VERSIONS
```
    Constant specifying a listFileVersions operation.
    
    See Also:
    
    Constant Field Values
  - OP_GET_FILE_VERSION
```
public static final java.lang.String OP_GET_FILE_VERSION
```
    Constant specifying a getFileVersion operation.
    
    See Also:
    
    Constant Field Values
  - OP_HAS_FILE_VERSION
```
public static final java.lang.String OP_HAS_FILE_VERSION
```
    Constant specifying a hasFileVersion operation.
    
    See Also:
    
    Constant Field Values
  - OP_REMOVE_FILE_VERSION
```
public static final java.lang.String OP_REMOVE_FILE_VERSION
```
    Constant specifying a removeFileVersion operation.
    
    See Also:
    
    Constant Field Values
  - OP_UNIQUE_NAME
```
public static final java.lang.String OP_UNIQUE_NAME
```
    Constant specifying a uniqueName operation.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - setOmitNullMapValuesInResponse
```
public void setOmitNullMapValuesInResponse(boolean omitNullMapValuesInResponse)
```
    Configure whether bindings with null values are dropped when sending a DSResponse to the browser. To send such bindings, both this property and the active DSRequest property by the same name must be set false. (If no setting is specified in the DSRequest, it defaults to RPCManager.omitNullMapValuesInResponse.)
    Rules:
    - SQL nulls never make it to dsResponse.data
    - JPA, Hibernate and other beans that return null for accessors will cause nulls to appear in dsResponse.data
    - JPADataSource and HibernateDataSource automatically set omitNullValuesInResponse since nulls are not usually needed client-side
    - Any custom DataSource or dsResponses provided by DMI will deliver nulls to client by default, whether the provided data is Java Beans, List of Maps, or another format. You should consider setting omitNullMapValuesInResponse to reduce data if nulls are common and your client-side logic doesn't depend on having explicit nulls.
    Parameters:
    
    omitNullMapValuesInResponse - whether to drop bindings with null values
  - addDynamicDSGenerator
```
public static void addDynamicDSGenerator(DynamicDSGenerator ddsg)
```
    Registers the parameter DynamicDSGenerator with the DataSource system by placing it at the top of a stack of DynamicDSGenerators. Whenever the system needs a DataSource in future, it will first call the DynamicDSGenerator.getDataSource(String, DSRequest) method of the DynamicDSGenerator. If that returns null, it will proceed to call the same method on any other DynamicDSGenerators in the stack, in reverse order of their registration (the normal LIFO ordering of a stack). Only if all the registered DynamicDSGenerators return null does the framework revert to the normal system of obtaining a DataSource instance.
    NOTE:
    - If you use this API, your DynamicDSGenerator will be called for every DataSource that the framework needs, including the very large number of internal usages. You probably don't want this - see DataSource.addDynamicDSGenerator(DynamicDSGenerator, String) and DataSource.addDynamicDSGenerator(DynamicDSGenerator, Pattern) for APIs that are more likely to be suitable
    - If you use this API anyway, you must be certain to return null for DataSources that you cannot provide an instance of
    Parameters:
    
    ddsg - A DynamicDSGenerator to register as the new default
    
    See Also:
    
    DataSource.removeDynamicDSGenerator()
  - removeDynamicDSGenerator
```
public static DynamicDSGenerator removeDynamicDSGenerator()
```
    Unregisters the current default DynamicDSGenerator (ie, the one at the top of the stack). Does nothing if there is no current default (ie, if the stack is empty).
    If there are other default DynamicDSGenerators on the stack (because DataSource.addDynamicDSGenerator(DynamicDSGenerator) has been called more than once), the next one in the stack becomes the current default. Otherwise, there is no default DynamicDSGenerator and the framework will fall back to using the normal system for obtaining DataSource instances.
    Note, this API applies only to the stack of default DynamicDSGenerators - ie, those that were not registered against a prefix string or regular expression. It is quite possible to remove the last default DynamicDSGenerator and still have all of your DataSources generated dynamically via the prefix- or regex-based generators. See DataSource.addDynamicDSGenerator(DynamicDSGenerator, String) and DataSource.addDynamicDSGenerator(DynamicDSGenerator, Pattern)
    
    Returns:
    
    the DynamicDSGenerator we just removed, or null
    
    See Also:
    
    DataSource.addDynamicDSGenerator(DynamicDSGenerator, String), DataSource.addDynamicDSGenerator(DynamicDSGenerator, Pattern)
  - addDynamicDSGenerator
```
public static void addDynamicDSGenerator(DynamicDSGenerator ddsg,
                                         java.lang.String prefix)
```
    Registers the parameter DynamicDSGenerator with the DataSource system. The DynamicDSGenerator will only be called for for DataSource ID's which start with the parameter prefix.
    You can add multiple DynamicDSGenerators using this API. If two or more are registered with prefixes that match a given DataSource ID, the one added first wins. Eg, if you have prefixes "c" and "cust" registered, then the "customer" DataSource will be provided by whichever of those two DynamicDSGenerators was registered first. Note that this "earliest first" basis also applies to DynamicDSGenerators registered with a regexp; if you had a DataSource ID that matched both a prefix and a regexp, whichever one of the two registrations came first would be used - there is no priority given to one or the other styles of ID matching.
    
    Parameters:
    
    ddsg - A DynamicDSGenerator to register as the default
    
    prefix - A prefix String as described above
  - addDynamicDSGenerator
```
public static void addDynamicDSGenerator(DynamicDSGenerator ddsg,
                                         java.util.regex.Pattern regex)
```
    Registers the parameter DynamicDSGenerator with the DataSource system. The DynamicDSGenerator will only be called for for DataSource ID's which match the regexp provided in the parameter java.util.regex.Pattern
    You can add multiple DynamicDSGenerators using this API. If two or more are registered with regular expressions that match a given DataSource ID, the one added first wins. This also applies to DynamicDSGenerators registered with a simple prefix String.
    
    Parameters:
    
    ddsg - A DynamicDSGenerator to register as the default
    
    regex - A Pattern representing a regular expression to match against incoming DataSource IDs
  - getDefaultDynamicDSGenerator
```
public static DynamicDSGenerator getDefaultDynamicDSGenerator()
```
    Returns the default DynamicDSGenerator, or null if there is none
    
    Returns:
    
    The default DynamicDSGenerator
  - getDynamicDSGenerators
```
public static java.util.Map getDynamicDSGenerators()
```
    Returns the non-default DynamicDSGenerators (ie, those that were registered against a startsWith string or a regular expression)
    
    Returns:
    
    A map of the non-default DynamicDSGenerators, keyed by the startsWith string or regexp
  - removeDynamicDSGenerator
```
public static DynamicDSGenerator removeDynamicDSGenerator(java.lang.String prefix)
```
    Removes the DynamicDSGenerator registered against the parameter prefix String
    
    Returns:
    
    The DynamicDSGenerator we just removed
  - removeDynamicDSGenerator
```
public static DynamicDSGenerator removeDynamicDSGenerator(java.util.regex.Pattern regex)
```
    Removes the DynamicDSGenerator registered against the parameter regexp Pattern
    
    Returns:
    
    The DynamicDSGenerator we just removed
  - clearDynamicDSGenerators
```
public static void clearDynamicDSGenerators()
```
    Removes all user-added DynamicDSGenerators from the system
  - initialized
```
protected void initialized()
                    throws java.lang.Exception
```
    This method is called after the DataSource has been initialized allowing further custom initialization.
    The default implementation does nothing.
    
    Throws:
    
    java.lang.Exception - if an error occurs during initialization
  - fromXML
```
public static DataSource fromXML(org.w3c.dom.Element elem)
                          throws java.lang.Exception
```
    Instantiates a DataSource from an XML Element
    
    Parameters:
    
    elem - XML Element containing the DataSource definition
    
    Returns:
    
    an instance of DataSource
    
    Throws:
    
    java.lang.Exception - if an error occurs during DataSource instantiation
  - fromXML
```
public static DataSource fromXML(org.w3c.dom.Element elem,
                                 DSRequest dsRequest)
                          throws java.lang.Exception
```
    Instantiates a DataSource from an XML Element, with optional context DSRequest
    
    Parameters:
    
    elem - XML Element containing the DataSource definition
    
    dsRequest - DSRequest to use as a context object if the creation of this DataSource involves the automatic creation of further, possibly user-generated, DataSources (eg, if this DataSource inheritsFrom a user-generated one)
    
    Returns:
    
    an instance of DataSource
    
    Throws:
    
    java.lang.Exception - if an error occurs during DataSource instantiation
  - fromXML
```
public static DataSource fromXML(org.w3c.dom.Document doc)
                          throws java.lang.Exception
```
    Instantiates a DataSource from an XML Document - the documentElement of this document is expected to contain the DataSource definition.
    
    Parameters:
    
    doc - XML Document containing the DataSource definition
    
    Returns:
    
    an instance of DataSource
    
    Throws:
    
    java.lang.Exception - if an error occurs during DataSource instantiation
  - fromXML
```
public static DataSource fromXML(org.w3c.dom.Document doc,
                                 DSRequest dsRequest)
                          throws java.lang.Exception
```
    Instantiates a DataSource from an XML Document, with optional context DSRequest - the documentElement of the XML document is expected to contain the DataSource definition.
    
    Parameters:
    
    doc - XML Document containing the DataSource definition
    
    dsRequest - DSRequest to use as a context object if the creation of this DataSource involves the automatic creation of further, possibly user-generated, DataSources (eg, if this DataSource inheritsFrom a user-generated one)
    
    Returns:
    
    an instance of DataSource
    
    Throws:
    
    java.lang.Exception - if an error occurs during DataSource instantiation
  - fromXML
```
public static DataSource fromXML(java.lang.String xml)
                          throws java.lang.Exception
```
    Instantiates a DataSource from a String of XML
    
    Parameters:
    
    xml - XML string containing the DataSource definition
    
    Returns:
    
    an instance of DataSource
    
    Throws:
    
    java.lang.Exception - if an error occurs during DataSource instantiation
  - fromXML
```
public static DataSource fromXML(java.lang.String xml,
                                 DSRequest dsRequest)
                          throws java.lang.Exception
```
    Instantiates a DataSource from a String of XML, with optional context DSRequest
    
    Parameters:
    
    xml - XML string containing the DataSource definition
    
    dsRequest - DSRequest to use as a context object if the creation of this DataSource involves the automatic creation of further, possibly user-generated, DataSources (eg, if this DataSource inheritsFrom a user-generated one)
    
    Returns:
    
    an instance of DataSource
    
    Throws:
    
    java.lang.Exception - if an error occurs during DataSource instantiation
  - fromXML
```
public static DataSource fromXML(java.io.Reader reader)
                          throws java.lang.Exception
```
    Instantiates a DataSource from XML using a Reader
    
    Parameters:
    
    reader - Reader supplying XML containing the DataSource definition
    
    Returns:
    
    an instance of DataSource
    
    Throws:
    
    java.lang.Exception - if an error occurs during DataSource instantiation
  - fromXML
```
public static DataSource fromXML(java.io.Reader reader,
                                 DSRequest dsRequest)
                          throws java.lang.Exception
```
    Instantiates a DataSource from XML using a Reader, with optional context DSRequest
    
    Parameters:
    
    reader - Reader supplying XML containing the DataSource definition
    
    dsRequest - DSRequest to use as a context object if the creation of this DataSource involves the automatic creation of further, possibly user-generated, DataSources (eg, if this DataSource inheritsFrom a user-generated one)
    
    Returns:
    
    an instance of DataSource
    
    Throws:
    
    java.lang.Exception - if an error occurs during DataSource instantiation
  - getID
```
public java.lang.String getID()
```
    Returns the "ID" property of the dataSource, exactly the same as DataSource.getName()
    
    Returns:
    
    DataSource ID
  - getName
```
public java.lang.String getName()
```
    Returns the "ID" property of the dataSource
    
    Returns:
    
    DataSource ID
  - getTableName
```
public java.lang.String getTableName()
```
    Returns the tableName property of the dataSource
    
    Returns:
    
    DataSource tableName
  - getFieldNames
```
public java.util.List getFieldNames()
```
    Returns the list of field names in the DataSource as a List of strings.
    
    Returns:
    
    the list of field names in the DataSource as a List of strings
  - getPrimaryKey
```
public java.lang.String getPrimaryKey()
```
    Returns the name of the primary key field. Avoid this method for DataSources with composite keys (ie, multiple primaryKey fields): it simply returns the first key field it finds, which will rarely be useful for a composite key.
    
    Returns:
    
    the name of the primary key field
  - getField
```
public DSField getField(java.lang.String fieldName)
```
    Returns the field definition for the specified field.
    
    Parameters:
    
    fieldName - the name of the field whose definition you want
    
    Returns:
    
    the field definition for the specified field
    
    See Also:
    
    DSField
  - getRecordXPath
```
public java.lang.String getRecordXPath()
```
    For an XML DataSource, returns the XPath expression used to retrieve the set of XML elements that constitute the records of this DataSource.
    For example, an "ItemSearch" might return metadata along with the set of <Item> elements that one might want to display in a grid. The XPath expression to retrieve just the <Item> elements in this case might be "//Item", which would select all <Item> elements anywhere in the returned document.
    
    Returns:
    
    the XPath expression
  - isModificationOperation
```
public static boolean isModificationOperation(java.lang.String operationType)
```
    Convenience method that returns true for operations that modify data and false for those that do not.
    
    Returns:
    
    true if operationType is one of "add", "remove" or "update" and false otherwise.
  - transformMultipleFields
```
public void transformMultipleFields(DSRequest req)
```
    Transforms the values for fields declared multiple:true in the incoming DSRequest.
    See client-side docs for DataSourceField.multipleStorage for possible behaviors. This transformation is performed in DataSource.execute(), before operationType-specific methods like executeFetch or executeUpdate() are called.
    
    Parameters:
    
    req - the request to be transformed.
  - transformMultipleFields
```
public void transformMultipleFields(DSResponse res)
```
    Transforms the values for fields declared multiple:true in a DSResponse.
    See client-side docs for DataSourceField.multipleStorage for possible behaviors. This transformation is performed in DataSource.execute(), after operationType-specific methods like executeFetch or executeUpdate() are called.
    
    Parameters:
    
    res - the DSResponse to be transformed.
  - execute
```
public DSResponse execute(DSRequest req)
                   throws java.lang.Exception
```
    This method carries out the actual processing of a DataSource request. It can be overridden to provide centralized logic that applies to all operation types (such as transaction management, for example), or to implement special validation rules that cannot be handled by the built-in validation system. Generally, however, it is more appropriate to override the method specific to the operationType - executeFetch(), executeRemove(), executeAdd(), executeUpdate() or executeCustom(). Note that you must call the validate() method to retain correct validation behavior if you override this method and do not invoke super() This method is also the place where the transform happens if dataSourceField.multipleStorage is used. The transform is performed by two methods, DataSource.transformMultipleFields(DSRequest) and DataSource.transformMultipleFields(DSResponse).
    
    Parameters:
    
    req - The DSRequest object representing this operation
    
    Returns:
    
    A valid DSResponse
    
    Throws:
    
    java.lang.Exception
  - getAuditTypeFieldName
```
public java.lang.String getAuditTypeFieldName()
```
    Get the field name for the audit type field configured for this DataSource.
    
    Returns:
    
    the field name representing the type field configured for the audit DataSource.
  - getAuditRevisionFieldName
```
public java.lang.String getAuditRevisionFieldName()
```
    Get the field name for the audit revision field configured for this DataSource.
    
    Returns:
    
    the field name representing the revision field configured for the audit DataSource.
  - getAuditTimestampFieldName
```
public java.lang.String getAuditTimestampFieldName()
```
    Get the field name for the audit timestamp field configured for this DataSource.
    
    Returns:
    
    the field name representing the timestamp field configured for the audit DataSource.
  - getAuditUserFieldName
```
public java.lang.String getAuditUserFieldName()
```
    Get the field name for the audit user field configured for this DataSource.
    
    Returns:
    
    the field name representing the user field configured for the audit DataSource.
  - getAuditChangedFieldsFieldName
```
public java.lang.String getAuditChangedFieldsFieldName()
```
    Get the field name for the audit "changed fields" field configured for this DataSource.
    
    Returns:
    
    the field name representing the "changed fields" field configured for the audit DataSource.
  - setProperties
```
public java.lang.Object setProperties(java.util.Map properties,
                                      java.lang.Object target)
```
    Applies all properties in a Map to a target bean by calling setter methods according to the Java Beans naming convention ("name" -> setName()), including recursive traversal of sub-beans and JXPath-based setting of properties in nested beans.
    When DataSourceField.valueXPath is set, the valueXPath is treated as a Jakarta JXPath expression. If some intervening objects in a JXPath are nulls, this method attempts to create missing objects if possible - see JXPathContextObjectFactory documentation for details.
    Entries in the "properties" Map where there is no same-named DataSource field are discarded.
    This method can be used to recursively populate an object graph of Beans and Collections, using multiple DataSources to define rules for how subobjects are populated. Specifically, if the "properties" Map has entries whose values are Maps, if the corresponding field on the DataSource is declared as being of a DataSource type (ie, the type property is set to the ID of some valid DataSource), these properties will be applied via a recursive call to DataSource.setProperties() using the indicated DataSource. This will also occur for a Collection within the "properties" Map if the target bean has a corresponding property of Collection type.
    When the type to use is ambiguous (for example, a property on the target bean is declared as a base type with many sub-types, or is an abstract type like List) the DataSourceField properties javaClass, javaCollectionClass and javaKeyClass can be used to specify a concrete type - see the client-side reference docs for further details.
    Ultimately, this method calls DataTools.setProperties(Map, Object, DataSource) - see the documentation of these method for details of treatment of object vs primitive type, Java Generics, Enums, and other cases.
    
    Parameters:
    
    properties - Map of DataSource fieldName -> value
    
    target - Target object to which the values are to be applied
  - getListProperties
```
public java.util.List getListProperties(java.util.List list)
```
    Takes a List of beans/Elements/Maps and for all fields on this DataSource that specify a valueXPath, applies the xpath to each object in the List using the Jakarta JXPath library. If no valueXPath is specified, this method attempts to treat each object in the List as a bean for that value. Values specified for fieldNames that are not declared in the datasource on which this method is being called are discarded.
    
    Parameters:
    
    list - The List of objects that is mined for values.
    
    Returns:
    
    A List of Maps of fieldNames -> fieldValues derived as described above.
  - getListProperties
```
public java.util.List getListProperties(java.util.List list,
                                        boolean dropExtraFields,
                                        boolean dropIgnoredFields)
```
    Takes a List of beans/Elements/Maps and for all fields on this DataSource that specify a valueXPath, applies the xpath to each object in the List using the Jakarta JXPath library. If no valueXPath is specified, this method attempts to treat each object in the List as a bean for that value. The dropExtraFields parameter controls whether or not values specified for fieldNames that are not declared in the datasource on which this method is being called are discarded.
    
    Parameters:
    
    list - The List of objects that is mined for values.
    
    dropExtraFields - If true, values specified for fieldNames that are not declared in the datasource on which this method is being called are discarded, otherwise they are kept.
    
    dropIgnoredFields - If true, values specified for fieldNames that are declared in the datasource on which this method is being called with the property ignore: true are are discarded; otherwise they are kept
    
    Returns:
    
    A List of Maps of fieldNames -> fieldValues derived as described above.
  - getProperties
```
public java.util.Map getProperties(java.lang.Object obj)
```
    Takes a bean/Element/Map and for all fields on this DataSource that specify a valueXPath, applies the xpath to the object using the Jakarta JXPath library. If no valueXPath is specified, this method attempts to treat the target as a bean for that value. Values specified for fieldNames that are not declared in the datasource on which this method is being called are discarded.
    
    Parameters:
    
    obj - The object that is mined for values.
    
    Returns:
    
    A map of fieldNames -> fieldValues derived as described above.
  - getProperties
```
public java.util.Map getProperties(java.lang.Object obj,
                                   boolean dropExtraFields,
                                   boolean dropIgnoredFields)
```
    Takes a bean/Element/Map and for all fields on this DataSource that specify a valueXPath, applies the xpath to the object using the Jakarta JXPath library. If no valueXPath is specified, this method attempts to treat the target as a bean for that value. The dropExtraFields parameter controls whether or not values specified for fieldNames that are not declared in the datasource on which this method is being called are discarded.
    
    Parameters:
    
    obj - The object that is mined for values.
    
    dropExtraFields - If true, values specified for fieldNames that are not declared in the datasource on which this method is being called are discarded, otherwise they are kept.
    
    dropIgnoredFields - If true, values specified for fieldNames that are declared in the datasource on which this method is being called with the property ignore: true are are discarded; otherwise they are kept
    
    Returns:
    
    A map of fieldNames -> fieldValues derived as described above.
  - getProperties
```
public java.util.Map getProperties(java.lang.Object obj,
                                   java.util.Collection propsToKeep)
```
    Takes a bean/Element/Map and for all fields on this DataSource that specify a valueXPath, applies the xpath to the object using the Jakarta JXPath library. If no valueXPath is specified, this method attempts to treat the target as a bean for that value.
    
    Parameters:
    
    obj - The object that is mined for values.
    
    propsToKeep - specifies an explicit list of properties to retain the datasource on which this method is being called are discarded, otherwise they are kept.
    
    Returns:
    
    A map of fieldNames -> fieldValues derived as described above.
  - validate
```
public ErrorReport validate(java.util.Map data,
                            boolean reportMissingRequiredFields)
                     throws java.lang.Exception
```
    Takes a Map of fieldName -> value (data argument) and validates the data using the validators specified on this dataSource. Note, this version does not merge validated values back into the data
    
    Parameters:
    
    data - Map of DataSource fieldName -> value
    
    reportMissingRequiredFields - for operations like update or fetch/filter only partial fields may be specified by the user. In those cases you want to ignore missing required fields.
    
    Returns:
    
    ErrorReport or null if there were no errors.
    
    Throws:
    
    java.lang.Exception - if an exception occurs during validation
  - validate
```
public ErrorReport validate(java.util.Map data,
                            boolean reportMissingRequiredFields,
                            ValidationContext context)
                     throws java.lang.Exception
```
    Takes a Map of fieldName -> value (data argument) and optional ValidationContext and validates the data using the validators specified on this dataSource. Note, this version does not merge validated values back into the data
    
    Parameters:
    
    data - Map of DataSource fieldName -> value
    
    reportMissingRequiredFields - for operations like update or fetch/filter only partial fields may be specified by the user. In those cases you want to ignore missing required fields.
    
    context - ValidationContext to use during validation; if null is passed, then new ValidationContext will be created. NOTE that if passing validationContext, outer code is responsible to call validationContext.freeResources();
    
    Returns:
    
    ErrorReport or null if there were no errors.
    
    Throws:
    
    java.lang.Exception - if an exception occurs during validation
  - validate
```
@Deprecated
public ErrorReport validate(java.util.Map data,
                                        ErrorReport errors)
                                 throws java.lang.Exception
```
    Deprecated. Please use DataSource.validateRecord(Map, ErrorReport, ValidationContext) instead.
    
    Throws:
    
    java.lang.Exception
  - validateRecord
```
public ErrorReport validateRecord(java.util.Map data,
                                  ErrorReport errors,
                                  ValidationContext context)
                           throws java.lang.Exception
```
    Overriding point to add custom validation, that could not be covered using standard per-field validation. For example based on multiple fields. Add your custom validation errors to existing (if any) validation errors provided in errors parameter and return complete ErrorReport object or null if there were no errors.
    Implementing this method is the right way to introduce whole-record validation behavior that applies to all operationTypes that perform validation ("validate", "add", "update" and possible future types) as well as other contexts where validation is performed, such as the BatchUploader or mass import of records.
    Note this method has no default behavior.
    
    Parameters:
    
    data - Map of DataSource fieldName -> value
    
    errors - ErrorReport with validation errors reported by validators on this datasource, or null if there were no errors.
    
    context - ValidationContext, where record is validated, see ValidationContext javadocs for details.
    
    Returns:
    
    ErrorReport or null if there were no errors.
    
    Throws:
    
    java.lang.Exception - if an exception occurs during validation.
  - executeFetch
```
public DSResponse executeFetch(DSRequest req)
                        throws java.lang.Exception
```
    This method is called by DataSource.execute() for "fetch" operations. It is the appropriate override point if you wish to provide custom handling of a "fetch".
    
    Parameters:
    
    req - The DSRequest object representing this operation
    
    Returns:
    
    A valid DSResponse
    
    Throws:
    
    java.lang.Exception
  - executeRemove
```
public DSResponse executeRemove(DSRequest req)
                         throws java.lang.Exception
```
    This method is called by DataSource.execute() for "remove" operations. It is the appropriate override point if you wish to provide custom handling of a "remove".
    
    Parameters:
    
    req - The DSRequest object representing this operation
    
    Returns:
    
    A valid DSResponse
    
    Throws:
    
    java.lang.Exception
  - executeAdd
```
public DSResponse executeAdd(DSRequest req)
                      throws java.lang.Exception
```
    This method is called by DataSource.execute() for "add" operations. It is the appropriate override point if you wish to provide custom handling of an "add".
    
    Parameters:
    
    req - The DSRequest object representing this operation
    
    Returns:
    
    A valid DSResponse
    
    Throws:
    
    java.lang.Exception
  - executeUpdate
```
public DSResponse executeUpdate(DSRequest req)
                         throws java.lang.Exception
```
    This method is called by DataSource.execute() for "update" operations. It is the appropriate override point if you wish to provide custom handling of an "update".
    
    Parameters:
    
    req - The DSRequest object representing this operation
    
    Returns:
    
    A valid DSResponse
    
    Throws:
    
    java.lang.Exception
  - executeCustom
```
public DSResponse executeCustom(DSRequest req)
                         throws java.lang.Exception
```
    This method is called by DataSource.execute() for "custom" operations. It is the appropriate override point to provide logic for handling a "custom" operation.
    
    Parameters:
    
    req - The DSRequest object representing this operation
    
    Returns:
    
    A valid DSResponse
    
    Throws:
    
    java.lang.Exception
  - executeClientExport
```
public DSResponse executeClientExport(DSRequest req)
                               throws java.lang.Exception
```
    This method is called by DataSource.execute() for "clientExport" operations. It is the appropriate override point to provide logic for handling a "clientExport" operation.
    
    Parameters:
    
    req - The DSRequest object representing this operation
    
    Returns:
    
    A valid DSResponse
    
    Throws:
    
    java.lang.Exception
  - executeFileSource
```
public DSResponse executeFileSource(DSRequest req)
                             throws java.lang.Exception
```
    This method is called by DataSource.execute() for "fileSource" operations. It is the appropriate override point to provide logic for handling a "fileSource" operation.
    The actual operation to be performed is indicated by the request's operationType. The operationType may be one of the following:
    
    getFile, hasFile, listFiles
    
    Return a DSResponse appropriate for a "fetch" operation, using the fileName, fileType and fileFormat (or other criteria) provided by the DSRequest. Only include the fileContents in the outputs for the "getFile" operationType.
    
    saveFile
    
    Return a DSResponse appropriate for an "add" operation, using the fileName, fileType, fileFormat and fileContents provided by the DSRequest (and also potentially a timestamp representing the fileVersion, if the DataSource defines a fileVersionField). Do not include the fileContents in the outputs. Note that the actual operation may be implemented as an "add" or an "update", depending on whether the file exists already, and whether fileVersion is in force
    
    renameFile
    
    Return a DSResponse appropriate for an "update" operation. The existing fileName, fileType and fileFormat are provided in the request's oldValues, since they may be primary keys (so that providing only the new values would not be sufficient).
    
    removeFile
    
    Return a DSResponse appropriate for a "remove" opration, using the fileName, fileType and fileFormat provided by the DSRequest.
    
    In each case, the fileName, fileType, fileFormat and fileContents are provided in the DSRequest using those field names. The default implementation uses getFileNameField(), getFileTypeField(), getFileFormatField() and getFileContentsField() to construct the appropriate sub-request to access the real fields of the DataSource.
    In constructing a DSResponse, you must use the field names fileName, fileType, fileFormat and fileContents rather than the real fields of the DataSource.
    The default implementation issues a sub-request of type "fetch", "add", "remove" or "update", with an operationId equal to the operationType provided here, and with field names translated according the DataSource configuration. Therefore, you can customize the sub-request operationTypes, by checking for the relevant operationId.
    Note that the "renameFile" operationId is implemented, by default, to perform an "update" operation, unless the fileNameField, fileFormatField or fileTypeField are primary keys. If one of those fields is a primary key, then "renameFile" is instead implemented as a "remove" followed by an "add", since there can be difficulties updating primary keys.
    
    Parameters:
    
    req - The DSRequest object representing this operation.
    
    Returns:
    
    A valid DSResponse, constructed as explained above.
    
    Throws:
    
    java.lang.Exception
  - getFileNameField
```
public java.lang.String getFileNameField()
```
    Get the field name for the fileName field configured for this DataSource for fileSource operations.
    This allows fileSource operations to always use "fileName" as a field name, no matter where this DataSource stores the fileName.
    The default implementation works as follows:
    - If the DataSource configuration specifies a "fileNameField", then that is used.
    - Otherwise, if there is a field named "fileName", "name", or "title", then that field is used.
    - Otherwise, if there is a single primary key, and it has the type "text", then that field is used.
    - Otherwise, an error is logged
    Returns:
    
    The name of the fileNameField
  - getFileContentsField
```
public java.lang.String getFileContentsField()
```
    Get the field name for the fileContents field configured for this DataSource for fileSource operations. This allows fileSource operations to always use "fileContents" as a field name, no matter where this DataSource stores the fileContents. The default implementation first checks for fileContentsField in the DataSource configuration. If not found, it checks for a field named fileContents or contents. If not found, it will use the longest text field which is not the fileNameField, fileTypeField, or fileFormatField.
    
    Returns:
    
    The name of the fileContentsField
  - getFileTypeField
```
public java.lang.String getFileTypeField()
```
    Get the field name for the fileType field configured for this DataSource for fileSource operations. This allows fileSource operations to always use "fileType" as a field name, no matter where this DataSource stores the fileType. The default implementation will first look for a fileTypeField specified in the DataSource configuration. If not found, it will look for a field named "fileType". Otherwise, it is assumed that this DataSource does not distinguish between multiple fileTypes, so any supplied fileType is ignored by fileSource operations.
    
    Returns:
    
    The name of the fileTypeField
  - getFileFormatField
```
public java.lang.String getFileFormatField()
```
    Get the field name for the fileFormat field configured for this DataSource for fileSource operations. This allows fileSource operations to always use "fileFormat" as a field name, no matter where this DataSource stores the fileFormat. The default implementation will first look for a fileFormatField specified in the DataSource configuration. If not found, it will look for a field named "fileFormat". Otherwise, it is assumed that this DataSource does not distinguish between multiple fileFormats, so any supplied fileFormat is ignored by fileSource operations.
    
    Returns:
    
    The name of the fileFormatField
  - getFile
```
public java.io.Reader getFile(DSFileSpec fileSpec)
                       throws java.lang.Exception
```
    Gets the contents of a file stored in this DataSource.
    
    Parameters:
    
    fileSpec - A specifier for the file.
    
    Returns:
    
    A Reader for the contents of the file. Null if the file is not found.
    
    Throws:
    
    java.lang.Exception
  - getFileAsString
```
public java.lang.String getFileAsString(DSFileSpec fileSpec)
                                 throws java.lang.Exception
```
    Gets the contents of a file stored in this DataSource
    
    Parameters:
    
    fileSpec - A specifier for the file.
    
    Returns:
    
    The contents of the file. Null if the file is not found.
    
    Throws:
    
    java.lang.Exception
  - getFileAsInputStream
```
public java.io.InputStream getFileAsInputStream(DSFileSpec fileSpec)
                                         throws java.lang.Exception
```
    Gets the contents of a file stored in this DataSource
    
    Parameters:
    
    fileSpec - A specifier for the file.
    
    Returns:
    
    The contents of the file. Null if the file is not found.
    
    Throws:
    
    java.lang.Exception
  - hasFile
```
public boolean hasFile(DSFileSpec fileSpec)
                throws java.lang.Exception
```
    Indicates whether a file exists in this DataSource.
    
    Parameters:
    
    fileSpec - A specifier for the file.
    
    Returns:
    
    Whether the file can be found.
    
    Throws:
    
    java.lang.Exception
  - saveFile
```
public java.util.Map saveFile(DSFileSpec fileSpec,
                              java.lang.Object contents)
                       throws java.lang.Exception
```
    Save a file to the DataSource.
    
    Parameters:
    
    fileSpec - A specifier for the file. A fileName is always required. Some DataSources will require that the fileType and fileFormat be specified.
    
    contents - The contents of the file.
    
    Returns:
    
    A map with the saved record, but without the fileContents
    
    Throws:
    
    java.lang.Exception
  - listFiles
```
public java.util.List listFiles(java.lang.Object criteria,
                                DSRequest context)
                         throws java.lang.Exception
```
    Get a list of files from the DataSource.
    
    Parameters:
    
    criteria - Criteria to apply. References to fileName, fileContents and fileType will be translated to the native field names configured for this DataSource.
    
    context - DSRequest which provides the security context in which this method should run.
    
    Returns:
    
    The FileList. The Maps will have the fileName, fileType and fileFormat fields populated, but not the fileContents field. (You can use getFile() to get the fileContents).
    
    Throws:
    
    java.lang.Exception
  - listFiles
```
public java.util.List listFiles(java.lang.Object criteria)
                         throws java.lang.Exception
```
    Get a list of files from the DataSource.
    
    Parameters:
    
    criteria - Criteria to apply. References to fileName, fileContents and fileType will be translated to the native field names configured for this DataSource.
    
    Returns:
    
    The FileList. The Maps will have the fileName, fileType and fileFormat fields populated, but not the fileContents field. (You can use getFile() to get the fileContents).
    
    Throws:
    
    java.lang.Exception
  - listFiles
```
public java.util.List listFiles(java.lang.String type,
                                java.lang.String format,
                                DSRequest context)
                         throws java.lang.Exception
```
    Get a list of files from the DataSource.
    
    Parameters:
    
    type - The file type (e.g. "ds")
    
    format - The file format (e.g. "xml" or "js")
    
    context - DSRequest which provides the security context in which this method should run.
    
    Returns:
    
    The FileList. The Maps will have the fileName, fileType and fileFormat fields populated, but not the fileContents field. (You can use getFile() to get the fileContents).
    
    Throws:
    
    java.lang.Exception
  - listFiles
```
public java.util.List listFiles(java.lang.String type,
                                java.lang.String format)
                         throws java.lang.Exception
```
    Get a list of files from the DataSource.
    
    Parameters:
    
    type - The file type (e.g. "ds")
    
    format - The file format (e.g. "xml" or "js")
    
    Returns:
    
    The FileList. The Maps will have the fileName, fileType and fileFormat fields populated, but not the fileContents field. (You can use getFile() to get the fileContents).
    
    Throws:
    
    java.lang.Exception
  - renameFile
```
public java.util.List renameFile(DSFileSpec oldSpec,
                                 DSFileSpec newSpec)
                          throws java.lang.Exception
```
    Rename a file stored in this DataSource.
    
    Parameters:
    
    oldSpec - The original fileSpec.
    
    newSpec - The new fileSpec.
    
    Returns:
    
    Records represening the renamed file(s). The records will have their fileName, fileType, and fileFormat fields populated, but not the fileContents field.
    
    Throws:
    
    java.lang.Exception
  - removeFile
```
public java.util.List removeFile(DSFileSpec fileSpec)
                          throws java.lang.Exception
```
    Remove a file stored in this DataSource.
    
    Parameters:
    
    fileSpec - A specifier for the file.
    
    Returns:
    
    Records represening the removed file(s). The records will have their fileName, fileType and fileFormat fields populated, but not the fileContents field.
    
    Throws:
    
    java.lang.Exception
  - fetch
```
public java.util.List fetch(java.lang.Object criteria)
                     throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "fetch", calling setCriteria() on it, and then calling its execute() method.
    
    Parameters:
    
    criteria - The criteria to use for the fetch operation
    
    Returns:
    
    List with retrieved data.
    
    Throws:
    
    java.lang.Exception
  - fetch
```
public java.util.List fetch(java.lang.String key,
                            java.lang.Object value)
                     throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "fetch", calling setCriteria() on it, and then calling its execute() method. The criteria object is formed by building a single-key map from the key and value passed in.
    
    Parameters:
    
    key - The criterion key
    
    value - The criterion value
    
    Returns:
    
    List with retrieved data.
    
    Throws:
    
    java.lang.Exception
  - filter
```
public java.util.List filter(java.lang.Object criteria)
                      throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "filter", calling setCriteria() on it, and then calling its execute() method.
    
    Parameters:
    
    criteria - The criteria to use for the filter operation
    
    Returns:
    
    List with retrieved data.
    
    Throws:
    
    java.lang.Exception
  - filter
```
public java.util.List filter(java.lang.String key,
                             java.lang.Object value)
                      throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "filter", calling setCriteria() on it, and then calling its execute() method. The criteria object is formed by building a single-key map from the key and value passed in.
    
    Parameters:
    
    key - The criterion key
    
    value - The criterion value
    
    Returns:
    
    List with retrieved data.
    
    Throws:
    
    java.lang.Exception
  - add
```
public long add(java.lang.Object values)
         throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "add", calling setValues() on it, and then calling its execute() method.
    
    Parameters:
    
    values - The values to use for the add operation
    
    Returns:
    
    long number of affected rows.
    
    Throws:
    
    java.lang.Exception
  - add
```
public long add(java.lang.Object values,
                RPCManager rpc)
         throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "add", calling setValues() and setRPCManager() on it, and then calling its execute() method.
    
    Parameters:
    
    values - The values to use for the add operation
    
    Returns:
    
    long number of affected rows.
    
    Throws:
    
    java.lang.Exception
  - update
```
public long update(java.lang.Object criteria,
                   java.lang.Object values)
            throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "update", calling setValues() and setCriteria() on it, and then calling its execute() method.
    
    Parameters:
    
    criteria - The criteria to use for the update operation
    
    values - The values to use for the update operation
    
    Returns:
    
    long number of affected rows.
    
    Throws:
    
    java.lang.Exception
  - update
```
public long update(java.lang.Object criteria,
                   java.lang.Object values,
                   RPCManager rpc)
            throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "update", calling setValues(), setCriteria() and setRPCManager() on it, and then calling its execute() method.
    
    Parameters:
    
    criteria - The criteria to use for the update operation
    
    values - The values to use for the update operation
    
    rpc - The RPCManager to use for the update operation
    
    Returns:
    
    long number of affected rows.
    
    Throws:
    
    java.lang.Exception
  - remove
```
public long remove(java.lang.Object criteria)
            throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "remove", calling setCriteria() on it, and then calling its execute() method.
    
    Parameters:
    
    criteria - The criteria to use for the remove operation
    
    Returns:
    
    long number of affected rows.
    
    Throws:
    
    java.lang.Exception
  - fetchSingle
```
public java.util.Map fetchSingle(java.lang.String key,
                                 java.lang.Object value)
                          throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "fetch", calling setCriteria() on it, calling its execute() method, then obtaining just the first item of the results. The criteria object is formed by building a single-key map from the key and value passed in.
    Note that this method expects the specified criterion to result in a single result, and will throw an exception if the multiple records match the request.
    
    Parameters:
    
    key - The criterion key
    
    value - The criterion value
    
    Returns:
    
    Map of retrieved object properties.
    
    Throws:
    
    java.lang.Exception
  - fetchSingle
```
public java.util.Map fetchSingle(java.lang.Object criteria)
                          throws java.lang.Exception
```
    This convenience method is the equivalent of creating a DSRequest with an operationType of "fetch", calling setCriteria() on it, calling its execute() method, then obtaining just the first item of the results.
    Note that this method expects the specified criteria to result in a single result, and will throw an exception if the multiple records match the request.
    
    Parameters:
    
    criteria - The criteria to use for the fetch operation
    
    Returns:
    
    Map of retrieved object properties.
    
    Throws:
    
    java.lang.Exception
  - getTransactionObject
```
public java.lang.Object getTransactionObject(DSRequest req)
                                      throws java.lang.Exception
```
    Returns an object that can be used to manage transactions for this DataSource and other DataSources of the same type and provider. The object returned is of a type specific to the type of DataSource
    This method is part of the Automatic Transactions feature, which is effective only in Power edition and above.
    
    Throws:
    
    java.lang.Exception
  - getTransactionObject
```
public static java.lang.Object getTransactionObject(DSRequest req,
                                                    java.lang.String transactionObjectKey,
                                                    java.lang.String shortTransactionObjectKey)
                                             throws java.lang.Exception
```
    Helper method retrieves connection/transaction object for specified type of data source implementation or null.
    - for SQLDataSource: Connection conn = DataSource.getTransactionObject(req, SQLTransaction.CONNECTION_ATTR + dbName); where dbName is name of database as configured in server.properties file. Returned conn is instance of java.sql.Connection to specified data base.
    - for HibernateDataSource:Transaction tx = DataSource.getTransactionObject(req, HibernateTransaction.TRANSACTION_ATTR); Session session = HibernateTransaction.getTransactionSession(tx); session and tx instances of hibernate session and transaction object used by HibernateDataSource.
    - for JPADataSource: JPAConnectionHolder holder = DataSource.getTransactionObject(req, EMF.TRANSACTION_ATTR); JPAConnectionHolder instance contains references to entity manager and transaction object used by JPADataSource instances.
    Transaction is started by first execution of corresponding data source implementation. Following operations should retrieve transaction object and use it but should never commit/rollback. Overall commit/rollback will be issued by RPCManager and will be handled by data source object which started transaction.
    This method is part of the Automatic Transactions feature, which is effective only in Power edition and above.
    Parameters:
    
    req - DSRequest
    
    transactionObjectKey - String Name of transaction object key.
    
    Returns:
    
    Object containing connection/transaction. Actual type of instance depends on passed parameter transactionObjectKey. null is returned if specified request does not contain reference to RPCManager or specified object is not set.
    
    Throws:
    
    java.lang.Exception - if provided DSRequest is null.
  - hasRecord
```
public boolean hasRecord(java.lang.String columnName,
                         java.lang.Object value)
                  throws java.lang.Exception
```
    Returns true if the dataSource contains at least one record where the columnName matches the value.
    
    Parameters:
    
    columnName - The columnName to use in the search criteria
    
    value - The value to look for in the search criteria
    
    Throws:
    
    java.lang.Exception
  - hasRecord
```
public boolean hasRecord(java.util.Map criteria)
                  throws java.lang.Exception
```
    Returns true if the dataSource contains at least one record that matches the supplied criteria
    
    Parameters:
    
    criteria - A Map containing the search criteria
    
    Throws:
    
    java.lang.Exception
  - fetchById
```
public java.util.Map fetchById(java.lang.Object id)
                        throws java.lang.Exception
```
    Same as DataSource.fetchById(Object, RPCManager), without the optional RPCManager parameter
    
    Parameters:
    
    id - The primary key value to match, or a set of primary key values in a Map
    
    Throws:
    
    java.lang.Exception
  - fetchById
```
public java.util.Map fetchById(java.lang.Object id,
                               RPCManager rpc)
                        throws java.lang.Exception
```
    Returns the record whose primary key matches the supplied id, or null if no such record exists. For a DataSource with a composite primary key, this method's behavior is dependent on the type of the "id" parameter:
    - If "id" is a Map, it is assumed to be criteria expressing the full primary key, and is passed directly to the underlying operation. If the full set of primary key values is correctly provided in the Map, this will return the single record whose composite primary key matches that set of values
    - If "id" is not a Map, it is assumed to be a single value to match against the DataSource's first primary key field. In this case, it returns the first record (if any) where the first defined primary key field matches the supplied id
    Parameters:
    
    id - The primary key value to match, or a set of primary key values in a Map
    
    rpc - An optional RPCManager to apply to the DSRequest we generate to implement the fetch. If provided, this gives access to the RPCManager's shared state. For example, it may allow the fetch to share a database transaction or give it access to an HttpSession
    
    Throws:
    
    java.lang.Exception
  - getEnumTranslateStrategy
```
public java.lang.String getEnumTranslateStrategy()
```
    Returns the strategy this DataSource uses for translating Java enumerated types (enums). See DataSource.setEnumTranslateStrategy(String) for details of valid translate strategies
    
    Returns:
    
    A String containing the enum translate strategy
  - setEnumTranslateStrategy
```
public void setEnumTranslateStrategy(java.lang.String newValue)
```
    Sets the strategy this DataSource uses to translate enumerated types (objects of type enum). Valid values are:
    "name" Translates to/from a String matching the constant name
    "string" Translates to/from a String matching the enum.toString()
    "ordinal" Translates to/from an integer matching the ordinal number of the constant within the enumeration
    "bean" Translates to/from a JS object containing one property for each property defined within the enum. The constant itself and the ordinal number are included in the JS object. By default they are called "_constant" and "_ordinal", but this can be overridden on both JSTranslater and DataSource with the enumOrdinalProperty and enumConstantProperty properties (which have setters named using normal bean semantics)
    
    Parameters:
    
    newValue - A String containing the new enum translate strategy
  - getEnumOrdinalProperty
```
public java.lang.String getEnumOrdinalProperty()
```
    Returns the name of the property this DataSource uses for ordinal number when translating enumerated types. Defaults to "_ordinal"
    
    Returns:
    
    The ordinal property name
  - getEnumConstantProperty
```
public java.lang.String getEnumConstantProperty()
```
    Returns the name of the property this DataSource uses for constant name when translating enumerated types. Defaults to "_constant"
    
    Returns:
    
    The constant value property name
  - setEnumOrdinalProperty
```
public void setEnumOrdinalProperty(java.lang.String newValue)
```
    Sets the name of the property this DataSource should use for ordinal number when translating enumerated types.
    
    Parameters:
    
    newValue - The new ordinal property name
  - setEnumConstantProperty
```
public void setEnumConstantProperty(java.lang.String newValue)
```
    Sets the name of the property this DataSource should use for constant name when translating enumerated types.
    
    Parameters:
    
    newValue - The new constant value property name
  - getPropertyJavaClass
```
public java.lang.Class getPropertyJavaClass(java.lang.String propertyName,
                                            DSField field,
                                            java.lang.Object value)
                                     throws java.lang.Exception
```
    Override point to allow subclasses to dynamically determine the Java class to use for a given property. The default implementation returns the Class indicated by the passed-in DSField's "javaClass" property. Scan the client-side documentation for "javaClass" for details.
    Your overriding method is passed the name of the property we are trying to populate, the raw value we are going to use to populate it, and the DSField object associated with the property. It is envisaged that this will be sufficient context to dynamically decide on a Class to use. For example, if the raw Map passed in contains a given property, your code might decide to use Class B rather than the normal Class A.
    Note that whatever class you return from this method will be used as the parameter type for the corresponding setter on the bean we are populating. This means that this method (and indeed the declarative "javaClass" property) is only useful if your Javabean property type is a supertype of whatever class you return from this method. Examples of valid use cases would include things like your Javabean property is of an interface or abstract type, or of a general base type like Object.
    
    Parameters:
    
    propertyName - Name of the property we are trying to populate, for context
    
    field - The associated DSField
    
    value - The raw value we are trying to assign to this property. Note this will ordinarily be a Map or a List of Maps
    
    Returns:
    
    The Class to use for this property; return the result of calling super() to fall back to default behavior, or null to bypass custom bean Class derivation for this property (we will use Reflection to determine the type to use, as described in the client-side documentation for DataSourceField.javaClass)
    
    Throws:
    
    java.lang.Exception
  - convertRelativeDates
```
public static AdvancedCriteria convertRelativeDates(AdvancedCriteria advancedCriteria)
```
    Converts all relative dates in a critierion to absolute dates relative to the time when this method is called. Unlike DataSource.convertRelativeDates(com.isomorphic.criteria.AdvancedCriteria, java.util.Date) this method will assume that the relative point in time to convert against is now.
    
    Parameters:
    
    advancedCriteria - the AdvancedCriteria for which to convert relative dates.
    
    Returns:
    
    an AdvancedCriteria with converted relative dates.
    
    See Also:
    
    DataSource.convertRelativeDates(com.isomorphic.criteria.Criterion)
  - convertRelativeDates
```
public static AdvancedCriteria convertRelativeDates(AdvancedCriteria advancedCriteria,
                                                    java.util.Date baseDate)
```
    Converts all relative dates in a critierion to absolute dates relative to the time when this method is called.
    
    Parameters:
    
    advancedCriteria - the AdvancedCriteria for which to convert relative dates.
    
    baseDate - the relative point in time to convert dates against.
    
    Returns:
    
    the AdvancedCriteria with it's relative dates converted.
    
    See Also:
    
    DataSource.convertRelativeDates(com.isomorphic.criteria.Criterion, java.util.Date, DataSource)
  - convertRelativeDates
```
public static Criterion convertRelativeDates(Criterion criterion)
```
    Converts all relative dates in a critierion to absolute dates relative to the time when this method is called.
    
    Important Notes
    Normally there is no need to convert relative dates on the server, this is done by default on the client before the request is sent to the server. The primary purpose for converting relative dates on the server is when there is a need to store and use relative dates at a later point such as in an automated job without any involvement from the client.
    In order for the client to automatically send relative dates to the server you need to set DataSource.autoConvertRelativeDates to false.
    If you want to store a client side criteria containing relative dates for later parsing server side you need to use the LOGICAL_DATE_CONSTRUCTOR mode of JSONEncoder when encoding the criteria on the client and then use AdvancedCriteria.decodeClientCriteria(String) to decode the criteria on the server.
    
    Examples
    Suppose you have a DataSource with ID "overnightReports" with a field "storedCriteria" where you want to store a criteria created by the end user which will run overnight on the server.
    In such case you would have to serialize the critiera on the client before sending it to the server.
    JavaScript
```
 var encodedCriteria = isc.JSON.encode(criteria, {dateFormat: 'logicalDateConstructor'});

 // Add the encoded criteria to your datasource.
 overnightReports.addData({
     storedCriteria: encodedCriteria
 });
 
```
    SmartGWT
```
 final JSONEncoder jsonEncoder = new JSONEncoder();
 jsonEncoder.setDateFormat(JSONDateFormat.LOGICAL_DATE_CONSTRUCTOR);

 // Encode the criteria using the above JSONEncoder.
 final String encodedCriteria = JSON.encode(criteria, jsonEncoder);

 // Add the encoded criteria to your datasource.
 final Record newRecord = new Record();
 newRecord.setAttribute("storedCriteria", encodedCriteria);

 overnightReports.addData(newRecord);
 
```
    Parameters:
    
    criterion - the criterion to convert relative dates for.
    
    Returns:
    
    the criterion after conversion.
  - convertRelativeDates
```
public static Criterion convertRelativeDates(Criterion criterion,
                                             java.util.Date baseDate,
                                             DataSource ds)
```
    Converts all relative dates in a critierion to absolute dates relative to the time provided as base date.
    
    Parameters:
    
    criterion - the criterion to convert relative dates for.
    
    baseDate - the relative point in time to convert dates against.
    
    ds - the DataSource applicable to this criterion. Pass null if you do not have access to the dataSource, but be aware that this may lead to inaccurate handling of date values (because we are unable to distinguish between "date" and "datetime" fields, we treat all values as datetimes)
    
    Returns:
    
    the criterion after conversion.
  - convertRelativeDates
```
public static Criterion convertRelativeDates(Criterion criterion,
                                             java.util.Date baseDate,
                                             DataSource ds,
                                             boolean useEmbeddedTZ)
```
    Converts all relative dates in a critierion to absolute dates relative to the time provided as base date.
    This API can potentially use the client's timezone to determine what is meant by concepts such as "the start of today" or "the end of tomorrow", if the client supplies its timezone in the relativeDate definition (this happens in SmartClient versions from 11.1 onwards, Smart GWT versions 6.1 onwards). However, please note that the client actually sends up its current offest from UTC, not a real timezone identifier; this is unavoidable, as it is not possible to reliably detect the actual timezone identifier from Javascript.
    The offset from GMT/UTC is usually adequate to correctly convert datetimes, but without real timezone information we get subtle errors in cases where a date range straddles the changeover to or from daylight savings time (DST); because we don't really know the timezone, we don't know how DST applies to it.
    For example, consider a user in the US Pacific timezone who specifies a date range of "$yesterday" to "$tomorrow" at local midday on 13 March 2016. On that date, the US Pacific timezone switches from "Pacific Standard Time" to "Pacific Daylight Time" at 1am. Therefore PDT, which is UTC-07:00, is in force, and this is what is sent to the server. However, "$yesterday" should correctly be resolved as local midday on the previous day, March 12. On March 12, the US Pacific timezone was on PST, so the correct UTC start time is 2016-03-12 20:00:00 UTC. But the server doesn't know about the DST changeover because it doesn't know that the client is in US Pacific; it only knows that the offset from UTC is -07:00. Therefore, the start time will be incorrectly calculated as 2016-03-12 19:00:00 UTC.
    
    Parameters:
    
    criterion - the criterion to convert relative dates for.
    
    baseDate - the relative point in time to convert dates against.
    
    ds - the DataSource applicable to this criterion. Pass null if you do not have access to the dataSource, but be aware that this may lead to inaccurate handling of date values (because we are unable to distinguish between "date" and "datetime" fields, we treat all values as datetimes)
    
    useEmbeddedTZ - If true, uses the timezone offset embedded in a relativeDate definition, if one is present. If this parameter is false, or there is no embedded timezone, the server timezone is used. Note, no embedded timezone information is sent from the client in versions earlier than 11.1 / 6.1 (SmartClient / Smart GWT)
    
    Returns:
    
    the criterion after conversion.
  - getRelatedDisplayRecord
```
@Deprecated
public java.util.Map getRelatedDisplayRecord(java.lang.String fieldName,
                                                         java.lang.Object displayValue)
                                                  throws java.lang.Exception
```
    Deprecated.
    
    This method is still supported for calling, but the new API DataSource.getRelatedDisplayRecord(String, Object, DSRequest) is the one that you must override if you want to customize the behavior.
    
    Throws:
    
    java.lang.Exception
    
    See Also:
    
    DataSource.getRelatedDisplayRecord(String, Object, DSRequest)
  - getRelatedDisplayRecord
```
public java.util.Map getRelatedDisplayRecord(java.lang.String fieldName,
                                             java.lang.Object displayValue,
                                             DSRequest dsRequest)
                                      throws java.lang.Exception
```
    Returns the "related display record" for a given field. This only applies to fields that:
    - Declare a foreignKey
    - Declare a displayField
    - The displayField so declared is an includeFrom field on the same DataSource that the foreignKey declaration targets
    Given a field like this, the related display record is the record in the foreign DataSource (the one that is the target of the foreignKey definition) where the field that is the target of the includeFrom definition matches the displayValue parameter passed to this method. For example, consider a dataSource "Widgets" with these fields:
```
    
      
 
```
    Now assume that the Colors dataSource contains these records:
```
    {id: 1, name:"Cyan"}
    {id: 2, name:"Magenta"}
    {id: 3, name:"Yellow"}
 
```
    Now, calling getRelatedDisplayRecord("color", "Yellow") on an instance of the "Widgets" dataSource will return
```
    {id: 3, name:"Yellow"}
 
```
    The framework uses this method during data import, to map display values provided in import datasets like CSV files, to their proper corresponding key values
    Parameters:
    
    fieldName - The name of the field to obtain the related display record for
    
    displayValue - The display value to use for looking up the related display record
    
    Returns:
    
    The related display record, or null if the concept of a related display record is not applicable to the supplied field, or no related display record is found
    
    Throws:
    
    java.lang.Exception
  - transformImportValue
```
@Deprecated
public java.lang.Object transformImportValue(java.lang.String fieldName,
                                                         java.lang.Object rawValue,
                                                         java.lang.String defaultStrategy)
                                                  throws java.lang.Exception
```
    Deprecated.
    
    This is still supported for calling, but the new API DataSource.transformImportValue(String, Object, String, DSRequest) is the one that you must override if you want to customize the behavior.
    
    Throws:
    
    java.lang.Exception
    
    See Also:
    
    DataSource.transformImportValue(String, Object, String, DSRequest)
  - transformImportValue
```
public java.lang.Object transformImportValue(java.lang.String fieldName,
                                             java.lang.Object rawValue,
                                             java.lang.String defaultStrategy,
                                             DSRequest dsRequest)
                                      throws java.lang.Exception
```
    Transforms the passed-in rawValue and returns the result of the transformation. This method is called during data import, immediately before values are translated to an appropriate data type and validated. The base implementation transforms display values in the import dataset to their underlying key values, for fields that have a "related display record". See DataSource.getRelatedDisplayRecord(String, Object) for more details.
    You can add any transformations you require by overriding this method, but if you require the built-in displayValue-to-key transformation described above, be sure to invoke the super-method.
    Transformed values are cached during import process in a DataImport instance. All builtin tools use new DataImport instance, so this makes no effect on import results, except optimizing performance. But, if you end up using DataImport directly and want to use it for multiple imports, keep in mind that transformed values are cached and may affect the results.
    
    Parameters:
    
    fieldName - The name of the field for which are performing a transformation
    
    rawValue - The value to transform
    
    defaultStrategy - The importStrategy ("display" or "key") to use if this field declares an importStrategy of "auto", or does not declare an importStrategy. See the client-side FieldImportStrategy docs for details
    
    Returns:
    
    The key of the related display record, or null if the concept of a related display record is not applicable to the supplied field, or if no related display record is found: untransformed original rawValue for "display" importStrategy or null for "displayRequired" importStrategy.
    
    Throws:
    
    java.lang.Exception
  - isServerOnly
```
public boolean isServerOnly()
```
    Returns true if this datasource has been declared with an attribute of "serverOnly=true". Otherwise false.
    
    Returns:
    
    true if this is a server-side only DataSource.

Class DataSource

Field Summary

Method Summary

Methods inherited from interface com.isomorphic.js.IToJSON

Field Detail

OP_VIEW_FILE

OP_DOWNLOAD_FILE

OP_LOAD_SCHEMA

OP_FETCH

OP_ADD

OP_REMOVE

OP_UPDATE

OP_CUSTOM

OP_VALIDATE

OP_CLIENT_EXPORT

OP_GET_FILE

OP_HAS_FILE

OP_LIST_FILES

OP_SAVE_FILE

OP_RENAME_FILE

OP_REMOVE_FILE

OP_LIST_FILE_VERSIONS

OP_GET_FILE_VERSION

OP_HAS_FILE_VERSION

OP_REMOVE_FILE_VERSION

OP_UNIQUE_NAME

Method Detail

setOmitNullMapValuesInResponse

addDynamicDSGenerator

removeDynamicDSGenerator

addDynamicDSGenerator

addDynamicDSGenerator

getDefaultDynamicDSGenerator

getDynamicDSGenerators

removeDynamicDSGenerator

removeDynamicDSGenerator

clearDynamicDSGenerators

initialized

fromXML

fromXML

fromXML

fromXML

fromXML

fromXML

fromXML

fromXML

getID

getName

getTableName

getFieldNames

getPrimaryKey

getField

getRecordXPath

isModificationOperation

transformMultipleFields

transformMultipleFields

execute

getAuditTypeFieldName

getAuditRevisionFieldName

getAuditTimestampFieldName

getAuditUserFieldName

getAuditChangedFieldsFieldName

setProperties

getListProperties

getListProperties

getProperties

getProperties

getProperties

validate

validate

validate

validateRecord

executeFetch

executeRemove

executeAdd

executeUpdate

executeCustom

executeClientExport

executeFileSource

getFileNameField