Field Detail

• inInitState

  protected static final java.util.Map inInitState

  Holds data sources which are in init state.

• 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_FILE_SOURCE

  public static final java.util.Set OP_FILE_SOURCE

  Constant specifying the fileSource operations.

Method Detail

• 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()

• 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

• 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 metods, com.isomorphic.datasource.DataSource.transformMultipleFields(DSRequest) and com.isomorphic.datasource.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.

• 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 com.isomorphic.util.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.

  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

• 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" operationId.

  saveFile

  Return a DSResponse appropriate for an "add" operation, using the fileName, fileType, fileFormat and fileContents provided by the DSRequest. 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.

  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)
                           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. Note that this parameter does not work with AdvancedCriteria yet.

  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

• 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

• 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

  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

  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

• 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.