org.datanucleus.store.mapped.mapping
Class PersistableIdMapping

java.lang.Object
  org.datanucleus.store.mapped.mapping.JavaTypeMapping
      org.datanucleus.store.mapped.mapping.MultiMapping
          org.datanucleus.store.mapped.mapping.PersistableMapping
              org.datanucleus.store.mapped.mapping.PersistableIdMapping

All Implemented Interfaces:

MappingCallbacks

public class PersistableIdMapping
extends PersistableMapping

Maps to identity objects of persistable values. Used only from within JDOQL queries on JDOHelper.getObjectId expressions

Field Summary

Fields inherited from class org.datanucleus.store.mapped.mapping.PersistableMapping

cmd

Fields inherited from class org.datanucleus.store.mapped.mapping.MultiMapping

javaTypeMappings, numberOfDatastoreMappings

Fields inherited from class org.datanucleus.store.mapped.mapping.JavaTypeMapping

absFieldNumber, datastoreContainer, datastoreMappings, LOCALISER, mmd, referenceMapping, roleForMember, storeMgr, type

Constructor Summary

PersistableIdMapping(PersistableMapping pcMapping)
Constructor used to generate a PCMapping representing only the identity of the object.

Method Summary

Object	getObject(ExecutionContext ec, Object rs, int[] param) Returns an identity for a persistable class.
void	setObject(ExecutionContext ec, Object ps, int[] param, Object value) Method to set the object based on an input identity.

Methods inherited from class org.datanucleus.store.mapped.mapping.PersistableMapping

getJavaType, getValueForDatastoreMapping, initialize, insertPostProcessing, postFetch, postInsert, postUpdate, preDelete, prepareDatastoreMapping, setObject

Methods inherited from class org.datanucleus.store.mapped.mapping.MultiMapping

addJavaTypeMapping, getDatastoreMapping, getDatastoreMappings, getJavaTypeMapping, getNumberOfDatastoreMappings

Methods inherited from class org.datanucleus.store.mapped.mapping.JavaTypeMapping

addDatastoreMapping, equals, failureMessage, getAbsoluteFieldNumber, getBoolean, getByte, getChar, getColumnMetaDataForMember, getDatastoreContainer, getDouble, getFloat, getInt, getJavaTypeForDatastoreMapping, getLong, getMemberMetaData, getObject, getReferenceMapping, getRoleForMember, getShort, getStoreManager, getString, getType, hashCode, hasSimpleDatastoreRepresentation, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, initialize, isNullable, isSerialised, representableAsStringLiteralInStatement, setAbsFieldNumber, setBoolean, setByte, setChar, setDatastoreContainer, setDouble, setFloat, setInt, setLong, setMemberMetaData, setReferenceMapping, setRoleForMember, setShort, setString

Methods inherited from class java.lang.Object

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

Constructor Detail

PersistableIdMapping

public PersistableIdMapping(PersistableMapping pcMapping)

Constructor used to generate a PCMapping representing only the identity of the object. This is typically used where the user has selected the id in a JDOQL query as a result field.

Parameters:

pcMapping - The mapping to base it on

Method Detail

getObject

public Object getObject(ExecutionContext ec,
                        Object rs,
                        int[] param)

Returns an identity for a persistable class. Processes a FK field and finds the object that it relates to, then returns the identity.

Overrides:

getObject in class PersistableMapping

Parameters:

ec - The ExecutionContext

rs - The ResultSet

param - Array of parameter ids in the ResultSet to retrieve

Returns:

The identity of the Persistence Capable object

setObject

public void setObject(ExecutionContext ec,
                      Object ps,
                      int[] param,
                      Object value)

Method to set the object based on an input identity.

Overrides:

setObject in class PersistableMapping

Parameters:

ec - ExecutionContext

ps - PreparedStatement

param - Parameter positions to populate when setting the value

value - The identity