org.datanucleus.store.mapped.mapping
Class ReferenceIdMapping

java.lang.Object
  org.datanucleus.store.mapped.mapping.JavaTypeMapping
      org.datanucleus.store.mapped.mapping.MultiMapping
          org.datanucleus.store.mapped.mapping.ReferenceMapping
              org.datanucleus.store.mapped.mapping.ReferenceIdMapping

All Implemented Interfaces:

MappingCallbacks

public class ReferenceIdMapping
extends ReferenceMapping

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

Field Summary

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

ID_MAPPING, LOCALISER_MAPPED, mappingStrategy, PER_IMPLEMENTATION_MAPPING, XCALIA_MAPPING

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

javaTypeMappings, numberOfDatastoreMappings

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

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

Constructor Summary

ReferenceIdMapping(ReferenceMapping refMapping)
Constructor used to generate a ReferenceMapping representing only the identity of the object.

Method Summary

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

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

getJavaType, getJavaTypeForDatastoreMapping, getMappingNumberForValue, getMappingStrategy, getObjectForReferenceString, getReferenceStringForObject, 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, getBoolean, getByte, getChar, getColumnMetaDataForMember, getDatastoreContainer, getDouble, getFloat, getInt, getLong, getMemberMetaData, getObject, getReferenceMapping, getRoleForMember, getShort, getString, getType, getValueForDatastoreMapping, hashCode, hasSimpleDatastoreRepresentation, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, initialize, isNullable, isSerialised, 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

ReferenceIdMapping

public ReferenceIdMapping(ReferenceMapping refMapping)

Constructor used to generate a ReferenceMapping 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:

refMapping - The mapping to base it on

Method Detail

getObject

public java.lang.Object getObject(ExecutionContext ec,
                                  java.lang.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 ReferenceMapping

Parameters:

ec - execution context

rs - The ResultSet

param - Array of parameter ids in the ResultSet to retrieve

Returns:

The id of the PC object.

setObject

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

Method to set the object based on an input identity.

Overrides:

setObject in class MultiMapping

Parameters:

ec - execution context

ps - PreparedStatement

param - Parameter positions to populate when setting the value

value - The identity