org.apache.openjpa.jdbc.meta.strats
Class RelationStrategies

java.lang.Object
  org.apache.openjpa.jdbc.meta.strats.RelationStrategies

public class RelationStrategies
extends Object

Helper methods for relation mappings.

Author:

Abe White

Constructor Summary

RelationStrategies()

Method Summary

static OpenJPAStateManager	getStateManager(Object obj, StoreContext ctx) Return the state manager for the given instance, using a detached state manager if the instnace is not managed.
static boolean	isRelationId(Column[] cols) Affirms if all of the given columns represent a relationship identifier.
static boolean	isRelationId(ForeignKey fk) Affirms if all of the foreign key columns represent a relationship identifier.
static void	mapRelationToUnmappedPC(ValueMapping vm, DBIdentifier name, boolean adapt)
static void	mapRelationToUnmappedPC(ValueMapping vm, String name, boolean adapt) Map a logical foreign key to an unmapped base class relation.
static Object	toDataStoreValue(ValueMapping vm, Object val, JDBCStore store) Return the given object as its foreign key values.
static MetaDataException	uninversable(ValueMapping vm) Return an exception indicating that the relation is invalid because it has is based on an inverse foreign key and has independent subclasses.
static MetaDataException	unjoinable(ValueMapping vm) Return an exception indicating that we cannot join to the given relation.
static MetaDataException	unloadable(ValueMapping vm) Return an exception indicating that the relation cannot be loaded because it has independent subclasses and does not represent a full oid.

Methods inherited from class java.lang.Object

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

Constructor Detail

RelationStrategies

public RelationStrategies()

Method Detail

unjoinable

public static MetaDataException unjoinable(ValueMapping vm)

Return an exception indicating that we cannot join to the given relation.

unloadable

public static MetaDataException unloadable(ValueMapping vm)

Return an exception indicating that the relation cannot be loaded because it has independent subclasses and does not represent a full oid.

uninversable

public static MetaDataException uninversable(ValueMapping vm)

Return an exception indicating that the relation is invalid because it has is based on an inverse foreign key and has independent subclasses.

toDataStoreValue

public static Object toDataStoreValue(ValueMapping vm,
                                      Object val,
                                      JDBCStore store)

Return the given object as its foreign key values.

See Also:

FieldStrategy.toDataStoreValue(java.lang.Object, org.apache.openjpa.jdbc.kernel.JDBCStore)

mapRelationToUnmappedPC

public static void mapRelationToUnmappedPC(ValueMapping vm,
                                           String name,
                                           boolean adapt)

Map a logical foreign key to an unmapped base class relation.

mapRelationToUnmappedPC

public static void mapRelationToUnmappedPC(ValueMapping vm,
                                           DBIdentifier name,
                                           boolean adapt)

getStateManager

public static OpenJPAStateManager getStateManager(Object obj,
                                                  StoreContext ctx)

Return the state manager for the given instance, using a detached state manager if the instnace is not managed.

isRelationId

public static boolean isRelationId(Column[] cols)

Affirms if all of the given columns represent a relationship identifier.

isRelationId

public static boolean isRelationId(ForeignKey fk)

Affirms if all of the foreign key columns represent a relationship identifier.