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

java.lang.Object
  org.apache.openjpa.jdbc.meta.strats.AbstractStrategy
      org.apache.openjpa.jdbc.meta.strats.AbstractFieldStrategy
          org.apache.openjpa.jdbc.meta.strats.ContainerFieldStrategy
              org.apache.openjpa.jdbc.meta.strats.StoreCollectionFieldStrategy
                  org.apache.openjpa.jdbc.meta.strats.RelationToManyTableFieldStrategy
                      org.apache.openjpa.jdbc.meta.strats.RelationCollectionTableFieldStrategy

All Implemented Interfaces:

Serializable, FieldStrategy, Strategy, LRSCollectionFieldStrategy

public class RelationCollectionTableFieldStrategy
extends RelationToManyTableFieldStrategy
implements LRSCollectionFieldStrategy

Maps a collection of related objects through an association table.

Author:

Abe White

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractFieldStrategy

field

Constructor Summary

RelationCollectionTableFieldStrategy()

Method Summary

Column[]	getElementColumns(ClassMapping elem) Return the columns holding the data for a collection element for the given element mapping from LRSCollectionFieldStrategy.getIndependentElementMappings(boolean) (or null).
FieldMapping	getFieldMapping() The owning field mapping.
ClassMapping[]	getIndependentElementMappings(boolean traverse) Return all independent mappings to which this strategy must join in order to access collection elements, or empty array if none.
ForeignKey	getJoinForeignKey(ClassMapping elem) Return the foreign key used to join to the owning field for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).
Joins	join(Joins joins, ClassMapping elem) Join to the owning field table for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).
Joins	joinElementRelation(Joins joins, ClassMapping elem) Join this value's table to the table for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).
Object	loadElement(OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, Result res, Joins joins) Load an element of the collection.
void	map(boolean adapt) Map the owning mapping using this strategy.
protected Proxy	newLRSProxy() Return a large result set proxy for this field.
void	selectElement(Select sel, ClassMapping elem, JDBCStore store, JDBCFetchConfiguration fetch, int eagerMode, Joins joins) Implement this method to select the elements of this field for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.RelationToManyTableFieldStrategy

delete, insert, join, joinRelation, toDataStoreValue, update

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.StoreCollectionFieldStrategy

add, getJoinForeignKey, isEagerSelectToMany, load, loadEagerJoin, loadEagerParallel, loadProjection, selectAll, selectEagerJoin, selectEagerParallel, supportsSelect, toCollection

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.ContainerFieldStrategy

appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendJoinCount, appendSize, appendUnaliasedJoin

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractFieldStrategy

assertNotMappedBy, isVersionable, joinKey, joinKeyRelation, load, loadKeyProjection, select, setFieldMapping, toKeyDataStoreValue, where

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractStrategy

customDelete, customInsert, customUpdate, getAlias, initialize, isCustomDelete, isCustomInsert, isCustomUpdate

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.jdbc.meta.FieldStrategy

appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, isEagerSelectToMany, isVersionable, join, joinKey, joinKeyRelation, joinRelation, load, load, loadEagerJoin, loadEagerParallel, loadKeyProjection, loadProjection, select, selectEagerJoin, selectEagerParallel, setFieldMapping, supportsSelect, toDataStoreValue, toKeyDataStoreValue, where

Methods inherited from interface org.apache.openjpa.jdbc.meta.Strategy

customDelete, customInsert, customUpdate, delete, getAlias, initialize, insert, isCustomDelete, isCustomInsert, isCustomUpdate, update

Constructor Detail

RelationCollectionTableFieldStrategy

public RelationCollectionTableFieldStrategy()

Method Detail

getFieldMapping

public FieldMapping getFieldMapping()

Description copied from interface: LRSCollectionFieldStrategy

The owning field mapping.

Specified by:

getFieldMapping in interface LRSCollectionFieldStrategy

getIndependentElementMappings

public ClassMapping[] getIndependentElementMappings(boolean traverse)

Description copied from class: ContainerFieldStrategy

Return all independent mappings to which this strategy must join in order to access collection elements, or empty array if none.

Specified by:

getIndependentElementMappings in interface LRSCollectionFieldStrategy

Overrides:

getIndependentElementMappings in class RelationToManyTableFieldStrategy

Parameters:

traverse - whether we're traversing through to the related type

See Also:

ValueMapping.getIndependentTypeMappings(), ClassMapping.EMPTY_MAPPINGS

getElementColumns

public Column[] getElementColumns(ClassMapping elem)

Description copied from interface: LRSCollectionFieldStrategy

Return the columns holding the data for a collection element for the given element mapping from LRSCollectionFieldStrategy.getIndependentElementMappings(boolean) (or null).

Specified by:

getElementColumns in interface LRSCollectionFieldStrategy

getJoinForeignKey

public ForeignKey getJoinForeignKey(ClassMapping elem)

Description copied from class: StoreCollectionFieldStrategy

Return the foreign key used to join to the owning field for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).

Specified by:

getJoinForeignKey in interface LRSCollectionFieldStrategy

Overrides:

getJoinForeignKey in class RelationToManyTableFieldStrategy

selectElement

public void selectElement(Select sel,
                          ClassMapping elem,
                          JDBCStore store,
                          JDBCFetchConfiguration fetch,
                          int eagerMode,
                          Joins joins)

Description copied from class: StoreCollectionFieldStrategy

Implement this method to select the elements of this field for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null). Elements of the result will be loaded with StoreCollectionFieldStrategy.loadElement(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore, org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration, org.apache.openjpa.jdbc.sql.Result, org.apache.openjpa.jdbc.sql.Joins).

Specified by:

selectElement in interface LRSCollectionFieldStrategy

Overrides:

selectElement in class RelationToManyTableFieldStrategy

loadElement

public Object loadElement(OpenJPAStateManager sm,
                          JDBCStore store,
                          JDBCFetchConfiguration fetch,
                          Result res,
                          Joins joins)
                   throws SQLException

Description copied from class: StoreCollectionFieldStrategy

Load an element of the collection. The given state manager might be null if the load is for a projection or for processing eager parallel results.

Specified by:

loadElement in interface LRSCollectionFieldStrategy

Overrides:

loadElement in class RelationToManyTableFieldStrategy

Throws:

SQLException

join

public Joins join(Joins joins,
                  ClassMapping elem)

Description copied from class: StoreCollectionFieldStrategy

Join to the owning field table for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).

Overrides:

join in class RelationToManyTableFieldStrategy

joinElementRelation

public Joins joinElementRelation(Joins joins,
                                 ClassMapping elem)

Description copied from class: StoreCollectionFieldStrategy

Join this value's table to the table for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).

Specified by:

joinElementRelation in interface LRSCollectionFieldStrategy

Overrides:

joinElementRelation in class RelationToManyTableFieldStrategy

See Also:

FieldMapping.joinRelation(org.apache.openjpa.jdbc.sql.Joins, boolean, boolean)

newLRSProxy

protected Proxy newLRSProxy()

Description copied from class: StoreCollectionFieldStrategy

Return a large result set proxy for this field.

Specified by:

newLRSProxy in class StoreCollectionFieldStrategy

map

public void map(boolean adapt)

Description copied from interface: Strategy

Map the owning mapping using this strategy.

Specified by:

map in interface Strategy

Overrides:

map in class RelationToManyTableFieldStrategy

Parameters:

adapt - if true, use the owning mapping's raw mapping info to set its ORM data; if false, ORM data will already be set