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

java.lang.Object
  extended by org.apache.openjpa.jdbc.meta.strats.AbstractStrategy
      extended by org.apache.openjpa.jdbc.meta.strats.AbstractFieldStrategy
          extended by org.apache.openjpa.jdbc.meta.strats.ContainerFieldStrategy
              extended by org.apache.openjpa.jdbc.meta.strats.StoreCollectionFieldStrategy
                  extended by org.apache.openjpa.jdbc.meta.strats.RelationToManyTableFieldStrategy
All Implemented Interfaces:
Serializable, FieldStrategy, Strategy
Direct Known Subclasses:
RelationCollectionTableFieldStrategy, RelationMapTableFieldStrategy

public abstract class RelationToManyTableFieldStrategy
extends StoreCollectionFieldStrategy

Maps a set 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
RelationToManyTableFieldStrategy()
           
 
Method Summary
 void delete(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
          Set the where values appropriately to delete the proper instance, and set all relations on non-secondary tables as updates.
protected  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.
protected  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).
 void insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
          Set values for the mapping into the proper rows.
 Joins join(Joins joins, boolean forceOuter)
          Join this value to the class table.
protected  Joins join(Joins joins, ClassMapping elem)
          Join to the owning field table for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).
protected  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).
 Joins joinRelation(Joins joins, boolean forceOuter, boolean traverse)
          Join this value's table to the table for the related first class object type, if any.
protected  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  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).
 Object toDataStoreValue(Object val, JDBCStore store)
          Translate the given external field value to its datastore equivalent.
 void update(OpenJPAStateManager sm, JDBCStore store, RowManager rm)
          Set values for the mapping into the proper rows.
 
Methods inherited from class org.apache.openjpa.jdbc.meta.strats.StoreCollectionFieldStrategy
add, getJoinForeignKey, isEagerSelectToMany, load, loadEagerJoin, loadEagerParallel, loadProjection, newLRSProxy, newUnion, 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.Strategy
customDelete, customInsert, customUpdate, getAlias, initialize, isCustomDelete, isCustomInsert, isCustomUpdate
 

Constructor Detail

RelationToManyTableFieldStrategy

public RelationToManyTableFieldStrategy()
Method Detail

getIndependentElementMappings

protected 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 class ContainerFieldStrategy
Parameters:
traverse - whether we're traversing through to the related type
See Also:
ValueMapping.getIndependentTypeMappings(), ClassMapping.EMPTY_MAPPINGS

getJoinForeignKey

protected 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 class StoreCollectionFieldStrategy

selectElement

protected 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 class StoreCollectionFieldStrategy

loadElement

protected 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 class StoreCollectionFieldStrategy
Throws:
SQLException

join

protected 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).

Specified by:
join in class StoreCollectionFieldStrategy

joinElementRelation

protected 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 class StoreCollectionFieldStrategy
See Also:
FieldMapping.joinRelation(org.apache.openjpa.jdbc.sql.Joins, boolean, boolean)

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 AbstractStrategy
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

insert

public void insert(OpenJPAStateManager sm,
                   JDBCStore store,
                   RowManager rm)
            throws SQLException
Description copied from interface: Strategy
Set values for the mapping into the proper rows. For class mappings, this method will be called only after the corresponding method has been called for all fields of this mapping.

Specified by:
insert in interface Strategy
Overrides:
insert in class AbstractStrategy
Throws:
SQLException

update

public void update(OpenJPAStateManager sm,
                   JDBCStore store,
                   RowManager rm)
            throws SQLException
Description copied from interface: Strategy
Set values for the mapping into the proper rows.

Specified by:
update in interface Strategy
Overrides:
update in class AbstractStrategy
Throws:
SQLException
See Also:
Strategy.insert(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore, org.apache.openjpa.jdbc.sql.RowManager)

delete

public void delete(OpenJPAStateManager sm,
                   JDBCStore store,
                   RowManager rm)
            throws SQLException
Description copied from interface: Strategy
Set the where values appropriately to delete the proper instance, and set all relations on non-secondary tables as updates. This allows foreign key analysis.

Specified by:
delete in interface Strategy
Overrides:
delete in class AbstractStrategy
Throws:
SQLException
See Also:
Strategy.insert(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore, org.apache.openjpa.jdbc.sql.RowManager)

toDataStoreValue

public Object toDataStoreValue(Object val,
                               JDBCStore store)
Description copied from interface: FieldStrategy
Translate the given external field value to its datastore equivalent. If the mapping occupies multiple columns in the datastore, return an object array, else return a single object. Simply returns the given object by default.

Specified by:
toDataStoreValue in interface FieldStrategy
Overrides:
toDataStoreValue in class AbstractFieldStrategy

join

public Joins join(Joins joins,
                  boolean forceOuter)
Description copied from interface: FieldStrategy
Join this value to the class table. Does nothing by default.

Specified by:
join in interface FieldStrategy
Overrides:
join in class AbstractFieldStrategy

joinRelation

public Joins joinRelation(Joins joins,
                          boolean forceOuter,
                          boolean traverse)
Description copied from interface: FieldStrategy
Join this value's table to the table for the related first class object type, if any. Does nothing by default.

Specified by:
joinRelation in interface FieldStrategy
Overrides:
joinRelation in class AbstractFieldStrategy
traverse - if true, throw proper exception if it is not possible for this mapping to traverse into the related type


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