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

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.RelationMapTableFieldStrategy

All Implemented Interfaces:

Serializable, FieldStrategy, Strategy, LRSMapFieldStrategy

public class RelationMapTableFieldStrategy
extends RelationToManyTableFieldStrategy
implements LRSMapFieldStrategy

Uses an association table to hold map values. Derives map keys from a field in each value.

Author:

Abe White

See Also:

Serialized Form

Field Summary

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

field

Constructor Summary

RelationMapTableFieldStrategy()

Method Summary

protected void	add(JDBCStore store, Object coll, Object obj) Add an item to the data structure representing a field value.
Object	deriveKey(JDBCStore store, Object value) Some mapping derive keys from map values.
Object	deriveValue(JDBCStore store, Object key) Some mapping derive values from map keys.
FieldMapping	getFieldMapping() The owning field mapping.
ClassMapping[]	getIndependentKeyMappings(boolean traverse) Return all independent mappings to which this strategy must join in order to access map keys, or empty array if none.
ClassMapping[]	getIndependentValueMappings(boolean traverse) Return all independent mappings to which this strategy must join in order to access map values, or empty array if none.
ForeignKey	getJoinForeignKey(ClassMapping cls) Return the foreign key used to join to the owning field for the given element mapping from ContainerFieldStrategy.getIndependentElementMappings(boolean) (or null).
Column[]	getKeyColumns(ClassMapping cls) Return the columns holding data for a map key for the given key mapping from LRSMapFieldStrategy.getIndependentKeyMappings(boolean) or LRSMapFieldStrategy.getIndependentValueMappings(boolean) (or null).
Result[]	getResults(OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, int eagerMode, Joins[] joins, boolean lrs) Return results containing all keys and values for this map.
Column[]	getValueColumns(ClassMapping cls) Return the columns holding data for a map value for the given value mapping from LRSMapFieldStrategy.getIndependentKeyMappings(boolean) or LRSMapFieldStrategy.getIndependentValueMappings(boolean) (or null).
Joins	joinKey(Joins joins, boolean forceOuter) Join the key value to the class table.
Joins	joinKeyRelation(Joins joins, boolean forceOuter, boolean traverse) Join this value's table to the table for the related first class object key type, if any.
Joins	joinKeyRelation(Joins joins, ClassMapping key) Join this value's table to the table for the given key mapping from LRSMapFieldStrategy.getIndependentKeyMappings(boolean) (or null).
Joins	joinValueRelation(Joins joins, ClassMapping val) Join this value's table to the table for the given value mapping from LRSMapFieldStrategy.getIndependentValueMappings(boolean) (or null).
Object	loadKey(OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, Result res, Joins joins) Load a key from the given result.
Object	loadValue(OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, Result res, Joins joins) Load a value from the given result.
void	map(boolean adapt) Map the owning mapping using this strategy.
protected Proxy	newLRSProxy() Return a large result set proxy for this field.
void	selectKey(Select sel, ClassMapping key, OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, Joins joins) Implement this method to select the keys of this field.
void	selectValue(Select sel, ClassMapping val, OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, Joins joins) Implement this method to select the values of this field.
protected Collection	toCollection(Object val) Convert the field value to a collection.

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

delete, getIndependentElementMappings, insert, join, join, joinElementRelation, joinRelation, loadElement, selectElement, toDataStoreValue, update

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

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

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

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

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

appendType, assertNotMappedBy, isVersionable, 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

appendIndex, appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, appendType, isEagerSelectToMany, isVersionable, join, 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

RelationMapTableFieldStrategy

public RelationMapTableFieldStrategy()

Method Detail

getFieldMapping

public FieldMapping getFieldMapping()

Description copied from interface: LRSMapFieldStrategy

The owning field mapping.

Specified by:

getFieldMapping in interface LRSMapFieldStrategy

getIndependentKeyMappings

public ClassMapping[] getIndependentKeyMappings(boolean traverse)

Description copied from interface: LRSMapFieldStrategy

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

Specified by:

getIndependentKeyMappings in interface LRSMapFieldStrategy

See Also:

ValueMapping.getIndependentTypeMappings(), ClassMapping.EMPTY_MAPPINGS

getIndependentValueMappings

public ClassMapping[] getIndependentValueMappings(boolean traverse)

Description copied from interface: LRSMapFieldStrategy

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

Specified by:

getIndependentValueMappings in interface LRSMapFieldStrategy

See Also:

ValueMapping.getIndependentTypeMappings(), ClassMapping.EMPTY_MAPPINGS

getJoinForeignKey

public ForeignKey getJoinForeignKey(ClassMapping cls)

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 LRSMapFieldStrategy

Overrides:

getJoinForeignKey in class RelationToManyTableFieldStrategy

getKeyColumns

public Column[] getKeyColumns(ClassMapping cls)

Description copied from interface: LRSMapFieldStrategy

Return the columns holding data for a map key for the given key mapping from LRSMapFieldStrategy.getIndependentKeyMappings(boolean) or LRSMapFieldStrategy.getIndependentValueMappings(boolean) (or null).

Specified by:

getKeyColumns in interface LRSMapFieldStrategy

getValueColumns

public Column[] getValueColumns(ClassMapping cls)

Description copied from interface: LRSMapFieldStrategy

Return the columns holding data for a map value for the given value mapping from LRSMapFieldStrategy.getIndependentKeyMappings(boolean) or LRSMapFieldStrategy.getIndependentValueMappings(boolean) (or null).

Specified by:

getValueColumns in interface LRSMapFieldStrategy

selectKey

public void selectKey(Select sel,
                      ClassMapping key,
                      OpenJPAStateManager sm,
                      JDBCStore store,
                      JDBCFetchConfiguration fetch,
                      Joins joins)

Description copied from interface: LRSMapFieldStrategy

Implement this method to select the keys of this field. Elements of the result will be loaded with LRSMapFieldStrategy.loadKey(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). This method is only used if the key is not derived from the value.

Specified by:

selectKey in interface LRSMapFieldStrategy

loadKey

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

Description copied from interface: LRSMapFieldStrategy

Load a key from the given result. This method is only used if the key is not derived from the value.

Specified by:

loadKey in interface LRSMapFieldStrategy

Throws:

SQLException

deriveKey

public Object deriveKey(JDBCStore store,
                        Object value)

Description copied from interface: LRSMapFieldStrategy

Some mapping derive keys from map values. Other mappings may return null.

Specified by:

deriveKey in interface LRSMapFieldStrategy

deriveValue

public Object deriveValue(JDBCStore store,
                          Object key)

Description copied from interface: LRSMapFieldStrategy

Some mapping derive values from map keys. Other mappings may return null.

Specified by:

deriveValue in interface LRSMapFieldStrategy

selectValue

public void selectValue(Select sel,
                        ClassMapping val,
                        OpenJPAStateManager sm,
                        JDBCStore store,
                        JDBCFetchConfiguration fetch,
                        Joins joins)

Description copied from interface: LRSMapFieldStrategy

Implement this method to select the values of this field. Elements of the result will be loaded with LRSMapFieldStrategy.loadValue(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:

selectValue in interface LRSMapFieldStrategy

loadValue

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

Description copied from interface: LRSMapFieldStrategy

Load a value from the given result.

Specified by:

loadValue in interface LRSMapFieldStrategy

Throws:

SQLException

getResults

public Result[] getResults(OpenJPAStateManager sm,
                           JDBCStore store,
                           JDBCFetchConfiguration fetch,
                           int eagerMode,
                           Joins[] joins,
                           boolean lrs)
                    throws SQLException

Description copied from interface: LRSMapFieldStrategy

Return results containing all keys and values for this map. If only one result is needed, set both array indexes to the same result instance. Also fill in the key and value joins in the given array. The results will be loaded with the LRSMapFieldStrategy.loadKey(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) or LRSMapFieldStrategy.deriveKey(org.apache.openjpa.jdbc.kernel.JDBCStore, java.lang.Object) and LRSMapFieldStrategy.loadValue(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) methods.

Specified by:

getResults in interface LRSMapFieldStrategy

Throws:

SQLException

joinKeyRelation

public Joins joinKeyRelation(Joins joins,
                             ClassMapping key)

Description copied from interface: LRSMapFieldStrategy

Join this value's table to the table for the given key mapping from LRSMapFieldStrategy.getIndependentKeyMappings(boolean) (or null).

Specified by:

joinKeyRelation in interface LRSMapFieldStrategy

joinKeyRelation

public Joins joinKeyRelation(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 key type, if any. Does nothing by default.

Specified by:

joinKeyRelation in interface FieldStrategy

Overrides:

joinKeyRelation in class AbstractFieldStrategy

traverse - if true, throw proper exception if it is not possible for this mapping to traverse into the related type

joinValueRelation

public Joins joinValueRelation(Joins joins,
                               ClassMapping val)

Description copied from interface: LRSMapFieldStrategy

Join this value's table to the table for the given value mapping from LRSMapFieldStrategy.getIndependentValueMappings(boolean) (or null).

Specified by:

joinValueRelation in interface LRSMapFieldStrategy

newLRSProxy

protected Proxy newLRSProxy()

Description copied from class: StoreCollectionFieldStrategy

Return a large result set proxy for this field.

Specified by:

newLRSProxy in class StoreCollectionFieldStrategy

add

protected void add(JDBCStore store,
                   Object coll,
                   Object obj)

Description copied from class: StoreCollectionFieldStrategy

Add an item to the data structure representing a field value. By default, assumes the structure is a collection.

Overrides:

add in class StoreCollectionFieldStrategy

toCollection

protected Collection toCollection(Object val)

Description copied from class: StoreCollectionFieldStrategy

Convert the field value to a collection. Handles collections and arrays by default.

Overrides:

toCollection 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

joinKey

public Joins joinKey(Joins joins,
                     boolean forceOuter)

Description copied from interface: FieldStrategy

Join the key value to the class table. Does nothing by default.

Specified by:

joinKey in interface FieldStrategy

Overrides:

joinKey in class AbstractFieldStrategy