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

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

All Implemented Interfaces:

Serializable, FieldStrategy, Strategy

Direct Known Subclasses:

MapTableFieldStrategy, StoreCollectionFieldStrategy

public abstract class ContainerFieldStrategy
extends AbstractFieldStrategy

An abstract container mapping that handles traversing the join to examine the size of the relation.

Author:

Marc Prud'hommeaux

See Also:

Serialized Form

Field Summary

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

field

Constructor Summary

ContainerFieldStrategy()

Method Summary

void	appendIsEmpty(SQLBuffer sql, Select sel, Joins joins) Append a where clause to the given statement checking if this value is empty.
void	appendIsNotEmpty(SQLBuffer sql, Select sel, Joins joins) Append a where clause to the given statement checking if this value is not empty.
void	appendIsNotNull(SQLBuffer sql, Select sel, Joins joins) Append a where clause to the given statement checking if this value is not null.
void	appendIsNull(SQLBuffer sql, Select sel, Joins joins) Append a where clause to the given statement checking if this value is null.
protected static void	appendJoinCount(SQLBuffer sql, Select sel, Joins joins, DBDictionary dict, FieldMapping field, ForeignKey fk)
void	appendSize(SQLBuffer sql, Select sel, Joins joins) Append a where clause to the given statement checking the size of the value.
static void	appendUnaliasedJoin(SQLBuffer sql, Select sel, Joins joins, DBDictionary dict, FieldMapping field, ForeignKey fk)
protected abstract 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 abstract ForeignKey	getJoinForeignKey()

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

assertNotMappedBy, isEagerSelectToMany, isVersionable, join, joinKey, joinKeyRelation, joinRelation, load, load, loadEagerJoin, loadEagerParallel, loadKeyProjection, loadProjection, select, selectEagerJoin, selectEagerParallel, setFieldMapping, supportsSelect, toDataStoreValue, toKeyDataStoreValue, where

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

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

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, delete, getAlias, initialize, insert, isCustomDelete, isCustomInsert, isCustomUpdate, map, update

Constructor Detail

ContainerFieldStrategy

public ContainerFieldStrategy()

Method Detail

getIndependentElementMappings

protected abstract 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.

Parameters:

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

See Also:

ValueMapping.getIndependentTypeMappings(), ClassMapping.EMPTY_MAPPINGS

appendIsEmpty

public void appendIsEmpty(SQLBuffer sql,
                          Select sel,
                          Joins joins)

Description copied from interface: FieldStrategy

Append a where clause to the given statement checking if this value is empty. Appends impossible-to-satisfy SQL by default.

Specified by:

appendIsEmpty in interface FieldStrategy

Overrides:

appendIsEmpty in class AbstractFieldStrategy

appendIsNotEmpty

public void appendIsNotEmpty(SQLBuffer sql,
                             Select sel,
                             Joins joins)

Description copied from interface: FieldStrategy

Append a where clause to the given statement checking if this value is not empty. Appends always-satisfied SQL by default.

Specified by:

appendIsNotEmpty in interface FieldStrategy

Overrides:

appendIsNotEmpty in class AbstractFieldStrategy

appendIsNull

public void appendIsNull(SQLBuffer sql,
                         Select sel,
                         Joins joins)

Description copied from interface: FieldStrategy

Append a where clause to the given statement checking if this value is null.

Specified by:

appendIsNull in interface FieldStrategy

Overrides:

appendIsNull in class AbstractFieldStrategy

appendIsNotNull

public void appendIsNotNull(SQLBuffer sql,
                            Select sel,
                            Joins joins)

Description copied from interface: FieldStrategy

Append a where clause to the given statement checking if this value is not null.

Specified by:

appendIsNotNull in interface FieldStrategy

Overrides:

appendIsNotNull in class AbstractFieldStrategy

getJoinForeignKey

protected abstract ForeignKey getJoinForeignKey()

appendSize

public void appendSize(SQLBuffer sql,
                       Select sel,
                       Joins joins)

Description copied from interface: FieldStrategy

Append a where clause to the given statement checking the size of the value.

Specified by:

appendSize in interface FieldStrategy

Overrides:

appendSize in class AbstractFieldStrategy

appendJoinCount

protected static void appendJoinCount(SQLBuffer sql,
                                      Select sel,
                                      Joins joins,
                                      DBDictionary dict,
                                      FieldMapping field,
                                      ForeignKey fk)

appendUnaliasedJoin

public static void appendUnaliasedJoin(SQLBuffer sql,
                                       Select sel,
                                       Joins joins,
                                       DBDictionary dict,
                                       FieldMapping field,
                                       ForeignKey fk)