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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.loader.plan.build.internal.spaces;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.loader.plan.spi.CollectionQuerySpace;
import org.hibernate.loader.plan.spi.CompositeQuerySpace;
import org.hibernate.loader.plan.spi.EntityQuerySpace;
import org.hibernate.loader.plan.spi.JoinDefinedByMetadata;
import org.hibernate.loader.plan.spi.QuerySpace;
import org.hibernate.persister.entity.Joinable;
import org.hibernate.persister.entity.PropertyMapping;
import org.hibernate.type.CollectionType;
import org.hibernate.type.CompositeType;
import org.hibernate.type.EntityType;
/**
* @author Steve Ebersole
* @author Gail Badner
*/
public class JoinHelper {
/**
* Singleton access
*/
public static final JoinHelper INSTANCE = new JoinHelper();
private JoinHelper() {
}
public JoinDefinedByMetadata createEntityJoin(
QuerySpace leftHandSide,
String lhsPropertyName,
EntityQuerySpace rightHandSide,
boolean rightHandSideRequired,
EntityType joinedPropertyType,
SessionFactoryImplementor sessionFactory) {
return new JoinImpl(
leftHandSide,
lhsPropertyName,
rightHandSide,
determineRhsColumnNames( joinedPropertyType, sessionFactory ),
joinedPropertyType,
rightHandSideRequired
);
}
public JoinDefinedByMetadata createCollectionJoin(
QuerySpace leftHandSide,
String lhsPropertyName,
CollectionQuerySpace rightHandSide,
boolean rightHandSideRequired,
CollectionType joinedPropertyType,
SessionFactoryImplementor sessionFactory) {
return new JoinImpl(
leftHandSide,
lhsPropertyName,
rightHandSide,
joinedPropertyType.getAssociatedJoinable( sessionFactory ).getKeyColumnNames(),
joinedPropertyType,
rightHandSideRequired
);
}
public JoinDefinedByMetadata createCompositeJoin(
QuerySpace leftHandSide,
String lhsPropertyName,
CompositeQuerySpace rightHandSide,
boolean rightHandSideRequired,
CompositeType joinedPropertyType) {
return new JoinImpl(
leftHandSide,
lhsPropertyName,
rightHandSide,
null,
joinedPropertyType,
rightHandSideRequired
);
}
private static String[] determineRhsColumnNames(EntityType entityType, SessionFactoryImplementor sessionFactory) {
final Joinable persister = entityType.getAssociatedJoinable( sessionFactory );
return entityType.getRHSUniqueKeyPropertyName() == null ?
persister.getKeyColumnNames() :
( (PropertyMapping) persister ).toColumns( entityType.getRHSUniqueKeyPropertyName() );
}
}