Package org.hibernate.loader.plan.build.internal.spaces

Source Code of org.hibernate.loader.plan.build.internal.spaces.JoinHelper

/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2013, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors.  All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA  02110-1301  USA
*/
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() );
  }
}
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