Hibernate example source code file (PluralAttributeJoinSupport.java)

This example Hibernate source code file (PluralAttributeJoinSupport.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

abstractjoinimpl, c, c, criteriabuilderimpl, e, e, managedtype, o, o, override, override, pluralattribute, pluralattributejoinsupport, pluraljoin

The Hibernate PluralAttributeJoinSupport.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, 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.ejb.criteria.path;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.PluralJoin;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.ManagedType;
import javax.persistence.metamodel.PluralAttribute;
import javax.persistence.metamodel.Type;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.criteria.PathSource;

/**
 * Support for defining joins to plural attributes (JPA requires typing based on
 * the specific collection type so we cannot really implement all support in a
 * single class)
 *
 * @author Steve Ebersole
 */
public abstract class PluralAttributeJoinSupport<O,C,E>
		extends AbstractJoinImpl<O,E>
		implements PluralJoin<O,C,E> {

	public PluralAttributeJoinSupport(
			CriteriaBuilderImpl criteriaBuilder,
			Class<E> javaType,
			PathSource<O> pathSource,
			Attribute<? super O,?> joinAttribute,
			JoinType joinType) {
		super( criteriaBuilder, javaType, pathSource, joinAttribute, joinType );
	}

	@Override
	public PluralAttribute<? super O, C, E> getAttribute() {
		return (PluralAttribute<? super O, C, E>) super.getAttribute();
	}

	public PluralAttribute<? super O, C, E> getModel() {
		return getAttribute();
	}

	@Override
	protected ManagedType<E> locateManagedType() {
		return isBasicCollection()
				? null
				: (ManagedType<E>) getAttribute().getElementType();
	}

	public boolean isBasicCollection() {
		return Type.PersistenceType.BASIC.equals( getAttribute().getElementType().getPersistenceType() );
	}

	@Override
	protected boolean canBeDereferenced() {
		return !isBasicCollection();
	}

	@Override
	protected boolean canBeJoinSource() {
		return !isBasicCollection();
	}
}