/*
* 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();
}
}