/*
* 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.jpa.criteria.path;
import java.io.Serializable;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.Bindable;
import javax.persistence.metamodel.PluralAttribute;
import org.hibernate.jpa.criteria.CriteriaBuilderImpl;
import org.hibernate.jpa.criteria.PathSource;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.persister.collection.CollectionPersister;
/**
* Models a path for a {@link PluralAttribute} generally obtained from a
* {@link javax.persistence.criteria.Path#get} call
*
* @author Steve Ebersole
*/
public class PluralAttributePath<X> extends AbstractPathImpl<X> implements Serializable {
private final PluralAttribute<?,X,?> attribute;
private final CollectionPersister persister;
public PluralAttributePath(
CriteriaBuilderImpl criteriaBuilder,
PathSource source,
PluralAttribute<?,X,?> attribute) {
super( criteriaBuilder, attribute.getJavaType(), source );
this.attribute = attribute;
this.persister = resolvePersister( criteriaBuilder, attribute );
}
private static CollectionPersister resolvePersister(CriteriaBuilderImpl criteriaBuilder, PluralAttribute attribute) {
SessionFactoryImplementor sfi = criteriaBuilder.getEntityManagerFactory().getSessionFactory();
return sfi.getCollectionPersister( resolveRole( attribute ) );
}
private static String resolveRole(PluralAttribute attribute) {
return attribute.getDeclaringType().getJavaType().getName() +
'.' + attribute.getName();
}
public PluralAttribute<?,X,?> getAttribute() {
return attribute;
}
@SuppressWarnings({ "UnusedDeclaration" })
public CollectionPersister getPersister() {
return persister;
}
@Override
protected boolean canBeDereferenced() {
// cannot be dereferenced
return false;
}
@Override
protected Attribute locateAttributeInternal(String attributeName) {
throw new IllegalArgumentException( "Plural attribute paths cannot be further dereferenced" );
}
public Bindable<X> getModel() {
// the issue here is the parameterized type; X is the collection
// type (Map, Set, etc) while the "bindable" for a collection is the
// elements.
//
// TODO : throw exception instead?
return null;
}
@Override
public <T extends X> PluralAttributePath<T> treatAs(Class<T> treatAsType) {
throw new UnsupportedOperationException(
"Plural attribute path [" + getPathSource().getPathIdentifier() + '.'
+ attribute.getName() + "] cannot be dereferenced"
);
}
}