Hibernate example source code file (PluralAttributePath.java)

This example Hibernate source code file (PluralAttributePath.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

abstractpathimpl, attribute, collectionpersister, collectionpersister, criteriabuilderimpl, illegalargumentexception, io, override, plural, pluralattribute, pluralattribute, pluralattributepath, pluralattributepath, sessionfactoryimplementor, sessionfactoryimplementor

The Hibernate PluralAttributePath.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 java.io.Serializable;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.Bindable;
import javax.persistence.metamodel.PluralAttribute;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.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 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 = (SessionFactoryImplementor)
				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;
	}
}