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The core O/RM functionality as provided by Hibernate

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/*
 * 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.returns;

import org.hibernate.loader.plan.spi.CollectionFetchableIndex;
import org.hibernate.loader.plan.spi.CollectionReference;
import org.hibernate.loader.plan.spi.EntityReference;
import org.hibernate.loader.plan.spi.Fetch;

/**
 * @author Gail Badner
 */
public class CollectionFetchableIndexAnyGraph extends AbstractAnyReference implements CollectionFetchableIndex {
	private final CollectionReference collectionReference;

	public CollectionFetchableIndexAnyGraph(CollectionReference collectionReference) {
		super(
				// this property path is just informational...
				collectionReference.getPropertyPath().append( "" )
		);
		this.collectionReference = collectionReference;
	}

	@Override
	public CollectionReference getCollectionReference() {
		return collectionReference;
	}

	@Override
	public EntityReference resolveEntityReference() {
		return Fetch.class.isInstance( collectionReference ) ?
				Fetch.class.cast( collectionReference ).getSource().resolveEntityReference() :
				null;
	}
}