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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) 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.cfg;
import java.util.Map;

import org.hibernate.MappingException;
import org.hibernate.mapping.JoinedSubclass;
import org.hibernate.mapping.RootClass;

/**
 * @author Emmanuel Bernard
 */
public class CreateKeySecondPass implements SecondPass {
	private RootClass rootClass;
	private JoinedSubclass joinedSubClass;

	public CreateKeySecondPass(RootClass rootClass) {
		this.rootClass = rootClass;
	}

	public CreateKeySecondPass(JoinedSubclass joinedSubClass) {
		this.joinedSubClass = joinedSubClass;
	}

	public void doSecondPass(Map persistentClasses) throws MappingException {
		if ( rootClass != null ) {
			rootClass.createPrimaryKey();
		}
		else if ( joinedSubClass != null ) {
			joinedSubClass.createPrimaryKey();
			joinedSubClass.createForeignKey();
		}
		else {
			throw new AssertionError( "rootClass and joinedSubClass are null" );
		}
	}
}