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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.mapping;

import java.util.Iterator;

import org.hibernate.MappingException;
import org.hibernate.engine.Mapping;

/**
 * A subclass in a table-per-subclass mapping
 * @author Gavin King
 */
public class JoinedSubclass extends Subclass implements TableOwner {

	private Table table;
	private KeyValue key;

	public JoinedSubclass(PersistentClass superclass) {
		super(superclass);
	}

	public Table getTable() {
		return table;
	}

	public void setTable(Table table) {
		this.table=table;
		getSuperclass().addSubclassTable(table);
	}

	public KeyValue getKey() {
		return key;
	}

	public void setKey(KeyValue key) {
		this.key = key;
	}

	public void validate(Mapping mapping) throws MappingException {
		super.validate(mapping);
		if ( key!=null && !key.isValid(mapping) ) {
			throw new MappingException(
					"subclass key mapping has wrong number of columns: " +
					getEntityName() +
					" type: " +
					key.getType().getName()
				);
		}
	}

	public Iterator getReferenceablePropertyIterator() {
		return getPropertyIterator();
	}
	
	public Object accept(PersistentClassVisitor mv) {
		return mv.accept(this);
	}
}