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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, 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.envers.configuration.internal;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.hibernate.cfg.Configuration;
import org.hibernate.envers.internal.tools.Tools;
import org.hibernate.envers.internal.tools.graph.GraphDefiner;
import org.hibernate.mapping.PersistentClass;

/**
 * Defines a graph, where the vertexes are all persistent classes, and there is an edge from
 * p.c. A to p.c. B iff A is a superclass of B.
 *
 * @author Adam Warski (adam at warski dot org)
 */
public class PersistentClassGraphDefiner implements GraphDefiner {
	private Configuration cfg;

	public PersistentClassGraphDefiner(Configuration cfg) {
		this.cfg = cfg;
	}

	@Override
	public String getRepresentation(PersistentClass pc) {
		return pc.getEntityName();
	}

	@Override
	public PersistentClass getValue(String entityName) {
		return cfg.getClassMapping( entityName );
	}

	@SuppressWarnings({"unchecked"})
	private void addNeighbours(List neighbours, Iterator subclassIterator) {
		while ( subclassIterator.hasNext() ) {
			final PersistentClass subclass = subclassIterator.next();
			neighbours.add( subclass );
			addNeighbours( neighbours, (Iterator) subclass.getSubclassIterator() );
		}
	}

	@Override
	@SuppressWarnings({"unchecked"})
	public List getNeighbours(PersistentClass pc) {
		final List neighbours = new ArrayList();

		addNeighbours( neighbours, (Iterator) pc.getSubclassIterator() );

		return neighbours;
	}

	@Override
	@SuppressWarnings({"unchecked"})
	public List getValues() {
		return Tools.iteratorToList( cfg.getClassMappings() );
	}
}