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/*
 * $Header$
 * $Revision$
 * $Date$
 *
 * ====================================================================
 *
 * Copyright 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 
 *   * Neither the name of the Jaxen Project nor the names of its
 *     contributors may be used to endorse or promote products derived 
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter  and 
 * James Strachan .  For more information on the 
 * Jaxen Project, please see .
 * 
 * $Id$
 */

package org.jaxen.expr;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.jaxen.Context;
import org.jaxen.JaxenException;

/**
 * @deprecated this class will become non-public in the future; use the interface instead
 */
@SuppressWarnings({"rawtypes", "unchecked"})
public class DefaultUnionExpr extends DefaultBinaryExpr implements UnionExpr {
	/**
	 * 
	 */
	private static final long serialVersionUID = 7629142718276852707L;

	public DefaultUnionExpr(Expr lhs, Expr rhs) {
		super(lhs, rhs);
	}

	public String getOperator() {
		return "|";
	}

	public String toString() {
		return "[(DefaultUnionExpr): " + getLHS() + ", " + getRHS() + "]";
	}

	public Object evaluate(Context context) throws JaxenException {
		List results = new ArrayList();

		try {
			List lhsResults = (List) getLHS().evaluate(context);
			List rhsResults = (List) getRHS().evaluate(context);

			Set unique = new HashSet();

			results.addAll(lhsResults);
			unique.addAll(lhsResults);

			Iterator rhsIter = rhsResults.iterator();

			while (rhsIter.hasNext()) {
				Object each = rhsIter.next();

				if (!unique.contains(each)) {
					results.add(each);
					unique.add(each);
				}
			}

			Collections.sort(results, new NodeComparator(context.getNavigator()));

			return results;
		} catch (ClassCastException e) {
			throw new JaxenException(this.getText() + "Unions are only allowed over node-sets");
		}
	}

}