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/*
 * $Id: UnionTree.java,v 1.1 2004/09/29 05:59:51 obecker Exp $
 * 
 * The contents of this file are subject to the Mozilla Public License 
 * Version 1.1 (the "License"); you may not use this file except in 
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the 
 * License.
 *
 * The Original Code is: this file
 *
 * The Initial Developer of the Original Code is Oliver Becker.
 *
 * Portions created by  ______________________ 
 * are Copyright (C) ______ _______________________. 
 * All Rights Reserved.
 *
 * Contributor(s): Thomas Behrends.
 */

package net.sf.joost.grammar.tree;

import net.sf.joost.grammar.Tree;
import net.sf.joost.stx.Context;

import org.xml.sax.SAXException;

/**
 * Objects of UnionTree represent union nodes ("|") in the syntax tree of a
 * pattern or an STXPath expression.
 * @version $Revision: 1.1 $ $Date: 2004/09/29 05:59:51 $
 * @author Oliver Becker
 */
final public class UnionTree extends Tree
{
   public UnionTree(Tree left,Tree right)
   {
      super(UNION, left, right);
   }

   public boolean matches(Context context, int top, boolean setPosition)
      throws SAXException
   {
      // Note: templates with a pattern containing a UNION will be split.
      // This branch should be encountered only for patterns at other 
      // places (for example in  or
      // 
      if (left.matches(context, top, false))
         return true;
      return right.matches(context, top, false);
   }

   public double getPriority()
   {
      return Double.NaN;
   }
}