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/*
 * $Header: /cvs/jaxen/jaxen/src/java/main/org/jaxen/pattern/UnionPattern.java,v 1.8 2006/02/05 21:47:42 elharo Exp $
 * $Revision: 1.8 $
 * $Date: 2006/02/05 21:47:42 $
 *
 * ====================================================================
 *
 * 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: UnionPattern.java,v 1.8 2006/02/05 21:47:42 elharo Exp $
 */

package org.navimatrix.jaxen.pattern;

import org.navimatrix.jaxen.Context;
import org.navimatrix.jaxen.JaxenException;

/** UnionPattern represents a union pattern.
  *
  * @author James Strachan
  * @version $Revision: 1.8 $
  */
public class UnionPattern extends Pattern {

    private Pattern lhs;
    private Pattern rhs;
    private short nodeType = ANY_NODE;
    private String matchesNodeName = null;
    
    
    public UnionPattern() 
    {
    }
    
    public UnionPattern(Pattern lhs, Pattern rhs) 
    {
        this.lhs = lhs;
        this.rhs = rhs;
        init();
    }
    
    
    public Pattern getLHS() 
    {
        return lhs;
    }
    
    public void setLHS(Pattern lhs) 
    {
        this.lhs = lhs;
        init();
    }
    
    public Pattern getRHS() 
    {
        return rhs;
    }
    
    public void setRHS(Pattern rhs) 
    {
        this.rhs = rhs;
        init();
    }
    
    
    // Pattern interface
    //-------------------------------------------------------------------------    
    
    /** @return true if the pattern matches the given node
      */
    public boolean matches( Object node, Context context ) throws JaxenException
    {
        return lhs.matches( node, context ) || rhs.matches( node, context );
    }
    
    public Pattern[] getUnionPatterns() 
    {
        return new Pattern[] { lhs, rhs };
    }

    
    public short getMatchType() 
    {
        return nodeType;
    }


    public String getMatchesNodeName() 
    {
        return matchesNodeName;
    }
    
    
    public Pattern simplify() 
    {
        this.lhs = lhs.simplify();
        this.rhs = rhs.simplify();
        init();
        return this;
    }
    
    public String getText() 
    {
        return lhs.getText() + " | " + rhs.getText();
    }
        
    public String toString()
    {
        return super.toString() + "[ lhs: " + lhs + " rhs: " + rhs + " ]";
    }
    
    // Implementation methods
    //-------------------------------------------------------------------------    
    private void init() 
    {
        short type1 = lhs.getMatchType();
        short type2 = rhs.getMatchType();
        this.nodeType = ( type1 == type2 ) ? type1 : ANY_NODE;
        
        String name1 = lhs.getMatchesNodeName();
        String name2 = rhs.getMatchesNodeName();
        
        this.matchesNodeName = null;
        if ( name1 != null && name2 != null && name1.equals( name2 ) ) 
        {
            this.matchesNodeName = name1;
        }
    }    
}