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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 org.jaxen.Context;
import org.jaxen.JaxenException;
import org.jaxen.function.NumberFunction;

class DefaultMinusExpr extends DefaultAdditiveExpr
{
    /**
     * 
     */
    private static final long serialVersionUID = 6468563688098527800L;

    DefaultMinusExpr(Expr lhs,
                            Expr rhs)
    {
        super( lhs,
               rhs );
    }

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

    public Object evaluate(Context context) throws JaxenException
    {
        Number lhsValue = NumberFunction.evaluate( getLHS().evaluate( context ),
                                                   context.getNavigator() );
        Number rhsValue = NumberFunction.evaluate( getRHS().evaluate( context ),
                                                   context.getNavigator() );

        double result = lhsValue.doubleValue() - rhsValue.doubleValue();
        return Double.valueOf( result );
    }

}