/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: Minus.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.operations;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XNumber;
import org.apache.xpath.objects.XObject;
/**
* The binary '-' operation expression executer.
*/
public class Minus extends Operation
{
static final long serialVersionUID = -5297672838170871043L;
/**
* Apply the operation to two operands, and return the result.
*
*
* @param left non-null reference to the evaluated left operand.
* @param right non-null reference to the evaluated right operand.
*
* @return non-null reference to the XObject that represents the
* result of the operation.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject operate(XObject left, XObject right)
throws javax.xml.transform.TransformerException
{
return new XNumber(left.num() - right.num());
}
/**
* Evaluate this operation directly to a double.
*
* @param xctxt The runtime execution context.
*
* @return The result of the operation as a double.
*
* @throws javax.xml.transform.TransformerException
*/
public double num(XPathContext xctxt)
throws javax.xml.transform.TransformerException
{
return (m_left.num(xctxt) - m_right.num(xctxt));
}
}