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/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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: Neg.java,v 1.2.4.1 2005/09/14 21:31:45 jeffsuttor Exp $
*/
package com.sun.org.apache.xpath.internal.operations;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.objects.XNumber;
import com.sun.org.apache.xpath.internal.objects.XObject;
/**
* The unary '-' operation expression executer.
*/
public class Neg extends UnaryOperation
{
static final long serialVersionUID = -6280607702375702291L;
/**
* Apply the operation to two operands, and return the result.
*
*
* @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 right) throws javax.xml.transform.TransformerException
{
return new XNumber(-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_right.num(xctxt));
}
}
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