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 * 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
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 *      http://www.apache.org/licenses/LICENSE-2.0
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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 binary '-' operation expression executer.
/**
 * 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.
Params:
left – non-null reference to the evaluated left operand.
right – non-null reference to the evaluated right operand.
Throws:
TransformerException – 
Returns:
non-null reference to the XObject that represents the
        result of the operation./**
   * 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.
Params:
xctxt – The runtime execution context.
Throws:
TransformerException – 
Returns:
The result of the operation as a double./**
   * 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));
  }

}