1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the  "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18/*
19 * $Id: Equals.java 468655 2006-10-28 07:12:06Z minchau $
20 */
21package org.apache.xpath.operations;
22
23import org.apache.xpath.XPathContext;
24import org.apache.xpath.objects.XBoolean;
25import org.apache.xpath.objects.XObject;
26
27/**
28 * The '=' operation expression executer.
29 */
30public class Equals extends Operation
31{
32    static final long serialVersionUID = -2658315633903426134L;
33
34  /**
35   * Apply the operation to two operands, and return the result.
36   *
37   *
38   * @param left non-null reference to the evaluated left operand.
39   * @param right non-null reference to the evaluated right operand.
40   *
41   * @return non-null reference to the XObject that represents the result of the operation.
42   *
43   * @throws javax.xml.transform.TransformerException
44   */
45  public XObject operate(XObject left, XObject right)
46          throws javax.xml.transform.TransformerException
47  {
48    return left.equals(right) ? XBoolean.S_TRUE : XBoolean.S_FALSE;
49  }
50
51  /**
52   * Execute a binary operation by calling execute on each of the operands,
53   * and then calling the operate method on the derived class.
54   *
55   *
56   * @param xctxt The runtime execution context.
57   *
58   * @return The XObject result of the operation.
59   *
60   * @throws javax.xml.transform.TransformerException
61   */
62  public boolean bool(XPathContext xctxt)
63          throws javax.xml.transform.TransformerException
64  {
65    XObject left = m_left.execute(xctxt, true);
66    XObject right = m_right.execute(xctxt, true);
67
68    boolean result = left.equals(right) ? true : false;
69	left.detach();
70	right.detach();
71    return result;
72  }
73
74}
75