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: Or.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 'or' operation expression executer.
29 */
30public class Or extends Operation
31{
32    static final long serialVersionUID = -644107191353853079L;
33
34  /**
35   * OR two expressions and return the boolean result. Override
36   * superclass method for optimization purposes.
37   *
38   * @param xctxt The runtime execution context.
39   *
40   * @return {@link org.apache.xpath.objects.XBoolean#S_TRUE} or
41   * {@link org.apache.xpath.objects.XBoolean#S_FALSE}.
42   *
43   * @throws javax.xml.transform.TransformerException
44   */
45  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
46  {
47
48    XObject expr1 = m_left.execute(xctxt);
49
50    if (!expr1.bool())
51    {
52      XObject expr2 = m_right.execute(xctxt);
53
54      return expr2.bool() ? XBoolean.S_TRUE : XBoolean.S_FALSE;
55    }
56    else
57      return XBoolean.S_TRUE;
58  }
59
60  /**
61   * Evaluate this operation directly to a boolean.
62   *
63   * @param xctxt The runtime execution context.
64   *
65   * @return The result of the operation as a boolean.
66   *
67   * @throws javax.xml.transform.TransformerException
68   */
69  public boolean bool(XPathContext xctxt)
70          throws javax.xml.transform.TransformerException
71  {
72    return (m_left.bool(xctxt) || m_right.bool(xctxt));
73  }
74
75}
76