1/*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5/*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements.  See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License.  You may obtain a copy of the License at
12 *
13 *      http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22package com.sun.org.apache.xpath.internal.operations;
23
24import com.sun.org.apache.xpath.internal.XPathContext;
25import com.sun.org.apache.xpath.internal.objects.XBoolean;
26import com.sun.org.apache.xpath.internal.objects.XObject;
27
28/**
29 * The 'and' operation expression executer.
30 */
31public class And extends Operation
32{
33    static final long serialVersionUID = 392330077126534022L;
34
35  /**
36   * AND two expressions and return the boolean result. Override
37   * superclass method for optimization purposes.
38   *
39   * @param xctxt The runtime execution context.
40   *
41   * @return {@link com.sun.org.apache.xpath.internal.objects.XBoolean#S_TRUE} or
42   * {@link com.sun.org.apache.xpath.internal.objects.XBoolean#S_FALSE}.
43   *
44   * @throws javax.xml.transform.TransformerException
45   */
46  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
47  {
48
49    XObject expr1 = m_left.execute(xctxt);
50
51    if (expr1.bool())
52    {
53      XObject expr2 = m_right.execute(xctxt);
54
55      return expr2.bool() ? XBoolean.S_TRUE : XBoolean.S_FALSE;
56    }
57    else
58      return XBoolean.S_FALSE;
59  }
60
61  /**
62   * Evaluate this operation directly to a boolean.
63   *
64   * @param xctxt The runtime execution context.
65   *
66   * @return The result of the operation as a boolean.
67   *
68   * @throws javax.xml.transform.TransformerException
69   */
70  public boolean bool(XPathContext xctxt)
71          throws javax.xml.transform.TransformerException
72  {
73    return (m_left.bool(xctxt) && m_right.bool(xctxt));
74  }
75
76}
77