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Java > Open Source Codes > org > apache > xpath > operations > Bool


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /*
17  * $Id: Bool.java,v 1.9 2004/02/17 04:35:12 minchau Exp $
18  */
19 package org.apache.xpath.operations;
20
21 import org.apache.xpath.XPathContext;
22 import org.apache.xpath.objects.XBoolean;
23 import org.apache.xpath.objects.XObject;
24
25 /**
26  * The 'boolean()' operation expression executer.
27  */
28 public class Bool extends UnaryOperation
29 {
30
31   /**
32    * Apply the operation to two operands, and return the result.
33    *
34    *
35    * @param right non-null reference to the evaluated right operand.
36    *
37    * @return non-null reference to the XObject that represents the result of the operation.
38    *
39    * @throws javax.xml.transform.TransformerException
40    */
41   public XObject operate(XObject right) throws javax.xml.transform.TransformerException JavaDoc
42   {
43
44     if (XObject.CLASS_BOOLEAN == right.getType())
45       return right;
46     else
47       return right.bool() ? XBoolean.S_TRUE : XBoolean.S_FALSE;
48   }
49   
50   /**
51    * Evaluate this operation directly to a boolean.
52    *
53    * @param xctxt The runtime execution context.
54    *
55    * @return The result of the operation as a boolean.
56    *
57    * @throws javax.xml.transform.TransformerException
58    */
59   public boolean bool(XPathContext xctxt)
60           throws javax.xml.transform.TransformerException JavaDoc
61   {
62     return m_right.bool(xctxt);
63   }
64
65 }
66
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