KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > taglibs > standard > lang > jstl > BooleanLiteral


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 package org.apache.taglibs.standard.lang.jstl;
18
19 /**
20  *
21  * <p>An expression representing a boolean literal value
22  *
23  * @author Nathan Abramson - Art Technology Group
24  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: pierred $
25  **/
26
27 public class BooleanLiteral
28   extends Literal
29 {
30   //-------------------------------------
31 // Member variables
32 //-------------------------------------
33
34   public static final BooleanLiteral TRUE = new BooleanLiteral ("true");
35   public static final BooleanLiteral FALSE = new BooleanLiteral ("false");
36
37   //-------------------------------------
38 /**
39    *
40    * Constructor
41    **/
42   public BooleanLiteral (String JavaDoc pToken)
43   {
44     super (getValueFromToken (pToken));
45   }
46
47   //-------------------------------------
48 /**
49    *
50    * Parses the given token into the literal value
51    **/
52   static Object JavaDoc getValueFromToken (String JavaDoc pToken)
53   {
54     return
55       ("true".equals (pToken)) ?
56       Boolean.TRUE :
57       Boolean.FALSE;
58   }
59
60   //-------------------------------------
61 // Expression methods
62 //-------------------------------------
63 /**
64    *
65    * Returns the expression in the expression language syntax
66    **/
67   public String JavaDoc getExpressionString ()
68   {
69     return (getValue () == Boolean.TRUE) ? "true" : "false";
70   }
71
72   //-------------------------------------
73 }
74
Popular Tags