1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.el;
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: bayard $
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 pToken)
43 {
44 super (getValueFromToken (pToken));
45 }
46
47 //-------------------------------------
48 /**
49 *
50 * Parses the given token into the literal value
51 **/
52 static Object getValueFromToken (String 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 getExpressionString ()
68 {
69 return (getValue () == Boolean.TRUE) ? "true" : "false";
70 }
71
72 //-------------------------------------
73 }