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55
56 package org.apache.commons.el;
57
58 /**
59  *
60  * <p>An expression representing a boolean literal value
61  *
62  * @author Nathan Abramson - Art Technology Group
63  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
64  **/
65
66 public class BooleanLiteral
67   extends Literal
68 {
69   //-------------------------------------
70 // Member variables
71 //-------------------------------------
72
73   public static final BooleanLiteral TRUE = new BooleanLiteral ("true");
74   public static final BooleanLiteral FALSE = new BooleanLiteral ("false");
75
76   //-------------------------------------
77 /**
78    *
79    * Constructor
80    **/
81   public BooleanLiteral (String JavaDoc pToken)
82   {
83     super (getValueFromToken (pToken));
84   }
85
86   //-------------------------------------
87 /**
88    *
89    * Parses the given token into the literal value
90    **/
91   static Object JavaDoc getValueFromToken (String JavaDoc pToken)
92   {
93     return
94       ("true".equals (pToken)) ?
95       Boolean.TRUE :
96       Boolean.FALSE;
97   }
98
99   //-------------------------------------
100 // Expression methods
101 //-------------------------------------
102 /**
103    *
104    * Returns the expression in the expression language syntax
105    **/
106   public String JavaDoc getExpressionString ()
107   {
108     return (getValue () == Boolean.TRUE) ? "true" : "false";
109   }
110
111   //-------------------------------------
112 }
113
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