/*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You under the Apache License, Version 2.0

  * (the "License"); you may not use this file except in compliance with

  * the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.commons.el;

 /**

  *

  * <p>An expression representing a boolean literal value

  * 

  * @author Nathan Abramson - Art Technology Group

  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: bayard $

  **/

 public class BooleanLiteral

   extends Literal

 {

   //-------------------------------------

   // Member variables

   //-------------------------------------

   public static final BooleanLiteral TRUE = new BooleanLiteral ("true");

   public static final BooleanLiteral FALSE = new BooleanLiteral ("false");

   //-------------------------------------

   /**

    *

    * Constructor

    **/

   public BooleanLiteral (String pToken)

   {

     super (getValueFromToken (pToken));

   }

   //-------------------------------------

   /**

    *

    * Parses the given token into the literal value

    **/

   static Object getValueFromToken (String pToken)

   {

     return

       ("true".equals (pToken)) ?

       Boolean.TRUE :

       Boolean.FALSE;

   }

   //-------------------------------------

   // Expression methods

   //-------------------------------------

   /**

    *

    * Returns the expression in the expression language syntax

    **/

   public String getExpressionString ()

   {

     return (getValue () == Boolean.TRUE) ? "true" : "false";

   }

   //-------------------------------------

 }