booleanliteral.java

来自「jakarta-taglibs」· Java 代码 · 共 74 行

/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed 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.taglibs.standard.lang.jstl;

/**
 *
 * <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: pierred $
 **/

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";
  }

  //-------------------------------------
}