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Java > Open Source Codes > com > caucho > jmx > query > BooleanValueExp


1 /*
2  * Copyright (c) 1998-2002 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.jmx.query;
30
31 /**
32  * Represents a value expression
33  */
34 public class BooleanValueExp extends AbstractValueExp {
35   private static BooleanValueExp TRUE = new BooleanValueExp(true);
36   private static BooleanValueExp FALSE = new BooleanValueExp(false);
37   
38   private boolean _value;
39   
40   /**
41    * Creates a null string value expression with a value.
42    */
43   private BooleanValueExp(boolean value)
44   {
45     _value = value;
46   }
47
48   /**
49    * Creates the boolean value.
50    */
51   public static BooleanValueExp create(boolean value)
52   {
53     return value ? TRUE : FALSE;
54   }
55
56   /**
57    * Returns the underlying value as a string.
58    */
59   public String getString()
60   {
61     return String.valueOf(_value);
62   }
63
64   /**
65    * Returns the underlying value as a boolean.
66    */
67   public boolean getBoolean()
68   {
69     return _value;
70   }
71
72   /**
73    * Returns the underlying value as a long.
74    */
75   public long getLong()
76   {
77     return _value ? 1 : 0;
78   }
79
80   /**
81    * Returns the underlying value as a double.
82    */
83   public double getDouble()
84   {
85     return _value ? 1 : 0;
86   }
87
88   /**
89    * Returns the underlying string.
90    */
91   public String toString()
92   {
93     return String.valueOf(_value);
94   }
95 }
96
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