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Java > Open Source Codes > com > caucho > es > ESBoolean


1 /*
2  * Copyright (c) 1998-2006 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.es;
30
31 /**
32  * Implementation class for JavaScript booleans.
33  */
34 public class ESBoolean extends ESBase {
35   public final static ESBoolean TRUE = new ESBoolean(true);
36   public final static ESBoolean FALSE = new ESBoolean(false);
37
38   boolean value;
39
40   public ESBase typeof() throws ESException
41   {
42     return ESString.create("boolean");
43   }
44
45   public Class JavaDoc getJavaType()
46   {
47     return boolean.class;
48   }
49
50   public boolean isBoolean()
51   {
52     return true;
53   }
54
55   public boolean toBoolean()
56   {
57     return value;
58   }
59
60   public double toNum()
61   {
62     return value ? 1.0 : 0.0 ;
63   }
64
65   public ESBase getProperty(ESString key) throws Throwable JavaDoc
66   {
67     return Global.getGlobalProto().boolProto.getProperty(key);
68   }
69
70   /**
71    * Returns this as a string.
72    */
73   public ESString toStr()
74   {
75     return ESString.create(value ? "true" : "false");
76   }
77
78   public ESObject toObject() throws ESException
79   {
80     return new ESWrapper("Boolean", Global.getGlobalProto().boolProto, this);
81   }
82
83   public Object JavaDoc toJavaObject()
84   {
85     return new Boolean JavaDoc(value);
86   }
87
88   public boolean ecmaEquals(ESBase b) throws Throwable JavaDoc
89   {
90     if (b == esNull || b == esEmpty || b == esUndefined)
91       return false;
92     else
93       return toNum() == b.toNum();
94   }
95
96   /**
97    * Returns the proper boolean
98    */
99   public static ESBoolean create(boolean value)
100   {
101     return value ? TRUE : FALSE;
102   }
103
104   /**
105    * Create a new object based on a prototype
106    */
107   private ESBoolean(boolean value)
108   {
109     super(null);
110
111     this.value = value;
112   }
113 }
114
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