KickJava   Java API By Example, From Geeks To Geeks.

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


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 public class ESNull extends ESBase {
32   ESNull()
33   {
34     prototype = ESBase.esBase;
35     className = "null";
36   }
37
38   public ESBase typeof() throws ESException
39   {
40     return ESString.create("object");
41   }
42
43   public Class JavaDoc getJavaType()
44   {
45     return Object JavaDoc.class;
46   }
47
48   public ESBase getProperty(ESString key) throws ESException
49   {
50     throw new ESNullException(className + " has no properties");
51   }
52
53   public void setProperty(ESString key, ESBase value) throws ESException
54   {
55     throw new ESNullException(className + " has no properties");
56   }
57
58   public double toNum() throws ESException
59   {
60     return 0;
61   }
62
63   public ESString toStr() throws ESException
64   {
65     return ESString.create("null");
66   }
67
68   public String JavaDoc toJavaString() throws ESException
69   {
70     return null;
71   }
72
73   public boolean ecmaEquals(ESBase b)
74   {
75     return this == b || b == esUndefined;
76   }
77 }
78
Popular Tags