01: /*
02: * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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: prototype = ESBase.esBase;
34: className = "null";
35: }
36:
37: public ESBase typeof() throws ESException {
38: return ESString.create("object");
39: }
40:
41: public Class getJavaType() {
42: return Object.class;
43: }
44:
45: public ESBase getProperty(ESString key) throws ESException {
46: throw new ESNullException(className + " has no properties");
47: }
48:
49: public void setProperty(ESString key, ESBase value)
50: throws ESException {
51: throw new ESNullException(className + " has no properties");
52: }
53:
54: public double toNum() throws ESException {
55: return 0;
56: }
57:
58: public ESString toStr() throws ESException {
59: return ESString.create("null");
60: }
61:
62: public String toJavaString() throws ESException {
63: return null;
64: }
65:
66: public boolean ecmaEquals(ESBase b) {
67: return this == b || b == esUndefined;
68: }
69: }
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