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: import java.util.Hashtable;
32:
33: final public class ESId extends ESString {
34: static Integer LOCK = new Integer(0);
35: // static HashMap intern = new HashMap();
36: static Hashtable intern;
37:
38: /**
39: * Create a new object based on a prototype
40: */
41: private ESId(String string) {
42: super (string);
43: }
44:
45: public static ESId intern(String string) {
46: if (intern == null) {
47: synchronized (LOCK) {
48: if (intern == null)
49: intern = new Hashtable();
50: }
51: }
52:
53: ESId value = (ESId) intern.get(string);
54: if (value != null)
55: return value;
56:
57: string = string.intern();
58:
59: value = new ESId(string);
60:
61: intern.put(string, value);
62:
63: return value;
64: }
65:
66: public final boolean equals(Object a) {
67: if (this == a)
68: return true;
69: else if (a instanceof ESId)
70: return false;
71: else if (a instanceof ESString)
72: return string.equals(((ESString) a).string);
73: else
74: return false;
75: }
76: }
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