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Java > Open Source Codes > com > caucho > util > NullEnumeration


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.util;
30
31 import java.util.Enumeration JavaDoc;
32
33 /**
34  * A null iterator
35  */
36 public class NullEnumeration implements Enumeration JavaDoc {
37   private static final NullEnumeration _singleton =
38     new NullEnumeration();
39
40   private NullEnumeration() {}
41
42   public static NullEnumeration create()
43   {
44     return _singleton;
45   }
46
47   public boolean hasMoreElements()
48   {
49     return false;
50   }
51
52   public Object JavaDoc nextElement()
53   {
54     return null;
55   }
56 }
57
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