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org.perfectjpattern.core.behavioral.command.TestNullParameter.testSingleton org.perfectjpattern.core.behavioral.command.TestNullParameter.testSingleton | 1 PASS | |
1 | //---------------------------------------------------------------------- | |
2 | // | |
3 | // PerfectJPattern: "Design patterns are good but components are better!" | |
4 | // NullParameter.java Copyright (c) 2009 Giovanni Azua Garcia | |
5 | // bravegag@hotmail.com | |
6 | // | |
7 | // This program is free software; you can redistribute it and/or | |
8 | // modify it under the terms of the GNU General Public License | |
9 | // as published by the Free Software Foundation; either version 3 | |
10 | // of the License, or (at your option) any later version. | |
11 | // | |
12 | // This program is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | // | |
17 | // You should have received a copy of the GNU General Public License | |
18 | // along with this program; if not, see <http://www.gnu.org/licenses/>. | |
19 | // | |
20 | //---------------------------------------------------------------------- | |
21 | package org.perfectjpattern.core.api.behavioral.command; | |
22 | ||
23 | import org.perfectjpattern.core.api.creational.singleton.ISingleton; | |
24 | ||
25 | /** | |
26 | * Null Object Pattern implementation of Command <code>Parameter</code>. | |
27 | * Prevents different <code>Command</code> implementations from pushing | |
28 | * <code>null</code> into the <code>Receiver</code>'s | |
29 | * <code>execute</code> method. | |
30 | * <br/><br/> | |
31 | * <code>NullParameter</code> is a Singleton therefore it can not be directly | |
32 | * instantiated, neither it may be extended. | |
33 | * <br/><br/> | |
34 | * | |
35 | * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a> | |
36 | * @version $Revision: 1.0 $ $Date: Jun 19, 2007 10:17:38 PM $ | |
37 | */ | |
38 | public final | |
39 | class NullParameter | |
40 | implements ISingleton | |
41 | { | |
42 | //------------------------------------------------------------------------ | |
43 | // public | |
44 | //------------------------------------------------------------------------ | |
45 | /** | |
46 | * Returns Singleton instance of <code>NullParameter</code>. | |
47 | * | |
48 | * @return Singleton instance of <code>NullParameter</code>. | |
49 | */ | |
50 | 2 | public static NullParameter |
51 | getInstance() | |
52 | { | |
53 | 2 | return INSTANCE; |
54 | } | |
55 | ||
56 | //------------------------------------------------------------------------ | |
57 | // private | |
58 | //------------------------------------------------------------------------ | |
59 | 1 | private |
60 | NullParameter() | |
61 | { | |
62 | // do nothing | |
63 | } | |
64 | ||
65 | //------------------------------------------------------------------------ | |
66 | // members | |
67 | //------------------------------------------------------------------------ | |
68 | /** | |
69 | * Singleton instance of <code>NullParameter</code> | |
70 | */ | |
71 | private static final NullParameter INSTANCE = new NullParameter(); | |
72 | } |
|