| Clover Coverage Report - perfectjpattern(Aggregated) |
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| NullParameter | Line # 39 | 1 | 0% | 2 | 0 | 100% |
1.0
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| Result | |||
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1.0
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org.perfectjpattern.core.behavioral.command.TestNullParameter.testSingleton
org.perfectjpattern.core.behavioral.command.TestNullParameter.testSingleton
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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 | } | |
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