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org.perfectjpattern.core.behavioral.chainofresponsibility.TestExample.testChainOfResponsibility org.perfectjpattern.core.behavioral.chainofresponsibility.TestExample.testChainOfResponsibility | 1 PASS | |
1 | //---------------------------------------------------------------------- | |
2 | // | |
3 | // PerfectJPattern: "Design patterns are good but components are better!" | |
4 | // FirstNHandleStrategy.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.behavioral.chainofresponsibility; | |
22 | ||
23 | import org.perfectjpattern.core.api.behavioral.chainofresponsibility.*; | |
24 | ||
25 | /** | |
26 | * Concrete implementation of <code>IChainStrategy</code> that allows | |
27 | * only one <code>IHandler</code> to handle the given request then stops the | |
28 | * processing of the chain. | |
29 | * <br/><br/> | |
30 | * <code>OnlyOneHandleStrategy</code> is stateless, reentrant and a Singleton | |
31 | * therefore it may not be directly instantiated, neither it may be extended. | |
32 | * | |
33 | * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a> | |
34 | * @version $Revision: 1.0 $ $Date: Nov 8, 2007 9:57:12 PM $ | |
35 | */ | |
36 | public final | |
37 | class OnlyOneHandleStrategy | |
38 | implements IChainStrategy | |
39 | { | |
40 | //------------------------------------------------------------------------ | |
41 | /** | |
42 | * Returns Singleton instance of <code>OnlyOneHandlesStrategy</code>. | |
43 | * | |
44 | * @return Singleton instance of <code>OnlyOneHandlesStrategy</code>. | |
45 | */ | |
46 | 26 | public static IChainStrategy |
47 | getInstance() | |
48 | { | |
49 | 26 | return INSTANCE; |
50 | } | |
51 | ||
52 | //------------------------------------------------------------------------ | |
53 | /** | |
54 | * {@inheritDoc} | |
55 | */ | |
56 | 9 | public void |
57 | process(IHandler<Object> aHandler, Object aRequest) | |
58 | { | |
59 | 9 | if (aHandler.canHandle(aRequest)) |
60 | { | |
61 | 6 | aHandler.handle(aRequest); |
62 | } | |
63 | else | |
64 | { | |
65 | 3 | aHandler.getSuccessor().start(aRequest); |
66 | } | |
67 | } | |
68 | ||
69 | //------------------------------------------------------------------------ | |
70 | // private | |
71 | //------------------------------------------------------------------------ | |
72 | 2 | private |
73 | OnlyOneHandleStrategy() | |
74 | { | |
75 | // do nothing | |
76 | } | |
77 | ||
78 | //------------------------------------------------------------------------ | |
79 | // members | |
80 | //------------------------------------------------------------------------ | |
81 | private static final IChainStrategy INSTANCE = new OnlyOneHandleStrategy(); | |
82 | } |
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