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org.perfectjpattern.core.behavioral.delegate.TestExample.testCommand
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1 | //---------------------------------------------------------------------- | |
2 | // | |
3 | // PerfectJPattern: "Design patterns are good but components are better!" | |
4 | // Example.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.delegate; | |
22 | ||
23 | import java.util.*; | |
24 | ||
25 | import org.perfectjpattern.core.api.extras.delegate.*; | |
26 | import org.perfectjpattern.core.extras.delegate.*; | |
27 | import org.slf4j.*; | |
28 | ||
29 | /** | |
30 | * Startup Main for the Delegate Pattern Example code | |
31 | * | |
32 | * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a> | |
33 | * @version $Revision: 1.0 $Date: Apr 5, 2008 10:11:17 PM $ | |
34 | */ | |
35 | //CHECKSTYLE:OFF | |
36 | public final | |
37 | class Example | |
38 | // CHECKSTYLE:ON | |
39 | { | |
40 | //------------------------------------------------------------------------ | |
41 | // public | |
42 | //------------------------------------------------------------------------ | |
43 | 1 |
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44 | main(String[] anArguments) | |
45 | { | |
46 | //--------------------------------------------------------------- | |
47 | // Arbitrary types that have a size awareness but do not | |
48 | // share a common interface, therefore it could not be possible | |
49 | // writing a reusable code to get their sizes in a single way. | |
50 | // In this case without using Delegates, different adapter | |
51 | // implementations would be required: | |
52 | // | |
53 | // * String.length() is a function | |
54 | // * StringBuilder.length() is another function | |
55 | // * List.size() is another function | |
56 | //--------------------------------------------------------------- | |
57 | 1 | String myString = "Remember String instances are immutable ..."; |
58 | 1 | theLogger.debug(myString); |
59 | 1 | theLogger.debug("String length is: '" + myString.length() + "'"); |
60 | ||
61 | 1 | StringBuilder myBuilder = new StringBuilder(); |
62 | 1 | myBuilder.append("StringBuilder on the other hand"); |
63 | 1 | myBuilder.append("are not immutable"); |
64 | 1 | theLogger.debug(myBuilder.toString()); |
65 | 1 | theLogger.debug("Builder length is: '" + myBuilder.length() + "'"); |
66 | ||
67 | 1 | List<Integer> myList = new ArrayList<Integer>(); |
68 | 1 | myList.add(Integer.valueOf(0)); |
69 | 1 | myList.add(Integer.valueOf(1)); |
70 | 1 | myList.add(Integer.valueOf(2)); |
71 | 1 | myList.add(Integer.valueOf(3)); |
72 | 1 | myList.add(Integer.valueOf(4)); |
73 | 1 | theLogger.debug(Arrays.deepToString(myList.toArray())); |
74 | 1 | theLogger.debug("List size is: '" + myList.size() + "'"); |
75 | ||
76 | //--------------------------------------------------------------- | |
77 | // Create a delegate that unifies the interface view of all different | |
78 | // non-matching types and method signatures | |
79 | //--------------------------------------------------------------- | |
80 | 1 | IDelegator<ISizeAware> myDelegator = new Delegator<ISizeAware>( |
81 | ISizeAware.class); | |
82 | ||
83 | //--------------------------------------------------------------- | |
84 | // Create the delegates i.e. "function pointers" | |
85 | //--------------------------------------------------------------- | |
86 | 1 | List<ISizeAware> mySizeAwares = new ArrayList<ISizeAware>(); |
87 | 1 | mySizeAwares.add(myDelegator.build(myString, "length")); |
88 | 1 | mySizeAwares.add(myDelegator.build(myBuilder, "length")); |
89 | 1 | mySizeAwares.add(myDelegator.build(myList, "size")); |
90 | ||
91 | //--------------------------------------------------------------- | |
92 | // Use the delegates | |
93 | //--------------------------------------------------------------- | |
94 | 1 | for (ISizeAware mySizeAware : mySizeAwares) |
95 | { | |
96 | 3 | theLogger.debug(String.valueOf(mySizeAware.getSize())); |
97 | } | |
98 | } | |
99 | ||
100 | //------------------------------------------------------------------------ | |
101 | // protected | |
102 | //------------------------------------------------------------------------ | |
103 | 1 |
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104 | setLogger(Logger aLogger) | |
105 | { | |
106 | 1 | theLogger = aLogger; |
107 | } | |
108 | ||
109 | //------------------------------------------------------------------------ | |
110 | // members | |
111 | //------------------------------------------------------------------------ | |
112 | /** | |
113 | * Provides logging facilities for this class | |
114 | */ | |
115 | private static Logger theLogger = LoggerFactory.getLogger(Example.class); | |
116 | } |
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