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org.perfectjpattern.core.behavioral.observer.TestExample.testObserver
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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.observer; | |
22 | ||
23 | import java.text.*; | |
24 | import java.util.*; | |
25 | ||
26 | import org.perfectjpattern.core.api.behavioral.observer.*; | |
27 | ||
28 | /** | |
29 | * Startup Main for the Observer Pattern Example code | |
30 | * | |
31 | * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a> | |
32 | * @version $Revision: 1.0 $Date: Apr 5, 2008 10:11:17 PM $ | |
33 | */ | |
34 | //CHECKSTYLE:OFF | |
35 | public final | |
36 | class Example | |
37 | // CHECKSTYLE:ON | |
38 | { | |
39 | //------------------------------------------------------------------------ | |
40 | // public | |
41 | //------------------------------------------------------------------------ | |
42 | 1 |
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43 | public static void | |
44 | main(String[] anArguments) | |
45 | throws ParseException | |
46 | { | |
47 | //--------------------------------------------------------------- | |
48 | // Create Clock Timer subject | |
49 | //--------------------------------------------------------------- | |
50 | 1 | ISubject<Date> myClockTimer = new Subject<Date>(); |
51 | ||
52 | //--------------------------------------------------------------- | |
53 | // Create and attach concrete observers | |
54 | //--------------------------------------------------------------- | |
55 | 1 | IClock myAnalog = new AnalogClock(); |
56 | 1 | myClockTimer.attach(myAnalog, new DigitalClock()); |
57 | ||
58 | //--------------------------------------------------------------- | |
59 | // AntiqueClock demonstrates the use of ObserverProxy for cases | |
60 | // where the Observer handling source code is not accessible and | |
61 | // thus can not be abstract coupled to PerfectJPattern's Observer | |
62 | // In this case we have AntiqueClock that does not implement | |
63 | // IObserver and has a "displayTime" static method | |
64 | //--------------------------------------------------------------- | |
65 | 1 | IObserver<Date> myAntiqueClock = new ObserverProxy<Date>( |
66 | AntiqueClock.class, "displayTime", Date.class); | |
67 | 1 | myClockTimer.attach(myAntiqueClock); |
68 | ||
69 | //--------------------------------------------------------------- | |
70 | // Notify observers but make sure the date is predictable, this is | |
71 | // good for testability | |
72 | //--------------------------------------------------------------- | |
73 | 1 | Date myFirstDate = DATE_FORMAT.parse("14.09.1975 08:00:00"); |
74 | 1 | myClockTimer.notifyObservers(myFirstDate); |
75 | ||
76 | //--------------------------------------------------------------- | |
77 | // Optionally detach observers | |
78 | //--------------------------------------------------------------- | |
79 | 1 | myClockTimer.detach(myAnalog); |
80 | ||
81 | //--------------------------------------------------------------- | |
82 | // Notify observers | |
83 | //--------------------------------------------------------------- | |
84 | 1 | Date mySecondDate = DATE_FORMAT.parse("25.05.2008 15:56:00"); |
85 | 1 | myClockTimer.notifyObservers(mySecondDate); |
86 | } | |
87 | ||
88 | //------------------------------------------------------------------------ | |
89 | // members | |
90 | //------------------------------------------------------------------------ | |
91 | private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat( | |
92 | "dd.MM.yyyy HH:mm:ss"); | |
93 | } |
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