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org.perfectjpattern.core.behavioral.observer.TestExample.testObserver
org.perfectjpattern.core.behavioral.observer.TestExample.testObserver
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1 PASS | |
| 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 |
@SuppressWarnings("unchecked") |
| 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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