| Classes in this File | Line Coverage | Branch Coverage | Complexity | |||||||
| EOObserverProxy |
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| 1.25;1.25 |
| 1 | /* |
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| 2 | Wotonomy: OpenStep design patterns for pure Java applications. |
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| 3 | Copyright (C) 2001 Intersect Software Corporation |
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| 4 | ||
| 5 | This library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | ||
| 10 | This library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with this library; if not, see http://www.gnu.org |
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| 17 | */ |
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| 18 | ||
| 19 | package net.wotonomy.control; |
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| 20 | ||
| 21 | import net.wotonomy.foundation.NSSelector; |
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| 22 | ||
| 23 | /** |
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| 24 | * A convenience observer for objects that do not or cannot |
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| 25 | * subclass EODelayedObserver. EOObserverProxy will invoke |
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| 26 | * an NSSelector on an object when it receives a subjectChanged |
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| 27 | * message. |
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| 28 | * |
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| 29 | * @author michael@mpowers.net |
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| 30 | * @author $Author: cgruber $ |
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| 31 | * @version $Revision: 893 $ |
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| 32 | */ |
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| 33 | public class EOObserverProxy |
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| 34 | extends EODelayedObserver |
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| 35 | { |
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| 36 | protected Object target; |
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| 37 | protected NSSelector selector; |
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| 38 | protected int priority; |
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| 39 | ||
| 40 | /** |
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| 41 | * Constructs an EODelayedObserver that will invoke the specified selector |
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| 42 | * on the specified object, and will run at the specified priority. |
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| 43 | */ |
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| 44 | 0 | public EOObserverProxy ( |
| 45 | Object anObject, NSSelector aSelector, int aPriority ) |
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| 46 | 0 | { |
| 47 | 0 | target = anObject; |
| 48 | 0 | selector = aSelector; |
| 49 | 0 | priority = aPriority; |
| 50 | 0 | } |
| 51 | ||
| 52 | /** |
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| 53 | * Constructs an EODelayedObserver that will invoke the specified selector |
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| 54 | * on the specified object, and will run at ObserverPriorityThird priority, |
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| 55 | * which is the default. |
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| 56 | */ |
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| 57 | public EOObserverProxy ( |
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| 58 | Object anObject, NSSelector aSelector ) |
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| 59 | { |
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| 60 | 0 | this( anObject, aSelector, ObserverPriorityThird ); |
| 61 | 0 | } |
| 62 | ||
| 63 | /** |
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| 64 | * Returns the priority of this observer in the queue. |
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| 65 | * This implementation returns the priority specified |
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| 66 | * in the constructor. |
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| 67 | */ |
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| 68 | public int priority () |
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| 69 | { |
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| 70 | 0 | return priority; |
| 71 | } |
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| 72 | ||
| 73 | /** |
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| 74 | * Notifies observer that one or more objects that |
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| 75 | * it is observing have changed. The observer should |
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| 76 | * check all objects it is observing for changes. |
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| 77 | */ |
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| 78 | public void subjectChanged () |
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| 79 | { |
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| 80 | try |
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| 81 | { |
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| 82 | 0 | selector.invoke( target ); |
| 83 | } |
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| 84 | 0 | catch ( Exception exc ) |
| 85 | { |
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| 86 | 0 | System.out.println( "Error notifying observer: " ); |
| 87 | 0 | exc.printStackTrace(); |
| 88 | 0 | } |
| 89 | 0 | } |
| 90 | ||
| 91 | } |
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| 92 | ||
| 93 | /* |
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| 94 | * $Log$ |
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| 95 | * Revision 1.1 2006/02/16 13:19:57 cgruber |
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| 96 | * Check in all sources in eclipse-friendly maven-enabled packages. |
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| 97 | * |
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| 98 | * Revision 1.1 2001/10/22 21:55:32 mpowers |
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| 99 | * This turns out to be a really useful class. |
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| 100 | * |
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| 101 | * |
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| 102 | */ |
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| 103 | ||
| 104 |