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comparison org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/observable/ProxyObservableSet.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2006, 2008 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Matthew Hall - bug 208332
11 *******************************************************************************/
12
13 module org.eclipse.core.internal.databinding.observable.ProxyObservableSet;
14
15 import java.lang.all;
16
17 import java.util.Collections;
18 import java.util.Set;
19
20 import org.eclipse.core.databinding.observable.IStaleListener;
21 import org.eclipse.core.databinding.observable.StaleEvent;
22 import org.eclipse.core.databinding.observable.set.AbstractObservableSet;
23 import org.eclipse.core.databinding.observable.set.IObservableSet;
24 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
25 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
26
27 /**
28 * Wraps an observable set. This object acts like an exact copy of the original
29 * set, and tracks all the changes in the original. The only difference is that
30 * disposing the wrapper will not dispose the original. You can use this
31 * whenever you need to return an IObservableSet from a method that expects the
32 * caller to dispose the set, but you have an IObservableSet that you don't want
33 * disposed.
34 */
35 public class ProxyObservableSet : AbstractObservableSet {
36 private IObservableSet wrappedSet;
37 private Object elementType;
38
39 private ISetChangeListener setChangeListener = new class() ISetChangeListener {
40 public void handleSetChange(SetChangeEvent event) {
41 fireSetChange(event.diff);
42 }
43 };
44
45 private IStaleListener staleListener = new class() IStaleListener {
46 public void handleStale(StaleEvent staleEvent) {
47 fireStale();
48 }
49 };
50
51 /**
52 * Constructs a ProxyObservableSet that tracks the state of the given set.
53 *
54 * @param wrappedSet
55 * the set being wrapped
56 */
57 public this(IObservableSet wrappedSet) {
58 super(wrappedSet.getRealm());
59 this.wrappedSet = wrappedSet;
60 this.elementType = wrappedSet.getElementType();
61 wrappedSet.addSetChangeListener(setChangeListener);
62 wrappedSet.addStaleListener(staleListener);
63 }
64
65 protected Set getWrappedSet() {
66 return wrappedSet is null ? Collections.EMPTY_SET : wrappedSet;
67 }
68
69 public Object getElementType() {
70 return elementType;
71 }
72
73 public bool isStale() {
74 getterCalled();
75 return wrappedSet is null ? false : wrappedSet.isStale();
76 }
77
78 public void dispose() {
79 if (wrappedSet !is null) {
80 wrappedSet.removeSetChangeListener(setChangeListener);
81 setChangeListener = null;
82 wrappedSet.removeStaleListener(staleListener);
83 staleListener = null;
84 wrappedSet = null;
85 }
86 elementType = null;
87 super.dispose();
88 }
89 }