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comparison org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/UnmodifiableObservableSet.d @ 95:6208d4f6a277

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Added trees for databinding.beans and observable
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 10:55:51 +0200
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children b74ac5dfcc06
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94:1d37a7813832 95:6208d4f6a277
1 /*******************************************************************************
2 * Copyright (c) 2007 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 208332)
10 * Brad Reynolds - initial API and implementation
11 * (through UnmodifiableObservableList.java)
12 ******************************************************************************/
13
14 package org.eclipse.core.internal.databinding.observable;
15
16 import org.eclipse.core.databinding.observable.IStaleListener;
17 import org.eclipse.core.databinding.observable.StaleEvent;
18 import org.eclipse.core.databinding.observable.set.*;
19
20 /**
21 * ObservableList implementation that prevents modification by consumers. Events
22 * in the originating wrapped list are propagated and thrown from this instance
23 * when appropriate. All mutators throw an UnsupportedOperationException.
24 *
25 * @since 1.1
26 */
27 public class UnmodifiableObservableSet : ObservableSet {
28 private ISetChangeListener setChangeListener = new class() ISetChangeListener {
29 public void handleSetChange(SetChangeEvent event) {
30 fireSetChange(event.diff);
31 }
32 };
33
34 private IStaleListener staleListener = new class() IStaleListener {
35 public void handleStale(StaleEvent event) {
36 fireStale();
37 }
38 };
39
40 private IObservableSet wrappedSet;
41
42 /**
43 * @param wrappedSet
44 */
45 public this(IObservableSet wrappedSet) {
46 super(wrappedSet.getRealm(), wrappedSet, wrappedSet.getElementType());
47
48 this.wrappedSet = wrappedSet;
49
50 wrappedSet.addSetChangeListener(setChangeListener);
51 wrappedSet.addStaleListener(staleListener);
52 }
53
54 /**
55 * Because this instance is immutable staleness cannot be changed.
56 */
57 public void setStale(bool stale) {
58 throw new UnsupportedOperationException();
59 }
60
61 public bool isStale() {
62 getterCalled();
63 return wrappedSet is null ? false : wrappedSet.isStale();
64 }
65
66 public synchronized void dispose() {
67 if (wrappedSet !is null) {
68 wrappedSet.removeSetChangeListener(setChangeListener);
69 wrappedSet.removeStaleListener(staleListener);
70 wrappedSet = null;
71 }
72 setChangeListener = null;
73 staleListener = null;
74 super.dispose();
75 }
76 }