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comparison org.eclipse.core.databinding/src/org/eclipse/core/databinding/observable/set/ListToSetAdapter.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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children 383ce7bd736b
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2006, 2007 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 *******************************************************************************/
11
12 module org.eclipse.core.databinding.observable.set.ListToSetAdapter;
13
14 import java.lang.all;
15
16 import java.util.HashSet;
17 import java.util.Set;
18
19 import org.eclipse.core.databinding.observable.Diffs;
20 import org.eclipse.core.databinding.observable.Realm;
21 import org.eclipse.core.databinding.observable.list.IListChangeListener;
22 import org.eclipse.core.databinding.observable.list.IObservableList;
23 import org.eclipse.core.databinding.observable.list.ListChangeEvent;
24 import org.eclipse.core.databinding.observable.list.ListDiffEntry;
25
26 /**
27 * Observable set backed by an observable list. The wrapped list must not
28 * contain duplicate elements.
29 *
30 * <p>
31 * This class is thread safe. All state accessing methods must be invoked from
32 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
33 * listeners may be invoked from any thread.
34 * </p>
35 *
36 * @since 1.0
37 *
38 */
39 public class ListToSetAdapter : ObservableSet {
40
41 private final IObservableList list;
42
43 private IListChangeListener listener = new class() IListChangeListener {
44
45 public void handleListChange(ListChangeEvent event) {
46 Set added = new HashSet();
47 Set removed = new HashSet();
48 ListDiffEntry[] differences = event.diff.getDifferences();
49 for (int i = 0; i < differences.length; i++) {
50 ListDiffEntry entry = differences[i];
51 Object element = entry.getElement();
52 if (entry.isAddition()) {
53 if (wrappedSet.add(element)) {
54 if (!removed.remove(element))
55 added.add(element);
56 }
57 } else {
58 if (wrappedSet.remove(element)) {
59 removed.add(element);
60 added.remove(element);
61 }
62 }
63 }
64 fireSetChange(Diffs.createSetDiff(added, removed));
65 }
66 };
67
68 /**
69 * @param list
70 */
71 public this(IObservableList list) {
72 super(list.getRealm(), new HashSet(), list.getElementType());
73 this.list = list;
74 wrappedSet.addAll(list);
75 this.list.addListChangeListener(listener);
76 }
77
78 public synchronized void dispose() {
79 super.dispose();
80 if (list !is null && listener !is null) {
81 list.removeListChangeListener(listener);
82 listener = null;
83 }
84 }
85
86 }