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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11
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12 module org.eclipse.core.databinding.observable.set.ListToSetAdapter;
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81
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13 import org.eclipse.core.databinding.observable.set.ObservableSet;
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78
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14
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15 import java.lang.all;
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16
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17 import java.util.HashSet;
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18 import java.util.Set;
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19
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20 import org.eclipse.core.databinding.observable.Diffs;
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21 import org.eclipse.core.databinding.observable.Realm;
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22 import org.eclipse.core.databinding.observable.list.IListChangeListener;
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23 import org.eclipse.core.databinding.observable.list.IObservableList;
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24 import org.eclipse.core.databinding.observable.list.ListChangeEvent;
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25 import org.eclipse.core.databinding.observable.list.ListDiffEntry;
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26
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27 /**
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28 * Observable set backed by an observable list. The wrapped list must not
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29 * contain duplicate elements.
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30 *
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31 * <p>
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32 * This class is thread safe. All state accessing methods must be invoked from
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33 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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34 * listeners may be invoked from any thread.
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35 * </p>
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36 *
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37 * @since 1.0
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38 *
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39 */
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40 public class ListToSetAdapter : ObservableSet {
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41
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42 private final IObservableList list;
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43
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85
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44 private IListChangeListener listener;
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45 class Listener_ : IListChangeListener {
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46
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47 public void handleListChange(ListChangeEvent event) {
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48 Set added = new HashSet();
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49 Set removed = new HashSet();
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50 ListDiffEntry[] differences = event.diff.getDifferences();
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51 for (int i = 0; i < differences.length; i++) {
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52 ListDiffEntry entry = differences[i];
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53 Object element = entry.getElement();
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54 if (entry.isAddition()) {
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55 if (wrappedSet.add(element)) {
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56 if (!removed.remove(element))
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57 added.add(element);
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58 }
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59 } else {
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60 if (wrappedSet.remove(element)) {
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61 removed.add(element);
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62 added.remove(element);
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63 }
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64 }
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65 }
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66 fireSetChange(Diffs.createSetDiff(added, removed));
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67 }
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68 };
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69
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70 /**
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71 * @param list
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72 */
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73 public this(IObservableList list) {
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85
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74 listener = new Listener_();
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75 super(list.getRealm(), new HashSet(), list.getElementType());
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76 this.list = list;
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77 wrappedSet.addAll(list);
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78 this.list.addListChangeListener(listener);
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79 }
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80
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81 public synchronized void dispose() {
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82 super.dispose();
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83 if (list !is null && listener !is null) {
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84 list.removeListChangeListener(listener);
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85 listener = null;
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86 }
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87 }
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88
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89 }
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