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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/UnmodifiableObservableList.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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1 /*******************************************************************************
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2 * Copyright (c) 2006-2008 Cerner 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 * Brad Reynolds - initial API and implementation
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10 * Matthew Hall - bug 208332
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11 ******************************************************************************/
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12
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13 package org.eclipse.core.internal.databinding.observable;
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14
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15 import org.eclipse.core.databinding.observable.IStaleListener;
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16 import org.eclipse.core.databinding.observable.StaleEvent;
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17 import org.eclipse.core.databinding.observable.list.IListChangeListener;
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18 import org.eclipse.core.databinding.observable.list.IObservableList;
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19 import org.eclipse.core.databinding.observable.list.ListChangeEvent;
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20 import org.eclipse.core.databinding.observable.list.ObservableList;
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21
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22 /**
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23 * ObservableList implementation that prevents modification by consumers. Events
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24 * in the originating wrapped list are propagated and thrown from this instance
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25 * when appropriate. All mutators throw an UnsupportedOperationException.
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26 *
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27 * @since 1.0
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28 */
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29 /*
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30 * Implementation makes the assumption that the superclass cast(ObservableList) is
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31 * unmodifiable and that all modify methods throw an
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32 * UnsupportedOperationException.
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33 */
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34 public class UnmodifiableObservableList : ObservableList {
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35 /**
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36 * List that is being made unmodifiable.
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37 */
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38 private IObservableList wrappedList;
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39
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40 private IListChangeListener listChangeListener = new class() IListChangeListener {
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41 public void handleListChange(ListChangeEvent event) {
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42 // Fires a Change and then ListChange event.
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43 fireListChange(event.diff);
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44 }
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45 };
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46
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47 private IStaleListener staleListener = new class() IStaleListener {
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48 public void handleStale(StaleEvent event) {
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49 fireStale();
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50 }
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51 };
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52
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53 /**
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54 * @param wrappedList
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55 */
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56 public this(IObservableList wrappedList) {
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57 super(wrappedList.getRealm(), wrappedList, wrappedList.getElementType());
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58 this.wrappedList = wrappedList;
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59
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60 wrappedList.addListChangeListener(listChangeListener);
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61
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62 wrappedList.addStaleListener(staleListener);
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63 }
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64
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65 /**
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66 * Because this instance is immutable staleness cannot be changed.
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67 *
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68 * @throws UnsupportedOperationException
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69 * because this instance is unmodifiable.
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70 */
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71 public void setStale(bool stale) {
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72 throw new UnsupportedOperationException();
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73 }
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74
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75 public bool isStale() {
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76 getterCalled();
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77 return wrappedList is null ? false : wrappedList.isStale();
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78 }
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79
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80 public synchronized void dispose() {
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81 if (wrappedList !is null) {
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82 wrappedList.removeListChangeListener(listChangeListener);
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83 wrappedList.removeStaleListener(staleListener);
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84 wrappedList = null;
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85 }
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86 listChangeListener = null;
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87 staleListener = null;
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88 super.dispose();
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89 }
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90 }