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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2008 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 * Matthew Hall - bug 208332
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11 *******************************************************************************/
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12
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13 module org.eclipse.core.internal.databinding.observable.ProxyObservableSet;
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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.Collections;
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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.IStaleListener;
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21 import org.eclipse.core.databinding.observable.StaleEvent;
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22 import org.eclipse.core.databinding.observable.set.AbstractObservableSet;
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23 import org.eclipse.core.databinding.observable.set.IObservableSet;
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24 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
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25 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
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26
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27 /**
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28 * Wraps an observable set. This object acts like an exact copy of the original
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29 * set, and tracks all the changes in the original. The only difference is that
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30 * disposing the wrapper will not dispose the original. You can use this
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31 * whenever you need to return an IObservableSet from a method that expects the
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32 * caller to dispose the set, but you have an IObservableSet that you don't want
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33 * disposed.
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34 */
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35 public class ProxyObservableSet : AbstractObservableSet {
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36 private IObservableSet wrappedSet;
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37 private Object elementType;
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38
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39 private ISetChangeListener setChangeListener = new class() ISetChangeListener {
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40 public void handleSetChange(SetChangeEvent event) {
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41 fireSetChange(event.diff);
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42 }
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43 };
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44
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45 private IStaleListener staleListener = new class() IStaleListener {
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46 public void handleStale(StaleEvent staleEvent) {
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47 fireStale();
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48 }
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49 };
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50
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51 /**
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52 * Constructs a ProxyObservableSet that tracks the state of the given set.
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53 *
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54 * @param wrappedSet
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55 * the set being wrapped
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56 */
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57 public this(IObservableSet wrappedSet) {
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58 super(wrappedSet.getRealm());
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59 this.wrappedSet = wrappedSet;
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60 this.elementType = wrappedSet.getElementType();
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61 wrappedSet.addSetChangeListener(setChangeListener);
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62 wrappedSet.addStaleListener(staleListener);
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63 }
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64
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65 protected Set getWrappedSet() {
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66 return wrappedSet is null ? Collections.EMPTY_SET : wrappedSet;
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67 }
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68
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69 public Object getElementType() {
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70 return elementType;
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71 }
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72
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73 public bool isStale() {
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74 getterCalled();
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75 return wrappedSet is null ? false : wrappedSet.isStale();
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76 }
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77
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78 public void dispose() {
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79 if (wrappedSet !is null) {
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80 wrappedSet.removeSetChangeListener(setChangeListener);
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81 setChangeListener = null;
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82 wrappedSet.removeStaleListener(staleListener);
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83 staleListener = null;
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84 wrappedSet = null;
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85 }
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86 elementType = null;
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87 super.dispose();
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88 }
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89 }
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