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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/StalenessObservableValue.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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6208d4f6a277 Added trees for databinding.beans and observable
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1 /*******************************************************************************
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2 * Copyright (c) 2007, 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 * Boris Bokowski, IBM Corporation - initial API and implementation
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10 * Matthew Hall - bug 212468
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11 *******************************************************************************/
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12 package org.eclipse.core.internal.databinding.observable;
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13
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14 import org.eclipse.core.databinding.observable.ChangeEvent;
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15 import org.eclipse.core.databinding.observable.Diffs;
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16 import org.eclipse.core.databinding.observable.IChangeListener;
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17 import org.eclipse.core.databinding.observable.IObservable;
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18 import org.eclipse.core.databinding.observable.IStaleListener;
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19 import org.eclipse.core.databinding.observable.StaleEvent;
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20 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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21
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22 /**
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23 * An observable value that tracks the staleness of an {@link IObservable}.
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24 *
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25 * @since 1.1
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26 */
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27 public class StalenessObservableValue : AbstractObservableValue {
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28
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29 private class MyListener : IChangeListener, IStaleListener {
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30 public void handleChange(ChangeEvent event) {
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31 if (stale && !event.getObservable().isStale()) {
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32 stale = false;
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33 fireValueChange(Diffs.createValueDiff(Boolean.TRUE,
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34 Boolean.FALSE));
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35 }
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36 }
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37
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38 public void handleStale(StaleEvent staleEvent) {
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39 if (!stale) {
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40 stale = true;
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41 fireValueChange(Diffs.createValueDiff(Boolean.FALSE,
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42 Boolean.TRUE));
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43 }
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44 }
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45 }
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46
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47 private IObservable tracked;
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48 private bool stale;
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49 private MyListener listener = new MyListener();
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50
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51 /**
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52 * Constructs a StalenessObservableValue that tracks the staleness of the
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53 * given {@link IObservable}.
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54 *
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55 * @param observable
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56 * the observable to track
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57 */
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58 public this(IObservable observable) {
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59 super(observable.getRealm());
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60 this.tracked = observable;
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61 this.stale = observable.isStale();
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62 tracked.addChangeListener(listener);
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63 tracked.addStaleListener(listener);
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64 }
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65
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66 protected Object doGetValue() {
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67 return tracked.isStale() ? Boolean.TRUE : Boolean.FALSE;
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68 }
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69
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70 public Object getValueType() {
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71 return Boolean.TYPE;
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72 }
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73
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74 public synchronized void dispose() {
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75 if (tracked !is null) {
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76 tracked.removeChangeListener(listener);
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77 tracked.removeStaleListener(listener);
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78 tracked = null;
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79 listener = null;
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80 }
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81 super.dispose();
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82 }
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83
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84 }