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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/MapEntryObservableValue.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) 2008 Marko Topolnik 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 * Marko Topolnik - initial API and implementation (bug 184830)
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10 * Matthew Hall - bug 184830
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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.Diffs;
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16 import org.eclipse.core.databinding.observable.IStaleListener;
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17 import org.eclipse.core.databinding.observable.ObservableTracker;
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18 import org.eclipse.core.databinding.observable.StaleEvent;
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19 import org.eclipse.core.databinding.observable.map.IMapChangeListener;
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20 import org.eclipse.core.databinding.observable.map.IObservableMap;
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21 import org.eclipse.core.databinding.observable.map.MapChangeEvent;
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22 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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23 import org.eclipse.core.databinding.observable.value.IObservableValue;
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24
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25 /**
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26 * An {@link IObservableValue} that tracks the value of an entry in an
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27 * {@link IObservableMap}, identified by the entry's key.
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28 *
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29 * @since 1.1
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30 */
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31 public class MapEntryObservableValue : AbstractObservableValue {
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32 private IObservableMap map;
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33 private Object key;
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34 private Object valueType;
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35
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36 private IMapChangeListener changeListener = new class() IMapChangeListener {
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37 public void handleMapChange(final MapChangeEvent event) {
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38 if (event.diff.getAddedKeys().contains(key)) {
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39 final Object newValue = event.diff.getNewValue(key);
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40 if (newValue !is null) {
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41 fireValueChange(Diffs.createValueDiff(null, newValue));
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42 }
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43 } else if (event.diff.getChangedKeys().contains(key)) {
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44 fireValueChange(Diffs.createValueDiff(event.diff
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45 .getOldValue(key), event.diff.getNewValue(key)));
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46 } else if (event.diff.getRemovedKeys().contains(key)) {
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47 final Object oldValue = event.diff.getOldValue(key);
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48 if (oldValue !is null) {
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49 fireValueChange(Diffs.createValueDiff(oldValue, null));
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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
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55 private IStaleListener staleListener = new class() IStaleListener {
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56 public void handleStale(StaleEvent staleEvent) {
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57 fireStale();
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58 }
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59 };
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60
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61 /**
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62 * Creates a map entry observable.
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63 *
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64 * @param map
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65 * the observable map whose entry will be tracked
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66 * @param key
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67 * the key identifying the entry whose value will be tracked
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68 * @param valueType
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69 * the type of the value
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70 */
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71 public this(IObservableMap map, Object key,
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72 Object valueType) {
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73 super(map.getRealm());
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74 this.map = map;
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75 this.key = key;
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76 this.valueType = valueType;
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77
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78 map.addMapChangeListener(changeListener);
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79 map.addStaleListener(staleListener);
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80 }
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81
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82 public Object getValueType() {
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83 return this.valueType;
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84 }
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85
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86 public bool isStale() {
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87 ObservableTracker.getterCalled(this);
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88 return map.isStale();
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89 }
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90
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91 public synchronized void dispose() {
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92 if (map !is null) {
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93 map.removeMapChangeListener(changeListener);
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94 map.removeStaleListener(staleListener);
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95 map = null;
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96 changeListener = null;
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97 staleListener = null;
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98 }
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99 super.dispose();
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100 }
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101
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102 protected Object doGetValue() {
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103 return this.map.get(this.key);
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104 }
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105
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106 protected void doSetValue(Object value) {
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107 this.map.put(this.key, value);
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108 }
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109 }