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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 module org.eclipse.core.internal.databinding.observable.MapEntryObservableValue;
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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 org.eclipse.core.databinding.observable.Diffs;
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18 import org.eclipse.core.databinding.observable.IStaleListener;
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19 import org.eclipse.core.databinding.observable.ObservableTracker;
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20 import org.eclipse.core.databinding.observable.StaleEvent;
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21 import org.eclipse.core.databinding.observable.map.IMapChangeListener;
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22 import org.eclipse.core.databinding.observable.map.IObservableMap;
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23 import org.eclipse.core.databinding.observable.map.MapChangeEvent;
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24 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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25 import org.eclipse.core.databinding.observable.value.IObservableValue;
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26
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27 /**
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28 * An {@link IObservableValue} that tracks the value of an entry in an
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29 * {@link IObservableMap}, identified by the entry's key.
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30 *
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31 * @since 1.1
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32 */
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33 public class MapEntryObservableValue : AbstractObservableValue {
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34 private IObservableMap map;
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35 private Object key;
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36 private Object valueType;
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37
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38 private IMapChangeListener changeListener = new class() IMapChangeListener {
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39 public void handleMapChange(MapChangeEvent event) {
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40 if (event.diff.getAddedKeys().contains(key)) {
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41 final Object newValue = event.diff.getNewValue(key);
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42 if (newValue !is null) {
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43 fireValueChange(Diffs.createValueDiff(null, newValue));
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44 }
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45 } else if (event.diff.getChangedKeys().contains(key)) {
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46 fireValueChange(Diffs.createValueDiff(event.diff
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47 .getOldValue(key), event.diff.getNewValue(key)));
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48 } else if (event.diff.getRemovedKeys().contains(key)) {
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49 final Object oldValue = event.diff.getOldValue(key);
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50 if (oldValue !is null) {
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51 fireValueChange(Diffs.createValueDiff(oldValue, null));
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52 }
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53 }
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54 }
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55 };
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56
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57 private IStaleListener staleListener = new class() IStaleListener {
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58 public void handleStale(StaleEvent staleEvent) {
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59 fireStale();
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60 }
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61 };
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62
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63 /**
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64 * Creates a map entry observable.
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65 *
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66 * @param map
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67 * the observable map whose entry will be tracked
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68 * @param key
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69 * the key identifying the entry whose value will be tracked
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70 * @param valueType
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71 * the type of the value
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72 */
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73 public this(IObservableMap map, Object key,
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74 Object valueType) {
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75 super(map.getRealm());
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76 this.map = map;
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77 this.key = key;
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78 this.valueType = valueType;
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79
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80 map.addMapChangeListener(changeListener);
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81 map.addStaleListener(staleListener);
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82 }
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83
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84 public Object getValueType() {
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85 return this.valueType;
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86 }
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87
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88 public bool isStale() {
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89 ObservableTracker.getterCalled(this);
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90 return map.isStale();
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91 }
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92
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93 public synchronized void dispose() {
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94 if (map !is null) {
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95 map.removeMapChangeListener(changeListener);
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96 map.removeStaleListener(staleListener);
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97 map = null;
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98 changeListener = null;
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99 staleListener = null;
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100 }
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101 super.dispose();
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102 }
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103
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104 protected Object doGetValue() {
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105 return this.map.get(this.key);
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106 }
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107
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108 protected void doSetValue(Object value) {
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109 this.map.put(this.key, value);
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110 }
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111 }
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