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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/MapEntryObservableValue.d @ 96:b74ac5dfcc06
package to module and java.lang.all import
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:03:33 +0200 |
parents | 6208d4f6a277 |
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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 |
96
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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(final 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 } |