Mercurial > projects > dwt2
annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/map/BidirectionalMap.d @ 97:c86eb8b3098e
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author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:18:25 +0200 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2006, 2007 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 *******************************************************************************/ |
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11 module org.eclipse.core.databinding.observable.map.BidirectionalMap; |
97 | 12 import org.eclipse.core.databinding.observable.map.MapDiff; |
13 import org.eclipse.core.databinding.observable.map.ObservableMap; | |
14 import org.eclipse.core.databinding.observable.map.MapChangeEvent; | |
15 import org.eclipse.core.databinding.observable.map.IMapChangeListener; | |
16 import org.eclipse.core.databinding.observable.map.IObservableMap; | |
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17 |
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18 import java.lang.all; |
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19 |
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20 import java.util.Collections; |
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21 import java.util.HashMap; |
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22 import java.util.HashSet; |
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23 import java.util.Iterator; |
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24 import java.util.Map; |
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25 import java.util.Set; |
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26 |
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27 import org.eclipse.core.databinding.observable.Realm; |
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28 |
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29 /** |
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30 * |
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31 * <p> |
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32 * This class is thread safe. All state accessing methods must be invoked from |
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33 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing |
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34 * listeners may be invoked from any thread. |
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35 * </p> |
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36 * @since 1.0 |
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37 * |
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38 */ |
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39 public class BidirectionalMap : ObservableMap { |
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40 |
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41 private Map valueToElements = new HashMap(); |
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42 |
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43 private IMapChangeListener mapListener = new class() IMapChangeListener { |
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44 |
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45 public void handleMapChange(MapChangeEvent event) { |
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46 MapDiff diff = event.diff; |
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47 for (Iterator it = diff.getAddedKeys().iterator(); it.hasNext();) { |
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48 Object addedKey = it.next(); |
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49 addMapping(addedKey, diff.getNewValue(addedKey)); |
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50 } |
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51 for (Iterator it = diff.getChangedKeys().iterator(); it.hasNext();) { |
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52 Object changedKey = it.next(); |
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53 removeMapping(changedKey, diff.getOldValue(changedKey)); |
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54 addMapping(changedKey, diff.getNewValue(changedKey)); |
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55 } |
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56 for (Iterator it = diff.getRemovedKeys().iterator(); it.hasNext();) { |
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57 Object removedKey = it.next(); |
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58 removeMapping(removedKey, diff.getOldValue(removedKey)); |
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59 } |
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60 fireMapChange(diff); |
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61 } |
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62 }; |
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63 |
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64 /** |
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65 * @param wrappedMap |
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66 */ |
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67 public this(IObservableMap wrappedMap) { |
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68 super(wrappedMap.getRealm(), wrappedMap); |
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69 wrappedMap.addMapChangeListener(mapListener); |
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70 for (Iterator it = wrappedMap.entrySet().iterator(); it.hasNext();) { |
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71 Map.Entry entry = cast(Entry) it.next(); |
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72 addMapping(entry.getKey(), entry.getValue()); |
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73 } |
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74 } |
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75 |
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76 /** |
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77 * @param key |
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78 * @param value |
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79 */ |
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80 private void addMapping(Object key, Object value) { |
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81 Object elementOrSet = valueToElements.get(value); |
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82 if (elementOrSet is null) { |
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83 valueToElements.put(value, key); |
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84 return; |
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85 } |
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86 if (!( null !is cast(Set)elementOrSet )) { |
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87 elementOrSet = new HashSet(Collections.singleton(elementOrSet)); |
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88 valueToElements.put(value, elementOrSet); |
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89 } |
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90 Set set = cast(Set) elementOrSet; |
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91 set.add(key); |
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92 } |
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93 |
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94 /** |
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95 * @param functionValue |
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96 * @param element |
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97 */ |
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98 private void removeMapping(Object functionValue, Object element) { |
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99 Object elementOrSet = valueToElements.get(functionValue); |
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100 if ( null !is cast(Set)elementOrSet ) { |
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101 Set set = cast(Set) elementOrSet; |
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102 set.remove(element); |
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103 if (set.size() is 0) { |
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104 valueToElements.remove(functionValue); |
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105 } |
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106 } else { |
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107 valueToElements.remove(functionValue); |
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108 } |
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109 } |
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110 |
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111 } |