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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/map/BidirectionalMap.d @ 96:b74ac5dfcc06

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package to module and java.lang.all import
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 11:03:33 +0200
parents 6208d4f6a277
children c86eb8b3098e
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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;
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12
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13 import java.lang.all;
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14
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15 import java.util.Collections;
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16 import java.util.HashMap;
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17 import java.util.HashSet;
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18 import java.util.Iterator;
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19 import java.util.Map;
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20 import java.util.Set;
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21
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22 import org.eclipse.core.databinding.observable.Realm;
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23
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24 /**
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25 *
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26 * <p>
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27 * This class is thread safe. All state accessing methods must be invoked from
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28 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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29 * listeners may be invoked from any thread.
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30 * </p>
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31 * @since 1.0
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32 *
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33 */
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34 public class BidirectionalMap : ObservableMap {
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35
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36 private Map valueToElements = new HashMap();
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37
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38 private IMapChangeListener mapListener = new class() IMapChangeListener {
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39
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40 public void handleMapChange(MapChangeEvent event) {
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41 MapDiff diff = event.diff;
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42 for (Iterator it = diff.getAddedKeys().iterator(); it.hasNext();) {
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43 Object addedKey = it.next();
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44 addMapping(addedKey, diff.getNewValue(addedKey));
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45 }
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46 for (Iterator it = diff.getChangedKeys().iterator(); it.hasNext();) {
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47 Object changedKey = it.next();
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48 removeMapping(changedKey, diff.getOldValue(changedKey));
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49 addMapping(changedKey, diff.getNewValue(changedKey));
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50 }
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51 for (Iterator it = diff.getRemovedKeys().iterator(); it.hasNext();) {
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52 Object removedKey = it.next();
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53 removeMapping(removedKey, diff.getOldValue(removedKey));
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54 }
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55 fireMapChange(diff);
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56 }
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57 };
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58
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59 /**
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60 * @param wrappedMap
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61 */
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62 public this(IObservableMap wrappedMap) {
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63 super(wrappedMap.getRealm(), wrappedMap);
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64 wrappedMap.addMapChangeListener(mapListener);
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65 for (Iterator it = wrappedMap.entrySet().iterator(); it.hasNext();) {
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66 Map.Entry entry = cast(Entry) it.next();
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67 addMapping(entry.getKey(), entry.getValue());
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68 }
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69 }
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70
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71 /**
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72 * @param key
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73 * @param value
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74 */
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75 private void addMapping(Object key, Object value) {
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76 Object elementOrSet = valueToElements.get(value);
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77 if (elementOrSet is null) {
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78 valueToElements.put(value, key);
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79 return;
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80 }
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81 if (!( null !is cast(Set)elementOrSet )) {
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82 elementOrSet = new HashSet(Collections.singleton(elementOrSet));
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83 valueToElements.put(value, elementOrSet);
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84 }
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85 Set set = cast(Set) elementOrSet;
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86 set.add(key);
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87 }
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88
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89 /**
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90 * @param functionValue
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91 * @param element
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92 */
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93 private void removeMapping(Object functionValue, Object element) {
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94 Object elementOrSet = valueToElements.get(functionValue);
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95 if ( null !is cast(Set)elementOrSet ) {
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96 Set set = cast(Set) elementOrSet;
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97 set.remove(element);
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98 if (set.size() is 0) {
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99 valueToElements.remove(functionValue);
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100 }
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101 } else {
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102 valueToElements.remove(functionValue);
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103 }
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104 }
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105
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106 }