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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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81
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12 import org.eclipse.core.databinding.observable.map.MapDiff;
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13 import org.eclipse.core.databinding.observable.map.ObservableMap;
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14 import org.eclipse.core.databinding.observable.map.MapChangeEvent;
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15 import org.eclipse.core.databinding.observable.map.IMapChangeListener;
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16 import org.eclipse.core.databinding.observable.map.IObservableMap;
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78
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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 }
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