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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/set/MappedSet.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
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12 module org.eclipse.core.databinding.observable.set.MappedSet;
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13
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14 import java.lang.all;
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15
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16 import java.util.Collections;
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17 import java.util.HashMap;
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18 import java.util.HashSet;
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19 import java.util.Iterator;
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20 import java.util.Map;
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21 import java.util.Set;
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22
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23 import org.eclipse.core.databinding.observable.Diffs;
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24 import org.eclipse.core.databinding.observable.Realm;
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25 import org.eclipse.core.databinding.observable.map.IMapChangeListener;
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26 import org.eclipse.core.databinding.observable.map.IObservableMap;
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27 import org.eclipse.core.databinding.observable.map.MapChangeEvent;
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28 import org.eclipse.core.databinding.observable.map.MapDiff;
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29
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30 /**
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31 *
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32 * <p>
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33 * This class is thread safe. All state accessing methods must be invoked from
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34 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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35 * listeners may be invoked from any thread.
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36 * </p>
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37 *
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38 * @since 1.0
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39 *
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40 */
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41 public class MappedSet : ObservableSet {
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42
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43 private final IObservableMap wrappedMap;
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44
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45 /*
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46 * Map from values (range elements) to Integer ref counts
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47 */
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48 private Map valueCounts = new HashMap();
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49
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50 private ISetChangeListener domainListener = new class() ISetChangeListener {
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51 public void handleSetChange(SetChangeEvent event) {
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52 Set additions = new HashSet();
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53 for (Iterator it = event.diff.getAdditions().iterator(); it.hasNext();) {
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54 Object added = it.next();
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55 Object mapValue = wrappedMap.get(added);
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56 if (handleAddition(mapValue)) {
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57 additions.add(mapValue);
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58 }
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59 }
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60 Set removals = new HashSet();
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61 for (Iterator it = event.diff.getRemovals().iterator(); it.hasNext();) {
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62 Object removed = it.next();
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63 Object mapValue = wrappedMap.get(removed);
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64 if (handleRemoval(mapValue)) {
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65 removals.add(mapValue);
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66 }
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67 }
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68 fireSetChange(Diffs.createSetDiff(additions, removals));
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69 }
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70 };
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71
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72 private IMapChangeListener mapChangeListener = new class() IMapChangeListener {
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73 public void handleMapChange(MapChangeEvent event) {
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74 MapDiff diff = event.diff;
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75 Set additions = new HashSet();
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76 Set removals = new HashSet();
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77 for (Iterator it = diff.getRemovedKeys().iterator(); it.hasNext();) {
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78 Object key = it.next();
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79 Object oldValue = diff.getOldValue(key);
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80 if (handleRemoval(oldValue)) {
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81 removals.add(oldValue);
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82 }
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83 }
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84 for (Iterator it = diff.getChangedKeys().iterator(); it.hasNext();) {
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85 Object key = it.next();
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86 Object oldValue = diff.getOldValue(key);
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87 Object newValue = diff.getNewValue(key);
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88 if (handleRemoval(oldValue)) {
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89 removals.add(oldValue);
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90 }
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91 if (handleAddition(newValue)) {
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92 additions.add(newValue);
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93 }
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94 }
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95 for (Iterator it = diff.getAddedKeys().iterator(); it.hasNext();) {
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96 Object key = it.next();
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97 Object newValue = diff.getNewValue(key);
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98 if (handleAddition(newValue)) {
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99 additions.add(newValue);
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100 }
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101 }
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102 fireSetChange(Diffs.createSetDiff(additions, removals));
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103 }
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104 };
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105
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106 private IObservableSet input;
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107
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108 /**
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109 * @param input
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110 * @param map
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111 */
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112 public this(IObservableSet input, IObservableMap map) {
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113 super(input.getRealm(), Collections.EMPTY_SET, Object.class);
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114 setWrappedSet(valueCounts.keySet());
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115 this.wrappedMap = map;
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116 this.input = input;
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117 for (Iterator it = input.iterator(); it.hasNext();) {
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118 Object element = it.next();
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119 Object functionValue = wrappedMap.get(element);
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120 handleAddition(functionValue);
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121 }
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122 input.addSetChangeListener(domainListener);
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123 map.addMapChangeListener(mapChangeListener);
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124 }
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125
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126 /**
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127 * @param mapValue
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128 * @return true if the given mapValue was an addition
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129 */
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130 protected bool handleAddition(Object mapValue) {
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131 Integer count = cast(Integer) valueCounts.get(mapValue);
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132 if (count is null) {
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133 valueCounts.put(mapValue, new Integer(1));
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134 return true;
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135 }
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136 valueCounts.put(mapValue, new Integer(count.intValue() + 1));
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137 return false;
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138 }
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139
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140 /**
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141 * @param mapValue
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142 * @return true if the given mapValue has been removed
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143 */
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144 protected bool handleRemoval(Object mapValue) {
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145 Integer count = cast(Integer) valueCounts.get(mapValue);
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146 if (count.intValue() <= 1) {
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147 valueCounts.remove(mapValue);
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148 return true;
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149 }
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150 valueCounts.put(mapValue, new Integer(count.intValue() - 1));
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151 return false;
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152 }
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153
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154 public synchronized void dispose() {
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155 wrappedMap.removeMapChangeListener(mapChangeListener);
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156 input.removeSetChangeListener(domainListener);
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157 }
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158
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159 }