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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/set/MappedSet.d @ 97:c86eb8b3098e

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packageimport
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 11:18:25 +0200
parents b74ac5dfcc06
children
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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 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
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14 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
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15 import org.eclipse.core.databinding.observable.set.IObservableSet;
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16 import org.eclipse.core.databinding.observable.set.ObservableSet;
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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.Diffs;
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28 import org.eclipse.core.databinding.observable.Realm;
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29 import org.eclipse.core.databinding.observable.map.IMapChangeListener;
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30 import org.eclipse.core.databinding.observable.map.IObservableMap;
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31 import org.eclipse.core.databinding.observable.map.MapChangeEvent;
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32 import org.eclipse.core.databinding.observable.map.MapDiff;
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33
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34 /**
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35 *
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36 * <p>
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37 * This class is thread safe. All state accessing methods must be invoked from
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38 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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39 * listeners may be invoked from any thread.
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40 * </p>
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41 *
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42 * @since 1.0
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43 *
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44 */
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45 public class MappedSet : ObservableSet {
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46
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47 private final IObservableMap wrappedMap;
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48
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49 /*
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50 * Map from values (range elements) to Integer ref counts
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51 */
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52 private Map valueCounts = new HashMap();
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53
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54 private ISetChangeListener domainListener = new class() ISetChangeListener {
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55 public void handleSetChange(SetChangeEvent event) {
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56 Set additions = new HashSet();
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57 for (Iterator it = event.diff.getAdditions().iterator(); it.hasNext();) {
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58 Object added = it.next();
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59 Object mapValue = wrappedMap.get(added);
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60 if (handleAddition(mapValue)) {
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61 additions.add(mapValue);
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62 }
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63 }
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64 Set removals = new HashSet();
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65 for (Iterator it = event.diff.getRemovals().iterator(); it.hasNext();) {
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66 Object removed = it.next();
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67 Object mapValue = wrappedMap.get(removed);
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68 if (handleRemoval(mapValue)) {
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69 removals.add(mapValue);
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70 }
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71 }
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72 fireSetChange(Diffs.createSetDiff(additions, removals));
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73 }
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74 };
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75
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76 private IMapChangeListener mapChangeListener = new class() IMapChangeListener {
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77 public void handleMapChange(MapChangeEvent event) {
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78 MapDiff diff = event.diff;
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79 Set additions = new HashSet();
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80 Set removals = new HashSet();
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81 for (Iterator it = diff.getRemovedKeys().iterator(); it.hasNext();) {
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82 Object key = it.next();
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83 Object oldValue = diff.getOldValue(key);
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84 if (handleRemoval(oldValue)) {
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85 removals.add(oldValue);
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86 }
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87 }
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88 for (Iterator it = diff.getChangedKeys().iterator(); it.hasNext();) {
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89 Object key = it.next();
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90 Object oldValue = diff.getOldValue(key);
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91 Object newValue = diff.getNewValue(key);
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92 if (handleRemoval(oldValue)) {
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93 removals.add(oldValue);
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94 }
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95 if (handleAddition(newValue)) {
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96 additions.add(newValue);
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97 }
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98 }
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99 for (Iterator it = diff.getAddedKeys().iterator(); it.hasNext();) {
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100 Object key = it.next();
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101 Object newValue = diff.getNewValue(key);
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102 if (handleAddition(newValue)) {
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103 additions.add(newValue);
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104 }
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105 }
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106 fireSetChange(Diffs.createSetDiff(additions, removals));
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107 }
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108 };
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109
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110 private IObservableSet input;
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111
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112 /**
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113 * @param input
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114 * @param map
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115 */
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116 public this(IObservableSet input, IObservableMap map) {
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117 super(input.getRealm(), Collections.EMPTY_SET, Object.class);
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118 setWrappedSet(valueCounts.keySet());
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119 this.wrappedMap = map;
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120 this.input = input;
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121 for (Iterator it = input.iterator(); it.hasNext();) {
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122 Object element = it.next();
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123 Object functionValue = wrappedMap.get(element);
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124 handleAddition(functionValue);
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125 }
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126 input.addSetChangeListener(domainListener);
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127 map.addMapChangeListener(mapChangeListener);
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128 }
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129
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130 /**
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131 * @param mapValue
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132 * @return true if the given mapValue was an addition
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133 */
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134 protected bool handleAddition(Object mapValue) {
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135 Integer count = cast(Integer) valueCounts.get(mapValue);
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136 if (count is null) {
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137 valueCounts.put(mapValue, new Integer(1));
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138 return true;
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139 }
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140 valueCounts.put(mapValue, new Integer(count.intValue() + 1));
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141 return false;
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142 }
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143
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144 /**
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145 * @param mapValue
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146 * @return true if the given mapValue has been removed
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147 */
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148 protected bool handleRemoval(Object mapValue) {
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149 Integer count = cast(Integer) valueCounts.get(mapValue);
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150 if (count.intValue() <= 1) {
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151 valueCounts.remove(mapValue);
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152 return true;
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153 }
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154 valueCounts.put(mapValue, new Integer(count.intValue() - 1));
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155 return false;
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156 }
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157
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158 public synchronized void dispose() {
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159 wrappedMap.removeMapChangeListener(mapChangeListener);
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160 input.removeSetChangeListener(domainListener);
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161 }
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162
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163 }