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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.map.ComputedObservableMap;
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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.AbstractSet;
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17 import java.util.Collections;
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18 import java.util.HashMap;
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19 import java.util.HashSet;
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20 import java.util.Iterator;
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21 import java.util.Map;
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22 import java.util.Set;
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23
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24 import org.eclipse.core.databinding.observable.Diffs;
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25 import org.eclipse.core.databinding.observable.set.IObservableSet;
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26 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
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27 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
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28
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29 /**
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30 * Maps objects to one of their attributes. Tracks changes to the underlying
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31 * observable set of objects (keys), as well as changes to attribute values.
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32 */
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33 public abstract class ComputedObservableMap : AbstractObservableMap {
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34
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35 private final IObservableSet keySet;
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36
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37 private ISetChangeListener setChangeListener = new class() ISetChangeListener {
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38 public void handleSetChange(SetChangeEvent event) {
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39 Set addedKeys = new HashSet(event.diff.getAdditions());
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40 Set removedKeys = new HashSet(event.diff.getRemovals());
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41 Map oldValues = new HashMap();
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42 Map newValues = new HashMap();
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43 for (Iterator it = removedKeys.iterator(); it.hasNext();) {
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44 Object removedKey = it.next();
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45 Object oldValue = doGet(removedKey);
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46 unhookListener(removedKey);
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47 if (oldValue !is null) {
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48 oldValues.put(removedKey, oldValue);
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49 }
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50 }
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51 for (Iterator it = addedKeys.iterator(); it.hasNext();) {
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52 Object addedKey = it.next();
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53 hookListener(addedKey);
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54 Object newValue = doGet(addedKey);
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55 newValues.put(addedKey, newValue);
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56 }
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57 fireMapChange(Diffs.createMapDiff(addedKeys, removedKeys,
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58 Collections.EMPTY_SET, oldValues, newValues));
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59 }
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60 };
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61
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62 private Set entrySet = new EntrySet();
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63
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64 private class EntrySet : AbstractSet {
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65
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66 public Iterator iterator() {
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67 return new class() Iterator {
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68
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69 final Iterator keyIterator;
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70 this(){
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71 keyIterator = keySet.iterator();
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72 }
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73
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74 public bool hasNext() {
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75 return keyIterator.hasNext();
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76 }
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77
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78 public Object next() {
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79 return new class() Map.Entry {
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80 Object key;
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81 this(){
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82 key = keyIterator.next();
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83 }
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84
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85 public Object getKey() {
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86 return key;
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87 }
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88
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89 public Object getValue() {
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90 return get(getKey());
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91 }
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92
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93 public Object setValue(Object value) {
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94 return put(getKey(), value);
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95 }
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96 };
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97 }
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98
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99 public void remove() {
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100 keyIterator.remove();
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101 }
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102 };
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103 }
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104
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105 public int size() {
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106 return keySet.size();
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107 }
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108
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109 }
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110
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111 /**
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112 * @param keySet
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113 */
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114 public this(IObservableSet keySet) {
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115 super(keySet.getRealm());
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116 this.keySet = keySet;
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117 this.keySet.addSetChangeListener(setChangeListener);
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118 }
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119
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120 protected void init() {
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121 for (Iterator it = this.keySet.iterator(); it.hasNext();) {
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122 Object key = it.next();
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123 hookListener(key);
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124 }
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125 }
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126
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127 protected final void fireSingleChange(Object key, Object oldValue,
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128 Object newValue) {
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129 fireMapChange(Diffs.createMapDiffSingleChange(key, oldValue, newValue));
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130 }
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131
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132 public Set entrySet() {
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133 return entrySet;
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134 }
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135
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136 public Set keySet() {
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137 return keySet;
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138 }
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139
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140 final public Object get(Object key) {
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141 return doGet(key);
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142 }
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143
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144 final public Object put(Object key, Object value) {
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145 return doPut(key, value);
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146 }
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147
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148 /**
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149 * @param removedKey
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150 */
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151 protected abstract void unhookListener(Object removedKey);
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152
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153 /**
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154 * @param addedKey
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155 */
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156 protected abstract void hookListener(Object addedKey);
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157
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158 /**
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159 * @param key
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160 * @return the value for the given key
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161 */
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162 protected abstract Object doGet(Object key);
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163
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164 /**
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165 * @param key
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166 * @param value
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167 * @return the old value for the given key
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168 */
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169 protected abstract Object doPut(Object key, Object value);
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170 }
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