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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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81
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13 import org.eclipse.core.databinding.observable.map.AbstractObservableMap;
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78
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14
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15 import java.lang.all;
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16
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17 import java.util.AbstractSet;
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18 import java.util.Collections;
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19 import java.util.HashMap;
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20 import java.util.HashSet;
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21 import java.util.Iterator;
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22 import java.util.Map;
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23 import java.util.Set;
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24
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25 import org.eclipse.core.databinding.observable.Diffs;
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26 import org.eclipse.core.databinding.observable.set.IObservableSet;
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27 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
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28 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
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29
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30 /**
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31 * Maps objects to one of their attributes. Tracks changes to the underlying
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32 * observable set of objects (keys), as well as changes to attribute values.
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33 */
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34 public abstract class ComputedObservableMap : AbstractObservableMap {
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35
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36 private final IObservableSet keySet;
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37
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38 private ISetChangeListener setChangeListener = new class() ISetChangeListener {
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39 public void handleSetChange(SetChangeEvent event) {
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40 Set addedKeys = new HashSet(event.diff.getAdditions());
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41 Set removedKeys = new HashSet(event.diff.getRemovals());
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42 Map oldValues = new HashMap();
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43 Map newValues = new HashMap();
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44 for (Iterator it = removedKeys.iterator(); it.hasNext();) {
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45 Object removedKey = it.next();
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46 Object oldValue = doGet(removedKey);
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47 unhookListener(removedKey);
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48 if (oldValue !is null) {
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49 oldValues.put(removedKey, oldValue);
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50 }
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51 }
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52 for (Iterator it = addedKeys.iterator(); it.hasNext();) {
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53 Object addedKey = it.next();
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54 hookListener(addedKey);
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55 Object newValue = doGet(addedKey);
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56 newValues.put(addedKey, newValue);
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57 }
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58 fireMapChange(Diffs.createMapDiff(addedKeys, removedKeys,
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59 Collections.EMPTY_SET, oldValues, newValues));
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60 }
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61 };
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62
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63 private Set entrySet = new EntrySet();
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64
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65 private class EntrySet : AbstractSet {
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66
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67 public Iterator iterator() {
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68 return new class() Iterator {
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69
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70 final Iterator keyIterator;
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71 this(){
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72 keyIterator = keySet.iterator();
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73 }
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74
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75 public bool hasNext() {
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76 return keyIterator.hasNext();
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77 }
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78
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79 public Object next() {
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80 return new class() Map.Entry {
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81 Object key;
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82 this(){
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83 key = keyIterator.next();
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84 }
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85
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86 public Object getKey() {
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87 return key;
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88 }
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89
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90 public Object getValue() {
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91 return get(getKey());
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92 }
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93
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94 public Object setValue(Object value) {
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95 return put(getKey(), value);
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96 }
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97 };
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98 }
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99
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100 public void remove() {
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101 keyIterator.remove();
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102 }
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103 };
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104 }
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105
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106 public int size() {
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107 return keySet.size();
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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 /**
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113 * @param keySet
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114 */
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115 public this(IObservableSet keySet) {
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116 super(keySet.getRealm());
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117 this.keySet = keySet;
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118 this.keySet.addSetChangeListener(setChangeListener);
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119 }
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120
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121 protected void init() {
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122 for (Iterator it = this.keySet.iterator(); it.hasNext();) {
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123 Object key = it.next();
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124 hookListener(key);
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125 }
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126 }
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127
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128 protected final void fireSingleChange(Object key, Object oldValue,
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129 Object newValue) {
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130 fireMapChange(Diffs.createMapDiffSingleChange(key, oldValue, newValue));
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131 }
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132
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133 public Set entrySet() {
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134 return entrySet;
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135 }
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136
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137 public Set keySet() {
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138 return keySet;
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139 }
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140
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141 final public Object get(Object key) {
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142 return doGet(key);
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143 }
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144
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145 final public Object put(Object key, Object value) {
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146 return doPut(key, value);
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147 }
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148
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149 /**
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150 * @param removedKey
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151 */
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152 protected abstract void unhookListener(Object removedKey);
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153
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154 /**
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155 * @param addedKey
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156 */
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157 protected abstract void hookListener(Object addedKey);
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158
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159 /**
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160 * @param key
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161 * @return the value for the given key
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162 */
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163 protected abstract Object doGet(Object key);
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164
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165 /**
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166 * @param key
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167 * @param value
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168 * @return the old value for the given key
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169 */
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170 protected abstract Object doPut(Object key, Object value);
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171 }
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