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annotate org.eclipse.core.databinding.beans/src/org/eclipse/core/internal/databinding/beans/JavaBeanPropertyObservableMap.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 48d4ee626868
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1 /*******************************************************************************
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2 * Copyright (c) 2008 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 221704)
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10 * Matthew Hall - bugs 223164, 244098
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11 *******************************************************************************/
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12
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13 module org.eclipse.core.internal.databinding.beans.JavaBeanPropertyObservableMap;
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14 import org.eclipse.core.internal.databinding.beans.ListenerSupport;
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15
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16 import java.lang.all;
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17
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18 import java.beans.PropertyChangeEvent;
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19 import java.beans.PropertyChangeListener;
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20 import java.beans.PropertyDescriptor;
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21 import java.lang.reflect.InvocationTargetException;
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22 import java.lang.reflect.Method;
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23 import java.util.Collections;
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24 import java.util.HashMap;
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25 import java.util.HashSet;
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26 import java.util.Iterator;
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27 import java.util.Map;
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28 import java.util.Set;
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29
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30 import org.eclipse.core.databinding.BindingException;
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31 import org.eclipse.core.databinding.beans.IBeanObservable;
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32 import org.eclipse.core.databinding.observable.Diffs;
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33 import org.eclipse.core.databinding.observable.Realm;
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34 import org.eclipse.core.databinding.observable.map.ObservableMap;
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35 import org.eclipse.core.internal.databinding.Util;
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36 import org.eclipse.core.runtime.Assert;
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37
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38 /**
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39 * @since 1.0
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40 *
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41 */
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42 public class JavaBeanPropertyObservableMap : ObservableMap ,
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43 IBeanObservable {
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44
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45 private final Object object;
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46
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47 private bool updating = false;
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48
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49 private PropertyDescriptor descriptor;
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50
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51 private ListenerSupport listenerSupport;
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52
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53 /**
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54 * @param realm
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55 * @param object
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56 * @param descriptor
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57 */
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58 public this(Realm realm, Object object,
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59 PropertyDescriptor descriptor) {
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60 this(realm, object, descriptor, true);
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61 }
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62
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63 /**
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64 * @param realm
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65 * @param object
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66 * @param descriptor
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67 * @param attachListeners
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68 */
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69 public this(Realm realm, Object object,
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70 PropertyDescriptor descriptor, bool attachListeners) {
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71 super(realm, new HashMap());
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72 this.object = object;
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73 this.descriptor = descriptor;
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74 if (attachListeners) {
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75 PropertyChangeListener listener = new class() PropertyChangeListener {
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76 public void propertyChange(final PropertyChangeEvent event) {
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77 if (!updating) {
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78 getRealm().exec(new class() Runnable {
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79 public void run() {
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80 Map oldValue = wrappedMap;
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81 Map newValue = cast(Map) event.getNewValue();
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82 wrappedMap = new HashMap(newValue);
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83
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84 fireMapChange(Diffs.computeMapDiff(oldValue, newValue));
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85 }
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86 });
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87 }
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88 }
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89 };
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90
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91 listenerSupport = new ListenerSupport(listener,
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92 descriptor.getName());
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93 listenerSupport.hookListener(this.object);
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94 }
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95
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96 wrappedMap.putAll(getMap());
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97 }
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98
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99 private Object primGetMap() {
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100 try {
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101 Method readMethod = descriptor.getReadMethod();
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102 if (!readMethod.isAccessible()) {
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103 readMethod.setAccessible(true);
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104 }
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105 return readMethod.invoke(object, new Object[0]);
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106 } catch (IllegalArgumentException e) {
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107 } catch (IllegalAccessException e) {
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108 } catch (InvocationTargetException e) {
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109 }
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110 Assert.isTrue(false, "Could not read collection values"); //$NON-NLS-1$
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111 return null;
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112 }
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113
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114 private void primSetMap(Object newValue) {
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115 Exception ex = null;
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116 try {
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117 Method writeMethod = descriptor.getWriteMethod();
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118 if (!writeMethod.isAccessible()) {
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119 writeMethod.setAccessible(true);
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120 }
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121 writeMethod.invoke(object, new Object[] { newValue });
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122 return;
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123 } catch (IllegalArgumentException e) {
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124 ex = e;
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125 } catch (IllegalAccessException e) {
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126 ex = e;
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127 } catch (InvocationTargetException e) {
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128 ex = e;
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129 }
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130 throw new BindingException("Could not write collection values", ex); //$NON-NLS-1$
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131 }
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132
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133 private Map getMap() {
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134 Map result = cast(Map) primGetMap();
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135
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136 if (result is null)
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137 result = new HashMap();
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138 return result;
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139 }
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140
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141 private void setMap() {
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142 primSetMap(new HashMap(wrappedMap));
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143 }
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144
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145 public Object put(Object key, Object value) {
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146 checkRealm();
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147 updating = true;
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148 try {
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149 Object result = wrappedMap.put(key, value);
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150 if (!Util.equals(result, value)) {
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151 setMap();
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152 if (result is null) {
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153 fireMapChange(Diffs.createMapDiffSingleAdd(key, value));
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154 } else {
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155 fireMapChange(Diffs.createMapDiffSingleChange(key, result,
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156 value));
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157 }
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158 }
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159 return result;
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160 } finally {
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161 updating = false;
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162 }
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163 }
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164
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165 public void putAll(Map map) {
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166 checkRealm();
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167 updating = true;
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168 try {
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169 Set addedKeys = new HashSet(map.size());
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170 Map changes = new HashMap(map.size());
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171 for (Iterator it = map.entrySet().iterator(); it.hasNext();) {
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172 Map.Entry entry = cast(Entry) it.next();
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173 Object key = entry.getKey();
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174 Object newValue = entry.getValue();
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175 Object oldValue = wrappedMap.put(key, newValue);
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176 if (oldValue is null) {
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177 addedKeys.add(key);
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178 } else if (!Util.equals(oldValue, newValue)) {
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179 changes.put(key, oldValue);
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180 }
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181 }
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182 if (!addedKeys.isEmpty() || !changes.isEmpty()) {
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183 setMap();
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184 fireMapChange(Diffs.createMapDiff(addedKeys,
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185 Collections.EMPTY_SET, changes.keySet(), changes,
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186 wrappedMap));
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187 }
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188 } finally {
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189 updating = false;
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190 }
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191 }
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192
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193 public Object remove(Object key) {
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194 checkRealm();
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195 updating = true;
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196 try {
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197 Object result = wrappedMap.remove(key);
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198 if (result!isnull) {
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199 setMap();
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200 fireMapChange(Diffs.createMapDiffSingleRemove(key, result));
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201 }
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202 return result;
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203 } finally {
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204 updating = false;
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205 }
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206 }
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207
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208 public void clear() {
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209 checkRealm();
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210 if (wrappedMap.isEmpty())
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211 return;
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212 updating = true;
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213 try {
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214 Map oldMap = wrappedMap;
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215 wrappedMap = new HashMap();
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216 setMap();
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217 fireMapChange(Diffs.computeMapDiff(oldMap, Collections.EMPTY_MAP));
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218 } finally {
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219 updating = false;
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220 }
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221 }
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222
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223 public Object getObserved() {
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224 return object;
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225 }
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226
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227 public PropertyDescriptor getPropertyDescriptor() {
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228 return descriptor;
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229 }
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230
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231 public synchronized void dispose() {
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232 if (listenerSupport !is null) {
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233 listenerSupport.dispose();
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234 listenerSupport = null;
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235 }
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236 super.dispose();
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237 }
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238 }