Mercurial > projects > dwt2
annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/map/AbstractObservableMap.d @ 95:6208d4f6a277
Added trees for databinding.beans and observable
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 10:55:51 +0200 |
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children | b74ac5dfcc06 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2006, 2008 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 * Brad Reynolds - bug 164653 |
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11 * Matthew Hall - bugs 118516, 240931 |
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12 *******************************************************************************/ |
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13 |
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14 package org.eclipse.core.databinding.observable.map; |
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15 |
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16 import java.util.AbstractMap; |
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17 |
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18 import org.eclipse.core.databinding.observable.ChangeEvent; |
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19 import org.eclipse.core.databinding.observable.ChangeSupport; |
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20 import org.eclipse.core.databinding.observable.IChangeListener; |
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21 import org.eclipse.core.databinding.observable.IStaleListener; |
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22 import org.eclipse.core.databinding.observable.Realm; |
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23 import org.eclipse.core.databinding.observable.StaleEvent; |
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24 import org.eclipse.core.runtime.Assert; |
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25 import org.eclipse.core.runtime.AssertionFailedException; |
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26 |
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27 /** |
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28 * |
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29 * <p> |
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30 * This class is thread safe. All state accessing methods must be invoked from |
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31 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing |
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32 * listeners may be invoked from any thread. |
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33 * </p> |
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34 * @since 1.0 |
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35 */ |
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36 public abstract class AbstractObservableMap : AbstractMap , |
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37 IObservableMap { |
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38 |
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39 private ChangeSupport changeSupport; |
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40 |
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41 private bool stale; |
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42 |
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43 /** |
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44 */ |
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45 public this() { |
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46 this(Realm.getDefault()); |
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47 } |
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48 |
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49 /** |
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50 * |
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51 */ |
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52 protected void lastListenerRemoved() { |
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53 } |
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54 |
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55 /** |
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56 * |
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57 */ |
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58 protected void firstListenerAdded() { |
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59 } |
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60 |
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61 /** |
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62 * @param realm |
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63 */ |
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64 public this(Realm realm) { |
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65 Assert.isNotNull(realm, "Realm cannot be null"); //$NON-NLS-1$ |
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66 changeSupport = new class(realm) ChangeSupport { |
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67 protected void firstListenerAdded() { |
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68 this.outer.firstListenerAdded(); |
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69 } |
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70 protected void lastListenerRemoved() { |
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71 this.outer.lastListenerRemoved(); |
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72 } |
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73 }; |
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74 } |
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75 |
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76 public synchronized void addMapChangeListener(IMapChangeListener listener) { |
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77 if (changeSupport !is null) { |
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78 changeSupport.addListener(MapChangeEvent.TYPE, listener); |
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79 } |
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80 } |
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81 |
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82 public synchronized void removeMapChangeListener(IMapChangeListener listener) { |
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83 if (changeSupport !is null) { |
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84 changeSupport.removeListener(MapChangeEvent.TYPE, listener); |
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85 } |
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86 } |
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87 |
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88 public synchronized void addChangeListener(IChangeListener listener) { |
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89 if (changeSupport !is null) { |
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90 changeSupport.addChangeListener(listener); |
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91 } |
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92 } |
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93 |
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94 public synchronized void addStaleListener(IStaleListener listener) { |
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95 if (changeSupport !is null) { |
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96 changeSupport.addStaleListener(listener); |
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97 } |
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98 } |
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99 |
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100 public synchronized void dispose() { |
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101 if (changeSupport !is null) { |
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102 changeSupport.dispose(); |
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103 changeSupport = null; |
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104 } |
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105 } |
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106 |
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107 public Realm getRealm() { |
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108 if (changeSupport !is null) { |
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109 return changeSupport.getRealm(); |
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110 } |
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111 return null; |
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112 } |
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113 |
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114 public bool isStale() { |
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115 checkRealm(); |
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116 return stale; |
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117 } |
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118 |
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119 public synchronized void removeChangeListener(IChangeListener listener) { |
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120 if (changeSupport !is null) { |
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121 changeSupport.removeChangeListener(listener); |
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122 } |
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123 } |
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124 |
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125 public synchronized void removeStaleListener(IStaleListener listener) { |
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126 if (changeSupport !is null) { |
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127 changeSupport.removeStaleListener(listener); |
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128 } |
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129 } |
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130 |
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131 /** |
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132 * Sets the stale state. Must be invoked from the current realm. |
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133 * |
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134 * @param stale |
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135 */ |
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136 public void setStale(bool stale) { |
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137 checkRealm(); |
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138 this.stale = stale; |
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139 if (stale) { |
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140 fireStale(); |
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141 } |
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142 } |
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143 |
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144 /** |
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145 * Fires stale events. Must be invoked from current realm. |
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146 */ |
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147 protected void fireStale() { |
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148 checkRealm(); |
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149 changeSupport.fireEvent(new StaleEvent(this)); |
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150 } |
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151 |
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152 /** |
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153 * Fires change events. Must be invoked from current realm. |
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154 */ |
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155 protected void fireChange() { |
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156 checkRealm(); |
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157 changeSupport.fireEvent(new ChangeEvent(this)); |
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158 } |
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159 |
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160 /** |
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161 * Fires map change events. Must be invoked from current realm. |
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162 * |
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163 * @param diff |
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164 */ |
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165 protected void fireMapChange(MapDiff diff) { |
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166 checkRealm(); |
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167 changeSupport.fireEvent(new MapChangeEvent(this, diff)); |
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168 } |
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169 |
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170 /** |
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171 * Asserts that the realm is the current realm. |
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172 * |
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173 * @see Realm#isCurrent() |
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174 * @throws AssertionFailedException |
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175 * if the realm is not the current realm |
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176 */ |
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177 protected void checkRealm() { |
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178 Assert.isTrue(getRealm().isCurrent(), |
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179 "This operation must be run within the observable's realm"); //$NON-NLS-1$ |
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180 } |
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181 } |