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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/list/ComputedList.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) 2007 Matthew Hall and others. All rights reserved. This program and the
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3 * accompanying materials are made available under the terms of the Eclipse Public License v1.0 which
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4 * accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
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5 *
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6 * Contributors:
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7 * Matthew Hall - initial API and implementation
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8 * IBM Corporation - initial API and implementation
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9 * Brad Reynolds - initial API and implementation (through bug 116920 and bug 147515)
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10 * Matthew Hall - bug 211786
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11 ***********************************************************************************************************/
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12 module org.eclipse.core.databinding.observable.list.ComputedList;
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13 import org.eclipse.core.databinding.observable.list.IListChangeListener;
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14 import org.eclipse.core.databinding.observable.list.AbstractObservableList;
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15 import org.eclipse.core.databinding.observable.list.ListDiffEntry;
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16 import org.eclipse.core.databinding.observable.list.ListDiff;
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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.ArrayList;
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21 import java.util.Collections;
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22 import java.util.List;
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23
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24 import org.eclipse.core.databinding.observable.ChangeEvent;
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25 import org.eclipse.core.databinding.observable.Diffs;
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26 import org.eclipse.core.databinding.observable.IChangeListener;
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27 import org.eclipse.core.databinding.observable.IObservable;
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28 import org.eclipse.core.databinding.observable.IStaleListener;
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29 import org.eclipse.core.databinding.observable.ObservableTracker;
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30 import org.eclipse.core.databinding.observable.Realm;
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31 import org.eclipse.core.databinding.observable.StaleEvent;
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32
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33 /**
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34 * A Lazily calculated list that automatically computes and registers listeners
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35 * on its dependencies as long as all of its dependencies are IObservable
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36 * objects
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37 * <p>
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38 * This class is thread safe. All state accessing methods must be invoked from
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39 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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40 * listeners may be invoked from any thread.
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41 * </p>
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42 *
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43 * @since 1.1
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44 */
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45 public abstract class ComputedList : AbstractObservableList {
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46 private List cachedList = new ArrayList();
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47
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48 private bool dirty = true;
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49 private bool stale = false;
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50
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51 private IObservable[] dependencies = new IObservable[0];
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52
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53 /**
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54 * Creates a computed list in the default realm and with an unknown (null)
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55 * element type.
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56 */
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57 public this() {
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58 this(Realm.getDefault(), null);
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59 }
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60
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61 /**
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62 * Creates a computed list in the default realm and with the given element
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63 * type.
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64 *
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65 * @param elementType
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66 * the element type, may be <code>null</code> to indicate
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67 * unknown element type
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68 */
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69 public this(Object elementType) {
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70 this(Realm.getDefault(), elementType);
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71 }
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72
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73 /**
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74 * Creates a computed list in given realm and with an unknown (null) element
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75 * type.
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76 *
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77 * @param realm
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78 * the realm
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79 *
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80 */
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81 public this(Realm realm) {
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82 this(realm, null);
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83 }
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84
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85 /**
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86 * Creates a computed list in the given realm and with the given element
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87 * type.
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88 *
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89 * @param realm
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90 * the realm
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91 * @param elementType
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92 * the element type, may be <code>null</code> to indicate
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93 * unknown element type
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94 */
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95 public this(Realm realm, Object elementType) {
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96 super(realm);
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97 this.elementType = elementType;
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98 }
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99
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100 /**
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101 * Inner class that implements interfaces that we don't want to expose as
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102 * public API. Each interface could have been implemented using a separate
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103 * anonymous class, but we combine them here to reduce the memory overhead
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104 * and number of classes.
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105 *
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106 * <p>
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107 * The Runnable calls calculate and stores the result in cachedList.
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108 * </p>
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109 *
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110 * <p>
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111 * The IChangeListener stores each observable in the dependencies list. This
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112 * is registered as the listener when calling ObservableTracker, to detect
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113 * every observable that is used by computeValue.
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114 * </p>
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115 *
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116 * <p>
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117 * The IChangeListener is attached to every dependency.
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118 * </p>
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119 *
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120 */
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121 private class PrivateInterface : Runnable, IChangeListener,
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122 IStaleListener {
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123 public void run() {
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124 cachedList = calculate();
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125 if (cachedList is null)
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126 cachedList = Collections.EMPTY_LIST;
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127 }
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128
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129 public void handleStale(StaleEvent event) {
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130 if (!dirty)
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131 makeStale();
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132 }
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133
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134 public void handleChange(ChangeEvent event) {
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135 makeDirty();
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136 }
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137 }
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138
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139 private PrivateInterface privateInterface = new PrivateInterface();
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140
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141 private Object elementType;
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142
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143 protected int doGetSize() {
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144 return doGetList().size();
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145 }
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146
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147 public Object get(int index) {
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148 getterCalled();
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149 return doGetList().get(index);
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150 }
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151
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152 private final List getList() {
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153 getterCalled();
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154 return doGetList();
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155 }
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156
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157 final List doGetList() {
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158 if (dirty) {
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159 // This line will do the following:
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160 // - Run the calculate method
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161 // - While doing so, add any observable that is touched to the
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162 // dependencies list
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163 IObservable[] newDependencies = ObservableTracker.runAndMonitor(
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164 privateInterface, privateInterface, null);
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165
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166 // If any dependencies are stale, a stale event will be fired here
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167 // even if we were already stale before recomputing. This is in case
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168 // clients assume that a list change is indicative of non-staleness.
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169 stale = false;
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170 for (int i = 0; i < newDependencies.length; i++) {
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171 if (newDependencies[i].isStale()) {
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172 makeStale();
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173 break;
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174 }
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175 }
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176
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177 if (!stale) {
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178 for (int i = 0; i < newDependencies.length; i++) {
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179 newDependencies[i].addStaleListener(privateInterface);
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180 }
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181 }
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182
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183 dependencies = newDependencies;
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184
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185 dirty = false;
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186 }
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187
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188 return cachedList;
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189 }
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190
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191 private void getterCalled() {
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192 ObservableTracker.getterCalled(this);
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193 }
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194
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195 /**
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196 * Subclasses must override this method to calculate the list contents.
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197 *
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198 * @return the object's list.
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199 */
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200 protected abstract List calculate();
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201
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202 private void makeDirty() {
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203 if (!dirty) {
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204 dirty = true;
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205
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206 makeStale();
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207
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208 stopListening();
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209
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210 // copy the old list
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211 final List oldList = new ArrayList(cachedList);
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212 // Fire the "dirty" event. This implementation recomputes the new
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213 // list lazily.
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214 fireListChange(new class() ListDiff {
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215 ListDiffEntry[] differences;
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216
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217 public ListDiffEntry[] getDifferences() {
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218 if (differences is null)
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219 differences = Diffs.computeListDiff(oldList, getList())
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220 .getDifferences();
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221 return differences;
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222 }
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223 });
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224 }
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225 }
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226
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227 private void stopListening() {
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228 if (dependencies !is null) {
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229 for (int i = 0; i < dependencies.length; i++) {
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230 IObservable observable = dependencies[i];
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231
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232 observable.removeChangeListener(privateInterface);
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233 observable.removeStaleListener(privateInterface);
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234 }
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235 dependencies = null;
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236 }
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237 }
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238
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239 private void makeStale() {
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240 if (!stale) {
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241 stale = true;
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242 fireStale();
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243 }
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244 }
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245
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246 public bool isStale() {
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247 // recalculate list if dirty, to ensure staleness is correct.
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248 getList();
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249 return stale;
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250 }
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251
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252 public Object getElementType() {
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253 return elementType;
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254 }
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255
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256 public synchronized void addChangeListener(IChangeListener listener) {
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257 super.addChangeListener(listener);
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258 // If somebody is listening, we need to make sure we attach our own
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259 // listeners
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260 computeListForListeners();
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261 }
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262
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263 public synchronized void addListChangeListener(IListChangeListener listener) {
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264 super.addListChangeListener(listener);
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265 // If somebody is listening, we need to make sure we attach our own
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266 // listeners
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267 computeListForListeners();
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268 }
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269
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270 private void computeListForListeners() {
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271 // Some clients just add a listener and expect to get notified even if
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272 // they never called getValue(), so we have to call getValue() ourselves
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273 // here to be sure. Need to be careful about realms though, this method
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274 // can be called outside of our realm.
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275 // See also bug 198211. If a client calls this outside of our realm,
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276 // they may receive change notifications before the runnable below has
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277 // been executed. It is their job to figure out what to do with those
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278 // notifications.
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279 getRealm().exec(new class() Runnable {
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280 public void run() {
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281 if (dependencies is null) {
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282 // We are not currently listening.
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283 // But someone is listening for changes. Call getValue()
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284 // to make sure we start listening to the observables we
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285 // depend on.
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286 getList();
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287 }
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288 }
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289 });
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290 }
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291
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292 public synchronized void dispose() {
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293 stopListening();
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294 super.dispose();
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295 }
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296 }