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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/list/ComputedList.d @ 95:6208d4f6a277

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