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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/ValidatedObservableMap.d @ 96:b74ac5dfcc06

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package to module and java.lang.all import
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 11:03:33 +0200
parents 6208d4f6a277
children
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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 218269)
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10 ******************************************************************************/
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11
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12 module org.eclipse.core.internal.databinding.observable.ValidatedObservableMap;
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13
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14 import java.lang.all;
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15
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16 import java.util.Collections;
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17 import java.util.HashMap;
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18 import java.util.Iterator;
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19 import java.util.Map;
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20
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21 import org.eclipse.core.databinding.observable.Diffs;
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22 import org.eclipse.core.databinding.observable.IStaleListener;
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23 import org.eclipse.core.databinding.observable.StaleEvent;
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24 import org.eclipse.core.databinding.observable.map.IMapChangeListener;
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25 import org.eclipse.core.databinding.observable.map.IObservableMap;
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26 import org.eclipse.core.databinding.observable.map.MapChangeEvent;
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27 import org.eclipse.core.databinding.observable.map.MapDiff;
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28 import org.eclipse.core.databinding.observable.map.ObservableMap;
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29 import org.eclipse.core.databinding.observable.value.IObservableValue;
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30 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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31 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
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32 import org.eclipse.core.runtime.Assert;
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33 import org.eclipse.core.runtime.IStatus;
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34
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35 /**
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36 * @since 3.3
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37 *
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38 */
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39 public class ValidatedObservableMap : ObservableMap {
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40 private IObservableMap target;
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41 private IObservableValue validationStatus;
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42
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43 // Only true when out of sync with target due to validation status
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44 private bool stale;
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45
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46 // True when validation status changes from invalid to valid.
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47 private bool computeNextDiff = false;
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48
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49 private bool updatingTarget = false;
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50
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51 private IMapChangeListener targetChangeListener = new class() IMapChangeListener {
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52 public void handleMapChange(MapChangeEvent event) {
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53 if (updatingTarget)
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54 return;
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55 IStatus status = cast(IStatus) validationStatus.getValue();
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56 if (isValid(status)) {
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57 if (stale) {
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58 // this.stale means we are out of sync with target,
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59 // so reset wrapped list to exactly mirror target
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60 stale = false;
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61 updateWrappedMap(new HashMap(target));
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62 } else {
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63 MapDiff diff = event.diff;
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64 if (computeNextDiff) {
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65 diff = Diffs.computeMapDiff(wrappedMap, target);
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66 computeNextDiff = false;
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67 }
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68 applyDiff(diff, wrappedMap);
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69 fireMapChange(diff);
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70 }
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71 } else {
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72 makeStale();
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73 }
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74 }
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75 };
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76
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77 private IStaleListener targetStaleListener = new class() IStaleListener {
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78 public void handleStale(StaleEvent staleEvent) {
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79 fireStale();
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80 }
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81 };
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82
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83 private IValueChangeListener validationStatusChangeListener = new class() IValueChangeListener {
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84 public void handleValueChange(ValueChangeEvent event) {
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85 IStatus oldStatus = cast(IStatus) event.diff.getOldValue();
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86 IStatus newStatus = cast(IStatus) event.diff.getNewValue();
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87 if (stale && !isValid(oldStatus) && isValid(newStatus)) {
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88 // this.stale means we are out of sync with target,
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89 // reset wrapped map to exactly mirror target
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90 stale = false;
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91 updateWrappedMap(new HashMap(target));
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92
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93 // If the validation status becomes valid because of a change in
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94 // target observable
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95 computeNextDiff = true;
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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 /**
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101 * @param target
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102 * @param validationStatus
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103 */
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104 public this(final IObservableMap target,
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105 final IObservableValue validationStatus) {
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106 super(target.getRealm(), new HashMap(target));
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107 Assert.isNotNull(validationStatus,
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108 "Validation status observable cannot be null"); //$NON-NLS-1$
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109 Assert
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110 .isTrue(target.getRealm().equals(validationStatus.getRealm()),
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111 "Target and validation status observables must be on the same realm"); //$NON-NLS-1$
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112 this.target = target;
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113 this.validationStatus = validationStatus;
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114 target.addMapChangeListener(targetChangeListener);
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115 target.addStaleListener(targetStaleListener);
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116 validationStatus.addValueChangeListener(validationStatusChangeListener);
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117 }
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118
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119 private void updateWrappedMap(Map newMap) {
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120 Map oldMap = wrappedMap;
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121 MapDiff diff = Diffs.computeMapDiff(oldMap, newMap);
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122 wrappedMap = newMap;
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123 fireMapChange(diff);
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124 }
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125
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126 private static bool isValid(IStatus status) {
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127 return status.isOK() || status.matches(IStatus.INFO | IStatus.WARNING);
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128 }
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129
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130 private void applyDiff(MapDiff diff, Map map) {
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131 for (Iterator iterator = diff.getRemovedKeys().iterator(); iterator
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132 .hasNext();)
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133 map.remove(iterator.next());
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134 for (Iterator iterator = diff.getChangedKeys().iterator(); iterator
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135 .hasNext();) {
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136 Object key = iterator.next();
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137 map.put(key, diff.getNewValue(key));
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138 }
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139 for (Iterator iterator = diff.getAddedKeys().iterator(); iterator
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140 .hasNext();) {
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141 Object key = iterator.next();
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142 map.put(key, diff.getNewValue(key));
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143 }
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144 }
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145
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146 private void makeStale() {
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147 if (!stale) {
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148 stale = true;
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149 fireStale();
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150 }
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151 }
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152
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153 private void updateTargetMap(MapDiff diff) {
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154 updatingTarget = true;
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155 try {
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156 if (stale) {
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157 stale = false;
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158 applyDiff(Diffs.computeMapDiff(target, wrappedMap), target);
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159 } else {
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160 applyDiff(diff, target);
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161 }
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162 } finally {
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163 updatingTarget = false;
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164 }
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165 }
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166
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167 public bool isStale() {
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168 getterCalled();
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169 return stale || target.isStale();
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170 }
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171
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172 public void clear() {
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173 checkRealm();
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174 if (isEmpty())
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175 return;
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176 MapDiff diff = Diffs.computeMapDiff(wrappedMap, Collections.EMPTY_MAP);
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177 wrappedMap = new HashMap();
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178 updateTargetMap(diff);
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179 fireMapChange(diff);
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180 }
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181
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182 public Object put(Object key, Object value) {
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183 checkRealm();
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184 MapDiff diff;
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185 Object oldValue;
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186 if (wrappedMap.containsKey(key)) {
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187 oldValue = wrappedMap.put(key, value);
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188 if (wrappedMap.containsKey(key)) { // Changed
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189 diff = Diffs.createMapDiffSingleChange(key, oldValue, value);
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190 } else { // Removed
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191 diff = Diffs.createMapDiffSingleRemove(key, oldValue);
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192 }
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193 } else { // Added
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194 oldValue = wrappedMap.put(key, value);
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195 diff = Diffs.createMapDiffSingleAdd(key, value);
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196 }
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197 updateTargetMap(diff);
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198 fireMapChange(diff);
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199 return oldValue;
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200 }
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201
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202 public void putAll(Map m) {
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203 checkRealm();
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204 Map map = new HashMap(wrappedMap);
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205 map.putAll(m);
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206 MapDiff diff = Diffs.computeMapDiff(wrappedMap, map);
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207 wrappedMap = map;
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208 updateTargetMap(diff);
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209 fireMapChange(diff);
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210 }
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211
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212 public Object remove(Object key) {
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213 checkRealm();
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214 if (!wrappedMap.containsKey(key))
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215 return null;
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216 Object oldValue = wrappedMap.remove(key);
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217 MapDiff diff = Diffs.createMapDiffSingleRemove(key, oldValue);
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218 updateTargetMap(diff);
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219 fireMapChange(diff);
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220 return oldValue;
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221 }
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222
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223 public synchronized void dispose() {
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224 target.removeMapChangeListener(targetChangeListener);
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225 target.removeStaleListener(targetStaleListener);
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226 validationStatus
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227 .removeValueChangeListener(validationStatusChangeListener);
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228 super.dispose();
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229 }
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230 }