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1 /*******************************************************************************
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2 * Copyright (c) 2007 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 ******************************************************************************/
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11
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12 module org.eclipse.core.databinding.ListBinding;
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81
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13 import org.eclipse.core.databinding.UpdateListStrategy;
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14 import org.eclipse.core.databinding.UpdateValueStrategy;
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15 import org.eclipse.core.databinding.Binding;
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78
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16
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17 import java.lang.all;
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18
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19 import java.util.Collections;
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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.list.IListChangeListener;
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23 import org.eclipse.core.databinding.observable.list.IObservableList;
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24 import org.eclipse.core.databinding.observable.list.ListChangeEvent;
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25 import org.eclipse.core.databinding.observable.list.ListDiff;
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26 import org.eclipse.core.databinding.observable.list.ListDiffEntry;
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27 import org.eclipse.core.databinding.observable.value.IObservableValue;
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28 import org.eclipse.core.databinding.observable.value.WritableValue;
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29 import org.eclipse.core.internal.databinding.BindingStatus;
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30 import org.eclipse.core.runtime.IStatus;
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31 import org.eclipse.core.runtime.MultiStatus;
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32 import org.eclipse.core.runtime.Status;
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33
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34 /**
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35 * @since 1.0
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36 *
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37 */
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38 public class ListBinding : Binding {
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39
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40 private UpdateListStrategy targetToModel;
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41 private UpdateListStrategy modelToTarget;
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42 private IObservableValue validationStatusObservable;
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43 private bool updatingTarget;
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44 private bool updatingModel;
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45
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46 private IListChangeListener targetChangeListener = new class() IListChangeListener {
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47 public void handleListChange(ListChangeEvent event) {
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48 if (!updatingTarget) {
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49 doUpdate(cast(IObservableList) getTarget(),
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50 cast(IObservableList) getModel(), event.diff,
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51 targetToModel, false, false);
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52 }
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53 }
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54 };
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55 private IListChangeListener modelChangeListener = new class() IListChangeListener {
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56 public void handleListChange(ListChangeEvent event) {
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57 if (!updatingModel) {
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58 doUpdate(cast(IObservableList) getModel(),
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59 cast(IObservableList) getTarget(), event.diff,
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60 modelToTarget, false, false);
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61 }
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62 }
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63 };
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64
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65 /**
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66 * @param target
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67 * @param model
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68 * @param modelToTargetStrategy
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69 * @param targetToModelStrategy
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70 */
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71 public this(IObservableList target, IObservableList model,
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72 UpdateListStrategy targetToModelStrategy,
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73 UpdateListStrategy modelToTargetStrategy) {
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74 super(target, model);
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75 this.targetToModel = targetToModelStrategy;
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76 this.modelToTarget = modelToTargetStrategy;
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77 if ((targetToModel.getUpdatePolicy() & UpdateValueStrategy.POLICY_UPDATE) !is 0) {
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78 target.addListChangeListener(targetChangeListener);
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79 } else {
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80 targetChangeListener = null;
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81 }
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82 if ((modelToTarget.getUpdatePolicy() & UpdateValueStrategy.POLICY_UPDATE) !is 0) {
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83 model.addListChangeListener(modelChangeListener);
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84 } else {
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85 modelChangeListener = null;
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86 }
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87 }
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88
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89 public IObservableValue getValidationStatus() {
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90 return validationStatusObservable;
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91 }
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92
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93 protected void preInit() {
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94 validationStatusObservable = new WritableValue(context
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95 .getValidationRealm(), Status.OK_STATUS, IStatus.classinfo);
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96 }
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97
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98 protected void postInit() {
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99 if (modelToTarget.getUpdatePolicy() is UpdateListStrategy.POLICY_UPDATE) {
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100 updateModelToTarget();
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101 }
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102 if (targetToModel.getUpdatePolicy() !is UpdateListStrategy.POLICY_NEVER) {
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103 validateTargetToModel();
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104 }
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105 }
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106
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107 public void updateModelToTarget() {
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108 final IObservableList modelList = cast(IObservableList) getModel();
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109 modelList.getRealm().exec(new class() Runnable {
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110 public void run() {
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111 ListDiff diff = Diffs.computeListDiff(Collections.EMPTY_LIST,
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112 modelList);
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113 doUpdate(modelList, cast(IObservableList) getTarget(), diff,
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114 modelToTarget, true, true);
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115 }
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116 });
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117 }
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118
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119 public void updateTargetToModel() {
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120 final IObservableList targetList = cast(IObservableList) getTarget();
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121 targetList.getRealm().exec(new class() Runnable {
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122 public void run() {
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123 ListDiff diff = Diffs.computeListDiff(Collections.EMPTY_LIST,
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124 targetList);
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125 doUpdate(targetList, cast(IObservableList) getModel(), diff,
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126 targetToModel, true, true);
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127 }
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128 });
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129 }
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130
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131 public void validateModelToTarget() {
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132 // nothing for now
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133 }
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134
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135 public void validateTargetToModel() {
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136 // nothing for now
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137 }
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138
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139 /*
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140 * This method may be moved to UpdateListStrategy in the future if clients
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141 * need more control over how the two lists are kept in sync.
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142 */
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143 private void doUpdate(IObservableList source,
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144 IObservableList destination, ListDiff diff,
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145 UpdateListStrategy updateListStrategy,
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146 bool explicit, bool clearDestination) {
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147 final int policy = updateListStrategy.getUpdatePolicy();
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148 if (policy !is UpdateListStrategy.POLICY_NEVER) {
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149 if (policy !is UpdateListStrategy.POLICY_ON_REQUEST || explicit) {
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150 destination.getRealm().exec(dgRunnable((
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151 IObservableList destination_,
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152 ListDiff diff_,
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153 UpdateListStrategy updateListStrategy_,
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154 bool clearDestination_) {
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155 if (destination_ is getTarget()) {
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156 updatingTarget = true;
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157 } else {
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158 updatingModel = true;
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159 }
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160 MultiStatus multiStatus = BindingStatus.ok();
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161
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162 try {
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163 if (clearDestination_) {
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164 destination_.clear();
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165 }
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166 ListDiffEntry[] diffEntries = diff_.getDifferences();
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167 for (int i = 0; i < diffEntries.length; i++) {
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168 ListDiffEntry listDiffEntry = diffEntries[i];
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169 if (listDiffEntry.isAddition()) {
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170 IStatus setterStatus = updateListStrategy_
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171 .doAdd(
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172 destination_,
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173 updateListStrategy_
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174 .convert(listDiffEntry
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175 .getElement()),
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176 listDiffEntry.getPosition());
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177
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178 mergeStatus(multiStatus, setterStatus);
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179 // TODO - at this point, the two lists
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180 // will be out of sync if an error occurred...
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181 } else {
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182 IStatus setterStatus = updateListStrategy_
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183 .doRemove(destination_,
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184 listDiffEntry.getPosition());
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185
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186 mergeStatus(multiStatus, setterStatus);
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187 // TODO - at this point, the two lists
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188 // will be out of sync if an error occurred...
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189 }
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190 }
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191 } finally {
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192 validationStatusObservable.setValue(multiStatus);
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193
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194 if (destination_ is getTarget()) {
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195 updatingTarget = false;
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196 } else {
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197 updatingModel = false;
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198 }
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199 }
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200 }, destination, diff, updateListStrategy, clearDestination));
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201 }
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202 }
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203 }
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204
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205 /**
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206 * Merges the provided <code>newStatus</code> into the
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207 * <code>multiStatus</code>.
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208 *
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209 * @param multiStatus
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210 * @param newStatus
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211 */
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212 /* package */void mergeStatus(MultiStatus multiStatus, IStatus newStatus) {
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213 if (!newStatus.isOK()) {
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214 multiStatus.add(newStatus);
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215 }
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216 }
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217
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218 public void dispose() {
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219 if (targetChangeListener !is null) {
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220 (cast(IObservableList)getTarget()).removeListChangeListener(targetChangeListener);
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221 targetChangeListener = null;
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222 }
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223 if (modelChangeListener !is null) {
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224 (cast(IObservableList)getModel()).removeListChangeListener(modelChangeListener);
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225 modelChangeListener = null;
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226 }
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227 super.dispose();
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228 }
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229 }
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