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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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85
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46 private IListChangeListener targetChangeListener;
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47 private class TargetChangeListener : IListChangeListener {
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78
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48 public void handleListChange(ListChangeEvent event) {
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49 if (!updatingTarget) {
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50 doUpdate(cast(IObservableList) getTarget(),
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51 cast(IObservableList) getModel(), event.diff,
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52 targetToModel, false, false);
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53 }
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54 }
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85
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55 }
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56 private IListChangeListener modelChangeListener;
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57 class ModelChangeListener : IListChangeListener {
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78
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58 public void handleListChange(ListChangeEvent event) {
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59 if (!updatingModel) {
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60 doUpdate(cast(IObservableList) getModel(),
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61 cast(IObservableList) getTarget(), event.diff,
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62 modelToTarget, false, false);
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63 }
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64 }
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65 };
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66
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67 /**
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68 * @param target
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69 * @param model
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70 * @param modelToTargetStrategy
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71 * @param targetToModelStrategy
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72 */
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73 public this(IObservableList target, IObservableList model,
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74 UpdateListStrategy targetToModelStrategy,
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75 UpdateListStrategy modelToTargetStrategy) {
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85
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76 targetChangeListener = new TargetChangeListener();
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77 modelChangeListener = new ModelChangeListener();
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78
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78 super(target, model);
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79 this.targetToModel = targetToModelStrategy;
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80 this.modelToTarget = modelToTargetStrategy;
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81 if ((targetToModel.getUpdatePolicy() & UpdateValueStrategy.POLICY_UPDATE) !is 0) {
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82 target.addListChangeListener(targetChangeListener);
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83 } else {
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84 targetChangeListener = null;
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85 }
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86 if ((modelToTarget.getUpdatePolicy() & UpdateValueStrategy.POLICY_UPDATE) !is 0) {
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87 model.addListChangeListener(modelChangeListener);
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88 } else {
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89 modelChangeListener = null;
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90 }
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91 }
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92
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93 public IObservableValue getValidationStatus() {
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94 return validationStatusObservable;
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95 }
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96
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97 protected void preInit() {
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98 validationStatusObservable = new WritableValue(context
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85
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99 .getValidationRealm(), cast(Object)Status.OK_STATUS, typeid(IStatus));
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78
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100 }
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101
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102 protected void postInit() {
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103 if (modelToTarget.getUpdatePolicy() is UpdateListStrategy.POLICY_UPDATE) {
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104 updateModelToTarget();
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105 }
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106 if (targetToModel.getUpdatePolicy() !is UpdateListStrategy.POLICY_NEVER) {
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107 validateTargetToModel();
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108 }
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109 }
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110
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111 public void updateModelToTarget() {
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112 final IObservableList modelList = cast(IObservableList) getModel();
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113 modelList.getRealm().exec(new class() Runnable {
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114 public void run() {
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115 ListDiff diff = Diffs.computeListDiff(Collections.EMPTY_LIST,
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116 modelList);
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117 doUpdate(modelList, cast(IObservableList) getTarget(), diff,
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118 modelToTarget, true, true);
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119 }
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120 });
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121 }
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122
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123 public void updateTargetToModel() {
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124 final IObservableList targetList = cast(IObservableList) getTarget();
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125 targetList.getRealm().exec(new class() Runnable {
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126 public void run() {
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127 ListDiff diff = Diffs.computeListDiff(Collections.EMPTY_LIST,
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128 targetList);
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129 doUpdate(targetList, cast(IObservableList) getModel(), diff,
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130 targetToModel, true, true);
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131 }
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132 });
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133 }
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134
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135 public void validateModelToTarget() {
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136 // nothing for now
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137 }
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138
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139 public void validateTargetToModel() {
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140 // nothing for now
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141 }
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142
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143 /*
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144 * This method may be moved to UpdateListStrategy in the future if clients
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145 * need more control over how the two lists are kept in sync.
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146 */
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147 private void doUpdate(IObservableList source,
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148 IObservableList destination, ListDiff diff,
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149 UpdateListStrategy updateListStrategy,
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150 bool explicit, bool clearDestination) {
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151 final int policy = updateListStrategy.getUpdatePolicy();
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152 if (policy !is UpdateListStrategy.POLICY_NEVER) {
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153 if (policy !is UpdateListStrategy.POLICY_ON_REQUEST || explicit) {
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154 destination.getRealm().exec(dgRunnable((
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155 IObservableList destination_,
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156 ListDiff diff_,
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157 UpdateListStrategy updateListStrategy_,
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158 bool clearDestination_) {
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159 if (destination_ is getTarget()) {
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160 updatingTarget = true;
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161 } else {
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162 updatingModel = true;
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163 }
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164 MultiStatus multiStatus = BindingStatus.ok();
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165
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166 try {
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167 if (clearDestination_) {
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168 destination_.clear();
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169 }
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170 ListDiffEntry[] diffEntries = diff_.getDifferences();
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171 for (int i = 0; i < diffEntries.length; i++) {
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172 ListDiffEntry listDiffEntry = diffEntries[i];
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173 if (listDiffEntry.isAddition()) {
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174 IStatus setterStatus = updateListStrategy_
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175 .doAdd_package(
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176 destination_,
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177 updateListStrategy_
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178 .convert(listDiffEntry
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179 .getElement()),
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180 listDiffEntry.getPosition());
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181
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182 mergeStatus(multiStatus, setterStatus);
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183 // TODO - at this point, the two lists
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184 // will be out of sync if an error occurred...
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185 } else {
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186 IStatus setterStatus = updateListStrategy_
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187 .doRemove_package(destination_,
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188 listDiffEntry.getPosition());
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189
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190 mergeStatus(multiStatus, setterStatus);
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191 // TODO - at this point, the two lists
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192 // will be out of sync if an error occurred...
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193 }
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194 }
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195 } finally {
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196 validationStatusObservable.setValue(multiStatus);
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197
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198 if (destination_ is getTarget()) {
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199 updatingTarget = false;
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200 } else {
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201 updatingModel = false;
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202 }
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203 }
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204 }, destination, diff, updateListStrategy, clearDestination));
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205 }
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206 }
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207 }
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208
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209 /**
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210 * Merges the provided <code>newStatus</code> into the
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211 * <code>multiStatus</code>.
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212 *
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213 * @param multiStatus
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214 * @param newStatus
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215 */
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216 /* package */void mergeStatus(MultiStatus multiStatus, IStatus newStatus) {
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217 if (!newStatus.isOK()) {
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218 multiStatus.add(newStatus);
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219 }
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220 }
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221
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222 public void dispose() {
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223 if (targetChangeListener !is null) {
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224 (cast(IObservableList)getTarget()).removeListChangeListener(targetChangeListener);
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225 targetChangeListener = null;
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226 }
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227 if (modelChangeListener !is null) {
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228 (cast(IObservableList)getModel()).removeListChangeListener(modelChangeListener);
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229 modelChangeListener = null;
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230 }
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231 super.dispose();
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232 }
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233 }
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