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1 /*******************************************************************************
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2 * Copyright (c) 2005-2008 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 * Matthew Hall - bug 221351
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11 *******************************************************************************/
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12 module org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableSet;
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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.Collection;
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17 import java.util.Collections;
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18 import java.util.HashSet;
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19 import java.util.Set;
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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.IObserving;
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23 import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
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24 import org.eclipse.core.databinding.observable.set.IObservableSet;
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25 import org.eclipse.core.databinding.observable.set.ISetChangeListener;
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26 import org.eclipse.core.databinding.observable.set.ObservableSet;
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27 import org.eclipse.core.databinding.observable.set.SetChangeEvent;
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28 import org.eclipse.core.databinding.observable.value.IObservableValue;
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29 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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30 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
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31 import org.eclipse.core.runtime.Assert;
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32
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33 /**
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34 * @since 3.2
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35 *
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36 */
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37 public class DetailObservableSet : ObservableSet , IObserving {
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38
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39 private bool updating = false;
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40
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41 private ISetChangeListener innerChangeListener = new class() ISetChangeListener {
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42 public void handleSetChange(SetChangeEvent event) {
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43 if (!updating) {
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44 fireSetChange(event.diff);
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45 }
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46 }
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47 };
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48
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49 private Object currentOuterValue;
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50
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51 private IObservableSet innerObservableSet;
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52
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53 private IObservableValue outerObservableValue;
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54
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55 private IObservableFactory factory;
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56
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57 /**
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58 * @param factory
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59 * @param outerObservableValue
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60 * @param detailType
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61 */
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62 public this(IObservableFactory factory,
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63 IObservableValue outerObservableValue, Object detailType) {
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64 super(outerObservableValue.getRealm(), Collections.EMPTY_SET,
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65 detailType);
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66 this.factory = factory;
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67 this.outerObservableValue = outerObservableValue;
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68 updateInnerObservableSet(outerObservableValue);
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69
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70 outerObservableValue.addValueChangeListener(outerChangeListener);
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71 }
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72
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73 IValueChangeListener outerChangeListener = new class() IValueChangeListener {
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74 public void handleValueChange(ValueChangeEvent event) {
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75 Set oldSet = new HashSet(wrappedSet);
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76 updateInnerObservableSet(outerObservableValue);
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77 fireSetChange(Diffs.computeSetDiff(oldSet, wrappedSet));
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78 }
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79 };
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80
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81 private void updateInnerObservableSet(IObservableValue outerObservableValue) {
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82 currentOuterValue = outerObservableValue.getValue();
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83 if (innerObservableSet !is null) {
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84 innerObservableSet.removeSetChangeListener(innerChangeListener);
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85 innerObservableSet.dispose();
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86 }
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87 if (currentOuterValue is null) {
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88 innerObservableSet = null;
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89 wrappedSet = Collections.EMPTY_SET;
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90 } else {
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91 this.innerObservableSet = cast(IObservableSet) factory
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92 .createObservable(currentOuterValue);
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93 wrappedSet = innerObservableSet;
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94
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95 if (elementType !is null) {
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96 Object innerValueType = innerObservableSet.getElementType();
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97
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98 Assert.isTrue(elementType.equals(innerValueType),
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99 "Cannot change value type in a nested observable set"); //$NON-NLS-1$
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100 }
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101
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102 innerObservableSet.addSetChangeListener(innerChangeListener);
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103 }
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104 }
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105
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106 public bool add(Object o) {
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107 getterCalled();
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108 return wrappedSet.add(o);
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109 }
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110
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111 public bool remove(Object o) {
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112 getterCalled();
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113 return wrappedSet.remove(o);
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114 }
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115
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116 public bool addAll(Collection c) {
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117 getterCalled();
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118 return wrappedSet.addAll(c);
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119 }
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120
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121 public bool removeAll(Collection c) {
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122 getterCalled();
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123 return wrappedSet.removeAll(c);
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124 }
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125
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126 public bool retainAll(Collection c) {
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127 getterCalled();
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128 return wrappedSet.retainAll(c);
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129 }
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130
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131 public void clear() {
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132 getterCalled();
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133 wrappedSet.clear();
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134 }
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135
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136 public void dispose() {
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137 super.dispose();
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138
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139 if (outerObservableValue !is null) {
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140 outerObservableValue.removeValueChangeListener(outerChangeListener);
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141 outerObservableValue.dispose();
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142 }
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143 if (innerObservableSet !is null) {
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144 innerObservableSet.removeSetChangeListener(innerChangeListener);
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145 innerObservableSet.dispose();
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146 }
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147 currentOuterValue = null;
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148 factory = null;
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149 innerObservableSet = null;
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150 innerChangeListener = null;
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151 }
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152
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153 public Object getObserved() {
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154 if ( null !is cast(IObserving)innerObservableSet ) {
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155 return (cast(IObserving) innerObservableSet).getObserved();
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156 }
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157 return null;
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158 }
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159
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160 }
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