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1 /*******************************************************************************
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2 * Copyright (c) 2005, 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 * Brad Reynolds - bug 164653
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11 * Brad Reynolds - bug 147515
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12 *******************************************************************************/
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13 module org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue;
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.core.databinding.observable.Diffs;
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18 import org.eclipse.core.databinding.observable.IObserving;
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19 import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
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20 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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21 import org.eclipse.core.databinding.observable.value.IObservableValue;
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22 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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23 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
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24 import org.eclipse.core.runtime.Assert;
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25
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26 /**
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27 * @since 1.0
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28 *
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29 */
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30 public class DetailObservableValue : AbstractObservableValue , IObserving {
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31
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32 private bool updating = false;
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33
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34 private IValueChangeListener innerChangeListener = new class() IValueChangeListener {
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35 public void handleValueChange(ValueChangeEvent event) {
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36 if (!updating) {
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37 fireValueChange(event.diff);
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38 }
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39 }
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40 };
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41
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42 private Object currentOuterValue;
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43
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44 private IObservableValue innerObservableValue;
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45
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46 private Object detailType;
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47
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48 private IObservableValue outerObservableValue;
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49
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50 private IObservableFactory factory;
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51
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52 /**
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53 * @param outerObservableValue
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54 * @param factory
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55 * @param detailType
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56 */
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57 public this(IObservableValue outerObservableValue,
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58 IObservableFactory factory, Object detailType) {
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59 super(outerObservableValue.getRealm());
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60 this.factory = factory;
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61 this.detailType = detailType;
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62 this.outerObservableValue = outerObservableValue;
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63 updateInnerObservableValue(outerObservableValue);
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64
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65 outerObservableValue.addValueChangeListener(outerChangeListener);
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66 }
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67
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68 IValueChangeListener outerChangeListener = new class() IValueChangeListener {
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69 public void handleValueChange(ValueChangeEvent event) {
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70 Object oldValue = doGetValue();
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71 updateInnerObservableValue(outerObservableValue);
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72 fireValueChange(Diffs.createValueDiff(oldValue, doGetValue()));
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73 }
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74 };
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75
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76 private void updateInnerObservableValue(
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77 IObservableValue outerObservableValue) {
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78 currentOuterValue = outerObservableValue.getValue();
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79 if (innerObservableValue !is null) {
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80 innerObservableValue.removeValueChangeListener(innerChangeListener);
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81 innerObservableValue.dispose();
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82 }
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83 if (currentOuterValue is null) {
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84 innerObservableValue = null;
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85 } else {
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86 this.innerObservableValue = cast(IObservableValue) factory
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87 .createObservable(currentOuterValue);
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88 Object innerValueType = innerObservableValue.getValueType();
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89
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90 if (detailType !is null) {
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91 Assert
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92 .isTrue(
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93 detailType.equals(innerValueType),
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94 "Cannot change value type in a nested observable value, from " + innerValueType + " to " + detailType); //$NON-NLS-1$ //$NON-NLS-2$
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95 }
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96 innerObservableValue.addValueChangeListener(innerChangeListener);
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97 }
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98 }
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99
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100 public void doSetValue(Object value) {
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101 if (innerObservableValue !is null)
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102 innerObservableValue.setValue(value);
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103 }
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104
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105 public Object doGetValue() {
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106 return innerObservableValue is null ? null : innerObservableValue
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107 .getValue();
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108 }
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109
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110 public Object getValueType() {
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111 return detailType;
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112 }
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113
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114 public void dispose() {
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115 super.dispose();
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116
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117 if (outerObservableValue !is null) {
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118 outerObservableValue.removeValueChangeListener(outerChangeListener);
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119 outerObservableValue.dispose();
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120 }
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121 if (innerObservableValue !is null) {
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122 innerObservableValue.removeValueChangeListener(innerChangeListener);
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123 innerObservableValue.dispose();
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124 }
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125 currentOuterValue = null;
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126 factory = null;
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127 innerObservableValue = null;
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128 innerChangeListener = null;
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129 }
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130
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131 public Object getObserved() {
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132 if ( null !is cast(IObserving)innerObservableValue ) {
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133 return (cast(IObserving)innerObservableValue).getObserved();
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134 }
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135 return null;
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136 }
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137
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138 }
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