Mercurial > projects > dwt2
annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/StalenessTracker.d @ 97:c86eb8b3098e
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author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:18:25 +0200 |
parents | b74ac5dfcc06 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2006 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.internal.databinding.observable.StalenessTracker; |
97 | 13 import org.eclipse.core.internal.databinding.observable.IStalenessConsumer; |
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14 |
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15 import java.lang.all; |
95
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16 |
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17 import java.util.HashMap; |
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18 import java.util.Map; |
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19 |
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20 import org.eclipse.core.databinding.observable.ChangeEvent; |
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21 import org.eclipse.core.databinding.observable.IChangeListener; |
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22 import org.eclipse.core.databinding.observable.IObservable; |
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23 import org.eclipse.core.databinding.observable.IStaleListener; |
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24 import org.eclipse.core.databinding.observable.StaleEvent; |
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25 import org.eclipse.core.internal.databinding.IdentityWrapper; |
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26 |
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27 /** |
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28 * @since 1.0 |
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29 * |
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30 */ |
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31 public class StalenessTracker { |
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32 |
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33 private Map staleMap = new HashMap(); |
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34 |
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35 private int staleCount = 0; |
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36 |
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37 private final IStalenessConsumer stalenessConsumer; |
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38 |
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39 private class ChildListener : IStaleListener, IChangeListener { |
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40 public void handleStale(StaleEvent event) { |
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41 processStalenessChange(cast(IObservable) event.getSource(), true); |
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42 } |
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43 |
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44 public void handleChange(ChangeEvent event) { |
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45 processStalenessChange(cast(IObservable) event.getSource(), true); |
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46 } |
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47 } |
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48 |
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49 private ChildListener childListener = new ChildListener(); |
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50 |
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51 /** |
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52 * @param observables |
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53 * @param stalenessConsumer |
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54 */ |
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55 public this(IObservable[] observables, |
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56 IStalenessConsumer stalenessConsumer) { |
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57 this.stalenessConsumer = stalenessConsumer; |
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58 for (int i = 0; i < observables.length; i++) { |
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59 IObservable observable = observables[i]; |
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60 doAddObservable(observable, false); |
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61 } |
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62 stalenessConsumer.setStale(staleCount > 0); |
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63 } |
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64 |
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65 /** |
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66 * @param child |
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67 * @param callback |
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68 */ |
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69 public void processStalenessChange(IObservable child, bool callback) { |
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70 bool oldStale = staleCount > 0; |
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71 IdentityWrapper wrappedChild = new IdentityWrapper(child); |
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72 bool oldChildStale = getOldChildStale(wrappedChild); |
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73 bool newChildStale = child.isStale(); |
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74 if (oldChildStale !is newChildStale) { |
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75 if (oldChildStale) { |
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76 staleCount--; |
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77 } else { |
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78 staleCount++; |
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79 } |
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80 staleMap.put(wrappedChild, newChildStale ? Boolean.TRUE : Boolean.FALSE); |
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81 } |
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82 bool newStale = staleCount > 0; |
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83 if (callback && (newStale !is oldStale)) { |
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84 stalenessConsumer.setStale(newStale); |
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85 } |
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86 } |
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87 |
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88 /** |
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89 * @param wrappedChild |
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90 */ |
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91 private bool getOldChildStale(IdentityWrapper wrappedChild) { |
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92 Object oldChildValue = staleMap.get(wrappedChild); |
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93 bool oldChildStale = oldChildValue is null ? false |
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94 : (cast(Boolean) oldChildValue).booleanValue(); |
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95 return oldChildStale; |
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96 } |
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97 |
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98 /** |
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99 * @param observable |
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100 */ |
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101 public void addObservable(IObservable observable) { |
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102 doAddObservable(observable, true); |
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103 } |
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104 |
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105 private void doAddObservable(IObservable observable, bool callback) { |
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106 processStalenessChange(observable, callback); |
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107 observable.addChangeListener(childListener); |
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108 observable.addStaleListener(childListener); |
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109 } |
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110 |
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111 /** |
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112 * @param observable |
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113 */ |
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114 public void removeObservable(IObservable observable) { |
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115 bool oldStale = staleCount > 0; |
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116 IdentityWrapper wrappedChild = new IdentityWrapper(observable); |
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117 bool oldChildStale = getOldChildStale(wrappedChild); |
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118 if (oldChildStale) { |
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119 staleCount--; |
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120 } |
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121 staleMap.remove(wrappedChild); |
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122 observable.removeChangeListener(childListener); |
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123 observable.removeStaleListener(childListener); |
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124 bool newStale = staleCount > 0; |
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125 if (newStale !is oldStale) { |
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126 stalenessConsumer.setStale(newStale); |
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127 } |
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128 } |
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129 |
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130 } |