Mercurial > projects > dwt2
annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/internal/databinding/observable/StalenessTracker.d @ 96:b74ac5dfcc06
package to module and java.lang.all import
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:03:33 +0200 |
parents | 6208d4f6a277 |
children | c86eb8b3098e |
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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; |
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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.HashMap; |
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17 import java.util.Map; |
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18 |
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19 import org.eclipse.core.databinding.observable.ChangeEvent; |
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20 import org.eclipse.core.databinding.observable.IChangeListener; |
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21 import org.eclipse.core.databinding.observable.IObservable; |
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22 import org.eclipse.core.databinding.observable.IStaleListener; |
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23 import org.eclipse.core.databinding.observable.StaleEvent; |
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24 import org.eclipse.core.internal.databinding.IdentityWrapper; |
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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 StalenessTracker { |
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31 |
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32 private Map staleMap = new HashMap(); |
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33 |
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34 private int staleCount = 0; |
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35 |
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36 private final IStalenessConsumer stalenessConsumer; |
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37 |
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38 private class ChildListener : IStaleListener, IChangeListener { |
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39 public void handleStale(StaleEvent event) { |
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40 processStalenessChange(cast(IObservable) event.getSource(), true); |
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41 } |
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42 |
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43 public void handleChange(ChangeEvent event) { |
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44 processStalenessChange(cast(IObservable) event.getSource(), true); |
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45 } |
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46 } |
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47 |
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48 private ChildListener childListener = new ChildListener(); |
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49 |
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50 /** |
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51 * @param observables |
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52 * @param stalenessConsumer |
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53 */ |
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54 public this(IObservable[] observables, |
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55 IStalenessConsumer stalenessConsumer) { |
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56 this.stalenessConsumer = stalenessConsumer; |
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57 for (int i = 0; i < observables.length; i++) { |
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58 IObservable observable = observables[i]; |
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59 doAddObservable(observable, false); |
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60 } |
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61 stalenessConsumer.setStale(staleCount > 0); |
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62 } |
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63 |
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64 /** |
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65 * @param child |
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66 * @param callback |
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67 */ |
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68 public void processStalenessChange(IObservable child, bool callback) { |
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69 bool oldStale = staleCount > 0; |
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70 IdentityWrapper wrappedChild = new IdentityWrapper(child); |
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71 bool oldChildStale = getOldChildStale(wrappedChild); |
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72 bool newChildStale = child.isStale(); |
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73 if (oldChildStale !is newChildStale) { |
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74 if (oldChildStale) { |
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75 staleCount--; |
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76 } else { |
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77 staleCount++; |
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78 } |
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79 staleMap.put(wrappedChild, newChildStale ? Boolean.TRUE : Boolean.FALSE); |
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80 } |
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81 bool newStale = staleCount > 0; |
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82 if (callback && (newStale !is oldStale)) { |
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83 stalenessConsumer.setStale(newStale); |
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84 } |
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85 } |
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86 |
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87 /** |
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88 * @param wrappedChild |
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89 */ |
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90 private bool getOldChildStale(IdentityWrapper wrappedChild) { |
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91 Object oldChildValue = staleMap.get(wrappedChild); |
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92 bool oldChildStale = oldChildValue is null ? false |
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93 : (cast(Boolean) oldChildValue).booleanValue(); |
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94 return oldChildStale; |
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95 } |
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96 |
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97 /** |
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98 * @param observable |
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99 */ |
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100 public void addObservable(IObservable observable) { |
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101 doAddObservable(observable, true); |
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102 } |
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103 |
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104 private void doAddObservable(IObservable observable, bool callback) { |
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105 processStalenessChange(observable, callback); |
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106 observable.addChangeListener(childListener); |
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107 observable.addStaleListener(childListener); |
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108 } |
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109 |
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110 /** |
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111 * @param observable |
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112 */ |
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113 public void removeObservable(IObservable observable) { |
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114 bool oldStale = staleCount > 0; |
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115 IdentityWrapper wrappedChild = new IdentityWrapper(observable); |
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116 bool oldChildStale = getOldChildStale(wrappedChild); |
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117 if (oldChildStale) { |
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118 staleCount--; |
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119 } |
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120 staleMap.remove(wrappedChild); |
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121 observable.removeChangeListener(childListener); |
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122 observable.removeStaleListener(childListener); |
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123 bool newStale = staleCount > 0; |
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124 if (newStale !is oldStale) { |
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125 stalenessConsumer.setStale(newStale); |
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126 } |
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127 } |
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128 |
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129 } |