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1 /*******************************************************************************
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2 * Copyright (c) 2007, 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 * Bob Smith - bug 198880
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11 *******************************************************************************/
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12
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13 module org.eclipse.core.databinding.ObservablesManager;
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81
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14 import org.eclipse.core.databinding.DataBindingContext;
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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.HashMap;
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20 import java.util.HashSet;
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21 import java.util.Iterator;
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22 import java.util.Map;
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23 import java.util.Set;
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24
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25 import org.eclipse.core.databinding.observable.IObservable;
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26 import org.eclipse.core.internal.databinding.Pair;
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27
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28 /**
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29 * An observables manager can be used for lifecycle management of
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30 * {@link IObservable} objects.
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31 *
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32 * @noextend This class is not intended to be subclassed by clients.
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33 *
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34 * @since 1.0
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35 *
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36 */
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37 public class ObservablesManager {
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38
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39 private Set managedObservables = new HashSet();
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40 private Set excludedObservables = new HashSet();
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41 private Map contexts = new HashMap();
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42
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43 /**
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44 * Create a new observables manager.
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45 */
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46 public this() {
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47 }
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48
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49 /**
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50 * Adds the given observable to this manager.
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51 *
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52 * @param observable
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53 * the observable
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54 */
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55 public void addObservable(IObservable observable) {
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56 managedObservables.add(observable);
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57 }
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58
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59 /**
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60 * Adds the given observable to this manager's exclusion list. The given
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61 * observable will not be disposed of by this manager.
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62 *
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63 * @param observable
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64 * the observable
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65 */
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66 public void excludeObservable(IObservable observable) {
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67 excludedObservables.add(observable);
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68 }
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69
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70 /**
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71 * Adds the given data binding context's target and/or model observables to
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72 * this manager.
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73 *
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74 * @param context
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75 * the data binding context
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76 * @param trackTargets
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77 * <code>true</code> if the target observables of the context
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78 * should be managed
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79 * @param trackModels
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80 * <code>true</code> if the model observables of the context
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81 * should be managed
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82 */
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83 public void addObservablesFromContext(DataBindingContext context,
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84 bool trackTargets, bool trackModels) {
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85 if (trackTargets || trackModels) {
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86 contexts.put(context, new Pair(new Boolean(trackTargets),
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87 new Boolean(trackModels)));
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88 }
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89 }
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90
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91 /**
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92 * Disposes of this manager and all observables that it manages.
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93 */
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94 public void dispose() {
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95 Set observables = new HashSet();
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96 observables.addAll(managedObservables);
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97 for (Iterator it = contexts.keySet().iterator(); it.hasNext();) {
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98 DataBindingContext context = cast(DataBindingContext) it.next();
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99 Pair trackModelsOrTargets = cast(Pair) contexts.get(context);
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100 bool disposeTargets = (cast(Boolean) trackModelsOrTargets.a)
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101 .booleanValue();
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102 bool disposeModels = (cast(Boolean) trackModelsOrTargets.b)
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103 .booleanValue();
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104 for (Iterator it2 = context.getBindings().iterator(); it2.hasNext();) {
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105 Binding binding = cast(Binding) it2.next();
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106 if (disposeTargets) {
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107 observables.add(binding.getTarget());
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108 }
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109 if (disposeModels) {
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110 observables.add(binding.getModel());
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111 }
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112 }
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113 }
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114 observables.removeAll(excludedObservables);
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115 for (Iterator it = observables.iterator(); it.hasNext();) {
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116 IObservable observable = cast(IObservable) it.next();
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117 observable.dispose();
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118 }
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119 }
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120 }
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