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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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14
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15 import java.lang.all;
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16
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17 import java.util.HashMap;
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18 import java.util.HashSet;
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19 import java.util.Iterator;
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20 import java.util.Map;
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21 import java.util.Set;
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22
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23 import org.eclipse.core.databinding.observable.IObservable;
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24 import org.eclipse.core.internal.databinding.Pair;
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25
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26 /**
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27 * An observables manager can be used for lifecycle management of
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28 * {@link IObservable} objects.
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29 *
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30 * @noextend This class is not intended to be subclassed by clients.
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31 *
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32 * @since 1.0
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33 *
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34 */
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35 public class ObservablesManager {
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36
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37 private Set managedObservables = new HashSet();
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38 private Set excludedObservables = new HashSet();
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39 private Map contexts = new HashMap();
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40
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41 /**
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42 * Create a new observables manager.
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43 */
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44 public this() {
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45 }
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46
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47 /**
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48 * Adds the given observable to this manager.
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49 *
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50 * @param observable
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51 * the observable
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52 */
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53 public void addObservable(IObservable observable) {
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54 managedObservables.add(observable);
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55 }
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56
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57 /**
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58 * Adds the given observable to this manager's exclusion list. The given
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59 * observable will not be disposed of by this manager.
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60 *
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61 * @param observable
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62 * the observable
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63 */
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64 public void excludeObservable(IObservable observable) {
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65 excludedObservables.add(observable);
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66 }
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67
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68 /**
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69 * Adds the given data binding context's target and/or model observables to
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70 * this manager.
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71 *
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72 * @param context
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73 * the data binding context
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74 * @param trackTargets
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75 * <code>true</code> if the target observables of the context
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76 * should be managed
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77 * @param trackModels
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78 * <code>true</code> if the model observables of the context
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79 * should be managed
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80 */
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81 public void addObservablesFromContext(DataBindingContext context,
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82 bool trackTargets, bool trackModels) {
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83 if (trackTargets || trackModels) {
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84 contexts.put(context, new Pair(new Boolean(trackTargets),
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85 new Boolean(trackModels)));
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86 }
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87 }
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88
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89 /**
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90 * Disposes of this manager and all observables that it manages.
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91 */
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92 public void dispose() {
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93 Set observables = new HashSet();
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94 observables.addAll(managedObservables);
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95 for (Iterator it = contexts.keySet().iterator(); it.hasNext();) {
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96 DataBindingContext context = cast(DataBindingContext) it.next();
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97 Pair trackModelsOrTargets = cast(Pair) contexts.get(context);
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98 bool disposeTargets = (cast(Boolean) trackModelsOrTargets.a)
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99 .booleanValue();
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100 bool disposeModels = (cast(Boolean) trackModelsOrTargets.b)
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101 .booleanValue();
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102 for (Iterator it2 = context.getBindings().iterator(); it2.hasNext();) {
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103 Binding binding = cast(Binding) it2.next();
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104 if (disposeTargets) {
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105 observables.add(binding.getTarget());
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106 }
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107 if (disposeModels) {
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108 observables.add(binding.getModel());
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109 }
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110 }
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111 }
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112 observables.removeAll(excludedObservables);
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113 for (Iterator it = observables.iterator(); it.hasNext();) {
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114 IObservable observable = cast(IObservable) it.next();
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115 observable.dispose();
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116 }
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117 }
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118 }
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