Mercurial > projects > dwt2
annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/IObservable.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 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2005, 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 *******************************************************************************/ |
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11 module org.eclipse.core.databinding.observable.IObservable; |
97 | 12 import org.eclipse.core.databinding.observable.IChangeListener; |
13 import org.eclipse.core.databinding.observable.Realm; | |
14 import org.eclipse.core.databinding.observable.IStaleListener; | |
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15 |
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16 import java.lang.all; |
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17 |
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18 /** |
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19 * An object with state that allows to listen for state changes. |
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20 * |
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21 * <p> |
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22 * Implementations must not manage listeners themselves, listener management |
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23 * must be delegated to a private instance of type {@link ChangeSupport} if it |
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24 * is not inherited from {@link AbstractObservable}. |
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25 * </p> |
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26 * |
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27 * @noextend This interface is not intended to be extended by clients. |
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28 * @noimplement This interface is not intended to be implemented by clients. |
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29 * Clients should instead subclass one of the classes in the |
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30 * framework that implement this interface. Note that direct |
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31 * implementers of this interface outside of the framework will be |
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32 * broken in future releases when methods are added to this |
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33 * interface. |
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34 * |
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35 * @since 1.0 |
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36 * |
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37 */ |
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38 public interface IObservable { |
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39 |
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40 /** |
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41 * Returns the realm for this observable. Unless otherwise specified, |
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42 * getters and setters must be accessed from within this realm. Listeners |
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43 * will be within this realm when they receive events from this observable. |
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44 * <p> |
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45 * Because observables can only be accessed from within one realm, and they |
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46 * always fire events on that realm, their state can be observed in an |
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47 * incremental way. It is always safe to call getters of an observable from |
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48 * within a change listener attached to that observable. |
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49 * </p> |
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50 * |
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51 * @return the realm |
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52 */ |
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53 public Realm getRealm(); |
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54 |
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55 /** |
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56 * Adds the given change listener to the list of change listeners. Change |
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57 * listeners are notified about changes of the state of this observable in a |
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58 * generic way, without specifying the change that happened. To get the |
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59 * changed state, a change listener needs to query for the current state of |
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60 * this observable. |
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61 * |
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62 * @param listener |
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63 */ |
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64 public void addChangeListener(IChangeListener listener); |
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65 |
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66 /** |
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67 * Removes the given change listener from the list of change listeners. Has |
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68 * no effect if the given listener is not registered as a change listener. |
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69 * |
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70 * @param listener |
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71 */ |
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72 public void removeChangeListener(IChangeListener listener); |
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73 |
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74 /** |
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75 * Adds the given stale listener to the list of stale listeners. Stale |
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76 * listeners are notified when an observable object becomes stale, not when |
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77 * is becomes non-stale. |
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78 * |
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79 * @param listener |
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80 * |
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81 * @see #isStale() |
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82 */ |
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83 public void addStaleListener(IStaleListener listener); |
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84 |
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85 /** |
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86 * Removes the given stale listener from the list of stale listeners. Has no |
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87 * effect if the given listener is not registered as a stale listener. |
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88 * |
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89 * @param listener |
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90 */ |
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91 public void removeStaleListener(IStaleListener listener); |
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92 |
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93 /** |
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94 * Returns whether the state of this observable is stale and is expected to |
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95 * change soon. A non-stale observable that becomes stale will notify its |
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96 * stale listeners. A stale object that becomes non-stale does so by |
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97 * changing its state and notifying its change listeners, it does <b>not</b> |
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98 * notify its stale listeners about becoming non-stale. Clients that do not |
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99 * expect asynchronous changes may ignore staleness of observable objects. |
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100 * |
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101 * @return true if this observable's state is stale and will change soon. |
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102 * |
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103 * @TrackedGetter - implementers must call |
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104 * {@link ObservableTracker#getterCalledcast(IObservable)}. |
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105 */ |
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106 public bool isStale(); |
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107 |
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108 /** |
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109 * Disposes of this observable object, removing all listeners registered |
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110 * with this object, and all listeners this object might have registered on |
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111 * other objects. |
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112 */ |
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113 public void dispose(); |
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114 } |