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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/value/AbstractObservableValue.d @ 95:6208d4f6a277

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Added trees for databinding.beans and observable
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 10:55:51 +0200
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children b74ac5dfcc06
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 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 * Brad Reynolds - bug 164653
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11 * Matthew Hall - bug 208332
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12 *******************************************************************************/
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13
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14 package org.eclipse.core.databinding.observable.value;
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15
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16 import org.eclipse.core.databinding.observable.AbstractObservable;
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17 import org.eclipse.core.databinding.observable.ObservableTracker;
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18 import org.eclipse.core.databinding.observable.Realm;
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19
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20 /**
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21 *
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22 * <p>
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23 * This class is thread safe. All state accessing methods must be invoked from
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24 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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25 * listeners may be invoked from any thread.
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26 * </p>
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27 * @since 1.0
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28 *
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29 */
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30 abstract public class AbstractObservableValue : AbstractObservable , IObservableValue {
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31 /**
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32 * Constructs a new instance with the default realm.
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33 */
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34 public this() {
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35 this(Realm.getDefault());
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36 }
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37
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38 /**
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39 * @param realm
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40 */
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41 public this(Realm realm) {
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42 super(realm);
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43 }
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44
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45 public synchronized void addValueChangeListener(IValueChangeListener listener) {
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46 addListener(ValueChangeEvent.TYPE, listener);
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47 }
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48
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49 public synchronized void removeValueChangeListener(IValueChangeListener listener) {
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50 removeListener(ValueChangeEvent.TYPE, listener);
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51 }
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52
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53 final public void setValue(Object value) {
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54 checkRealm();
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55 doSetValue(value);
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56 }
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57
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58 /**
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59 * Template method for setting the value of the observable. By default the
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60 * method throws an {@link UnsupportedOperationException}.
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61 *
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62 * @param value
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63 */
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64 protected void doSetValue(Object value) {
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65 throw new UnsupportedOperationException();
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66 }
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67
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68 protected void fireValueChange(ValueDiff diff) {
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69 // fire general change event first
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70 super.fireChange();
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71 fireEvent(new ValueChangeEvent(this, diff));
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72 }
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73
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74 public final Object getValue() {
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75 getterCalled();
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76 return doGetValue();
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77 }
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78
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79 abstract protected Object doGetValue();
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80
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81 public bool isStale() {
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82 getterCalled();
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83 return false;
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84 }
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85
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86 private void getterCalled() {
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87 ObservableTracker.getterCalled(this);
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88 }
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89
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90 protected void fireChange() {
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91 throw new RuntimeException(
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92 "fireChange should not be called, use fireValueChange() instead"); //$NON-NLS-1$
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93 }
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94
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95 public synchronized void dispose() {
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96 super.dispose();
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97 }
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98 }