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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 module org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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81
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15 import org.eclipse.core.databinding.observable.value.ValueDiff;
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16 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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17 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
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18 import org.eclipse.core.databinding.observable.value.IObservableValue;
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78
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19
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20 import java.lang.all;
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21
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22 import org.eclipse.core.databinding.observable.AbstractObservable;
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23 import org.eclipse.core.databinding.observable.ObservableTracker;
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24 import org.eclipse.core.databinding.observable.Realm;
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25
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26 /**
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27 *
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28 * <p>
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29 * This class is thread safe. All state accessing methods must be invoked from
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30 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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31 * listeners may be invoked from any thread.
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32 * </p>
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33 * @since 1.0
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34 *
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35 */
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36 abstract public class AbstractObservableValue : AbstractObservable , IObservableValue {
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37 /**
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38 * Constructs a new instance with the default realm.
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39 */
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40 public this() {
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41 this(Realm.getDefault());
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42 }
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43
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44 /**
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45 * @param realm
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46 */
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47 public this(Realm realm) {
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48 super(realm);
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49 }
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50
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51 public synchronized void addValueChangeListener(IValueChangeListener listener) {
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52 addListener(ValueChangeEvent.TYPE, listener);
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53 }
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54
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55 public synchronized void removeValueChangeListener(IValueChangeListener listener) {
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56 removeListener(ValueChangeEvent.TYPE, listener);
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57 }
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58
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59 final public void setValue(Object value) {
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60 checkRealm();
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61 doSetValue(value);
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62 }
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63
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64 /**
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65 * Template method for setting the value of the observable. By default the
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66 * method throws an {@link UnsupportedOperationException}.
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67 *
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68 * @param value
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69 */
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70 protected void doSetValue(Object value) {
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71 throw new UnsupportedOperationException();
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72 }
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73
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74 protected void fireValueChange(ValueDiff diff) {
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75 // fire general change event first
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76 super.fireChange();
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77 fireEvent(new ValueChangeEvent(this, diff));
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78 }
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79
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80 public final Object getValue() {
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81 getterCalled();
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82 return doGetValue();
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83 }
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84
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85 abstract protected Object doGetValue();
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86
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87 public bool isStale() {
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88 getterCalled();
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89 return false;
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90 }
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91
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92 private void getterCalled() {
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93 ObservableTracker.getterCalled(this);
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94 }
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95
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96 protected void fireChange() {
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97 throw new RuntimeException(
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98 "fireChange should not be called, use fireValueChange() instead"); //$NON-NLS-1$
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99 }
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100
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101 public synchronized void dispose() {
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102 super.dispose();
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103 }
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104 }
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