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comparison org.eclipse.core.databinding/src/org/eclipse/core/databinding/observable/value/AbstractObservableValue.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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children 383ce7bd736b
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2006, 2008 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Brad Reynolds - bug 164653
11 * Matthew Hall - bug 208332
12 *******************************************************************************/
13
14 module org.eclipse.core.databinding.observable.value.AbstractObservableValue;
15
16 import java.lang.all;
17
18 import org.eclipse.core.databinding.observable.AbstractObservable;
19 import org.eclipse.core.databinding.observable.ObservableTracker;
20 import org.eclipse.core.databinding.observable.Realm;
21
22 /**
23 *
24 * <p>
25 * This class is thread safe. All state accessing methods must be invoked from
26 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
27 * listeners may be invoked from any thread.
28 * </p>
29 * @since 1.0
30 *
31 */
32 abstract public class AbstractObservableValue : AbstractObservable , IObservableValue {
33 /**
34 * Constructs a new instance with the default realm.
35 */
36 public this() {
37 this(Realm.getDefault());
38 }
39
40 /**
41 * @param realm
42 */
43 public this(Realm realm) {
44 super(realm);
45 }
46
47 public synchronized void addValueChangeListener(IValueChangeListener listener) {
48 addListener(ValueChangeEvent.TYPE, listener);
49 }
50
51 public synchronized void removeValueChangeListener(IValueChangeListener listener) {
52 removeListener(ValueChangeEvent.TYPE, listener);
53 }
54
55 final public void setValue(Object value) {
56 checkRealm();
57 doSetValue(value);
58 }
59
60 /**
61 * Template method for setting the value of the observable. By default the
62 * method throws an {@link UnsupportedOperationException}.
63 *
64 * @param value
65 */
66 protected void doSetValue(Object value) {
67 throw new UnsupportedOperationException();
68 }
69
70 protected void fireValueChange(ValueDiff diff) {
71 // fire general change event first
72 super.fireChange();
73 fireEvent(new ValueChangeEvent(this, diff));
74 }
75
76 public final Object getValue() {
77 getterCalled();
78 return doGetValue();
79 }
80
81 abstract protected Object doGetValue();
82
83 public bool isStale() {
84 getterCalled();
85 return false;
86 }
87
88 private void getterCalled() {
89 ObservableTracker.getterCalled(this);
90 }
91
92 protected void fireChange() {
93 throw new RuntimeException(
94 "fireChange should not be called, use fireValueChange() instead"); //$NON-NLS-1$
95 }
96
97 public synchronized void dispose() {
98 super.dispose();
99 }
100 }