Mercurial > projects > dwt2
annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/value/ComputedValue.d @ 97:c86eb8b3098e
packageimport
author | Frank Benoit <benoit@tionex.de> |
---|---|
date | Tue, 21 Apr 2009 11:18:25 +0200 |
parents | b74ac5dfcc06 |
children |
rev | line source |
---|---|
95
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
1 /******************************************************************************* |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
2 * Copyright (c) 2005, 2008 IBM Corporation and others. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
3 * All rights reserved. This program and the accompanying materials |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
4 * are made available under the terms of the Eclipse Public License v1.0 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
5 * which accompanies this distribution, and is available at |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
6 * http://www.eclipse.org/legal/epl-v10.html |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
7 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
8 * Contributors: |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
9 * IBM Corporation - initial API and implementation |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
10 * Brad Reynolds - bug 116920 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
11 * Brad Reynolds - bug 147515 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
12 *******************************************************************************/ |
96
b74ac5dfcc06
package to module and java.lang.all import
Frank Benoit <benoit@tionex.de>
parents:
95
diff
changeset
|
13 module org.eclipse.core.databinding.observable.value.ComputedValue; |
97 | 14 import org.eclipse.core.databinding.observable.value.ValueDiff; |
15 import org.eclipse.core.databinding.observable.value.AbstractObservableValue; | |
16 import org.eclipse.core.databinding.observable.value.IValueChangeListener; | |
96
b74ac5dfcc06
package to module and java.lang.all import
Frank Benoit <benoit@tionex.de>
parents:
95
diff
changeset
|
17 |
b74ac5dfcc06
package to module and java.lang.all import
Frank Benoit <benoit@tionex.de>
parents:
95
diff
changeset
|
18 import java.lang.all; |
95
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
19 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
20 import org.eclipse.core.databinding.observable.ChangeEvent; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
21 import org.eclipse.core.databinding.observable.IChangeListener; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
22 import org.eclipse.core.databinding.observable.IObservable; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
23 import org.eclipse.core.databinding.observable.IStaleListener; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
24 import org.eclipse.core.databinding.observable.ObservableTracker; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
25 import org.eclipse.core.databinding.observable.Realm; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
26 import org.eclipse.core.databinding.observable.StaleEvent; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
27 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
28 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
29 * A Lazily calculated value that automatically computes and registers listeners |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
30 * on its dependencies as long as all of its dependencies are IObservable |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
31 * objects |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
32 * <p> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
33 * This class is thread safe. All state accessing methods must be invoked from |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
34 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
35 * listeners may be invoked from any thread. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
36 * </p> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
37 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
38 * @since 1.0 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
39 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
40 public abstract class ComputedValue : AbstractObservableValue { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
41 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
42 private bool dirty = true; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
43 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
44 private bool stale = false; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
45 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
46 private Object cachedValue = null; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
47 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
48 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
49 * Array of observables this computed value depends on. This field has a |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
50 * value of <code>null</code> if we are not currently listening. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
51 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
52 private IObservable[] dependencies = null; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
53 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
54 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
55 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
56 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
57 public this() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
58 this(Realm.getDefault(), null); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
59 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
60 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
61 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
62 * @param valueType |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
63 * can be <code>null</code> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
64 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
65 public this(Object valueType) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
66 this(Realm.getDefault(), valueType); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
67 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
68 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
69 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
70 * @param realm |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
71 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
72 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
73 public this(Realm realm) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
74 this(realm, null); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
75 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
76 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
77 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
78 * @param realm |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
79 * @param valueType |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
80 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
81 public this(Realm realm, Object valueType) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
82 super(realm); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
83 this.valueType = valueType; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
84 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
85 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
86 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
87 * Inner class that implements interfaces that we don't want to expose as |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
88 * public API. Each interface could have been implemented using a separate |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
89 * anonymous class, but we combine them here to reduce the memory overhead |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
90 * and number of classes. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
91 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
92 * <p> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
93 * The Runnable calls computeValue and stores the result in cachedValue. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
94 * </p> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
95 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
96 * <p> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
97 * The IChangeListener stores each observable in the dependencies list. This |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
98 * is registered as the listener when calling ObservableTracker, to detect |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
99 * every observable that is used by computeValue. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
100 * </p> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
101 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
102 * <p> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
103 * The IChangeListener is attached to every dependency. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
104 * </p> |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
105 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
106 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
107 private class PrivateInterface : Runnable, IChangeListener, |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
108 IStaleListener { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
109 public void run() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
110 cachedValue = calculate(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
111 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
112 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
113 public void handleStale(StaleEvent event) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
114 if (!dirty && !stale) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
115 stale = true; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
116 fireStale(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
117 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
118 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
119 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
120 public void handleChange(ChangeEvent event) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
121 makeDirty(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
122 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
123 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
124 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
125 private PrivateInterface privateInterface = new PrivateInterface(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
126 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
127 private Object valueType; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
128 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
129 protected final Object doGetValue() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
130 if (dirty) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
131 // This line will do the following: |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
132 // - Run the calculate method |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
133 // - While doing so, add any observable that is touched to the |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
134 // dependencies list |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
135 IObservable[] newDependencies = ObservableTracker.runAndMonitor( |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
136 privateInterface, privateInterface, null); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
137 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
138 stale = false; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
139 for (int i = 0; i < newDependencies.length; i++) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
140 IObservable observable = newDependencies[i]; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
141 // Add a change listener to the new dependency. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
142 if (observable.isStale()) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
143 stale = true; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
144 } else { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
145 observable.addStaleListener(privateInterface); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
146 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
147 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
148 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
149 dependencies = newDependencies; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
150 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
151 dirty = false; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
152 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
153 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
154 return cachedValue; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
155 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
156 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
157 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
158 * Subclasses must override this method to provide the object's value. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
159 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
160 * @return the object's value |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
161 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
162 protected abstract Object calculate(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
163 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
164 protected final void makeDirty() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
165 if (!dirty) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
166 dirty = true; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
167 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
168 stopListening(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
169 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
170 // copy the old value |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
171 final Object oldValue = cachedValue; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
172 // Fire the "dirty" event. This implementation recomputes the new |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
173 // value lazily. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
174 fireValueChange(new class() ValueDiff { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
175 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
176 public Object getOldValue() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
177 return oldValue; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
178 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
179 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
180 public Object getNewValue() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
181 return getValue(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
182 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
183 }); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
184 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
185 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
186 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
187 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
188 * |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
189 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
190 private void stopListening() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
191 // Stop listening for dependency changes. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
192 if (dependencies !is null) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
193 for (int i = 0; i < dependencies.length; i++) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
194 IObservable observable = dependencies[i]; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
195 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
196 observable.removeChangeListener(privateInterface); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
197 observable.removeStaleListener(privateInterface); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
198 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
199 dependencies = null; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
200 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
201 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
202 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
203 public bool isStale() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
204 // we need to recompute, otherwise staleness wouldn't mean anything |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
205 getValue(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
206 return stale; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
207 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
208 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
209 public Object getValueType() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
210 return valueType; |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
211 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
212 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
213 // this method exists here so that we can call it from the runnable below. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
214 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
215 * @since 1.1 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
216 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
217 protected bool hasListeners() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
218 return super.hasListeners(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
219 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
220 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
221 public synchronized void addChangeListener(IChangeListener listener) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
222 super.addChangeListener(listener); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
223 // If somebody is listening, we need to make sure we attach our own |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
224 // listeners |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
225 computeValueForListeners(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
226 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
227 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
228 /** |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
229 * Some clients just add a listener and expect to get notified even if they |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
230 * never called getValue(), so we have to call getValue() ourselves here to |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
231 * be sure. Need to be careful about realms though, this method can be |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
232 * called outside of our realm. See also bug 198211. If a client calls this |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
233 * outside of our realm, they may receive change notifications before the |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
234 * runnable below has been executed. It is their job to figure out what to |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
235 * do with those notifications. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
236 */ |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
237 private void computeValueForListeners() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
238 getRealm().exec(new class() Runnable { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
239 public void run() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
240 if (dependencies is null) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
241 // We are not currently listening. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
242 if (hasListeners()) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
243 // But someone is listening for changes. Call getValue() |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
244 // to make sure we start listening to the observables we |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
245 // depend on. |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
246 getValue(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
247 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
248 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
249 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
250 }); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
251 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
252 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
253 public synchronized void addValueChangeListener( |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
254 IValueChangeListener listener) { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
255 super.addValueChangeListener(listener); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
256 // If somebody is listening, we need to make sure we attach our own |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
257 // listeners |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
258 computeValueForListeners(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
259 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
260 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
261 public synchronized void dispose() { |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
262 super.dispose(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
263 stopListening(); |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
264 } |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
265 |
6208d4f6a277
Added trees for databinding.beans and observable
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
266 } |