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comparison org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/observable/ConstantObservableValue.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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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2005, 2007-2008 Matt Carter 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 * Matt Carter - initial API and implementation (bug 212518)
10 * Matthew Hall - bug 212518
11 *******************************************************************************/
12 module org.eclipse.core.internal.databinding.observable.ConstantObservableValue;
13
14 import java.lang.all;
15
16 import org.eclipse.core.databinding.observable.IChangeListener;
17 import org.eclipse.core.databinding.observable.IStaleListener;
18 import org.eclipse.core.databinding.observable.ObservableTracker;
19 import org.eclipse.core.databinding.observable.Realm;
20 import org.eclipse.core.databinding.observable.value.IObservableValue;
21 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
22 import org.eclipse.core.databinding.observable.value.WritableValue;
23 import org.eclipse.core.runtime.Assert;
24
25 /**
26 * An immutable {@link IObservableValue}.
27 *
28 * @see WritableValue
29 */
30 public class ConstantObservableValue : IObservableValue {
31 final Realm realm;
32 final Object value;
33 final Object type;
34
35 /**
36 * Construct a constant value of the given type, in the default realm.
37 *
38 * @param value
39 * immutable value
40 * @param type
41 * type
42 */
43 public this(Object value, Object type) {
44 this(Realm.getDefault(), value, type);
45 }
46
47 /**
48 * Construct a constant value of the given type, in the given realm.
49 *
50 * @param realm
51 * Realm
52 * @param value
53 * immutable value
54 * @param type
55 * type
56 */
57 public this(Realm realm, Object value, Object type) {
58 Assert.isNotNull(realm, "Realm cannot be null"); //$NON-NLS-1$
59 this.realm = realm;
60 this.value = value;
61 this.type = type;
62 }
63
64 public Object getValueType() {
65 return type;
66 }
67
68 public Object getValue() {
69 ObservableTracker.getterCalled(this);
70 return value;
71 }
72
73 public void setValue(Object value) {
74 throw new UnsupportedOperationException();
75 }
76
77 public void addValueChangeListener(IValueChangeListener listener) {
78 // ignore
79 }
80
81 public void removeValueChangeListener(IValueChangeListener listener) {
82 // ignore
83 }
84
85 public void addChangeListener(IChangeListener listener) {
86 // ignore
87 }
88
89 public void addStaleListener(IStaleListener listener) {
90 // ignore
91 }
92
93 public void dispose() {
94 // nothing to dispose
95 }
96
97 public Realm getRealm() {
98 return realm;
99 }
100
101 public bool isStale() {
102 return false;
103 }
104
105 public void removeChangeListener(IChangeListener listener) {
106 // ignore
107 }
108
109 public void removeStaleListener(IStaleListener listener) {
110 // ignore
111 }
112 }