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