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