Mercurial > projects > dwt2
annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/value/WritableValue.d @ 97:c86eb8b3098e
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author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:18:25 +0200 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2006, 2007 IBM Corporation 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 * IBM Corporation - initial API and implementation |
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10 * Brad Reynolds - bug 158687 |
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11 * Brad Reynolds - bug 164653, 147515 |
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12 *******************************************************************************/ |
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13 |
96
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14 module org.eclipse.core.databinding.observable.value.WritableValue; |
97 | 15 import org.eclipse.core.databinding.observable.value.AbstractObservableValue; |
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16 |
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17 import java.lang.all; |
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18 |
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19 import org.eclipse.core.databinding.observable.Diffs; |
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20 import org.eclipse.core.databinding.observable.Realm; |
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21 |
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22 /** |
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23 * Mutable (writable) implementation of {@link IObservableValue} that will maintain a value and fire |
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24 * change events when the value changes. |
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25 * <p> |
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26 * This class is thread safe. All state accessing methods must be invoked from |
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27 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing |
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28 * listeners may be invoked from any thread. |
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29 * </p> |
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30 * @since 1.0 |
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31 */ |
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32 public class WritableValue : AbstractObservableValue { |
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33 |
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34 private final Object valueType; |
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35 |
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36 /** |
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37 * Constructs a new instance with the default realm, a <code>null</code> |
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38 * value type, and a <code>null</code> value. |
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39 */ |
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40 public this() { |
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41 this(null, null); |
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42 } |
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43 |
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44 /** |
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45 * Constructs a new instance with the default realm. |
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46 * |
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47 * @param initialValue |
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48 * can be <code>null</code> |
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49 * @param valueType |
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50 * can be <code>null</code> |
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51 */ |
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52 public this(Object initialValue, Object valueType) { |
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53 this(Realm.getDefault(), initialValue, valueType); |
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54 } |
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55 |
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56 /** |
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57 * Constructs a new instance with the provided <code>realm</code>, a |
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58 * <code>null</code> value type, and a <code>null</code> initial value. |
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59 * |
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60 * @param realm |
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61 */ |
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62 public this(Realm realm) { |
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63 this(realm, null, null); |
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64 } |
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65 |
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66 /** |
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67 * Constructs a new instance. |
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68 * |
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69 * @param realm |
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70 * @param initialValue |
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71 * can be <code>null</code> |
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72 * @param valueType |
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73 * can be <code>null</code> |
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74 */ |
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75 public this(Realm realm, Object initialValue, Object valueType) { |
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76 super(realm); |
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77 this.valueType = valueType; |
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78 this.value = initialValue; |
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79 } |
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80 |
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81 private Object value = null; |
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82 |
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83 public Object doGetValue() { |
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84 return value; |
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85 } |
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86 |
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87 /** |
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88 * @param value |
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89 * The value to set. |
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90 */ |
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91 public void doSetValue(Object value) { |
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92 bool changed = false; |
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93 |
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94 if (this.value is null && value !is null) { |
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95 changed = true; |
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96 } else if (this.value !is null && !this.value.equals(value)) { |
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97 changed = true; |
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98 } |
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99 |
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100 if (changed) { |
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101 fireValueChange(Diffs.createValueDiff(this.value, this.value = value)); |
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102 } |
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103 } |
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104 |
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105 public Object getValueType() { |
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106 return valueType; |
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107 } |
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108 |
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109 /** |
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110 * @param elementType can be <code>null</code> |
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111 * @return new instance with the default realm and a value of <code>null</code> |
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112 */ |
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113 public static WritableValue withValueType(Object elementType) { |
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114 return new WritableValue(Realm.getDefault(), null, elementType); |
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115 } |
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116 } |