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annotate dwtx/core/commands/contexts/ContextManagerEvent.d @ 104:04b47443bb01

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Reworked the collection uses to make use of a wrapper collection that is compatible to the Java Collections. These new wrappers now use the tango.util.containers instead of the tango.util.collections.
author Frank Benoit <benoit@tionex.de>
date Thu, 07 Aug 2008 15:01:33 +0200
parents 6518c18a01f7
children
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1 /*******************************************************************************
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2 * Copyright (c) 2003, 2005 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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.core.commands.contexts.ContextManagerEvent;
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15 import dwtx.core.commands.contexts.ContextManager;
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16 import dwtx.core.commands.common.AbstractBitSetEvent;
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18 import dwt.dwthelper.utils;
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19 import dwtx.dwtxhelper.Collection;
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21 /**
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22 * <p>
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23 * An event indicating that the set of defined context identifiers has changed.
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24 * </p>
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25 *
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26 * @since 3.1
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27 * @see IContextManagerListener#contextManagerChanged(ContextManagerEvent)
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28 */
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29 public final class ContextManagerEvent : AbstractBitSetEvent {
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30
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31 /**
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32 * The bit used to represent whether the set of defined contexts has
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33 * changed.
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34 */
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35 private static const int CHANGED_CONTEXT_DEFINED = 1 << 1;
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36
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37 /**
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38 * The bit used to represent whether the set of active contexts has changed.
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39 */
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40 private static const int CHANGED_CONTEXTS_ACTIVE = 1;
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41
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42 /**
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43 * The context identifier that was added or removed from the list of defined
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44 * context identifiers.
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45 */
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46 private const String contextId;
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47
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48 /**
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49 * The context manager that has changed.
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50 */
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51 private const ContextManager contextManager;
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52
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53 /**
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54 * The set of context identifiers (strings) that were active before the
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55 * change occurred. If the active contexts did not changed, then this value
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56 * is <code>null</code>.
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57 */
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58 private const Set previouslyActiveContextIds;
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59
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60 /**
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61 * Creates a new instance of this class.
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62 *
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63 * @param contextManager
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64 * the instance of the interface that changed; must not be
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65 * <code>null</code>.
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66 * @param contextId
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67 * The context identifier that was added or removed; may be
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68 * <code>null</code> if the active contexts are changing.
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69 * @param contextIdAdded
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70 * Whether the context identifier became defined (otherwise, it
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71 * became undefined).
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72 * @param activeContextsChanged
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73 * Whether the list of active contexts has changed.
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74 * @param previouslyActiveContextIds
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75 * the set of identifiers of previously active contexts. This set
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76 * may be empty. If this set is not empty, it must only contain
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77 * instances of <code>String</code>. This set must be
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78 * <code>null</code> if activeContextChanged is
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79 * <code>false</code> and must not be null if
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80 * activeContextChanged is <code>true</code>.
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81 */
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82 public this(ContextManager contextManager,
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83 String contextId, bool contextIdAdded,
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84 bool activeContextsChanged,
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85 Set previouslyActiveContextIds) {
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86 if (contextManager is null) {
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87 throw new NullPointerException();
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88 }
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89
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90 this.contextManager = contextManager;
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91 this.contextId = contextId;
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92 this.previouslyActiveContextIds = previouslyActiveContextIds;
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93
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94 if (contextIdAdded) {
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95 changedValues |= CHANGED_CONTEXT_DEFINED;
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96 }
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97 if (activeContextsChanged) {
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98 changedValues |= CHANGED_CONTEXTS_ACTIVE;
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99 }
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100 }
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101
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102 /**
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103 * Returns the context identifier that was added or removed.
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104 *
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105 * @return The context identifier that was added or removed. This value may
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106 * be <code>null</code> if no context identifier was added or
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107 * removed.
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108 */
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109 public final String getContextId() {
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110 return contextId;
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111 }
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112
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113 /**
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114 * Returns the instance of the interface that changed.
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115 *
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116 * @return the instance of the interface that changed. Guaranteed not to be
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117 * <code>null</code>.
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118 */
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119 public final ContextManager getContextManager() {
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120 return contextManager;
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121 }
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122
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123 /**
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124 * Returns the set of identifiers to previously active contexts.
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125 *
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126 * @return the set of identifiers to previously active contexts. This set
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127 * may be empty. If this set is not empty, it is guaranteed to only
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128 * contain instances of <code>String</code>. This set is
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129 * guaranteed to be <code>null</code> if
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130 * haveActiveContextChanged() is <code>false</code> and is
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131 * guaranteed to not be <code>null</code> if
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132 * haveActiveContextsChanged() is <code>true</code>.
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133 */
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134 public final Set getPreviouslyActiveContextIds() {
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135 return previouslyActiveContextIds;
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136 }
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137
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138 /**
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139 * Returns whether the active context identifiers have changed.
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140 *
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141 * @return <code>true</code> if the collection of active contexts changed;
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142 * <code>false</code> otherwise.
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143 */
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144 public final bool isActiveContextsChanged() {
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145 return ((changedValues & CHANGED_CONTEXTS_ACTIVE) !is 0);
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146 }
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147
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148 /**
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149 * Returns whether the list of defined context identifiers has changed.
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150 *
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151 * @return <code>true</code> if the list of context identifiers has
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152 * changed; <code>false</code> otherwise.
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153 */
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154 public final bool isContextChanged() {
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155 return (contextId !is null);
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156 }
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157
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158 /**
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159 * Returns whether the context identifier became defined. Otherwise, the
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160 * context identifier became undefined.
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161 *
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162 * @return <code>true</code> if the context identifier became defined;
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163 * <code>false</code> if the context identifier became undefined.
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164 */
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165 public final bool isContextDefined() {
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166 return (((changedValues & CHANGED_CONTEXT_DEFINED) !is 0) && (contextId !is null));
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167 }
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168 }