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annotate org.eclipse.core.commands/src/org/eclipse/core/commands/contexts/Context.d @ 35:634e4380db78

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author Frank Benoit <benoit@tionex.de>
date Mon, 23 Mar 2009 18:28:04 +0100
parents bc29606a740c
children
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1 /*******************************************************************************
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2 * Copyright (c) 2004, 2006 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
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14 module org.eclipse.core.commands.contexts.Context;
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15
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16 import org.eclipse.core.commands.contexts.ContextEvent;
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17 import org.eclipse.core.commands.contexts.IContextListener;
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18 import org.eclipse.core.commands.common.NamedHandleObject;
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19 import org.eclipse.core.commands.common.NotDefinedException;
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20 import org.eclipse.core.internal.commands.util.Util;
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21
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22 import java.lang.all;
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23 import java.util.Set;
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24 import java.util.Iterator;
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25 import java.util.HashSet;
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26
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27 /**
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28 * <p>
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29 * A context is an answer to the question "when". Other services can listen for
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30 * the activation and deactivation of contexts, and change their own state in
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31 * response to these changes. For example, Eclipse's key binding service listens
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32 * to context activation and deactivation to determine which key bindings should
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33 * be active.
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34 * </p>
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35 * <p>
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36 * An instance of this interface can be obtained from an instance of
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37 * <code>ContextManager</code> for any identifier, whether or not an context
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38 * with that identifier is defined in the extension registry.
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39 * </p>
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40 * <p>
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41 * The handle-based nature of this API allows it to work well with runtime
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42 * plugin activation and deactivation. If a context is defined, that means that
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43 * its corresponding plug-in is active. If the plug-in is then deactivated, the
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44 * context will still exist but it will be undefined. An attempts to use an
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45 * undefined context will result in a <code>NotDefinedException</code> being
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46 * thrown.
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47 * </p>
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48 * <p>
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49 * This class is not intended to be extended by clients.
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50 * </p>
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51 *
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52 * @since 3.1
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53 * @see ContextManager
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54 */
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55 public final class Context : NamedHandleObject, Comparable {
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56
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57 /**
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58 * The collection of all objects listening to changes on this context. This
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59 * value is <code>null</code> if there are no listeners.
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60 */
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61 private Set listeners = null;
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62
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63 /**
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64 * The parent identifier for this context. The meaning of a parent is
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65 * dependent on the system using contexts. This value can be
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66 * <code>null</code> if the context has no parent.
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67 */
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68 private String parentId = null;
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69
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70 /**
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71 * Constructs a new instance of <code>Context</code>.
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72 *
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73 * @param id
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74 * The id for this context; must not be <code>null</code>.
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75 */
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76 this(String id) {
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77 super(id);
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78 }
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79
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80 /**
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81 * Registers an instance of <code>IContextListener</code> to listen for
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82 * changes to properties of this instance.
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83 *
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84 * @param listener
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85 * the instance to register. Must not be <code>null</code>. If
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86 * an attempt is made to register an instance which is already
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87 * registered with this instance, no operation is performed.
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88 */
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89 public final void addContextListener(IContextListener listener) {
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90 if (listener is null) {
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91 throw new NullPointerException();
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92 }
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93
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94 if (listeners is null) {
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95 listeners = new HashSet();
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96 }
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97
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98 listeners.add(cast(Object)listener);
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99 }
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100
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101 /* (non-Javadoc)
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102 * @see java.lang.Comparable#compareTo(java.lang.Object)
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103 */
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104 public final int compareTo(Object object) {
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105 Context scheme = cast(Context) object;
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106 int compareTo = Util.compare(this.id, scheme.id);
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107 if (compareTo is 0) {
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108 compareTo = Util.compare(this.name, scheme.name);
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109 if (compareTo is 0) {
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110 compareTo = Util.compare(this.parentId, scheme.parentId);
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111 if (compareTo is 0) {
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112 compareTo = Util.compare(this.description,
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113 scheme.description);
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114 if (compareTo is 0) {
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115 compareTo = Util.compare(this.defined, scheme.defined);
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116 }
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117 }
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118 }
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119 }
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120
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121 return compareTo;
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122 }
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123 public final override int opCmp( Object object ){
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124 return compareTo( object );
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125 }
12
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126
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127 /**
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128 * <p>
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129 * Defines this context by giving it a name, and possibly a description and
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130 * a parent identifier as well. The defined property automatically becomes
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131 * <code>true</code>.
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132 * </p>
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133 * <p>
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134 * Notification is sent to all listeners that something has changed.
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135 * </p>
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136 *
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137 * @param name
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138 * The name of this context; must not be <code>null</code>.
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139 * @param description
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140 * The description for this context; may be <code>null</code>.
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141 * @param parentId
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142 * The parent identifier for this context; may be
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143 * <code>null</code>.
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144 */
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145 public final void define(String name, String description,
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146 String parentId) {
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147 if (name is null) {
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148 throw new NullPointerException(
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149 "The name of a scheme cannot be null"); //$NON-NLS-1$
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150 }
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151
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152 bool definedChanged = !this.defined;
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153 this.defined = true;
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154
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155 bool nameChanged = !Util.equals(this.name, name);
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156 this.name = name;
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157
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158 bool descriptionChanged = !Util.equals(this.description,
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159 description);
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160 this.description = description;
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161
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162 bool parentIdChanged = !Util.equals(this.parentId, parentId);
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163 this.parentId = parentId;
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164
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165 fireContextChanged(new ContextEvent(this, definedChanged, nameChanged,
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166 descriptionChanged, parentIdChanged));
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167 }
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168
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169 /**
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170 * Notifies all listeners that this context has changed. This sends the
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171 * given event to all of the listeners, if any.
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172 *
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173 * @param event
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174 * The event to send to the listeners; must not be
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175 * <code>null</code>.
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176 */
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177 private final void fireContextChanged(ContextEvent event) {
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178 if (event is null) {
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179 throw new NullPointerException(
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180 "Cannot send a null event to listeners."); //$NON-NLS-1$
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181 }
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182
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183 if (listeners is null) {
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184 return;
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185 }
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186
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187 Iterator listenerItr = listeners.iterator();
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188 while (listenerItr.hasNext()) {
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189 IContextListener listener = cast(IContextListener) listenerItr
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190 .next();
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191 listener.contextChanged(event);
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192 }
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193 }
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194
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195 /**
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196 * Returns the identifier of the parent of this instance.
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197 * <p>
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198 * Notification is sent to all registered listeners if this property
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199 * changes.
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200 * </p>
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201 *
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202 * @return the identifier of the parent of this instance. May be
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203 * <code>null</code>.
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204 * @throws NotDefinedException
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205 * if this instance is not defined.
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206 */
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207 public final String getParentId() {
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208 if (!defined) {
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209 throw new NotDefinedException(
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210 "Cannot get the parent identifier from an undefined context. " //$NON-NLS-1$
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211 ~ id);
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212 }
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213
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214 return parentId;
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215 }
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216
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217 /**
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218 * Unregisters an instance of <code>IContextListener</code> listening for
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219 * changes to properties of this instance.
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220 *
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221 * @param contextListener
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222 * the instance to unregister. Must not be <code>null</code>.
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223 * If an attempt is made to unregister an instance which is not
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224 * already registered with this instance, no operation is
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225 * performed.
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226 */
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227 public final void removeContextListener(
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228 IContextListener contextListener) {
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229 if (contextListener is null) {
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230 throw new NullPointerException("Cannot remove a null listener."); //$NON-NLS-1$
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231 }
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232
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233 if (listeners is null) {
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234 return;
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235 }
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236
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237 listeners.remove(cast(Object)contextListener);
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238
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239 if (listeners.isEmpty()) {
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240 listeners = null;
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241 }
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242 }
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243
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244 /**
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245 * The string representation of this context -- for debugging purposes only.
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246 * This string should not be shown to an end user.
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247 *
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248 * @return The string representation; never <code>null</code>.
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249 */
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250 public override final String toString() {
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251 if (string is null) {
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252 final StringBuffer stringBuffer = new StringBuffer();
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253 stringBuffer.append("Context("); //$NON-NLS-1$
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254 stringBuffer.append(id);
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255 stringBuffer.append(',');
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256 stringBuffer.append(name);
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257 stringBuffer.append(',');
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258 stringBuffer.append(description);
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259 stringBuffer.append(',');
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260 stringBuffer.append(parentId);
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261 stringBuffer.append(',');
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262 stringBuffer.append(defined ? "true" : "false");
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263 stringBuffer.append(')');
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264 string = stringBuffer.toString();
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265 }
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266 return string;
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267 }
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268
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269 /**
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270 * Makes this context become undefined. This has the side effect of changing
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271 * the name, description and parent identifier to <code>null</code>.
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272 * Notification is sent to all listeners.
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273 */
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274 public override final void undefine() {
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275 string = null;
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276
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277 bool definedChanged = defined;
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278 defined = false;
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279
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280 bool nameChanged = name !is null;
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281 name = null;
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282
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283 bool descriptionChanged = description !is null;
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284 description = null;
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285
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286 bool parentIdChanged = parentId !is null;
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287 parentId = null;
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288
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289 fireContextChanged(new ContextEvent(this, definedChanged, nameChanged,
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290 descriptionChanged, parentIdChanged));
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291 }
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292 }