Mercurial > projects > dwt2
annotate org.eclipse.core.commands/src/org/eclipse/core/commands/contexts/ContextManager.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 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 * 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.ContextManager; |
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15 |
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16 import org.eclipse.core.commands.contexts.IContextListener; |
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17 import org.eclipse.core.commands.contexts.IContextManagerListener; |
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18 import org.eclipse.core.commands.contexts.ContextEvent; |
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19 import org.eclipse.core.commands.contexts.ContextManagerEvent; |
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20 import org.eclipse.core.commands.contexts.Context; |
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21 import org.eclipse.core.commands.common.HandleObjectManager; |
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22 import org.eclipse.core.commands.util.Tracing; |
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23 import org.eclipse.core.internal.commands.util.Util; |
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24 |
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25 import java.lang.all; |
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26 import java.util.Set; |
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27 import java.util.HashSet; |
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28 import java.util.Collections; |
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29 |
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30 /** |
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31 * <p> |
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32 * A context manager tracks the sets of defined and enabled contexts within the |
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33 * application. The manager sends notification events to listeners when these |
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34 * sets change. It is also possible to retrieve any given context with its |
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35 * identifier. |
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36 * </p> |
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37 * <p> |
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38 * This class is not intended to be extended by clients. |
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39 * </p> |
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40 * |
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41 * @since 3.1 |
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42 */ |
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43 public final class ContextManager : HandleObjectManager, |
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44 IContextListener { |
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45 |
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46 private static const String DEFER_EVENTS = "org.eclipse.ui.internal.contexts.deferEvents"; //$NON-NLS-1$ |
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47 private static const String SEND_EVENTS = "org.eclipse.ui.internal.contexts.sendEvents"; //$NON-NLS-1$ |
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48 |
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49 /** |
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50 * This flag can be set to <code>true</code> if the context manager should |
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51 * print information to <code>System.out</code> when certain boundary |
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52 * conditions occur. |
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53 */ |
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54 public static bool DEBUG = false; |
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55 |
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56 /** |
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57 * The set of active context identifiers. This value may be empty, but it is |
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58 * never <code>null</code>. |
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59 */ |
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60 private Set activeContextIds; |
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61 private static Set EMPTY_SET; |
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62 |
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63 // allow the ContextManager to send one event for a larger delta |
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64 private bool caching = false; |
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65 |
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66 private int cachingRef = 0; |
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67 |
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68 private bool activeContextsChange = false; |
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69 |
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70 private Set oldIds = null; |
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71 |
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72 public this(){ |
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73 activeContextIds = new HashSet(); |
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74 if( EMPTY_SET is null ){ |
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75 EMPTY_SET = new HashSet(); |
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76 } |
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77 } |
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78 |
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79 /** |
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80 * Activates a context in this context manager. |
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81 * |
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82 * @param contextId |
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83 * The identifier of the context to activate; must not be |
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84 * <code>null</code>. |
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85 */ |
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86 public final void addActiveContext(String contextId) { |
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87 if (DEFER_EVENTS.equals(contextId)) { |
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88 cachingRef++; |
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89 if (cachingRef is 1 ) { |
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90 setEventCaching(true); |
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91 } |
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92 return; |
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93 } else if (SEND_EVENTS.equals(contextId)) { |
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94 cachingRef--; |
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95 if (cachingRef is 0) { |
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96 setEventCaching(false); |
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97 } |
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98 return; |
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99 } |
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100 |
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101 if (activeContextIds.contains(contextId)) { |
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102 return; |
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103 } |
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104 activeContextsChange = true; |
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105 |
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106 if (caching) { |
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107 activeContextIds.add(contextId); |
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108 } else { |
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109 Set previouslyActiveContextIds = new HashSet(activeContextIds); |
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110 activeContextIds.add(contextId); |
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111 |
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112 fireContextManagerChanged(new ContextManagerEvent(this, null, |
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113 false, true, previouslyActiveContextIds)); |
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114 } |
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115 |
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116 if (DEBUG) { |
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117 Tracing.printTrace("CONTEXTS", activeContextIds.toString()); //$NON-NLS-1$ |
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118 } |
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119 |
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120 } |
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121 |
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122 /** |
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123 * Adds a listener to this context manager. The listener will be notified |
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124 * when the set of defined contexts changes. This can be used to track the |
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125 * global appearance and disappearance of contexts. |
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126 * |
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127 * @param listener |
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128 * The listener to attach; must not be <code>null</code>. |
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129 */ |
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130 public final void addContextManagerListener( |
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131 IContextManagerListener listener) { |
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132 addListenerObject(cast(Object)listener); |
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133 } |
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134 |
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135 public final void contextChanged(ContextEvent contextEvent) { |
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136 if (contextEvent.isDefinedChanged()) { |
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137 Context context = contextEvent.getContext(); |
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138 String contextId = context.getId(); |
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139 bool contextIdAdded = context.isDefined(); |
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140 if (contextIdAdded) { |
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141 definedHandleObjects.add(context); |
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142 } else { |
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143 definedHandleObjects.remove(context); |
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144 } |
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145 if (isListenerAttached()) { |
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146 fireContextManagerChanged(new ContextManagerEvent(this, |
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147 contextId, contextIdAdded, false, null)); |
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148 } |
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149 } |
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150 } |
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151 |
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152 /** |
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153 * Notifies all of the listeners to this manager that the set of defined |
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154 * context identifiers has changed. |
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155 * |
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156 * @param event |
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157 * The event to send to all of the listeners; must not be |
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158 * <code>null</code>. |
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159 */ |
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160 private final void fireContextManagerChanged(ContextManagerEvent event) { |
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161 if (event is null) { |
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162 throw new NullPointerException(); |
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163 } |
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164 |
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165 Object[] listeners = getListeners(); |
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166 for (int i = 0; i < listeners.length; i++) { |
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167 IContextManagerListener listener = cast(IContextManagerListener) listeners[i]; |
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168 listener.contextManagerChanged(event); |
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169 } |
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170 } |
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171 |
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172 /** |
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173 * Returns the set of active context identifiers. |
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174 * |
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175 * @return The set of active context identifiers; this value may be |
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176 * <code>null</code> if no active contexts have been set yet. If |
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177 * the set is not <code>null</code>, then it contains only |
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178 * instances of <code>String</code>. |
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179 */ |
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180 public final Set getActiveContextIds() { |
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181 return Collections.unmodifiableSet(activeContextIds); |
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182 } |
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183 |
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184 /** |
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185 * Gets the context with the given identifier. If no such context currently |
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186 * exists, then the context will be created (but be undefined). |
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187 * |
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188 * @param contextId |
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189 * The identifier to find; must not be <code>null</code>. |
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190 * @return The context with the given identifier; this value will never be |
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191 * <code>null</code>, but it might be undefined. |
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192 * @see Context |
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193 */ |
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194 public final Context getContext(String contextId) { |
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195 checkId(contextId); |
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196 |
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197 Context context = cast(Context) handleObjectsById.get(contextId); |
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198 if (context is null) { |
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199 context = new Context(contextId); |
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200 handleObjectsById.put(contextId, context); |
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201 context.addContextListener(this); |
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202 } |
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203 |
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204 return context; |
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205 } |
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206 |
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207 /** |
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208 * Returns the set of identifiers for those contexts that are defined. |
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209 * |
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210 * @return The set of defined context identifiers; this value may be empty, |
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211 * but it is never <code>null</code>. |
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212 */ |
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213 public final Set getDefinedContextIds() { |
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214 return getDefinedHandleObjectIds(); |
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215 } |
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216 |
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217 /** |
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218 * Returns the those contexts that are defined. |
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219 * |
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220 * @return The defined contexts; this value may be empty, but it is never |
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221 * <code>null</code>. |
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222 * @since 3.2 |
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223 */ |
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224 public final Context[] getDefinedContexts() { |
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225 return arraycast!(Context)( definedHandleObjects |
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226 .toArray(/+new Context[definedHandleObjects.size()]+/)); |
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227 } |
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228 |
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229 /** |
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230 * Deactivates a context in this context manager. |
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231 * |
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232 * @param contextId |
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233 * The identifier of the context to deactivate; must not be |
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234 * <code>null</code>. |
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235 */ |
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236 public final void removeActiveContext(String contextId) { |
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237 if (!activeContextIds.contains(contextId)) { |
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238 return; |
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239 } |
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240 |
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241 activeContextsChange = true; |
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242 if (caching) { |
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243 activeContextIds.remove(contextId); |
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244 } else { |
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245 Set previouslyActiveContextIds = new HashSet(activeContextIds); |
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246 activeContextIds.remove(contextId); |
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247 |
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248 fireContextManagerChanged(new ContextManagerEvent(this, null, |
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249 false, true, previouslyActiveContextIds)); |
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250 } |
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251 |
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252 if (DEBUG) { |
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253 Tracing.printTrace("CONTEXTS", activeContextIds.toString()); //$NON-NLS-1$ |
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254 } |
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255 } |
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256 /** |
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257 * Removes a listener from this context manager. |
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258 * |
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259 * @param listener |
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260 * The listener to be removed; must not be <code>null</code>. |
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261 */ |
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262 public final void removeContextManagerListener( |
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263 IContextManagerListener listener) { |
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264 removeListenerObject(cast(Object)listener); |
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265 } |
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266 |
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267 /** |
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268 * Changes the set of active contexts for this context manager. The whole |
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269 * set is required so that internal consistency can be maintained and so |
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270 * that excessive recomputations do nothing occur. |
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271 * |
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272 * @param activeContextIds |
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273 * The new set of active context identifiers; may be |
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274 * <code>null</code>. |
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275 */ |
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276 public final void setActiveContextIds(Set activeContextIds) { |
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277 if (Util.equals(cast(Object)this.activeContextIds, cast(Object)activeContextIds)) { |
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278 return; |
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279 } |
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280 |
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281 activeContextsChange = true; |
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282 |
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283 Set previouslyActiveContextIds = this.activeContextIds; |
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284 if (activeContextIds !is null) { |
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285 this.activeContextIds = new HashSet(); |
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286 this.activeContextIds.addAll(activeContextIds); |
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287 } else { |
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288 this.activeContextIds = null; |
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289 } |
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290 |
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291 if (DEBUG) { |
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292 Tracing.printTrace("CONTEXTS", (activeContextIds is null) ? "none" //$NON-NLS-1$ //$NON-NLS-2$ |
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293 : activeContextIds.toString()); |
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294 } |
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295 |
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296 if (!caching) { |
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297 fireContextManagerChanged(new ContextManagerEvent(this, null, |
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298 false, true, previouslyActiveContextIds)); |
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299 } |
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300 } |
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301 |
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302 /** |
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303 * Set the manager to cache context id changes. |
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304 * |
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305 * @param cache |
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306 * <code>true</code> to turn caching on, <code>false</code> |
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307 * to turn caching off and send an event if necessary. |
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308 * @since 3.3 |
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309 */ |
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310 private void setEventCaching(bool cache) { |
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311 if (caching is cache) { |
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312 return; |
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313 } |
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314 caching = cache; |
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315 bool fireChange = activeContextsChange; |
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316 Set holdOldIds = (oldIds is null?Collections.EMPTY_SET:oldIds); |
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317 |
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318 if (caching) { |
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319 oldIds = new HashSet(activeContextIds); |
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320 } else { |
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321 oldIds = null; |
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322 } |
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323 activeContextsChange = false; |
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324 |
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325 if (!caching && fireChange) { |
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326 fireContextManagerChanged(new ContextManagerEvent(this, null, |
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327 false, true, holdOldIds)); |
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328 } |
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329 } |
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330 } |