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annotate dwtx/core/commands/contexts/ContextManager.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) 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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14 module dwtx.core.commands.contexts.ContextManager;
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16 import dwtx.core.commands.contexts.IContextListener;
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17 import dwtx.core.commands.contexts.IContextManagerListener;
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18 import dwtx.core.commands.contexts.ContextEvent;
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19 import dwtx.core.commands.contexts.ContextManagerEvent;
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20 import dwtx.core.commands.contexts.Context;
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21 import dwtx.core.commands.common.HandleObjectManager;
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22 import dwtx.core.commands.util.Tracing;
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23 import dwtx.core.internal.commands.util.Util;
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25 import dwt.dwthelper.utils;
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26 import dwtx.dwtxhelper.Collection;
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28 /**
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29 * <p>
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30 * A context manager tracks the sets of defined and enabled contexts within the
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31 * application. The manager sends notification events to listeners when these
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32 * sets change. It is also possible to retrieve any given context with its
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33 * identifier.
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34 * </p>
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35 * <p>
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36 * This class is not intended to be extended by clients.
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37 * </p>
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38 *
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39 * @since 3.1
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40 */
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41 public final class ContextManager : HandleObjectManager,
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42 IContextListener {
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43
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44 private static const String DEFER_EVENTS = "dwtx.ui.internal.contexts.deferEvents"; //$NON-NLS-1$
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45 private static const String SEND_EVENTS = "dwtx.ui.internal.contexts.sendEvents"; //$NON-NLS-1$
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46
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47 /**
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48 * This flag can be set to <code>true</code> if the context manager should
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49 * print information to <code>System.out</code> when certain boundary
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50 * conditions occur.
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51 */
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52 public static bool DEBUG = false;
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53
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54 /**
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55 * The set of active context identifiers. This value may be empty, but it is
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56 * never <code>null</code>.
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57 */
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58 private Set activeContextIds;
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59 private static Set EMPTY_SET;
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61 // allow the ContextManager to send one event for a larger delta
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62 private bool caching = false;
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63
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64 private int cachingRef = 0;
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65
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66 private bool activeContextsChange = false;
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67
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68 private Set oldIds = null;
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70 public this(){
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71 activeContextIds = new HashSet();
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72 if( EMPTY_SET is null ){
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73 EMPTY_SET = new HashSet();
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74 }
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75 }
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76
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77 /**
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78 * Activates a context in this context manager.
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79 *
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80 * @param contextId
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81 * The identifier of the context to activate; must not be
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82 * <code>null</code>.
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83 */
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84 public final void addActiveContext(String contextId) {
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85 if (DEFER_EVENTS.equals(contextId)) {
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86 cachingRef++;
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87 if (cachingRef is 1 ) {
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88 setEventCaching(true);
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89 }
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90 return;
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91 } else if (SEND_EVENTS.equals(contextId)) {
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92 cachingRef--;
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93 if (cachingRef is 0) {
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94 setEventCaching(false);
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95 }
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96 return;
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97 }
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98
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99 if (activeContextIds.contains(contextId)) {
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100 return;
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101 }
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102 activeContextsChange = true;
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103
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104 if (caching) {
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105 activeContextIds.add(contextId);
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106 } else {
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107 Set previouslyActiveContextIds = new HashSet(activeContextIds);
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108 activeContextIds.add(contextId);
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109
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110 fireContextManagerChanged(new ContextManagerEvent(this, null,
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111 false, true, previouslyActiveContextIds));
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112 }
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113
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114 if (DEBUG) {
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115 Tracing.printTrace("CONTEXTS", activeContextIds.toString()); //$NON-NLS-1$
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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 * Adds a listener to this context manager. The listener will be notified
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122 * when the set of defined contexts changes. This can be used to track the
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123 * global appearance and disappearance of contexts.
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124 *
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125 * @param listener
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126 * The listener to attach; must not be <code>null</code>.
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127 */
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128 public final void addContextManagerListener(
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129 IContextManagerListener listener) {
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130 addListenerObject(cast(Object)listener);
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131 }
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132
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133 public final void contextChanged(ContextEvent contextEvent) {
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134 if (contextEvent.isDefinedChanged()) {
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135 Context context = contextEvent.getContext();
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136 String contextId = context.getId();
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137 bool contextIdAdded = context.isDefined();
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138 if (contextIdAdded) {
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139 definedHandleObjects.add(context);
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140 } else {
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141 definedHandleObjects.remove(context);
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142 }
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143 if (isListenerAttached()) {
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144 fireContextManagerChanged(new ContextManagerEvent(this,
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145 contextId, contextIdAdded, false, null));
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146 }
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147 }
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148 }
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149
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150 /**
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151 * Notifies all of the listeners to this manager that the set of defined
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152 * context identifiers has changed.
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153 *
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154 * @param event
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155 * The event to send to all of the listeners; must not be
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156 * <code>null</code>.
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157 */
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158 private final void fireContextManagerChanged(ContextManagerEvent event) {
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159 if (event is null) {
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160 throw new NullPointerException();
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161 }
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162
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163 Object[] listeners = getListeners();
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164 for (int i = 0; i < listeners.length; i++) {
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165 IContextManagerListener listener = cast(IContextManagerListener) listeners[i];
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166 listener.contextManagerChanged(event);
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167 }
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168 }
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169
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170 /**
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171 * Returns the set of active context identifiers.
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172 *
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173 * @return The set of active context identifiers; this value may be
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174 * <code>null</code> if no active contexts have been set yet. If
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175 * the set is not <code>null</code>, then it contains only
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176 * instances of <code>String</code>.
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177 */
104
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178 public final Set getActiveContextIds() {
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179 return Collections.unmodifiableSet(activeContextIds);
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180 }
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181
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182 /**
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183 * Gets the context with the given identifier. If no such context currently
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184 * exists, then the context will be created (but be undefined).
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185 *
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186 * @param contextId
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187 * The identifier to find; must not be <code>null</code>.
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188 * @return The context with the given identifier; this value will never be
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189 * <code>null</code>, but it might be undefined.
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190 * @see Context
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191 */
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192 public final Context getContext(String contextId) {
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193 checkId(contextId);
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194
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195 Context context = cast(Context) handleObjectsById.get(contextId);
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196 if (context is null) {
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197 context = new Context(contextId);
104
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198 handleObjectsById.put(contextId, context);
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199 context.addContextListener(this);
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200 }
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201
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202 return context;
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203 }
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204
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205 /**
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206 * Returns the set of identifiers for those contexts that are defined.
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207 *
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208 * @return The set of defined context identifiers; this value may be empty,
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209 * but it is never <code>null</code>.
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210 */
104
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211 public final Set getDefinedContextIds() {
3
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212 return getDefinedHandleObjectIds();
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213 }
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214
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215 /**
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216 * Returns the those contexts that are defined.
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217 *
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218 * @return The defined contexts; this value may be empty, but it is never
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219 * <code>null</code>.
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220 * @since 3.2
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221 */
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222 public final Context[] getDefinedContexts() {
104
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223 return arraycast!(Context)( definedHandleObjects
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224 .toArray(/+new Context[definedHandleObjects.size()]+/));
3
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225 }
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226
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227 /**
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228 * Deactivates a context in this context manager.
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229 *
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230 * @param contextId
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231 * The identifier of the context to deactivate; must not be
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232 * <code>null</code>.
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233 */
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234 public final void removeActiveContext(String contextId) {
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235 if (!activeContextIds.contains(contextId)) {
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236 return;
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237 }
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238
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239 activeContextsChange = true;
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240 if (caching) {
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241 activeContextIds.remove(contextId);
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242 } else {
104
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243 Set previouslyActiveContextIds = new HashSet(activeContextIds);
3
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244 activeContextIds.remove(contextId);
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245
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246 fireContextManagerChanged(new ContextManagerEvent(this, null,
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247 false, true, previouslyActiveContextIds));
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248 }
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249
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250 if (DEBUG) {
104
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251 Tracing.printTrace("CONTEXTS", activeContextIds.toString()); //$NON-NLS-1$
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252 }
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253 }
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254 /**
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255 * Removes a listener from this context manager.
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256 *
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257 * @param listener
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258 * The listener to be removed; must not be <code>null</code>.
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259 */
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260 public final void removeContextManagerListener(
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261 IContextManagerListener listener) {
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262 removeListenerObject(cast(Object)listener);
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263 }
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264
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265 /**
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266 * Changes the set of active contexts for this context manager. The whole
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267 * set is required so that internal consistency can be maintained and so
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268 * that excessive recomputations do nothing occur.
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269 *
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270 * @param activeContextIds
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271 * The new set of active context identifiers; may be
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272 * <code>null</code>.
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273 */
104
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274 public final void setActiveContextIds(Set activeContextIds) {
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275 if (Util.equals(cast(Object)this.activeContextIds, cast(Object)activeContextIds)) {
3
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276 return;
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277 }
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278
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279 activeContextsChange = true;
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280
104
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281 Set previouslyActiveContextIds = this.activeContextIds;
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282 if (activeContextIds !is null) {
104
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283 this.activeContextIds = new HashSet();
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284 this.activeContextIds.addAll(activeContextIds);
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285 } else {
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286 this.activeContextIds = null;
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287 }
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288
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289 if (DEBUG) {
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290 Tracing.printTrace("CONTEXTS", (activeContextIds is null) ? "none" //$NON-NLS-1$ //$NON-NLS-2$
104
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291 : activeContextIds.toString());
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292 }
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293
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294 if (!caching) {
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295 fireContextManagerChanged(new ContextManagerEvent(this, null,
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296 false, true, previouslyActiveContextIds));
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297 }
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298 }
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299
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300 /**
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301 * Set the manager to cache context id changes.
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302 *
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303 * @param cache
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304 * <code>true</code> to turn caching on, <code>false</code>
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305 * to turn caching off and send an event if necessary.
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306 * @since 3.3
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307 */
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308 private void setEventCaching(bool cache) {
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309 if (caching is cache) {
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310 return;
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311 }
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312 caching = cache;
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313 bool fireChange = activeContextsChange;
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314 Set holdOldIds = (oldIds is null?Collections.EMPTY_SET:oldIds);
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316 if (caching) {
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317 oldIds = new HashSet(activeContextIds);
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318 } else {
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319 oldIds = null;
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320 }
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321 activeContextsChange = false;
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323 if (!caching && fireChange) {
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324 fireContextManagerChanged(new ContextManagerEvent(this, null,
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325 false, true, holdOldIds));
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326 }
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327 }
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328 }