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annotate dwtx/core/commands/Category.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 ea8ff534f622
children
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1 /*******************************************************************************
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2 * Copyright (c) 2005, 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 module dwtx.core.commands.Category;
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14
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15 import dwtx.core.commands.common.NamedHandleObject;
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16 import dwtx.core.internal.commands.util.Util;
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17 import dwtx.core.commands.ICategoryListener;
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18 import dwtx.core.commands.CategoryEvent;
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19
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20 import dwt.dwthelper.utils;
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21 import dwtx.dwtxhelper.Collection;
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22 import tango.text.convert.Format;
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24 /**
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25 * <p>
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26 * A logical group for a set of commands. A command belongs to exactly one
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27 * category. The category has no functional effect, but may be used in graphical
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28 * tools that want to group the set of commands somehow.
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29 * </p>
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30 *
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31 * @since 3.1
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32 */
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33 public final class Category : NamedHandleObject {
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34
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35 /**
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36 * A collection of objects listening to changes to this category. This
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37 * collection is <code>null</code> if there are no listeners.
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38 */
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39 private Collection categoryListeners;
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40
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41 /**
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42 * Constructs a new instance of <code>Category</code> based on the given
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43 * identifier. When a category is first constructed, it is undefined.
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44 * Category should only be constructed by the <code>CommandManager</code>
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45 * to ensure that identifier remain unique.
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46 *
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47 * @param id
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48 * The identifier for the category. This value must not be
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49 * <code>null</code>, and must be unique amongst all
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50 * categories.
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51 */
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52 this(String id) {
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53 super(id);
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54 }
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55
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56 /**
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57 * Adds a listener to this category that will be notified when this
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58 * category's state changes.
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59 *
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60 * @param categoryListener
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61 * The listener to be added; must not be <code>null</code>.
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62 */
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63 public final void addCategoryListener(
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64 ICategoryListener categoryListener) {
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65 if (categoryListener is null) {
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66 throw new NullPointerException();
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67 }
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68 if (categoryListeners is null) {
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69 categoryListeners = new ArrayList();
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70 }
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71 if (!categoryListeners.contains(cast(Object)categoryListener)) {
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72 categoryListeners.add(cast(Object)categoryListener);
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73 }
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74 }
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75
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76 /**
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77 * <p>
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78 * Defines this category by giving it a name, and possibly a description as
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79 * well. The defined property automatically becomes <code>true</code>.
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80 * </p>
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81 * <p>
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82 * Notification is sent to all listeners that something has changed.
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83 * </p>
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84 *
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85 * @param name
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86 * The name of this command; must not be <code>null</code>.
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87 * @param description
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88 * The description for this command; may be <code>null</code>.
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89 */
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90 public final void define(String name, String description) {
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91 if (name is null) {
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92 throw new NullPointerException(
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93 "The name of a command cannot be null"); //$NON-NLS-1$
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94 }
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95
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96 bool definedChanged = !this.defined;
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97 this.defined = true;
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98
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99 bool nameChanged = !Util.equals(this.name, name);
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100 this.name = name;
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101
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102 bool descriptionChanged = !Util.equals(this.description,
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103 description);
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104 this.description = description;
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105
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106 fireCategoryChanged(new CategoryEvent(this, definedChanged,
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107 descriptionChanged, nameChanged));
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108 }
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109
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110 /**
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111 * Notifies the listeners for this category that it has changed in some way.
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112 *
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113 * @param categoryEvent
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114 * The event to send to all of the listener; must not be
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115 * <code>null</code>.
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116 */
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117 private final void fireCategoryChanged(CategoryEvent categoryEvent) {
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118 if (categoryEvent is null) {
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119 throw new NullPointerException();
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120 }
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121 if (categoryListeners !is null) {
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122 Iterator listenerItr = categoryListeners.iterator();
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123 while (listenerItr.hasNext()) {
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124 ICategoryListener listener = cast(ICategoryListener) listenerItr
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125 .next();
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126 listener.categoryChanged(categoryEvent);
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127 }
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128 }
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129 }
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130
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131 /**
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132 * Removes a listener from this category.
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133 *
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134 * @param categoryListener
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135 * The listener to be removed; must not be <code>null</code>.
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136 *
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137 */
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138 public final void removeCategoryListener(
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139 ICategoryListener categoryListener) {
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140 if (categoryListener is null) {
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141 throw new NullPointerException();
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142 }
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143
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144 if (categoryListeners !is null) {
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145 categoryListeners.remove(cast(Object)categoryListener);
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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 * (non-Javadoc)
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151 *
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152 * @see dwtx.core.commands.common.HandleObject#toString()
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153 */
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154 public override String toString() {
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155 if (string is null) {
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156 string = Format( "Category({},{},{},{})", id, name, description, defined );
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157 }
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158 return string;
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159 }
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160
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161 /*
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162 * (non-Javadoc)
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163 *
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164 * @see dwtx.core.commands.common.HandleObject#undefine()
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165 */
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166 public override void undefine() {
3
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167 string = null;
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168
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169 final bool definedChanged = defined;
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170 defined = false;
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171
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172 final bool nameChanged = name !is null;
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173 name = null;
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174
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175 final bool descriptionChanged = description !is null;
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176 description = null;
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177
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178 fireCategoryChanged(new CategoryEvent(this, definedChanged,
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179 descriptionChanged, nameChanged));
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180 }
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181
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182 }