Mercurial > projects > dwt2
annotate org.eclipse.core.commands/src/org/eclipse/core/commands/common/HandleObject.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) 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 module org.eclipse.core.commands.common.HandleObject; |
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14 |
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15 import org.eclipse.core.internal.commands.util.Util; |
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16 import org.eclipse.core.commands.common.IIdentifiable; |
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17 import org.eclipse.core.commands.common.EventManager; |
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18 import java.lang.all; |
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19 |
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20 /** |
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21 * <p> |
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22 * An object that can exist in one of two states: defined and undefined. This is |
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23 * used by APIs that want to give a handle to an object, even though the object |
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24 * does not fully exist yet. This way, users can attach listeners to objects |
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25 * before they come into existence. It also protects the API from users that do |
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26 * not release references when they should. |
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27 * </p> |
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28 * <p> |
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29 * To enforce good coding practice, all handle objects must implement |
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30 * <code>equals</code> and <code>toString</code>. Please use |
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31 * <code>string</code> to cache the result for <code>toString</code> once |
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32 * calculated. |
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33 * </p> |
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34 * <p> |
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35 * All handle objects are referred to using a single identifier. This identifier |
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36 * is a instance of <code>String</code>. It is important that this identifier |
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37 * remain unique within whatever context that handle object is being used. For |
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38 * example, there should only ever be one instance of <code>Command</code> |
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39 * with a given identifier. |
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40 * </p> |
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41 * |
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42 * @since 3.1 |
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43 */ |
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44 public abstract class HandleObject : EventManager, |
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45 IIdentifiable { |
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46 |
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47 /** |
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48 * The constant integer hash code value meaning the hash code has not yet |
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49 * been computed. |
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50 */ |
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51 private static const int HASH_CODE_NOT_COMPUTED = -1; |
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52 |
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53 /** |
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54 * A factor for computing the hash code for all schemes. |
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55 */ |
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56 private static const int HASH_FACTOR = 89; |
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57 |
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58 /** |
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59 * The seed for the hash code for all schemes. |
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60 */ |
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61 private static const int HASH_INITIAL; |
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62 |
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63 static this(){ |
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64 HASH_INITIAL = |
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65 //typeid(char[]).getHash(& HandleObject.classinfo.name ); |
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66 java.lang.all.toHash(HandleObject.classinfo.name); |
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67 } |
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68 /** |
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69 * Whether this object is defined. A defined object is one that has been |
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70 * fully initialized. By default, all objects start as undefined. |
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71 */ |
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72 protected /+transient+/ bool defined = false; |
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73 |
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74 /** |
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75 * The hash code for this object. This value is computed lazily, and marked |
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76 * as invalid when one of the values on which it is based changes. |
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77 */ |
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78 private /+transient+/ int hashCode = HASH_CODE_NOT_COMPUTED; |
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79 |
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80 /** |
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81 * The identifier for this object. This identifier should be unique across |
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82 * all objects of the same type and should never change. This value will |
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83 * never be <code>null</code>. |
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84 */ |
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85 protected /+final+/ String id; |
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86 |
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87 /** |
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88 * The string representation of this object. This string is for debugging |
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89 * purposes only, and is not meant to be displayed to the user. This value |
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90 * is computed lazily, and is cleared if one of its dependent values |
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91 * changes. |
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92 */ |
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93 protected /+transient+/ String string = null; |
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94 |
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95 /** |
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96 * Constructs a new instance of <code>HandleObject</code>. |
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97 * |
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98 * @param id |
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99 * The id of this handle; must not be <code>null</code>. |
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100 */ |
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101 protected this(String id) { |
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102 if (id is null) { |
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103 throw new NullPointerException( |
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104 "Cannot create a handle with a null id"); //$NON-NLS-1$ |
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105 } |
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106 |
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107 this.id = id; |
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108 } |
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109 |
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110 /** |
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111 * Tests whether this object is equal to another object. A handle object is |
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112 * only equal to another handle object with the same id and the same class. |
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113 * |
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114 * @param object |
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115 * The object with which to compare; may be <code>null</code>. |
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116 * @return <code>true</code> if the objects are equal; <code>false</code> |
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117 * otherwise. |
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118 */ |
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119 public override int opEquals(Object object) { |
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120 // Check if they're the same. |
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121 if (object is this) { |
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122 return true; |
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123 } |
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124 |
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125 // Check if they're the same type. |
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126 if (!(cast(HandleObject)object)) { |
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127 return false; |
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128 } |
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129 |
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130 // Check each property in turn. |
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131 final HandleObject handle= cast(HandleObject) object; |
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132 return Util.equals(id, handle.id) |
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133 && (this.classinfo is handle.classinfo); |
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134 } |
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135 |
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136 public /+override+/ final String getId() { |
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137 return id; |
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138 } |
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139 |
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140 /** |
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141 * Computes the hash code for this object based on the id. |
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142 * |
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143 * @return The hash code for this object. |
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144 */ |
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145 public final override hash_t toHash() { |
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146 if (hashCode is HASH_CODE_NOT_COMPUTED) { |
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147 hashCode = HASH_INITIAL * HASH_FACTOR + Util.toHash(id); |
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148 if (hashCode is HASH_CODE_NOT_COMPUTED) { |
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149 hashCode++; |
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150 } |
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151 } |
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152 return hashCode; |
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153 } |
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154 |
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155 /** |
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156 * Whether this instance is defined. A defined instance is one that has been |
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157 * fully initialized. This allows objects to effectively disappear even |
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158 * though other objects may still have references to them. |
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159 * |
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160 * @return <code>true</code> if this object is defined; <code>false</code> |
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161 * otherwise. |
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162 */ |
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163 public final bool isDefined() { |
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164 return defined; |
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165 } |
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166 |
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167 /** |
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168 * The string representation of this object -- for debugging purposes only. |
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169 * This string should not be shown to an end user. |
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170 * |
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171 * @return The string representation; never <code>null</code>. |
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172 */ |
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173 public override abstract String toString(); |
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174 |
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175 /** |
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176 * Makes this object becomes undefined. This method should make any defined |
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177 * properties <code>null</code>. It should also send notification to any |
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178 * listeners that these properties have changed. |
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179 */ |
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180 public abstract void undefine(); |
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181 } |