Mercurial > projects > dwt2
annotate org.eclipse.jface/src/org/eclipse/jface/bindings/CachedBindingSet.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, 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 module org.eclipse.jface.bindings.CachedBindingSet; |
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14 |
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15 import org.eclipse.jface.bindings.TriggerSequence; |
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16 import org.eclipse.jface.bindings.Binding; |
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17 |
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18 |
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19 import org.eclipse.jface.util.Util; |
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20 |
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21 import java.lang.all; |
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22 import java.util.Collection; |
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23 import java.util.Map; |
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24 import java.util.Set; |
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25 |
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26 /** |
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27 * <p> |
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28 * A resolution of bindings for a given state. To see if we already have a |
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29 * cached binding set, just create one of these binding sets and then look it up |
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30 * in a map. If it is not already there, then add it and set the cached binding |
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31 * resolution. |
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32 * </p> |
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33 * |
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34 * @since 3.1 |
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35 */ |
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36 final class CachedBindingSet { |
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37 |
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38 /** |
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39 * A factor for computing the hash code for all cached binding sets. |
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40 */ |
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41 private const static int HASH_FACTOR = 89; |
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42 |
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43 /** |
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44 * <p> |
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45 * A representation of the tree of active contexts at the time this cached |
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46 * binding set was computed. It is a map of context id (<code>String</code>) |
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47 * to context id (<code>String</code>). Each key represents one of the |
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48 * active contexts or one of its ancestors, while each value represents its |
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49 * parent. This is a way of perserving information about what the hierarchy |
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50 * looked like. |
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51 * </p> |
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52 * <p> |
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53 * This value will be <code>null</code> if the contexts were disregarded |
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54 * in the computation. It may also be empty. All of the keys are guaranteed |
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55 * to be non- <code>null</code>, but the values can be <code>null</code> |
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56 * (i.e., no parent). |
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57 * </p> |
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58 */ |
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59 private const Map activeContextTree; |
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60 |
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61 /** |
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62 * The map representing the resolved state of the bindings. This is a map of |
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63 * a trigger (<code>TriggerSequence</code>) to binding (<code>Binding</code>). |
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64 * This value may be <code>null</code> if it has not yet been initialized. |
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65 */ |
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66 private Map bindingsByTrigger = null; |
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67 |
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68 /** |
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69 * A map of triggers to collections of bindings. If this binding set |
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70 * contains conflicts, they are logged here. |
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71 * |
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72 * @since 3.3 |
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73 */ |
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74 private Map conflictsByTrigger = null; |
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75 |
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76 /** |
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77 * The hash code for this object. This value is computed lazily, and marked |
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78 * as invalid when one of the values on which it is based changes. |
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79 */ |
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80 private /+transient+/ int hashCode; |
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81 |
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82 /** |
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83 * Whether <code>hashCode</code> still contains a valid value. |
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84 */ |
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85 private /+transient+/ bool hashCodeComputed = false; |
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86 |
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87 /** |
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88 * <p> |
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89 * The list of locales that were active at the time this binding set was |
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90 * computed. This list starts with the most specific representation of the |
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91 * locale, and moves to more general representations. For example, this |
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92 * array might look like ["en_US", "en", "", null]. |
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93 * </p> |
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94 * <p> |
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95 * This value will never be <code>null</code>, and it will never be |
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96 * empty. It must contain at least one element, but its elements can be |
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97 * <code>null</code>. |
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98 * </p> |
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99 */ |
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100 private const String[] locales; |
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101 |
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102 /** |
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103 * <p> |
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104 * The list of platforms that were active at the time this binding set was |
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105 * computed. This list starts with the most specific representation of the |
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106 * platform, and moves to more general representations. For example, this |
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107 * array might look like ["gtk", "", null]. |
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108 * </p> |
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109 * <p> |
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110 * This value will never be <code>null</code>, and it will never be |
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111 * empty. It must contain at least one element, but its elements can be |
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112 * <code>null</code>. |
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113 * </p> |
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114 */ |
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115 private const String[] platforms; |
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116 |
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117 /** |
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118 * A map of prefixes (<code>TriggerSequence</code>) to a map of |
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119 * available completions (possibly <code>null</code>, which means there |
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120 * is an exact match). The available completions is a map of trigger (<code>TriggerSequence</code>) |
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121 * to command identifier (<code>String</code>). This value is |
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122 * <code>null</code> if it has not yet been initialized. |
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123 */ |
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124 private Map prefixTable = null; |
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125 |
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126 /** |
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127 * <p> |
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128 * The list of schemes that were active at the time this binding set was |
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129 * computed. This list starts with the active scheme, and then continues |
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130 * with all of its ancestors -- in order. For example, this might look like |
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131 * ["emacs", "default"]. |
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132 * </p> |
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133 * <p> |
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134 * This value will never be <code>null</code>, and it will never be |
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135 * empty. It must contain at least one element. Its elements cannot be |
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136 * <code>null</code>. |
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137 * </p> |
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138 */ |
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139 private const String[] schemeIds; |
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140 |
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141 /** |
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142 * The map representing the resolved state of the bindings. This is a map of |
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143 * a command id (<code>String</code>) to triggers (<code>Collection</code> |
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144 * of <code>TriggerSequence</code>). This value may be <code>null</code> |
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145 * if it has not yet been initialized. |
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146 */ |
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147 private Map triggersByCommandId = null; |
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148 |
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149 /** |
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150 * Constructs a new instance of <code>CachedBindingSet</code>. |
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151 * |
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152 * @param activeContextTree |
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153 * The set of context identifiers that were active when this |
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154 * binding set was calculated; may be empty. If it is |
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155 * <code>null</code>, then the contexts were disregarded in |
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156 * the computation. This is a map of context id ( |
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157 * <code>String</code>) to parent context id ( |
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158 * <code>String</code>). This is a way of caching the look of |
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159 * the context tree at the time the binding set was computed. |
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160 * @param locales |
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161 * The locales that were active when this binding set was |
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162 * calculated. The first element is the currently active locale, |
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163 * and it is followed by increasingly more general locales. This |
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164 * must not be <code>null</code> and must contain at least one |
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165 * element. The elements can be <code>null</code>, though. |
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166 * @param platforms |
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167 * The platform that were active when this binding set was |
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168 * calculated. The first element is the currently active |
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169 * platform, and it is followed by increasingly more general |
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170 * platforms. This must not be <code>null</code> and must |
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171 * contain at least one element. The elements can be |
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172 * <code>null</code>, though. |
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173 * @param schemeIds |
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174 * The scheme that was active when this binding set was |
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175 * calculated, followed by its ancestors. This may be |
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176 * <code>null</code or empty. The |
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177 * elements cannot be <code>null</code>. |
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178 */ |
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179 this(Map activeContextTree, String[] locales, |
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180 String[] platforms, String[] schemeIds) { |
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181 if (locales is null) { |
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182 throw new NullPointerException("The locales cannot be null."); //$NON-NLS-1$ |
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183 } |
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184 |
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185 if (locales.length is 0) { |
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186 throw new NullPointerException("The locales cannot be empty."); //$NON-NLS-1$ |
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187 } |
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188 |
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189 if (platforms is null) { |
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190 throw new NullPointerException("The platforms cannot be null."); //$NON-NLS-1$ |
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191 } |
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192 |
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193 if (platforms.length is 0) { |
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194 throw new NullPointerException("The platforms cannot be empty."); //$NON-NLS-1$ |
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195 } |
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196 |
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197 this.activeContextTree = activeContextTree; |
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198 this.locales = locales; |
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199 this.platforms = platforms; |
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200 this.schemeIds = schemeIds; |
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201 } |
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202 |
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203 /** |
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204 * Compares this binding set with another object. The objects will be equal |
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205 * if they are both instance of <code>CachedBindingSet</code> and have |
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206 * equivalent values for all of their properties. |
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207 * |
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208 * @param object |
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209 * The object with which to compare; may be <code>null</code>. |
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210 * @return <code>true</code> if they are both instances of |
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211 * <code>CachedBindingSet</code> and have the same values for all |
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212 * of their properties; <code>false</code> otherwise. |
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213 */ |
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214 public final override int opEquals(Object object) { |
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215 if (!(cast(CachedBindingSet)object )) { |
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216 return false; |
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217 } |
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218 |
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219 CachedBindingSet other = cast(CachedBindingSet) object; |
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220 |
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221 if (!Util.opEquals(cast(Object)activeContextTree, cast(Object)other.activeContextTree)) { |
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222 return false; |
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223 } |
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224 if (!Util.opEquals(locales, other.locales)) { |
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225 return false; |
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226 } |
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227 if (!Util.opEquals(platforms, other.platforms)) { |
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228 return false; |
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229 } |
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230 return Util.opEquals(schemeIds, other.schemeIds); |
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231 } |
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232 |
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233 /** |
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234 * Returns the map of command identifiers indexed by trigger sequence. |
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235 * |
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236 * @return A map of triggers (<code>TriggerSequence</code>) to bindings (<code>Binding</code>). |
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237 * This value may be <code>null</code> if this was not yet |
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238 * initialized. |
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239 */ |
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240 final Map getBindingsByTrigger() { |
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241 return bindingsByTrigger; |
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242 } |
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243 |
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244 /** |
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245 * Returns a map of conflicts for this set of contexts. |
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246 * |
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247 * @return A map of trigger to a collection of Bindings. May be |
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248 * <code>null</code>. |
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249 * @since 3.3 |
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250 */ |
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251 final Map getConflictsByTrigger() { |
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252 return conflictsByTrigger; |
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253 } |
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254 |
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255 /** |
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256 * Returns the map of prefixes to a map of trigger sequence to command |
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257 * identifiers. |
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258 * |
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259 * @return A map of prefixes (<code>TriggerSequence</code>) to a map of |
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260 * available completions (possibly <code>null</code>, which means |
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261 * there is an exact match). The available completions is a map of |
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262 * trigger (<code>TriggerSequence</code>) to command identifier (<code>String</code>). |
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263 * This value may be <code>null</code> if it has not yet been |
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264 * initialized. |
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265 */ |
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266 final Map getPrefixTable() { |
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267 return prefixTable; |
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268 } |
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269 |
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270 /** |
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271 * Returns the map of triggers indexed by command identifiers. |
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272 * |
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273 * @return A map of command identifiers (<code>String</code>) to |
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274 * triggers (<code>Collection</code> of |
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275 * <code>TriggerSequence</code>). This value may be |
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276 * <code>null</code> if this was not yet initialized. |
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277 */ |
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278 final Map getTriggersByCommandId() { |
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279 return triggersByCommandId; |
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280 } |
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281 |
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282 /** |
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283 * Computes the hash code for this cached binding set. The hash code is |
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284 * based only on the immutable values. This allows the set to be created and |
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285 * checked for in a hashed collection <em>before</em> doing any |
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286 * computation. |
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287 * |
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288 * @return The hash code for this cached binding set. |
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289 */ |
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290 public final override hash_t toHash() { |
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291 if (!hashCodeComputed) { |
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292 |
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293 auto HASH_INITIAL = java.lang.all.toHash(CachedBindingSet.classinfo.name ); |
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294 hashCode = HASH_INITIAL; |
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295 hashCode = hashCode * HASH_FACTOR |
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296 + Util.toHash(cast(Object)activeContextTree); |
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297 hashCode = hashCode * HASH_FACTOR + Util.toHash(locales); |
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298 hashCode = hashCode * HASH_FACTOR + Util.toHash(platforms); |
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299 hashCode = hashCode * HASH_FACTOR + Util.toHash(schemeIds); |
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300 hashCodeComputed = true; |
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301 } |
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302 |
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303 return hashCode; |
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304 } |
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305 |
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306 /** |
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307 * Sets the map of command identifiers indexed by trigger. |
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308 * |
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309 * @param commandIdsByTrigger |
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310 * The map to set; must not be <code>null</code>. This is a |
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311 * map of triggers (<code>TriggerSequence</code>) to binding (<code>Binding</code>). |
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312 */ |
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313 final void setBindingsByTrigger(Map commandIdsByTrigger) { |
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314 if (commandIdsByTrigger is null) { |
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315 throw new NullPointerException( |
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316 "Cannot set a null binding resolution"); //$NON-NLS-1$ |
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317 } |
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318 |
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319 this.bindingsByTrigger = commandIdsByTrigger; |
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320 } |
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321 |
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322 /** |
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323 * Sets the map of conflicting bindings by trigger. |
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324 * |
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325 * @param conflicts |
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326 * The map to set; must not be <code>null</code>. |
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327 * @since 3.3 |
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328 */ |
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329 final void setConflictsByTrigger(Map conflicts) { |
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330 if (conflicts is null) { |
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331 throw new NullPointerException( |
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332 "Cannot set a null binding conflicts"); //$NON-NLS-1$ |
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333 } |
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334 conflictsByTrigger = conflicts; |
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335 } |
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336 |
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337 /** |
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338 * Sets the map of prefixes to a map of trigger sequence to command |
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339 * identifiers. |
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340 * |
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341 * @param prefixTable |
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342 * A map of prefixes (<code>TriggerSequence</code>) to a map |
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343 * of available completions (possibly <code>null</code>, which |
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344 * means there is an exact match). The available completions is a |
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345 * map of trigger (<code>TriggerSequence</code>) to command |
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346 * identifier (<code>String</code>). Must not be |
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347 * <code>null</code>. |
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348 */ |
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349 final void setPrefixTable(Map prefixTable) { |
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350 if (prefixTable is null) { |
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351 throw new NullPointerException("Cannot set a null prefix table"); //$NON-NLS-1$ |
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352 } |
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353 |
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354 this.prefixTable = prefixTable; |
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355 } |
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356 |
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357 /** |
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358 * Sets the map of triggers indexed by command identifiers. |
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359 * |
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360 * @param triggersByCommandId |
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361 * The map to set; must not be <code>null</code>. This is a |
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362 * map of command identifiers (<code>String</code>) to |
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363 * triggers (<code>Collection</code> of |
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364 * <code>TriggerSequence</code>). |
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365 */ |
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366 final void setTriggersByCommandId(Map triggersByCommandId) { |
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367 if (triggersByCommandId is null) { |
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368 throw new NullPointerException( |
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369 "Cannot set a null binding resolution"); //$NON-NLS-1$ |
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370 } |
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371 |
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372 this.triggersByCommandId = triggersByCommandId; |
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373 } |
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374 } |