1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | |
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15 | package de.ugoe.cs.autoquest.tasktrees.temporalrelation; |
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16 | |
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17 | import java.io.Serializable; |
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18 | import java.util.ArrayList; |
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19 | import java.util.Arrays; |
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20 | import java.util.Collection; |
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21 | import java.util.HashMap; |
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22 | import java.util.Iterator; |
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23 | import java.util.LinkedList; |
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24 | import java.util.List; |
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25 | import java.util.Map; |
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26 | import java.util.Map.Entry; |
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27 | |
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28 | import de.ugoe.cs.autoquest.eventcore.Event; |
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29 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTask; |
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30 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTaskInstance; |
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31 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IIteration; |
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32 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IOptional; |
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33 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISelection; |
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34 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequence; |
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35 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask; |
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36 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
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37 | import de.ugoe.cs.autoquest.usageprofiles.SymbolMap; |
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38 | |
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39 | /** |
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40 | * <p> |
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41 | * This class is a data structure for holding task instances in form of a symbol map. It is more |
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42 | * efficient than a simple list. This data structure can be used with a comparator to adapt the |
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43 | * effective list behavior and to define the equals strategy for comparing task instances. After a |
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44 | * certain size ({@link #MAX_LIST_SIZE}), the map creates an index consisting of buckets of similar |
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45 | * task instances. This allows searching for task instances in a more efficient order as the search |
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46 | * can start in the most appropriate of the internal buckets. |
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47 | * </p> |
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48 | * <p> |
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49 | * The class is called a map, although it is not. It may contain the same task instances as |
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50 | * separate keys. This implementation is done for performance improvements. If it is required to |
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51 | * really assure, that a key exists only once, then each call to the |
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52 | * {@link #addSymbol(Object, Object)} method should be done only, if the |
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53 | * {@link #containsSymbol(Object)} method for the same symbol returns false. |
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54 | * </p> |
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55 | * |
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56 | * @see TaskComparator |
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57 | * |
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58 | * @author Patrick Harms |
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59 | * @param <V> |
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60 | */ |
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61 | class TaskSymbolBucketedMap<V> implements SymbolMap<ITask, V>, Serializable { |
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62 | |
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63 | /** |
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64 | * <p> |
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65 | * default serial version UID |
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66 | * </p> |
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67 | */ |
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68 | private static final long serialVersionUID = 1L; |
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69 | |
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70 | /** |
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71 | * <p> |
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72 | * the maximum number of task instances in this map which is still only treated as list |
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73 | * instead of using buckets. |
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74 | * </p> |
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75 | */ |
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76 | private static final int MAX_LIST_SIZE = 15; |
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77 | |
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78 | /** |
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79 | * <p> |
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80 | * the id of the default event bucket |
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81 | * </p> |
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82 | */ |
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83 | private static final int DEFAULT_EVENT_BUCKET_ID = 4; |
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84 | |
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85 | /** |
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86 | * <p> |
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87 | * the id of the default sequence bucket |
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88 | * </p> |
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89 | */ |
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90 | private static final int DEFAULT_SEQUENCE_BUCKET_ID = 0; |
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91 | |
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92 | /** |
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93 | * <p> |
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94 | * the id of the default selection bucket |
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95 | * </p> |
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96 | */ |
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97 | private static final int DEFAULT_SELECTION_BUCKET_ID = 1; |
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98 | |
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99 | /** |
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100 | * <p> |
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101 | * the id of the default iteration bucket |
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102 | * </p> |
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103 | */ |
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104 | private static final int DEFAULT_ITERATION_BUCKET_ID = 2; |
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105 | |
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106 | /** |
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107 | * <p> |
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108 | * the id of the default optional bucket |
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109 | * </p> |
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110 | */ |
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111 | private static final int DEFAULT_OPTIONAL_BUCKET_ID = 3; |
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112 | |
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113 | /** |
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114 | * <p> |
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115 | * the default bucket search order for events |
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116 | * </p> |
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117 | */ |
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118 | private static final int[] DEFAULT_EVENT_BUCKET_SEARCH_ORDER = new int[] |
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119 | { DEFAULT_EVENT_BUCKET_ID, DEFAULT_ITERATION_BUCKET_ID, DEFAULT_OPTIONAL_BUCKET_ID, |
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120 | DEFAULT_SELECTION_BUCKET_ID }; |
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121 | |
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122 | /** |
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123 | * <p> |
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124 | * the default bucket search order for sequences |
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125 | * </p> |
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126 | */ |
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127 | private static final int[] DEFAULT_SEQUENCE_BUCKET_SEARCH_ORDER = new int[] |
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128 | { DEFAULT_SEQUENCE_BUCKET_ID, DEFAULT_ITERATION_BUCKET_ID, DEFAULT_OPTIONAL_BUCKET_ID, |
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129 | DEFAULT_SELECTION_BUCKET_ID }; |
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130 | |
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131 | /** |
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132 | * <p> |
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133 | * the default bucket search order for selection |
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134 | * </p> |
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135 | */ |
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136 | private static final int[] DEFAULT_SELECTION_BUCKET_SEARCH_ORDER = new int[] |
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137 | { DEFAULT_SELECTION_BUCKET_ID, DEFAULT_EVENT_BUCKET_ID, DEFAULT_ITERATION_BUCKET_ID, |
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138 | DEFAULT_OPTIONAL_BUCKET_ID, DEFAULT_SEQUENCE_BUCKET_ID }; |
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139 | |
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140 | /** |
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141 | * <p> |
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142 | * the default bucket search order for iterations |
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143 | * </p> |
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144 | */ |
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145 | private static final int[] DEFAULT_ITERATION_BUCKET_SEARCH_ORDER = new int[] |
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146 | { DEFAULT_ITERATION_BUCKET_ID, DEFAULT_OPTIONAL_BUCKET_ID, DEFAULT_SELECTION_BUCKET_ID, |
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147 | DEFAULT_EVENT_BUCKET_ID, DEFAULT_SEQUENCE_BUCKET_ID }; |
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148 | |
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149 | /** |
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150 | * <p> |
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151 | * the default bucket search order for optional |
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152 | * </p> |
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153 | */ |
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154 | private static final int[] DEFAULT_OPTIONAL_BUCKET_SEARCH_ORDER = new int[] |
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155 | { DEFAULT_OPTIONAL_BUCKET_ID, DEFAULT_EVENT_BUCKET_ID, DEFAULT_ITERATION_BUCKET_ID, |
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156 | DEFAULT_SELECTION_BUCKET_ID, DEFAULT_SEQUENCE_BUCKET_ID }; |
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157 | |
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158 | /** |
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159 | * <p> |
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160 | * Comparator to be used for comparing the task instances with each other |
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161 | * </p> |
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162 | */ |
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163 | private TaskComparator comparator; |
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164 | |
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165 | /** |
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166 | * <p> |
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167 | * Internally maintained plain list of task instances and associated values |
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168 | * </p> |
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169 | */ |
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170 | private List<Map.Entry<ITask, V>> symbolList; |
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171 | |
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172 | /** |
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173 | * <p> |
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174 | * If the size of the map exceeds {@link #MAX_LIST_SIZE}, this is the index using buckets |
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175 | * for optimizing the search order. |
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176 | * </p> |
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177 | */ |
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178 | private Map<Integer, List<Map.Entry<ITask, V>>> symbolBuckets; |
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179 | |
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180 | /** |
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181 | * <p> |
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182 | * When using buckets, not any task instance may be associated a correct bucket. Therefore, we |
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183 | * set a default bucket for all such task instances. This may change if the same bucket for a |
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184 | * specific symbol is selected. |
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185 | * </p> |
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186 | */ |
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187 | private int defaultBucket = 0; |
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188 | |
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189 | /** |
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190 | * <p> |
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191 | * the adjustable bucket search order for events. This array is initialized for reuse as |
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192 | * otherwise for any lookup of a bucket search order for an individual event, this array would |
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193 | * be recreated. |
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194 | * </p> |
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195 | */ |
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196 | private final int[] ADJUSTABLE_EVENT_SPECIFIC_BUCKET_SEARCH_ORDER = new int[] |
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197 | { 0, 0, DEFAULT_ITERATION_BUCKET_ID, DEFAULT_OPTIONAL_BUCKET_ID, DEFAULT_EVENT_BUCKET_ID, |
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198 | DEFAULT_SELECTION_BUCKET_ID }; |
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199 | |
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200 | /** |
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201 | * <p> |
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202 | * Instantiates a task instance map with a comparator |
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203 | * </p> |
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204 | * |
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205 | * @param comparator the comparator to use for comparing task instances |
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206 | * |
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207 | * @throws IllegalArgumentException if the provided comparator is null |
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208 | */ |
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209 | public TaskSymbolBucketedMap(TaskComparator comparator) { |
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210 | if (comparator == null) { |
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211 | throw new IllegalArgumentException("comparator must not be null"); |
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212 | } |
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213 | |
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214 | this.comparator = comparator; |
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215 | this.symbolList = new ArrayList<Map.Entry<ITask, V>>(); |
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216 | } |
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217 | |
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218 | /** |
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219 | * <p> |
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220 | * Copy constructor |
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221 | * </p> |
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222 | * |
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223 | * @param otherMap the other map to be copied including its comparator |
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224 | * |
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225 | * @throws IllegalArgumentException if the provided other map is null |
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226 | */ |
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227 | public TaskSymbolBucketedMap(TaskSymbolBucketedMap<V> otherMap) { |
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228 | if (otherMap == null) { |
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229 | throw new IllegalArgumentException("otherMap must not be null"); |
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230 | } |
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231 | |
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232 | this.comparator = otherMap.comparator; |
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233 | this.symbolList = new ArrayList<Map.Entry<ITask, V>>(otherMap.symbolList); |
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234 | |
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235 | if (this.symbolList.size() > MAX_LIST_SIZE) { |
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236 | createSymbolBuckets(); |
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237 | } |
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238 | } |
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239 | |
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240 | /** |
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241 | * <p> |
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242 | * Returns the size of the map, i.e. the number of task instance entries |
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243 | * </p> |
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244 | * |
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245 | * @return as described |
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246 | */ |
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247 | public int size() { |
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248 | return symbolList.size(); |
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249 | } |
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250 | |
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251 | /** |
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252 | * <p> |
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253 | * Returns true if this map is empty, i.e. if {@link #size()} returns 0 |
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254 | * </p> |
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255 | * |
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256 | * @return as described |
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257 | */ |
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258 | public boolean isEmpty() { |
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259 | return symbolList.isEmpty(); |
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260 | } |
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261 | |
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262 | /** |
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263 | * <p> |
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264 | * Returns true if the provided task instance was stored in this map. |
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265 | * </p> |
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266 | * |
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267 | * @param symbol the task instance to check if it was stored in this map |
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268 | * |
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269 | * @return as described |
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270 | * |
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271 | * @throws IllegalArgumentException if the provided task instance is null |
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272 | */ |
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273 | public boolean containsSymbol(ITask symbol) { |
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274 | if (symbol == null) { |
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275 | throw new IllegalArgumentException("symbol must not be null"); |
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276 | } |
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277 | |
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278 | return getEntry(symbol) != null; |
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279 | } |
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280 | |
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281 | /** |
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282 | * <p> |
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283 | * Returns the value associated to the provided task instance in this map. If there is no value |
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284 | * associated to the given task instance or if the task instance is not stored in this map, |
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285 | * the method returns null. |
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286 | * </p> |
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287 | * |
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288 | * @param symbol the task instance to return the value for |
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289 | * |
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290 | * @return as described |
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291 | * |
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292 | * @throws IllegalArgumentException if the provided task instance is null |
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293 | */ |
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294 | public V getValue(ITask symbol) { |
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295 | if (symbol == null) { |
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296 | throw new IllegalArgumentException("symbol must not be null"); |
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297 | } |
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298 | |
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299 | Map.Entry<ITask, V> entry = getEntry(symbol); |
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300 | |
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301 | if (entry != null) { |
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302 | return entry.getValue(); |
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303 | } |
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304 | else { |
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305 | return null; |
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306 | } |
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307 | } |
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308 | |
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309 | /** |
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310 | * <p> |
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311 | * Adds a task instance and an associated value to the map. If the value is null, the task |
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312 | * instance is added, anyway and {@link #containsSymbol(Object)} will return true for that |
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313 | * task instance. Adding the same task instance twice will produce two entries. This is |
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314 | * contradictory to typical map implementations. To prevent this, the |
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315 | * {@link #containsSymbol(Object)} and {@link #removeSymbol(Object)} methods should be used to |
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316 | * ensure map behavior. |
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317 | * </p> |
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318 | * |
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319 | * @param symbol the task instance to add to the map |
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320 | * @param value the value to associate to the task instance in this map |
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321 | * |
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322 | * @return as described |
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323 | * |
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324 | * @throws IllegalArgumentException if the provided task instance is null |
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325 | */ |
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326 | public void addSymbol(ITask symbol, V value) { |
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327 | if (symbol == null) { |
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328 | throw new IllegalArgumentException("symbol must not be null"); |
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329 | } |
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330 | |
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331 | Map.Entry<ITask, V> entry = new SymbolMapEntry(symbol, value); |
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332 | |
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333 | symbolList.add(entry); |
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334 | |
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335 | if (symbolList.size() > MAX_LIST_SIZE) { |
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336 | if (symbolBuckets == null) { |
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337 | createSymbolBuckets(); |
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338 | } |
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339 | else { |
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340 | addToSymbolBucket(entry); |
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341 | } |
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342 | } |
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343 | } |
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344 | |
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345 | /** |
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346 | * <p> |
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347 | * Removes a task instance and its associated value from the map. If the task instance is |
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348 | * stored several times, only the first of its occurrences is removed. |
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349 | * </p> |
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350 | * |
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351 | * @param symbol the task instance to be removed from the map |
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352 | * |
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353 | * @return as described |
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354 | * |
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355 | * @throws IllegalArgumentException if the provided task instance is null |
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356 | */ |
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357 | public V removeSymbol(ITask symbol) { |
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358 | if (symbol == null) { |
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359 | throw new IllegalArgumentException("symbol must not be null"); |
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360 | } |
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361 | |
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362 | for (int i = 0; i < symbolList.size(); i++) { |
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363 | if (comparator.equals(symbolList.get(i).getKey(), symbol)) { |
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364 | // found the symbol. Remove it from the list, and if required, also from the map. |
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365 | V value = symbolList.remove(i).getValue(); |
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366 | |
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367 | if (symbolList.size() > MAX_LIST_SIZE) { |
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368 | removeFromSymbolBuckets(symbol); |
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369 | } |
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370 | |
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371 | return value; |
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372 | } |
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373 | } |
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374 | |
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375 | return null; |
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376 | } |
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377 | |
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378 | /** |
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379 | * <p> |
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380 | * Returns a collection of all task instances in this map. |
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381 | * </p> |
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382 | * |
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383 | * @return as described |
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384 | */ |
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385 | public Collection<ITask> getSymbols() { |
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386 | return new ReadOnlyCollectionFacade<ITask>(symbolList, new SymbolFacade()); |
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387 | } |
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388 | |
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389 | /** |
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390 | * <p> |
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391 | * Returns a collection of all values associated to task instances in this map. May contain |
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392 | * null values, if some of the task instances are mapped to null. The length of the returned |
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393 | * collection is in any case the same as the size of the map. |
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394 | * </p> |
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395 | * |
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396 | * @return as described |
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397 | */ |
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398 | public Collection<V> getValues() { |
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399 | return new ReadOnlyCollectionFacade<V>(symbolList, new ValueFacade()); |
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400 | } |
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401 | |
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402 | /** |
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403 | * <p> |
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404 | * Removes all task instances and associated values from the map. |
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405 | * </p> |
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406 | */ |
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407 | public void clear() { |
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408 | symbolList.clear(); |
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409 | symbolBuckets = null; |
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410 | } |
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411 | |
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412 | /* (non-Javadoc) |
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413 | * @see java.lang.Object#hashCode() |
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414 | */ |
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415 | @Override |
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416 | public int hashCode() { |
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417 | return symbolList.size(); |
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418 | } |
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419 | |
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420 | /* (non-Javadoc) |
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421 | * @see java.lang.Object#equals(java.lang.Object) |
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422 | */ |
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423 | @SuppressWarnings("unchecked") |
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424 | @Override |
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425 | public boolean equals(Object obj) { |
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426 | if (this == obj) { |
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427 | return true; |
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428 | } |
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429 | else if (this.getClass().isInstance(obj)) { |
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430 | TaskSymbolBucketedMap<V> other = (TaskSymbolBucketedMap<V>) obj; |
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431 | |
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432 | return (symbolList.size() == other.symbolList.size()) && |
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433 | (symbolList.containsAll(other.symbolList)); |
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434 | } |
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435 | else { |
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436 | return false; |
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437 | } |
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438 | } |
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439 | |
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440 | /** |
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441 | * <p> |
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442 | * Internally used to create task instance buckets in case the number of stored task instances |
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443 | * increased above {@link #MAX_LIST_SIZE}. |
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444 | * </p> |
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445 | */ |
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446 | private void createSymbolBuckets() { |
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447 | symbolBuckets = new HashMap<Integer, List<Map.Entry<ITask, V>>>(); |
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448 | |
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449 | for (Map.Entry<ITask, V> symbol : symbolList) { |
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450 | addToSymbolBucket(symbol); |
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451 | } |
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452 | } |
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453 | |
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454 | /** |
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455 | * <p> |
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456 | * Adds a task instance and its value to its corresponding bucket. The corresponding bucket is |
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457 | * the first element of the array returned by the method |
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458 | * {@link #getBucketSearchOrder(ITaskInstance)}. If no search order for a task instance is |
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459 | * defined, the entry is added to the default bucket. If the bucket id identical to the default |
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460 | * bucket id, the default bucket id is shifted to another value. |
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461 | * </p> |
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462 | */ |
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463 | private void addToSymbolBucket(Map.Entry<ITask, V> symbolEntry) { |
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464 | int bucketId = defaultBucket; |
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465 | int[] bucketSearchOrder = getBucketSearchOrder(symbolEntry.getKey()); |
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466 | |
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467 | if ((bucketSearchOrder != null) && (bucketSearchOrder.length > 0)) { |
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468 | bucketId = bucketSearchOrder[0]; |
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469 | |
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470 | if (bucketId == defaultBucket) { |
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471 | setNewDefaultBucketId(); |
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472 | } |
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473 | } |
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474 | |
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475 | List<Map.Entry<ITask, V>> list = symbolBuckets.get(bucketId); |
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476 | |
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477 | if (list == null) { |
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478 | list = new LinkedList<Map.Entry<ITask, V>>(); |
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479 | symbolBuckets.put(bucketId, list); |
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480 | } |
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481 | |
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482 | list.add(symbolEntry); |
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483 | } |
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484 | |
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485 | /** |
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486 | * <p> |
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487 | * returns the search order for a task instance which is different for event task instances, |
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488 | * sequence instances, selection instances, and iteration instances |
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489 | * </p> |
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490 | */ |
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491 | private int[] getBucketSearchOrder(ITask task) { |
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492 | // 0 = sequence; 1 = selection; 2 = iteration; 3 = optional; 4 = event task in general; |
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493 | // other = hashCode of name of event type |
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494 | |
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495 | if (task instanceof IEventTask) { |
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496 | // event tasks are most likely equal to those of the same type happening on the same |
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497 | // target. Afterwards, they should be equal to those of the event type with the same |
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498 | // name. Afterwards, they may be equal to iterations, optionals, other event tasks, |
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499 | // selections, and finally the rest. |
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500 | |
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501 | Collection<ITaskInstance> instances = task.getInstances(); |
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502 | |
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503 | if (instances.size() > 0) { |
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504 | Event event = ((IEventTaskInstance) instances.iterator().next()).getEvent(); |
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505 | |
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506 | ADJUSTABLE_EVENT_SPECIFIC_BUCKET_SEARCH_ORDER[0] = |
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507 | event.getTarget().hashCode() + event.getType().getName().hashCode(); |
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508 | ADJUSTABLE_EVENT_SPECIFIC_BUCKET_SEARCH_ORDER[1] = |
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509 | event.getType().getName().hashCode(); |
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510 | |
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511 | return ADJUSTABLE_EVENT_SPECIFIC_BUCKET_SEARCH_ORDER; |
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512 | } |
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513 | else { |
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514 | return DEFAULT_EVENT_BUCKET_SEARCH_ORDER; |
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515 | } |
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516 | } |
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517 | else if (task instanceof ISequence) { |
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518 | return DEFAULT_SEQUENCE_BUCKET_SEARCH_ORDER; |
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519 | } |
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520 | else if (task instanceof ISelection) { |
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521 | return DEFAULT_SELECTION_BUCKET_SEARCH_ORDER; |
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522 | } |
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523 | else if (task instanceof IIteration) { |
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524 | return DEFAULT_ITERATION_BUCKET_SEARCH_ORDER; |
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525 | } |
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526 | else if (task instanceof IOptional) { |
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527 | return DEFAULT_OPTIONAL_BUCKET_SEARCH_ORDER; |
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528 | } |
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529 | |
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530 | return null; |
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531 | } |
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532 | |
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533 | /** |
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534 | * <p> |
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535 | * Removes the entry for a given task instance from the buckets. It uses the bucket search order |
---|
536 | * defined to find the task instance as fast as possible. |
---|
537 | * </p> |
---|
538 | */ |
---|
539 | private Map.Entry<ITask, V> removeFromSymbolBuckets(ITask symbol) { |
---|
540 | int bucketId = defaultBucket; |
---|
541 | int[] bucketSearchOrder = getBucketSearchOrder(symbol); |
---|
542 | |
---|
543 | if ((bucketSearchOrder != null) && (bucketSearchOrder.length > 0)) { |
---|
544 | bucketId = bucketSearchOrder[0]; |
---|
545 | } |
---|
546 | |
---|
547 | List<Map.Entry<ITask, V>> list = symbolBuckets.get(bucketId); |
---|
548 | Map.Entry<ITask, V> result = null; |
---|
549 | |
---|
550 | if (list != null) { |
---|
551 | for (int i = 0; i < list.size(); i++) { |
---|
552 | if (comparator.equals(list.get(i).getKey(), symbol)) { |
---|
553 | result = list.remove(i); |
---|
554 | break; |
---|
555 | } |
---|
556 | } |
---|
557 | |
---|
558 | if (list.isEmpty()) { |
---|
559 | symbolBuckets.remove(bucketId); |
---|
560 | } |
---|
561 | } |
---|
562 | |
---|
563 | return result; |
---|
564 | } |
---|
565 | |
---|
566 | /** |
---|
567 | * <p> |
---|
568 | * Updates the default bucket id to a new one |
---|
569 | * </p> |
---|
570 | */ |
---|
571 | private void setNewDefaultBucketId() { |
---|
572 | int oldDefaultBucket = defaultBucket; |
---|
573 | do { |
---|
574 | defaultBucket += 1; |
---|
575 | } |
---|
576 | while (symbolBuckets.containsKey(defaultBucket)); |
---|
577 | |
---|
578 | symbolBuckets.put(defaultBucket, symbolBuckets.remove(oldDefaultBucket)); |
---|
579 | } |
---|
580 | |
---|
581 | /** |
---|
582 | * <p> |
---|
583 | * searches for the entry belonging to the given task instance. The method either uses the |
---|
584 | * list if buckets are not used yet, or it uses the buckets and searches them in the order |
---|
585 | * defined by the method {@link #getBucketSearchOrder(ITaskInstance)}. If the task instances |
---|
586 | * isn't found and the bucket search order does not refer all buckets, then also the other |
---|
587 | * buckets are searched for the task instance. |
---|
588 | * </p> |
---|
589 | */ |
---|
590 | private Map.Entry<ITask, V> getEntry(ITask symbol) { |
---|
591 | Map.Entry<ITask, V> entry = null; |
---|
592 | if (symbolBuckets == null) { |
---|
593 | entry = lookup(symbol, symbolList); |
---|
594 | } |
---|
595 | else { |
---|
596 | int[] bucketSearchOrder = getBucketSearchOrder(symbol); |
---|
597 | for (int bucketId : bucketSearchOrder) { |
---|
598 | List<Map.Entry<ITask, V>> list = symbolBuckets.get(bucketId); |
---|
599 | if (list != null) { |
---|
600 | entry = lookup(symbol, list); |
---|
601 | if (entry != null) { |
---|
602 | break; |
---|
603 | } |
---|
604 | } |
---|
605 | } |
---|
606 | |
---|
607 | // try to search the other buckets (may be required, if bucket separation given by |
---|
608 | // bucket ids is different from logical bucket separation of comparator |
---|
609 | if (entry == null) { |
---|
610 | // create a copy of the search order to be able to sort and afterwards binary |
---|
611 | // search it. The original version MUST NOT BE SORTED. |
---|
612 | int[] bucketSearchOrderCopy = |
---|
613 | Arrays.copyOf(bucketSearchOrder, bucketSearchOrder.length); |
---|
614 | |
---|
615 | Arrays.sort(bucketSearchOrderCopy); |
---|
616 | for (Map.Entry<Integer, List<Map.Entry<ITask, V>>> bucket : symbolBuckets.entrySet()) { |
---|
617 | if (Arrays.binarySearch(bucketSearchOrderCopy, bucket.getKey()) < 0) { |
---|
618 | List<Map.Entry<ITask, V>> list = bucket.getValue(); |
---|
619 | if (list != null) { |
---|
620 | entry = lookup(symbol, list); |
---|
621 | if (entry != null) { |
---|
622 | break; |
---|
623 | } |
---|
624 | } |
---|
625 | } |
---|
626 | } |
---|
627 | } |
---|
628 | } |
---|
629 | |
---|
630 | return entry; |
---|
631 | } |
---|
632 | |
---|
633 | /** |
---|
634 | * <p> |
---|
635 | * Convenience method to look up a symbol in a list of entries using the comparator. |
---|
636 | * </p> |
---|
637 | */ |
---|
638 | private Map.Entry<ITask, V> lookup(ITask symbol, List<Map.Entry<ITask, V>> list) { |
---|
639 | for (Map.Entry<ITask, V> candidate : list) { |
---|
640 | if (comparator.equals(candidate.getKey(), symbol)) { |
---|
641 | return candidate; |
---|
642 | } |
---|
643 | } |
---|
644 | |
---|
645 | return null; |
---|
646 | } |
---|
647 | |
---|
648 | /** |
---|
649 | * <p> |
---|
650 | * Internally used data structure for storing task instance - value pairs |
---|
651 | * </p> |
---|
652 | * |
---|
653 | * @author Patrick Harms |
---|
654 | */ |
---|
655 | private class SymbolMapEntry implements Map.Entry<ITask, V> { |
---|
656 | |
---|
657 | /** |
---|
658 | * the task instance to map to a value |
---|
659 | */ |
---|
660 | private ITask symbol; |
---|
661 | |
---|
662 | /** |
---|
663 | * the value associated with the symbol |
---|
664 | */ |
---|
665 | private V value; |
---|
666 | |
---|
667 | /** |
---|
668 | * <p> |
---|
669 | * Simple constructor for initializing the entry with a task instance and its associated |
---|
670 | * value. |
---|
671 | * </p> |
---|
672 | */ |
---|
673 | private SymbolMapEntry(ITask symbol, V value) { |
---|
674 | super(); |
---|
675 | this.symbol = symbol; |
---|
676 | this.value = value; |
---|
677 | } |
---|
678 | |
---|
679 | /* (non-Javadoc) |
---|
680 | * @see java.util.Map.Entry#getKey() |
---|
681 | */ |
---|
682 | @Override |
---|
683 | public ITask getKey() { |
---|
684 | return symbol; |
---|
685 | } |
---|
686 | |
---|
687 | /* (non-Javadoc) |
---|
688 | * @see java.util.Map.Entry#getValue() |
---|
689 | */ |
---|
690 | @Override |
---|
691 | public V getValue() { |
---|
692 | return value; |
---|
693 | } |
---|
694 | |
---|
695 | /* (non-Javadoc) |
---|
696 | * @see java.util.Map.Entry#setValue(java.lang.Object) |
---|
697 | */ |
---|
698 | @Override |
---|
699 | public V setValue(V value) { |
---|
700 | V oldValue = this.value; |
---|
701 | this.value = value; |
---|
702 | return oldValue; |
---|
703 | } |
---|
704 | |
---|
705 | /* (non-Javadoc) |
---|
706 | * @see java.lang.Object#hashCode() |
---|
707 | */ |
---|
708 | @Override |
---|
709 | public int hashCode() { |
---|
710 | return symbol.hashCode(); |
---|
711 | } |
---|
712 | |
---|
713 | /* (non-Javadoc) |
---|
714 | * @see java.lang.Object#equals(java.lang.Object) |
---|
715 | */ |
---|
716 | @SuppressWarnings("unchecked") |
---|
717 | @Override |
---|
718 | public boolean equals(Object obj) { |
---|
719 | if (this == obj) { |
---|
720 | return true; |
---|
721 | } |
---|
722 | else if (this.getClass().isInstance(obj)) { |
---|
723 | SymbolMapEntry other = (SymbolMapEntry) obj; |
---|
724 | return (symbol.equals(other.symbol) && |
---|
725 | (value == null ? other.value == null : value.equals(other.value))); |
---|
726 | } |
---|
727 | else { |
---|
728 | return false; |
---|
729 | } |
---|
730 | } |
---|
731 | |
---|
732 | /* (non-Javadoc) |
---|
733 | * @see java.lang.Object#toString() |
---|
734 | */ |
---|
735 | @Override |
---|
736 | public String toString() { |
---|
737 | return symbol + "=" + value; |
---|
738 | } |
---|
739 | |
---|
740 | } |
---|
741 | |
---|
742 | /** |
---|
743 | * <p> |
---|
744 | * Used to create an efficient facade for accessing the internal list of entries either only |
---|
745 | * for the task instances or only for the values. It is a default implementation of the |
---|
746 | * collection interface. The entry facade provided to the constructor decides, if either the |
---|
747 | * list accesses only the task instances or only the values. |
---|
748 | * </p> |
---|
749 | * |
---|
750 | * @author Patrick Harms |
---|
751 | */ |
---|
752 | private class ReadOnlyCollectionFacade<TYPE> implements Collection<TYPE> { |
---|
753 | |
---|
754 | /** |
---|
755 | * the list facaded by this facade |
---|
756 | */ |
---|
757 | private List<Map.Entry<ITask, V>> list; |
---|
758 | |
---|
759 | /** |
---|
760 | * the facade to be used for the entries |
---|
761 | */ |
---|
762 | private EntryFacade<TYPE> entryFacade; |
---|
763 | |
---|
764 | /** |
---|
765 | * <p> |
---|
766 | * Initializes the facade with the facaded list and the facade to be used for the entries |
---|
767 | * </p> |
---|
768 | */ |
---|
769 | private ReadOnlyCollectionFacade(List<Map.Entry<ITask, V>> list, |
---|
770 | EntryFacade<TYPE> entryFacade) |
---|
771 | { |
---|
772 | this.list = list; |
---|
773 | this.entryFacade = entryFacade; |
---|
774 | } |
---|
775 | |
---|
776 | /* (non-Javadoc) |
---|
777 | * @see java.util.Collection#size() |
---|
778 | */ |
---|
779 | @Override |
---|
780 | public int size() { |
---|
781 | return list.size(); |
---|
782 | } |
---|
783 | |
---|
784 | /* (non-Javadoc) |
---|
785 | * @see java.util.Collection#isEmpty() |
---|
786 | */ |
---|
787 | @Override |
---|
788 | public boolean isEmpty() { |
---|
789 | return list.isEmpty(); |
---|
790 | } |
---|
791 | |
---|
792 | /* (non-Javadoc) |
---|
793 | * @see java.util.Collection#contains(java.lang.Object) |
---|
794 | */ |
---|
795 | @Override |
---|
796 | public boolean contains(Object o) { |
---|
797 | if (o == null) { |
---|
798 | for (Map.Entry<ITask, V> entry : list) { |
---|
799 | if (entryFacade.getFacadedElement(entry) == null) { |
---|
800 | return true; |
---|
801 | } |
---|
802 | } |
---|
803 | } |
---|
804 | else { |
---|
805 | for (Map.Entry<ITask, V> entry : list) { |
---|
806 | if (o.equals(entryFacade.getFacadedElement(entry))) { |
---|
807 | return true; |
---|
808 | } |
---|
809 | } |
---|
810 | } |
---|
811 | |
---|
812 | return false; |
---|
813 | } |
---|
814 | |
---|
815 | /* (non-Javadoc) |
---|
816 | * @see java.util.Collection#toArray() |
---|
817 | */ |
---|
818 | @Override |
---|
819 | public Object[] toArray() { |
---|
820 | Object[] result = new Object[list.size()]; |
---|
821 | |
---|
822 | for (int i = 0; i < list.size(); i++) { |
---|
823 | result[i] = entryFacade.getFacadedElement(list.get(i)); |
---|
824 | } |
---|
825 | |
---|
826 | return result; |
---|
827 | } |
---|
828 | |
---|
829 | /* (non-Javadoc) |
---|
830 | * @see java.util.Collection#toArray(T[]) |
---|
831 | */ |
---|
832 | @SuppressWarnings("unchecked") |
---|
833 | @Override |
---|
834 | public <T> T[] toArray(T[] a) { |
---|
835 | T[] result = a; |
---|
836 | |
---|
837 | for (int i = 0; i < list.size(); i++) { |
---|
838 | result[i] = (T) entryFacade.getFacadedElement(list.get(i)); |
---|
839 | } |
---|
840 | |
---|
841 | return result; |
---|
842 | } |
---|
843 | |
---|
844 | /* (non-Javadoc) |
---|
845 | * @see java.util.Collection#add(java.lang.Object) |
---|
846 | */ |
---|
847 | @Override |
---|
848 | public boolean add(TYPE e) { |
---|
849 | throw new UnsupportedOperationException("this collection is read only"); |
---|
850 | } |
---|
851 | |
---|
852 | /* (non-Javadoc) |
---|
853 | * @see java.util.Collection#remove(java.lang.Object) |
---|
854 | */ |
---|
855 | @Override |
---|
856 | public boolean remove(Object o) { |
---|
857 | throw new UnsupportedOperationException("this collection is read only"); |
---|
858 | } |
---|
859 | |
---|
860 | /* (non-Javadoc) |
---|
861 | * @see java.util.Collection#containsAll(java.util.Collection) |
---|
862 | */ |
---|
863 | @Override |
---|
864 | public boolean containsAll(Collection<?> c) { |
---|
865 | for (Object candidate : c) { |
---|
866 | if (!contains(candidate)) { |
---|
867 | return false; |
---|
868 | } |
---|
869 | } |
---|
870 | |
---|
871 | return true; |
---|
872 | } |
---|
873 | |
---|
874 | /* (non-Javadoc) |
---|
875 | * @see java.util.Collection#addAll(java.util.Collection) |
---|
876 | */ |
---|
877 | @Override |
---|
878 | public boolean addAll(Collection<? extends TYPE> c) { |
---|
879 | throw new UnsupportedOperationException("this collection is read only"); |
---|
880 | } |
---|
881 | |
---|
882 | /* (non-Javadoc) |
---|
883 | * @see java.util.Collection#removeAll(java.util.Collection) |
---|
884 | */ |
---|
885 | @Override |
---|
886 | public boolean removeAll(Collection<?> c) { |
---|
887 | throw new UnsupportedOperationException("this collection is read only"); |
---|
888 | } |
---|
889 | |
---|
890 | /* (non-Javadoc) |
---|
891 | * @see java.util.Collection#retainAll(java.util.Collection) |
---|
892 | */ |
---|
893 | @Override |
---|
894 | public boolean retainAll(Collection<?> c) { |
---|
895 | throw new UnsupportedOperationException("this collection is read only"); |
---|
896 | } |
---|
897 | |
---|
898 | /* (non-Javadoc) |
---|
899 | * @see java.util.Collection#clear() |
---|
900 | */ |
---|
901 | @Override |
---|
902 | public void clear() { |
---|
903 | throw new UnsupportedOperationException("this collection is read only"); |
---|
904 | } |
---|
905 | |
---|
906 | /* (non-Javadoc) |
---|
907 | * @see java.util.Collection#iterator() |
---|
908 | */ |
---|
909 | @Override |
---|
910 | public Iterator<TYPE> iterator() { |
---|
911 | return new ReadOnlyCollectionIteratorFacade<TYPE>(list.iterator(), entryFacade); |
---|
912 | } |
---|
913 | |
---|
914 | } |
---|
915 | |
---|
916 | /** |
---|
917 | * <p> |
---|
918 | * Implementation of an iterator to facade an iterator on the internal list of task instance |
---|
919 | * entries. |
---|
920 | * </p> |
---|
921 | * |
---|
922 | * @author Patrick Harms |
---|
923 | */ |
---|
924 | private class ReadOnlyCollectionIteratorFacade<TYPE> implements Iterator<TYPE> { |
---|
925 | |
---|
926 | /** |
---|
927 | * the facaded iterator |
---|
928 | */ |
---|
929 | private Iterator<Map.Entry<ITask, V>> iterator; |
---|
930 | |
---|
931 | /** |
---|
932 | * the facade for the entries provided by the facaded iterator |
---|
933 | */ |
---|
934 | private EntryFacade<TYPE> entryFacade; |
---|
935 | |
---|
936 | /** |
---|
937 | * <p> |
---|
938 | * initialized this facade with the facaded iterator and the entry facade to be used for |
---|
939 | * the entries. |
---|
940 | * </p> |
---|
941 | */ |
---|
942 | private ReadOnlyCollectionIteratorFacade(Iterator<Map.Entry<ITask, V>> iterator, |
---|
943 | EntryFacade<TYPE> entryFacade) |
---|
944 | { |
---|
945 | this.iterator = iterator; |
---|
946 | this.entryFacade = entryFacade; |
---|
947 | } |
---|
948 | |
---|
949 | /* (non-Javadoc) |
---|
950 | * @see java.util.Iterator#hasNext() |
---|
951 | */ |
---|
952 | @Override |
---|
953 | public boolean hasNext() { |
---|
954 | return iterator.hasNext(); |
---|
955 | } |
---|
956 | |
---|
957 | /* (non-Javadoc) |
---|
958 | * @see java.util.Iterator#next() |
---|
959 | */ |
---|
960 | @Override |
---|
961 | public TYPE next() { |
---|
962 | return entryFacade.getFacadedElement(iterator.next()); |
---|
963 | } |
---|
964 | |
---|
965 | /* (non-Javadoc) |
---|
966 | * @see java.util.Iterator#remove() |
---|
967 | */ |
---|
968 | @Override |
---|
969 | public void remove() { |
---|
970 | throw new UnsupportedOperationException("this iterator is read only"); |
---|
971 | } |
---|
972 | |
---|
973 | } |
---|
974 | |
---|
975 | /** |
---|
976 | * <p> |
---|
977 | * Used to facade task instance entries and to return only this part of an entry, that is |
---|
978 | * relevant. |
---|
979 | * </p> |
---|
980 | * |
---|
981 | * @author Patrick Harms |
---|
982 | */ |
---|
983 | private abstract class EntryFacade<T> { |
---|
984 | |
---|
985 | /** |
---|
986 | * <p> |
---|
987 | * Returns only the part of an entry that is relevant or required. |
---|
988 | * </p> |
---|
989 | * |
---|
990 | * @param entry of which the part shall be returned |
---|
991 | * |
---|
992 | * @return the part of the entry to be returned |
---|
993 | */ |
---|
994 | protected abstract T getFacadedElement(Entry<ITask, V> entry); |
---|
995 | |
---|
996 | } |
---|
997 | |
---|
998 | /** |
---|
999 | * <p> |
---|
1000 | * Implementation of the entry facade returning the entries key, i.e. the symbol. |
---|
1001 | * </p> |
---|
1002 | * |
---|
1003 | * @author Patrick Harms |
---|
1004 | */ |
---|
1005 | private class SymbolFacade extends EntryFacade<ITask> { |
---|
1006 | |
---|
1007 | /* (non-Javadoc) |
---|
1008 | * @see ReadOnlyCollectionIteratorFacade#getFacadedElement(Entry) |
---|
1009 | */ |
---|
1010 | @Override |
---|
1011 | protected ITask getFacadedElement(Entry<ITask, V> entry) { |
---|
1012 | return entry.getKey(); |
---|
1013 | } |
---|
1014 | } |
---|
1015 | |
---|
1016 | /** |
---|
1017 | * <p> |
---|
1018 | * Implementation of the entry facade returning the entries value, i.e. the value associated to |
---|
1019 | * the symbol. |
---|
1020 | * </p> |
---|
1021 | * |
---|
1022 | * @author Patrick Harms |
---|
1023 | */ |
---|
1024 | private class ValueFacade extends EntryFacade<V> { |
---|
1025 | |
---|
1026 | /* (non-Javadoc) |
---|
1027 | * @see ReadOnlyCollectionIteratorFacade#getFacadedElement(Entry) |
---|
1028 | */ |
---|
1029 | @Override |
---|
1030 | protected V getFacadedElement(Entry<ITask, V> entry) { |
---|
1031 | return entry.getValue(); |
---|
1032 | } |
---|
1033 | } |
---|
1034 | |
---|
1035 | } |
---|