[1285] | 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.IEventType; |
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[1294] | 29 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTaskInstance; |
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| 30 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IIterationInstance; |
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| 31 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISelectionInstance; |
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| 32 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequenceInstance; |
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[1285] | 33 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
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| 34 | import de.ugoe.cs.autoquest.usageprofiles.SymbolMap; |
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| 35 | |
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| 36 | /** |
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| 37 | * TODO correct comment |
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| 38 | * <p> |
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| 39 | * This class is a data structure for holding symbols which is more efficient than a simple list. |
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| 40 | * This data structure can be used with a comparator to adapt the effective list behavior and to |
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| 41 | * define the equals strategy for comparing objects. After a certain size ({@link #MAX_LIST_SIZE}), |
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| 42 | * the symbol map creates a symbol index consisting of buckets. This allows searching for symbols |
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| 43 | * in a more efficient order as the search can start in the most appropriate of the internal |
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| 44 | * buckets. |
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| 45 | * </p> |
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| 46 | * <p> |
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| 47 | * The class is called a map, although it is not. It may contain the same element as separate keys. |
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| 48 | * This implementation is done for performance improvements. If it is required to really assure, |
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| 49 | * that a key exists only once, then each call to the {@link #addSymbol(Object, Object)} method |
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| 50 | * should be done only, if the {@link #containsSymbol(Object)} method for the same symbol returns |
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| 51 | * false. |
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| 52 | * </p> |
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| 53 | * |
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| 54 | * @see SymbolComparator |
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| 55 | * |
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| 56 | * @author Patrick Harms |
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| 57 | * @param <V> |
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| 58 | */ |
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| 59 | class TaskSymbolBucketedMap<V> implements SymbolMap<ITaskInstance, V>, Serializable { |
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| 60 | |
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| 61 | /** |
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| 62 | * <p> |
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| 63 | * default serial version UID |
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| 64 | * </p> |
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| 65 | */ |
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| 66 | private static final long serialVersionUID = 1L; |
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| 67 | |
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| 68 | /** |
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| 69 | * <p> |
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| 70 | * the maximum number of symbols in this map which is still only treated as list instead of |
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| 71 | * using buckets. |
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| 72 | * </p> |
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| 73 | */ |
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| 74 | private static final int MAX_LIST_SIZE = 15; |
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| 75 | |
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| 76 | /** |
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| 77 | * <p> |
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| 78 | * Comparator to be used for comparing the symbols with each other and to determine a bucket |
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| 79 | * search order |
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| 80 | * </p> |
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| 81 | */ |
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[1294] | 82 | private TaskInstanceComparator comparator; |
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[1285] | 83 | |
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| 84 | /** |
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| 85 | * <p> |
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| 86 | * Internally maintained plain list of symbols and associated values |
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| 87 | * </p> |
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| 88 | */ |
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| 89 | private List<Map.Entry<ITaskInstance, V>> symbolList; |
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| 90 | |
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| 91 | /** |
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| 92 | * <p> |
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| 93 | * If the size of the map exceeds {@link #MAX_LIST_SIZE}, this is the symbol index using buckets |
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| 94 | * for optimizing the search order. |
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| 95 | * </p> |
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| 96 | */ |
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| 97 | private Map<Integer, List<Map.Entry<ITaskInstance, V>>> symbolBuckets; |
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| 98 | |
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| 99 | /** |
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| 100 | * <p> |
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| 101 | * When using buckets, not any symbol may be associated a correct bucket by the used |
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| 102 | * comparator. Therefore, we set a default bucket for all such symbols. This may change |
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| 103 | * if the comparator defines the same bucket for a specific symbol. |
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| 104 | * </p> |
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| 105 | */ |
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| 106 | private int defaultBucket = 0; |
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| 107 | |
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| 108 | /** |
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| 109 | * <p> |
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| 110 | * Instantiates a symbol map with a comparator |
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| 111 | * </p> |
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| 112 | * |
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| 113 | * @param comparator the comparator to use for comparing symbols and for determining bucket |
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| 114 | * search orders |
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| 115 | * |
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| 116 | * @throws IllegalArgumentException if the provided comparator is null |
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| 117 | */ |
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[1294] | 118 | public TaskSymbolBucketedMap(TaskInstanceComparator comparator) { |
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[1285] | 119 | if (comparator == null) { |
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| 120 | throw new IllegalArgumentException("comparator must not be null"); |
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| 121 | } |
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| 122 | |
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| 123 | this.comparator = comparator; |
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| 124 | this.symbolList = new ArrayList<Map.Entry<ITaskInstance, V>>(); |
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| 125 | } |
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| 126 | |
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| 127 | /** |
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| 128 | * <p> |
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| 129 | * Copy constructure |
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| 130 | * </p> |
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| 131 | * |
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| 132 | * @param otherMap the other map to be copied including its comparator |
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| 133 | * |
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| 134 | * @throws IllegalArgumentException if the provided other map is null |
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| 135 | */ |
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| 136 | public TaskSymbolBucketedMap(TaskSymbolBucketedMap<V> otherMap) { |
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| 137 | if (otherMap == null) { |
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| 138 | throw new IllegalArgumentException("otherMap must not be null"); |
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| 139 | } |
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| 140 | |
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| 141 | this.comparator = otherMap.comparator; |
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| 142 | this.symbolList = new ArrayList<Map.Entry<ITaskInstance, V>>(otherMap.symbolList); |
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| 143 | |
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| 144 | if (this.symbolList.size() > MAX_LIST_SIZE) { |
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| 145 | createSymbolBuckets(); |
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| 146 | } |
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| 147 | } |
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| 148 | |
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| 149 | /** |
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| 150 | * <p> |
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| 151 | * Returns the size of the map, i.e. the number of symbol entries |
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| 152 | * </p> |
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| 153 | * |
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| 154 | * @return as described |
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| 155 | */ |
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| 156 | public int size() { |
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| 157 | return symbolList.size(); |
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| 158 | } |
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| 159 | |
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| 160 | /** |
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| 161 | * <p> |
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| 162 | * Returns true if this map is empty, i.e. if {@link #size()} returns 0 |
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| 163 | * </p> |
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| 164 | * |
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| 165 | * @return as described |
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| 166 | */ |
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| 167 | public boolean isEmpty() { |
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| 168 | return symbolList.isEmpty(); |
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| 169 | } |
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| 170 | |
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| 171 | /** |
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| 172 | * <p> |
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| 173 | * Returns true if the provided symbol was stored in this map. |
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| 174 | * </p> |
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| 175 | * |
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| 176 | * @param symbol the symbol to check if it was stored in this map |
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| 177 | * |
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| 178 | * @return as described |
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| 179 | * |
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| 180 | * @throws IllegalArgumentException if the provided symbol is null |
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| 181 | */ |
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| 182 | public boolean containsSymbol(ITaskInstance symbol) { |
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| 183 | if (symbol == null) { |
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| 184 | throw new IllegalArgumentException("symbol must not be null"); |
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| 185 | } |
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| 186 | |
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| 187 | return getEntry(symbol) != null; |
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| 188 | } |
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| 189 | |
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| 190 | /** |
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| 191 | * <p> |
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| 192 | * Returns the value associated to the provided symbol in this map. If there is no value |
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| 193 | * associated to the given symbol or if the symbol is not stored in this map, the method |
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| 194 | * returns null. |
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| 195 | * </p> |
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| 196 | * |
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| 197 | * @param symbol the symbol to return the value for |
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| 198 | * |
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| 199 | * @return as described |
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| 200 | * |
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| 201 | * @throws IllegalArgumentException if the provided symbol is null |
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| 202 | */ |
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| 203 | public V getValue(ITaskInstance symbol) { |
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| 204 | if (symbol == null) { |
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| 205 | throw new IllegalArgumentException("symbol must not be null"); |
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| 206 | } |
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| 207 | |
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| 208 | Map.Entry<ITaskInstance, V> entry = getEntry(symbol); |
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| 209 | |
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| 210 | if (entry != null) { |
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| 211 | return entry.getValue(); |
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| 212 | } |
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| 213 | else { |
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| 214 | return null; |
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| 215 | } |
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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 | * Adds a symbol and an associated value to the map. If the value is null, the symbol is added, |
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| 221 | * anyway and {@link #containsSymbol(Object)} will return true for that symbol. Adding the |
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| 222 | * same symbol twice will produce two entries. This is contradictory to typical map |
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| 223 | * implementations. To prevent this, the {@link #containsSymbol(Object)} and |
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| 224 | * {@link #removeSymbol(Object)} methods should be used to ensure map behavior. |
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| 225 | * </p> |
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| 226 | * |
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| 227 | * @param symbol the symbol to add to the map |
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| 228 | * @param value the value to associate to the symbol in this map |
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| 229 | * |
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| 230 | * @return as described |
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| 231 | * |
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| 232 | * @throws IllegalArgumentException if the provided symbol is null |
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| 233 | */ |
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| 234 | public void addSymbol(ITaskInstance symbol, V value) { |
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| 235 | if (symbol == null) { |
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| 236 | throw new IllegalArgumentException("symbol must not be null"); |
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| 237 | } |
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| 238 | |
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| 239 | Map.Entry<ITaskInstance, V> entry = new SymbolMapEntry(symbol, value); |
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| 240 | |
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| 241 | symbolList.add(entry); |
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| 242 | |
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| 243 | if (symbolList.size() > MAX_LIST_SIZE) { |
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| 244 | if (symbolBuckets == null) { |
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| 245 | createSymbolBuckets(); |
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| 246 | } |
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| 247 | else { |
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| 248 | addToSymbolBucket(entry); |
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| 249 | } |
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| 250 | } |
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| 251 | } |
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| 252 | |
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| 253 | /** |
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| 254 | * <p> |
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| 255 | * Removes a symbol and its associated value from the map. If the symbol is stored several |
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| 256 | * times, the first of its occurrences is removed. |
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| 257 | * </p> |
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| 258 | * |
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| 259 | * @param symbol the symbol to be removed from the map |
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| 260 | * |
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| 261 | * @return as described |
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| 262 | * |
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| 263 | * @throws IllegalArgumentException if the provided symbol is null |
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| 264 | */ |
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| 265 | public V removeSymbol(ITaskInstance symbol) { |
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| 266 | if (symbol == null) { |
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| 267 | throw new IllegalArgumentException("symbol must not be null"); |
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| 268 | } |
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| 269 | |
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| 270 | for (int i = 0; i < symbolList.size(); i++) { |
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| 271 | if (comparator.equals(symbolList.get(i).getKey(), symbol)) { |
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| 272 | // found the symbol. Remove it from the list, and if required, also from the map. |
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| 273 | V value = symbolList.remove(i).getValue(); |
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| 274 | |
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| 275 | if (symbolList.size() > MAX_LIST_SIZE) { |
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| 276 | removeFromSymbolBuckets(symbol); |
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| 277 | } |
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| 278 | |
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| 279 | return value; |
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| 280 | } |
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| 281 | } |
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| 282 | |
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| 283 | return null; |
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| 284 | } |
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| 285 | |
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| 286 | /** |
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| 287 | * <p> |
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| 288 | * Returns a collection of all symbols in this map. |
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| 289 | * </p> |
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| 290 | * |
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| 291 | * @return as described |
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| 292 | */ |
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| 293 | public Collection<ITaskInstance> getSymbols() { |
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| 294 | return new ReadOnlyCollectionFacade<ITaskInstance>(symbolList, new SymbolFacade()); |
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| 295 | } |
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| 296 | |
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| 297 | /** |
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| 298 | * <p> |
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| 299 | * Returns a collection of all values associated to symbols in this map. May contain null |
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| 300 | * values, if some of the symbols are mapped to null. The length of the returned collection |
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| 301 | * is in any case the same as the size of the map. |
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| 302 | * </p> |
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| 303 | * |
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| 304 | * @return as described |
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| 305 | */ |
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| 306 | public Collection<V> getValues() { |
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| 307 | return new ReadOnlyCollectionFacade<V>(symbolList, new ValueFacade()); |
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| 308 | } |
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| 309 | |
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| 310 | /** |
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| 311 | * <p> |
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| 312 | * Removes all symbols and associated values from the map. |
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| 313 | * </p> |
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| 314 | */ |
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| 315 | public void clear() { |
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| 316 | symbolList.clear(); |
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| 317 | symbolBuckets = null; |
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| 318 | } |
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| 319 | |
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| 320 | /* (non-Javadoc) |
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| 321 | * @see java.lang.Object#hashCode() |
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| 322 | */ |
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| 323 | @Override |
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| 324 | public int hashCode() { |
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| 325 | return symbolList.size(); |
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| 326 | } |
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| 327 | |
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| 328 | /* (non-Javadoc) |
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| 329 | * @see java.lang.Object#equals(java.lang.Object) |
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| 330 | */ |
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| 331 | @SuppressWarnings("unchecked") |
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| 332 | @Override |
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| 333 | public boolean equals(Object obj) { |
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| 334 | if (this == obj) { |
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| 335 | return true; |
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| 336 | } |
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| 337 | else if (this.getClass().isInstance(obj)) { |
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| 338 | TaskSymbolBucketedMap<V> other = (TaskSymbolBucketedMap<V>) obj; |
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| 339 | |
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| 340 | return (symbolList.size() == other.symbolList.size()) && |
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| 341 | (symbolList.containsAll(other.symbolList)); |
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| 342 | } |
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| 343 | else { |
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| 344 | return false; |
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| 345 | } |
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| 346 | } |
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| 347 | |
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| 348 | /** |
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| 349 | * <p> |
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| 350 | * Internally used to create symbol buckets in case the number of stored symbols increased |
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| 351 | * above {@link #MAX_LIST_SIZE}. |
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| 352 | * </p> |
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| 353 | */ |
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| 354 | private void createSymbolBuckets() { |
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| 355 | //System.out.println("creating symbol buckets"); |
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| 356 | symbolBuckets = new HashMap<Integer, List<Map.Entry<ITaskInstance, V>>>(); |
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| 357 | |
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| 358 | for (Map.Entry<ITaskInstance, V> symbol : symbolList) { |
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| 359 | addToSymbolBucket(symbol); |
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| 360 | } |
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| 361 | } |
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| 362 | |
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| 363 | /** |
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| 364 | * <p> |
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| 365 | * Adds a symbol and its value to its corresponding bucket. The corresponding bucket is |
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| 366 | * retrieved from the symbol comparator. It is the first element of the search order returned |
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| 367 | * by the symbol comparator. If the comparator does not define a search order for the symbol |
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| 368 | * the entry is added to the default bucket. If the comparator defines a bucket id |
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| 369 | * identical to the default bucket id, the default bucket id is shifted to another value. |
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| 370 | * </p> |
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| 371 | */ |
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| 372 | private void addToSymbolBucket(Map.Entry<ITaskInstance, V> symbolEntry) { |
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| 373 | int bucketId = defaultBucket; |
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| 374 | int[] bucketSearchOrder = getBucketSearchOrder(symbolEntry.getKey()); |
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| 375 | |
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| 376 | if ((bucketSearchOrder != null) && (bucketSearchOrder.length > 0)) { |
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| 377 | bucketId = bucketSearchOrder[0]; |
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| 378 | |
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| 379 | if (bucketId == defaultBucket) { |
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| 380 | setNewDefaultBucketId(); |
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| 381 | } |
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| 382 | } |
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| 383 | |
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| 384 | List<Map.Entry<ITaskInstance, V>> list = symbolBuckets.get(bucketId); |
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| 385 | |
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| 386 | if (list == null) { |
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| 387 | list = new LinkedList<Map.Entry<ITaskInstance, V>>(); |
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| 388 | symbolBuckets.put(bucketId, list); |
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| 389 | } |
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| 390 | |
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| 391 | list.add(symbolEntry); |
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| 392 | } |
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| 393 | |
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| 394 | /** |
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| 395 | * |
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| 396 | */ |
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| 397 | public int[] getBucketSearchOrder(ITaskInstance taskInstance) { |
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| 398 | // 0 = sequence; 1 = selection; 2 = iteration; 3 = optional; 4 = event task in general; |
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| 399 | // other = hashCode of name of event type |
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| 400 | |
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[1294] | 401 | if (taskInstance instanceof IEventTaskInstance) { |
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[1285] | 402 | // event tasks are most likely equal to those of the event type with the same name, |
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| 403 | // Afterwards, they may be equal to iterations, optionals, other event tasks, |
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| 404 | // selections, and finally the rest. |
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[1294] | 405 | IEventType eventType = ((IEventTaskInstance) taskInstance).getEvent().getType(); |
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[1285] | 406 | return new int[] { eventType.getName().hashCode(), 2, 3, 4, 1 }; |
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| 407 | } |
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[1294] | 408 | else if (taskInstance instanceof ISequenceInstance) { |
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[1285] | 409 | return new int[] { 0, 2, 3, 1 }; |
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| 410 | } |
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[1294] | 411 | else if (taskInstance instanceof ISelectionInstance) { |
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[1285] | 412 | return new int[] { 1, 4, 2, 3 }; |
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| 413 | } |
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[1294] | 414 | else if (taskInstance instanceof IIterationInstance) { |
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[1285] | 415 | return new int[] { 2, 1, 4 }; |
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| 416 | } |
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| 417 | |
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| 418 | return null; |
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| 419 | } |
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| 420 | |
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| 421 | /** |
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| 422 | * <p> |
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| 423 | * Removes the entry for a given symbol from the buckets. It uses the bucket search order |
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| 424 | * defined by the symbol comparator to find the symbol as fast as possible. |
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| 425 | * </p> |
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| 426 | */ |
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| 427 | private Map.Entry<ITaskInstance, V> removeFromSymbolBuckets(ITaskInstance symbol) { |
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| 428 | int bucketId = defaultBucket; |
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| 429 | int[] bucketSearchOrder = getBucketSearchOrder(symbol); |
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| 430 | |
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| 431 | if ((bucketSearchOrder != null) && (bucketSearchOrder.length > 0)) { |
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| 432 | bucketId = bucketSearchOrder[0]; |
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| 433 | } |
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| 434 | |
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| 435 | List<Map.Entry<ITaskInstance, V>> list = symbolBuckets.get(bucketId); |
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| 436 | Map.Entry<ITaskInstance, V> result = null; |
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| 437 | |
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| 438 | if (list != null) { |
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| 439 | for (int i = 0; i < list.size(); i++) { |
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| 440 | if (comparator.equals(list.get(i).getKey(), symbol)) { |
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| 441 | result = list.remove(i); |
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| 442 | break; |
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| 443 | } |
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| 444 | } |
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| 445 | |
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| 446 | if (list.isEmpty()) { |
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| 447 | symbolBuckets.remove(bucketId); |
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| 448 | } |
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| 449 | } |
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| 450 | |
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| 451 | return result; |
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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 | * Updates the default bucket id to a new one |
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| 457 | * </p> |
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| 458 | */ |
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| 459 | private void setNewDefaultBucketId() { |
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| 460 | int oldDefaultBucket = defaultBucket; |
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| 461 | do { |
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| 462 | defaultBucket += 1; |
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| 463 | } |
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| 464 | while (symbolBuckets.containsKey(defaultBucket)); |
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| 465 | |
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| 466 | symbolBuckets.put(defaultBucket, symbolBuckets.get(oldDefaultBucket)); |
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| 467 | } |
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| 468 | |
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| 469 | /** |
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| 470 | * <p> |
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| 471 | * searches for the entry belonging to the given symbol. The method either uses the list if |
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| 472 | * buckets are not used yet, or it uses the buckets and searches them in the order defined |
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| 473 | * by the comparator. If the symbol isn't found and the comparator does not refer all buckets, |
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| 474 | * then also the other buckets are searched for the symbol. |
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| 475 | * </p> |
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| 476 | */ |
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| 477 | private Map.Entry<ITaskInstance, V> getEntry(ITaskInstance symbol) { |
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| 478 | Map.Entry<ITaskInstance, V> entry = null; |
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| 479 | if (symbolBuckets == null) { |
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| 480 | entry = lookup(symbol, symbolList); |
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| 481 | } |
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| 482 | else { |
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| 483 | int[] bucketSearchOrder = getBucketSearchOrder(symbol); |
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| 484 | for (int bucketId : bucketSearchOrder) { |
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| 485 | List<Map.Entry<ITaskInstance, V>> list = symbolBuckets.get(bucketId); |
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| 486 | if (list != null) { |
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| 487 | entry = lookup(symbol, list); |
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| 488 | if (entry != null) { |
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| 489 | break; |
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| 490 | } |
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| 491 | } |
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| 492 | } |
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| 493 | |
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| 494 | // try to search the other buckets |
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| 495 | if (entry == null) { |
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| 496 | Arrays.sort(bucketSearchOrder); |
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| 497 | for (Map.Entry<Integer, List<Map.Entry<ITaskInstance, V>>> bucket : symbolBuckets.entrySet()) { |
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| 498 | if (Arrays.binarySearch(bucketSearchOrder, bucket.getKey()) < 0) { |
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| 499 | List<Map.Entry<ITaskInstance, V>> list = bucket.getValue(); |
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| 500 | if (list != null) { |
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| 501 | entry = lookup(symbol, list); |
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| 502 | if (entry != null) { |
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| 503 | break; |
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| 504 | } |
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| 505 | } |
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| 506 | } |
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| 507 | } |
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| 508 | } |
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| 509 | } |
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| 510 | |
---|
| 511 | return entry; |
---|
| 512 | } |
---|
| 513 | |
---|
| 514 | /** |
---|
| 515 | * <p> |
---|
| 516 | * Convenience method to look up a symbol in a list of entries using the comparator. |
---|
| 517 | * </p> |
---|
| 518 | */ |
---|
| 519 | private Map.Entry<ITaskInstance, V> lookup(ITaskInstance symbol, List<Map.Entry<ITaskInstance, V>> list) { |
---|
| 520 | for (Map.Entry<ITaskInstance, V> candidate : list) { |
---|
| 521 | if (comparator.equals(candidate.getKey(), symbol)) { |
---|
| 522 | return candidate; |
---|
| 523 | } |
---|
| 524 | } |
---|
| 525 | |
---|
| 526 | return null; |
---|
| 527 | } |
---|
| 528 | |
---|
| 529 | /** |
---|
| 530 | * <p> |
---|
| 531 | * Internally used data structure for storing symbol value pairs |
---|
| 532 | * </p> |
---|
| 533 | * |
---|
| 534 | * @author Patrick Harms |
---|
| 535 | */ |
---|
| 536 | private class SymbolMapEntry implements Map.Entry<ITaskInstance, V> { |
---|
| 537 | |
---|
| 538 | /** |
---|
| 539 | * the symbol to map to a value |
---|
| 540 | */ |
---|
| 541 | private ITaskInstance symbol; |
---|
| 542 | |
---|
| 543 | /** |
---|
| 544 | * the value associated with the symbol |
---|
| 545 | */ |
---|
| 546 | private V value; |
---|
| 547 | |
---|
| 548 | /** |
---|
| 549 | * <p> |
---|
| 550 | * Simple constructor for initializing the entry with a symbol and its associated value. |
---|
| 551 | * </p> |
---|
| 552 | */ |
---|
| 553 | private SymbolMapEntry(ITaskInstance symbol, V value) { |
---|
| 554 | super(); |
---|
| 555 | this.symbol = symbol; |
---|
| 556 | this.value = value; |
---|
| 557 | } |
---|
| 558 | |
---|
| 559 | /* (non-Javadoc) |
---|
| 560 | * @see java.util.Map.Entry#getKey() |
---|
| 561 | */ |
---|
| 562 | @Override |
---|
| 563 | public ITaskInstance getKey() { |
---|
| 564 | return symbol; |
---|
| 565 | } |
---|
| 566 | |
---|
| 567 | /* (non-Javadoc) |
---|
| 568 | * @see java.util.Map.Entry#getValue() |
---|
| 569 | */ |
---|
| 570 | @Override |
---|
| 571 | public V getValue() { |
---|
| 572 | return value; |
---|
| 573 | } |
---|
| 574 | |
---|
| 575 | /* (non-Javadoc) |
---|
| 576 | * @see java.util.Map.Entry#setValue(java.lang.Object) |
---|
| 577 | */ |
---|
| 578 | @Override |
---|
| 579 | public V setValue(V value) { |
---|
| 580 | V oldValue = this.value; |
---|
| 581 | this.value = value; |
---|
| 582 | return oldValue; |
---|
| 583 | } |
---|
| 584 | |
---|
| 585 | /* (non-Javadoc) |
---|
| 586 | * @see java.lang.Object#hashCode() |
---|
| 587 | */ |
---|
| 588 | @Override |
---|
| 589 | public int hashCode() { |
---|
| 590 | return symbol.hashCode(); |
---|
| 591 | } |
---|
| 592 | |
---|
| 593 | /* (non-Javadoc) |
---|
| 594 | * @see java.lang.Object#equals(java.lang.Object) |
---|
| 595 | */ |
---|
| 596 | @SuppressWarnings("unchecked") |
---|
| 597 | @Override |
---|
| 598 | public boolean equals(Object obj) { |
---|
| 599 | if (this == obj) { |
---|
| 600 | return true; |
---|
| 601 | } |
---|
| 602 | else if (this.getClass().isInstance(obj)) { |
---|
| 603 | SymbolMapEntry other = (SymbolMapEntry) obj; |
---|
| 604 | return (symbol.equals(other.symbol) && |
---|
| 605 | (value == null ? other.value == null : value.equals(other.value))); |
---|
| 606 | } |
---|
| 607 | else { |
---|
| 608 | return false; |
---|
| 609 | } |
---|
| 610 | } |
---|
| 611 | |
---|
| 612 | /* (non-Javadoc) |
---|
| 613 | * @see java.lang.Object#toString() |
---|
| 614 | */ |
---|
| 615 | @Override |
---|
| 616 | public String toString() { |
---|
| 617 | return symbol + "=" + value; |
---|
| 618 | } |
---|
| 619 | |
---|
| 620 | } |
---|
| 621 | |
---|
| 622 | /** |
---|
| 623 | * <p> |
---|
| 624 | * Used to create an efficient facade for accessing the internal list of entries either only |
---|
| 625 | * for the symbols or only for the values. It is a default implementation of the collection |
---|
| 626 | * interface. The entry facade provided to the constructor decides, if either the list |
---|
| 627 | * accesses only the symbols or only the values. |
---|
| 628 | * </p> |
---|
| 629 | * |
---|
| 630 | * @author Patrick Harms |
---|
| 631 | */ |
---|
| 632 | private class ReadOnlyCollectionFacade<TYPE> implements Collection<TYPE> { |
---|
| 633 | |
---|
| 634 | /** |
---|
| 635 | * the list facaded by this facade |
---|
| 636 | */ |
---|
| 637 | private List<Map.Entry<ITaskInstance, V>> list; |
---|
| 638 | |
---|
| 639 | /** |
---|
| 640 | * the facade to be used for the entries |
---|
| 641 | */ |
---|
| 642 | private EntryFacade<TYPE> entryFacade; |
---|
| 643 | |
---|
| 644 | /** |
---|
| 645 | * <p> |
---|
| 646 | * Initializes the facade with the facaded list and the facade to be used for the entries |
---|
| 647 | * </p> |
---|
| 648 | */ |
---|
| 649 | private ReadOnlyCollectionFacade(List<Map.Entry<ITaskInstance, V>> list, EntryFacade<TYPE> entryFacade) |
---|
| 650 | { |
---|
| 651 | this.list = list; |
---|
| 652 | this.entryFacade = entryFacade; |
---|
| 653 | } |
---|
| 654 | |
---|
| 655 | /* (non-Javadoc) |
---|
| 656 | * @see java.util.Collection#size() |
---|
| 657 | */ |
---|
| 658 | @Override |
---|
| 659 | public int size() { |
---|
| 660 | return list.size(); |
---|
| 661 | } |
---|
| 662 | |
---|
| 663 | /* (non-Javadoc) |
---|
| 664 | * @see java.util.Collection#isEmpty() |
---|
| 665 | */ |
---|
| 666 | @Override |
---|
| 667 | public boolean isEmpty() { |
---|
| 668 | return list.isEmpty(); |
---|
| 669 | } |
---|
| 670 | |
---|
| 671 | /* (non-Javadoc) |
---|
| 672 | * @see java.util.Collection#contains(java.lang.Object) |
---|
| 673 | */ |
---|
| 674 | @Override |
---|
| 675 | public boolean contains(Object o) { |
---|
| 676 | if (o == null) { |
---|
| 677 | for (Map.Entry<ITaskInstance, V> entry : list) { |
---|
| 678 | if (entryFacade.getFacadedElement(entry) == null) { |
---|
| 679 | return true; |
---|
| 680 | } |
---|
| 681 | } |
---|
| 682 | } |
---|
| 683 | else { |
---|
| 684 | for (Map.Entry<ITaskInstance, V> entry : list) { |
---|
| 685 | if (o.equals(entryFacade.getFacadedElement(entry))) { |
---|
| 686 | return true; |
---|
| 687 | } |
---|
| 688 | } |
---|
| 689 | } |
---|
| 690 | |
---|
| 691 | return false; |
---|
| 692 | } |
---|
| 693 | |
---|
| 694 | /* (non-Javadoc) |
---|
| 695 | * @see java.util.Collection#toArray() |
---|
| 696 | */ |
---|
| 697 | @Override |
---|
| 698 | public Object[] toArray() { |
---|
| 699 | Object[] result = new Object[list.size()]; |
---|
| 700 | |
---|
| 701 | for (int i = 0; i < list.size(); i++) { |
---|
| 702 | result[i] = entryFacade.getFacadedElement(list.get(i)); |
---|
| 703 | } |
---|
| 704 | |
---|
| 705 | return result; |
---|
| 706 | } |
---|
| 707 | |
---|
| 708 | /* (non-Javadoc) |
---|
| 709 | * @see java.util.Collection#toArray(T[]) |
---|
| 710 | */ |
---|
| 711 | @SuppressWarnings("unchecked") |
---|
| 712 | @Override |
---|
| 713 | public <T> T[] toArray(T[] a) { |
---|
| 714 | T[] result = a; |
---|
| 715 | |
---|
| 716 | for (int i = 0; i < list.size(); i++) { |
---|
| 717 | result[i] = (T) entryFacade.getFacadedElement(list.get(i)); |
---|
| 718 | } |
---|
| 719 | |
---|
| 720 | return result; |
---|
| 721 | } |
---|
| 722 | |
---|
| 723 | /* (non-Javadoc) |
---|
| 724 | * @see java.util.Collection#add(java.lang.Object) |
---|
| 725 | */ |
---|
| 726 | @Override |
---|
| 727 | public boolean add(TYPE e) { |
---|
| 728 | throw new UnsupportedOperationException("this collection is read only"); |
---|
| 729 | } |
---|
| 730 | |
---|
| 731 | /* (non-Javadoc) |
---|
| 732 | * @see java.util.Collection#remove(java.lang.Object) |
---|
| 733 | */ |
---|
| 734 | @Override |
---|
| 735 | public boolean remove(Object o) { |
---|
| 736 | throw new UnsupportedOperationException("this collection is read only"); |
---|
| 737 | } |
---|
| 738 | |
---|
| 739 | /* (non-Javadoc) |
---|
| 740 | * @see java.util.Collection#containsAll(java.util.Collection) |
---|
| 741 | */ |
---|
| 742 | @Override |
---|
| 743 | public boolean containsAll(Collection<?> c) { |
---|
| 744 | for (Object candidate : c) { |
---|
| 745 | if (!contains(candidate)) { |
---|
| 746 | return false; |
---|
| 747 | } |
---|
| 748 | } |
---|
| 749 | |
---|
| 750 | return true; |
---|
| 751 | } |
---|
| 752 | |
---|
| 753 | /* (non-Javadoc) |
---|
| 754 | * @see java.util.Collection#addAll(java.util.Collection) |
---|
| 755 | */ |
---|
| 756 | @Override |
---|
| 757 | public boolean addAll(Collection<? extends TYPE> c) { |
---|
| 758 | throw new UnsupportedOperationException("this collection is read only"); |
---|
| 759 | } |
---|
| 760 | |
---|
| 761 | /* (non-Javadoc) |
---|
| 762 | * @see java.util.Collection#removeAll(java.util.Collection) |
---|
| 763 | */ |
---|
| 764 | @Override |
---|
| 765 | public boolean removeAll(Collection<?> c) { |
---|
| 766 | throw new UnsupportedOperationException("this collection is read only"); |
---|
| 767 | } |
---|
| 768 | |
---|
| 769 | /* (non-Javadoc) |
---|
| 770 | * @see java.util.Collection#retainAll(java.util.Collection) |
---|
| 771 | */ |
---|
| 772 | @Override |
---|
| 773 | public boolean retainAll(Collection<?> c) { |
---|
| 774 | throw new UnsupportedOperationException("this collection is read only"); |
---|
| 775 | } |
---|
| 776 | |
---|
| 777 | /* (non-Javadoc) |
---|
| 778 | * @see java.util.Collection#clear() |
---|
| 779 | */ |
---|
| 780 | @Override |
---|
| 781 | public void clear() { |
---|
| 782 | throw new UnsupportedOperationException("this collection is read only"); |
---|
| 783 | } |
---|
| 784 | |
---|
| 785 | /* (non-Javadoc) |
---|
| 786 | * @see java.util.Collection#iterator() |
---|
| 787 | */ |
---|
| 788 | @Override |
---|
| 789 | public Iterator<TYPE> iterator() { |
---|
| 790 | return new ReadOnlyCollectionIteratorFacade<TYPE>(list.iterator(), entryFacade); |
---|
| 791 | } |
---|
| 792 | |
---|
| 793 | } |
---|
| 794 | |
---|
| 795 | /** |
---|
| 796 | * <p> |
---|
| 797 | * Implementation of an iterator to facade an iterator on the internal list of symbol entries. |
---|
| 798 | * </p> |
---|
| 799 | * |
---|
| 800 | * @author Patrick Harms |
---|
| 801 | */ |
---|
| 802 | private class ReadOnlyCollectionIteratorFacade<TYPE> implements Iterator<TYPE> { |
---|
| 803 | |
---|
| 804 | /** |
---|
| 805 | * the facaded iterator |
---|
| 806 | */ |
---|
| 807 | private Iterator<Map.Entry<ITaskInstance, V>> iterator; |
---|
| 808 | |
---|
| 809 | /** |
---|
| 810 | * the facade for the entries provided by the facaded iterator |
---|
| 811 | */ |
---|
| 812 | private EntryFacade<TYPE> entryFacade; |
---|
| 813 | |
---|
| 814 | /** |
---|
| 815 | * <p> |
---|
| 816 | * initialized this facade with the facaded iterator and the entry facade to be used for |
---|
| 817 | * the entries. |
---|
| 818 | * </p> |
---|
| 819 | */ |
---|
| 820 | private ReadOnlyCollectionIteratorFacade(Iterator<Map.Entry<ITaskInstance, V>> iterator, |
---|
| 821 | EntryFacade<TYPE> entryFacade) |
---|
| 822 | { |
---|
| 823 | this.iterator = iterator; |
---|
| 824 | this.entryFacade = entryFacade; |
---|
| 825 | } |
---|
| 826 | |
---|
| 827 | /* (non-Javadoc) |
---|
| 828 | * @see java.util.Iterator#hasNext() |
---|
| 829 | */ |
---|
| 830 | @Override |
---|
| 831 | public boolean hasNext() { |
---|
| 832 | return iterator.hasNext(); |
---|
| 833 | } |
---|
| 834 | |
---|
| 835 | /* (non-Javadoc) |
---|
| 836 | * @see java.util.Iterator#next() |
---|
| 837 | */ |
---|
| 838 | @Override |
---|
| 839 | public TYPE next() { |
---|
| 840 | return entryFacade.getFacadedElement(iterator.next()); |
---|
| 841 | } |
---|
| 842 | |
---|
| 843 | /* (non-Javadoc) |
---|
| 844 | * @see java.util.Iterator#remove() |
---|
| 845 | */ |
---|
| 846 | @Override |
---|
| 847 | public void remove() { |
---|
| 848 | throw new UnsupportedOperationException("this iterator is read only"); |
---|
| 849 | } |
---|
| 850 | |
---|
| 851 | } |
---|
| 852 | |
---|
| 853 | /** |
---|
| 854 | * <p> |
---|
| 855 | * Used to facade symbol entries and to return only this part of an entry, that is relevant. |
---|
| 856 | * </p> |
---|
| 857 | * |
---|
| 858 | * @author Patrick Harms |
---|
| 859 | */ |
---|
| 860 | private abstract class EntryFacade<T> { |
---|
| 861 | |
---|
| 862 | /** |
---|
| 863 | * <p> |
---|
| 864 | * Returns only the part of an entry that is relevant or required. |
---|
| 865 | * </p> |
---|
| 866 | * |
---|
| 867 | * @param entry of which the part shall be returned |
---|
| 868 | * |
---|
| 869 | * @return the part of the entry to be returned |
---|
| 870 | */ |
---|
| 871 | protected abstract T getFacadedElement(Entry<ITaskInstance, V> entry); |
---|
| 872 | |
---|
| 873 | } |
---|
| 874 | |
---|
| 875 | /** |
---|
| 876 | * <p> |
---|
| 877 | * Implementation of the entry facade returning the entries key, i.e. the symbol. |
---|
| 878 | * </p> |
---|
| 879 | * |
---|
| 880 | * @author Patrick Harms |
---|
| 881 | */ |
---|
| 882 | private class SymbolFacade extends EntryFacade<ITaskInstance> { |
---|
| 883 | |
---|
| 884 | /* (non-Javadoc) |
---|
| 885 | * @see ReadOnlyCollectionIteratorFacade#getFacadedElement(Entry) |
---|
| 886 | */ |
---|
| 887 | @Override |
---|
| 888 | protected ITaskInstance getFacadedElement(Entry<ITaskInstance, V> entry) { |
---|
| 889 | return entry.getKey(); |
---|
| 890 | } |
---|
| 891 | } |
---|
| 892 | |
---|
| 893 | /** |
---|
| 894 | * <p> |
---|
| 895 | * Implementation of the entry facade returning the entries value, i.e. the value associated to |
---|
| 896 | * the symbol. |
---|
| 897 | * </p> |
---|
| 898 | * |
---|
| 899 | * @author Patrick Harms |
---|
| 900 | */ |
---|
| 901 | private class ValueFacade extends EntryFacade<V> { |
---|
| 902 | |
---|
| 903 | /* (non-Javadoc) |
---|
| 904 | * @see ReadOnlyCollectionIteratorFacade#getFacadedElement(Entry) |
---|
| 905 | */ |
---|
| 906 | @Override |
---|
| 907 | protected V getFacadedElement(Entry<ITaskInstance, V> entry) { |
---|
| 908 | return entry.getValue(); |
---|
| 909 | } |
---|
| 910 | } |
---|
| 911 | |
---|
| 912 | } |
---|