[1256] | 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.util.HashMap; |
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| 18 | import java.util.LinkedList; |
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| 19 | import java.util.List; |
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| 20 | import java.util.Map; |
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| 21 | |
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| 22 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
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| 23 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IUserSession; |
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| 24 | import de.ugoe.cs.autoquest.usageprofiles.SymbolMap; |
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| 25 | import de.ugoe.cs.autoquest.usageprofiles.Trie; |
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| 26 | import de.ugoe.cs.autoquest.usageprofiles.TrieProcessor; |
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| 27 | |
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| 28 | /** |
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| 29 | * <p> |
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| 30 | * TODO comment |
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| 31 | * </p> |
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| 32 | * |
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| 33 | * @author Patrick Harms |
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| 34 | */ |
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| 35 | public class TaskInstanceTrie extends Trie<ITaskInstance> { |
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| 36 | |
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| 37 | /** */ |
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| 38 | private static final long serialVersionUID = 1L; |
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| 39 | |
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| 40 | /** |
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| 41 | * <p> |
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| 42 | * the task comparator to be used for comparing tasks |
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| 43 | * </p> |
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| 44 | */ |
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| 45 | private TaskComparator comparator; |
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| 46 | |
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| 47 | /** |
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| 48 | * <p> |
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| 49 | * TODO: comment |
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| 50 | * </p> |
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| 51 | * |
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| 52 | * @param taskComparator2 |
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| 53 | */ |
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| 54 | public TaskInstanceTrie(TaskComparator taskComparator) { |
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| 55 | super(taskComparator); |
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| 56 | this.comparator = taskComparator; |
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| 57 | } |
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| 58 | |
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| 59 | /** |
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| 60 | * |
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| 61 | */ |
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| 62 | public void trainSessions(List<IUserSession> userSessions, int maxOrder) { |
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| 63 | if (maxOrder < 1) { |
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| 64 | return; |
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| 65 | } |
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| 66 | |
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| 67 | SymbolMap<ITaskInstance, List<ITaskInstance>> equalTaskInstancesMap = |
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| 68 | new SymbolMap<ITaskInstance, List<ITaskInstance>>(comparator); |
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| 69 | |
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| 70 | Map<ITaskInstance, List<ITaskInstance>> taskInstancesMap = |
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| 71 | new HashMap<ITaskInstance, List<ITaskInstance>>(); |
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| 72 | |
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| 73 | System.out.println("preparing training"); |
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| 74 | for (IUserSession session : userSessions) { |
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| 75 | for (ITaskInstance taskInstance : session) { |
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| 76 | List<ITaskInstance> equalTaskInstances = |
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| 77 | equalTaskInstancesMap.getValue(taskInstance); |
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| 78 | |
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| 79 | if (equalTaskInstances == null) { |
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| 80 | equalTaskInstances = new LinkedList<ITaskInstance>(); |
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| 81 | equalTaskInstancesMap.addSymbol(taskInstance, equalTaskInstances); |
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| 82 | } |
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| 83 | |
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| 84 | equalTaskInstances.add(taskInstance); |
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| 85 | taskInstancesMap.put(taskInstance, equalTaskInstances); |
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| 86 | } |
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| 87 | } |
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| 88 | |
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| 89 | System.out.println("performing training"); |
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| 90 | for (IUserSession session : userSessions) { |
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| 91 | train(session, maxOrder, taskInstancesMap); |
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| 92 | } |
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| 93 | |
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| 94 | updateKnownSymbols(); |
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| 95 | } |
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| 96 | |
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| 97 | /** |
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| 98 | * |
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| 99 | */ |
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| 100 | private void train(IUserSession userSession, |
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| 101 | int maxOrder, |
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| 102 | Map<ITaskInstance, List<ITaskInstance>> taskInstancesMap) |
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| 103 | { |
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| 104 | List<ITaskInstance> executedTasks = userSession.getExecutedTasks(); |
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| 105 | |
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| 106 | List<ITaskInstance> subsequence = new LinkedList<ITaskInstance>(); |
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| 107 | |
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| 108 | int numberOfTrainedSubsequences = 0; |
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| 109 | int sequenceMaxCount = 0; |
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| 110 | |
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| 111 | for (ITaskInstance currentTaskInstance : executedTasks) { |
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| 112 | int occurrenceCount = taskInstancesMap.get(currentTaskInstance).size(); |
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| 113 | |
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| 114 | if ((numberOfTrainedSubsequences % 10) == 0) { |
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| 115 | sequenceMaxCount = getCurrentSequenceMaxCount(); |
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| 116 | } |
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| 117 | |
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| 118 | if (occurrenceCount < sequenceMaxCount) { |
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| 119 | // this task instance does not need to be considered, as it occurs not often enough |
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| 120 | // to be part of a sequence, that occurs most often. Therefore train all remaining |
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| 121 | // sequences so far and go on, until the next useful sequence is found. |
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| 122 | |
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| 123 | while (subsequence.size() > 1) { |
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| 124 | add(subsequence); |
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| 125 | subsequence.remove(0); |
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| 126 | } |
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| 127 | |
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| 128 | subsequence.clear(); |
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| 129 | } |
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| 130 | else { |
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| 131 | subsequence.add(currentTaskInstance); |
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| 132 | |
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| 133 | if (subsequence.size() == maxOrder) { |
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| 134 | add(subsequence); |
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| 135 | subsequence.remove(0); |
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| 136 | |
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| 137 | numberOfTrainedSubsequences++; |
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| 138 | } |
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| 139 | } |
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| 140 | } |
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| 141 | |
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| 142 | // add shorter remaining subsequences, if any |
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| 143 | while (subsequence.size() > 1) { |
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| 144 | add(subsequence); |
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| 145 | subsequence.remove(0); |
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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 | * TODO: comment |
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| 152 | * </p> |
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| 153 | * |
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| 154 | * @return |
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| 155 | */ |
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| 156 | private int getCurrentSequenceMaxCount() { |
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| 157 | MaxSequenceCountFinder processor = new MaxSequenceCountFinder(); |
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| 158 | super.process(processor); |
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| 159 | return processor.getMaxCount(); |
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| 160 | } |
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| 161 | |
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| 162 | /** |
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| 163 | * @author Patrick Harms |
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| 164 | */ |
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| 165 | private class MaxSequenceCountFinder implements TrieProcessor<ITaskInstance> { |
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| 166 | |
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| 167 | /** |
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| 168 | * |
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| 169 | */ |
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| 170 | private int currentCount = 0; |
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| 171 | |
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| 172 | /* (non-Javadoc) |
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| 173 | * @see de.ugoe.cs.autoquest.usageprofiles.TrieProcessor#process(java.util.List, int) |
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| 174 | */ |
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| 175 | @Override |
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| 176 | public TrieProcessor.Result process(List<ITaskInstance> foundTask, int count) { |
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| 177 | if (foundTask.size() == 2) { |
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| 178 | this.currentCount = Math.max(this.currentCount, count); |
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| 179 | |
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| 180 | // do not consider children |
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| 181 | return TrieProcessor.Result.SKIP_NODE; |
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| 182 | } |
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| 183 | else { |
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| 184 | return TrieProcessor.Result.CONTINUE; |
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| 185 | } |
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| 186 | } |
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| 187 | |
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| 188 | /** |
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| 189 | * |
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| 190 | */ |
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| 191 | private int getMaxCount() { |
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| 192 | return currentCount; |
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| 193 | } |
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| 194 | |
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| 195 | } |
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| 196 | |
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| 197 | } |
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