[1113] | 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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[1107] | 15 | package de.ugoe.cs.autoquest.tasktrees.temporalrelation; |
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| 16 | |
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[1285] | 17 | import java.util.HashMap; |
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| 18 | import java.util.HashSet; |
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[1107] | 19 | import java.util.Iterator; |
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| 20 | import java.util.LinkedList; |
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| 21 | import java.util.List; |
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[1285] | 22 | import java.util.Map; |
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| 23 | import java.util.Set; |
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| 24 | import java.util.logging.Level; |
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[1107] | 25 | |
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[1146] | 26 | import de.ugoe.cs.autoquest.tasktrees.taskequality.TaskEquality; |
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[1127] | 27 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IIteration; |
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[1294] | 28 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IIterationInstance; |
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[1127] | 29 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISelection; |
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[1294] | 30 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISelectionInstance; |
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[1107] | 31 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequence; |
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[1294] | 32 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequenceInstance; |
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[1146] | 33 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask; |
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| 34 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskBuilder; |
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| 35 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskFactory; |
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| 36 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
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| 37 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstanceList; |
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| 38 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IUserSession; |
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[1256] | 39 | import de.ugoe.cs.autoquest.usageprofiles.SymbolMap; |
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[1119] | 40 | import de.ugoe.cs.autoquest.usageprofiles.TrieProcessor; |
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[1129] | 41 | import de.ugoe.cs.util.StopWatch; |
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[1285] | 42 | import de.ugoe.cs.util.console.Console; |
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[1107] | 43 | |
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| 44 | /** |
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| 45 | * <p> |
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| 46 | * TODO comment |
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| 47 | * </p> |
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| 48 | * |
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| 49 | * @author Patrick Harms |
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| 50 | */ |
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[1146] | 51 | class SequenceForTaskDetectionRule implements ISessionScopeRule { |
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[1107] | 52 | |
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| 53 | /** |
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| 54 | * <p> |
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[1146] | 55 | * the task factory to be used for creating substructures for the temporal |
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[1107] | 56 | * relationships identified during rule |
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| 57 | * </p> |
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| 58 | */ |
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[1146] | 59 | private ITaskFactory taskFactory; |
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[1107] | 60 | /** |
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| 61 | * <p> |
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[1146] | 62 | * the task builder to be used for creating substructures for the temporal relationships |
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[1107] | 63 | * identified during rule application |
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| 64 | * </p> |
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| 65 | */ |
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[1146] | 66 | private ITaskBuilder taskBuilder; |
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[1107] | 67 | |
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| 68 | /** |
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| 69 | * <p> |
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[1285] | 70 | * the task comparator to be used for comparing tasks for preparation |
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[1107] | 71 | * </p> |
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| 72 | */ |
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[1285] | 73 | private TaskHandlingStrategy preparationTaskHandlingStrategy; |
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| 74 | |
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[1107] | 75 | /** |
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| 76 | * <p> |
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[1285] | 77 | * the task comparator to be used for comparing tasks during iteration detection an trie |
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| 78 | * generation |
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| 79 | * </p> |
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| 80 | */ |
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| 81 | private TaskHandlingStrategy identityTaskHandlingStrategy;; |
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| 82 | |
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| 83 | /** |
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| 84 | * <p> |
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[1146] | 85 | * instantiates the rule and initializes it with a task equality rule manager and the minimal |
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| 86 | * task equality identified sublist must have to consider them as iterated. |
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[1107] | 87 | * </p> |
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| 88 | */ |
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[1189] | 89 | SequenceForTaskDetectionRule(TaskEquality minimalTaskEquality, |
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| 90 | ITaskFactory taskFactory, |
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| 91 | ITaskBuilder taskBuilder) |
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[1107] | 92 | { |
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[1146] | 93 | this.taskFactory = taskFactory; |
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| 94 | this.taskBuilder = taskBuilder; |
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[1107] | 95 | |
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[1285] | 96 | this.preparationTaskHandlingStrategy = new TaskHandlingStrategy(minimalTaskEquality); |
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| 97 | this.identityTaskHandlingStrategy = new TaskHandlingStrategy(TaskEquality.IDENTICAL); |
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[1107] | 98 | } |
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| 99 | |
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[1119] | 100 | /* (non-Javadoc) |
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| 101 | * @see java.lang.Object#toString() |
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| 102 | */ |
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| 103 | @Override |
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| 104 | public String toString() { |
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[1127] | 105 | return "SequenceForTaskDetectionRule"; |
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[1119] | 106 | } |
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| 107 | |
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[1146] | 108 | /* (non-Javadoc) |
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| 109 | * @see de.ugoe.cs.autoquest.tasktrees.temporalrelation.ISessionScopeRule#apply(java.util.List) |
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[1107] | 110 | */ |
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| 111 | @Override |
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[1146] | 112 | public RuleApplicationResult apply(List<IUserSession> sessions) { |
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[1127] | 113 | RuleApplicationData appData = new RuleApplicationData(sessions); |
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| 114 | |
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| 115 | // this is the real rule application. Loop while something is replaced. |
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[1256] | 116 | harmonizeEventTaskInstancesModel(appData); |
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[1107] | 117 | do { |
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[1127] | 118 | System.out.println(); |
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[1107] | 119 | |
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[1127] | 120 | appData.getStopWatch().start("whole loop"); |
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| 121 | detectAndReplaceIterations(appData); |
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[1133] | 122 | |
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[1127] | 123 | appData.getStopWatch().start("task replacement"); |
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| 124 | detectAndReplaceTasks(appData); |
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| 125 | appData.getStopWatch().stop("task replacement"); |
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| 126 | appData.getStopWatch().stop("whole loop"); |
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[1107] | 127 | |
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[1146] | 128 | //((TaskTreeNodeComparator) taskComparator).getStopWatch().dumpStatistics(System.out); |
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| 129 | //((TaskTreeNodeComparator) taskComparator).getStopWatch().reset(); |
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[1127] | 130 | |
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| 131 | appData.getStopWatch().dumpStatistics(System.out); |
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| 132 | appData.getStopWatch().reset(); |
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| 133 | |
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[1107] | 134 | } |
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[1146] | 135 | while (appData.detectedAndReplacedTasks()); |
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[1107] | 136 | |
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[1146] | 137 | System.out.println |
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| 138 | ("created " + appData.getResult().getNewlyCreatedTasks().size() + |
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| 139 | " new tasks and " + appData.getResult().getNewlyCreatedTaskInstances().size() + |
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| 140 | " appropriate instances\n"); |
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[1107] | 141 | |
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[1146] | 142 | if ((appData.getResult().getNewlyCreatedTasks().size() > 0) || |
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| 143 | (appData.getResult().getNewlyCreatedTaskInstances().size() > 0)) |
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| 144 | { |
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[1127] | 145 | appData.getResult().setRuleApplicationStatus(RuleApplicationStatus.FINISHED); |
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[1119] | 146 | } |
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| 147 | |
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[1127] | 148 | return appData.getResult(); |
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| 149 | } |
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| 150 | |
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| 151 | /** |
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[1256] | 152 | * <p> |
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| 153 | * TODO: comment |
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| 154 | * </p> |
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| 155 | * |
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[1127] | 156 | * @param appData |
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| 157 | */ |
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[1256] | 158 | private void harmonizeEventTaskInstancesModel(RuleApplicationData appData) { |
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[1285] | 159 | Console.traceln(Level.INFO, "harmonizing task model of event task instances"); |
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[1256] | 160 | appData.getStopWatch().start("harmonizing event tasks"); |
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[1285] | 161 | |
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| 162 | SymbolMap<ITaskInstance, ITask> uniqueTasks = |
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| 163 | preparationTaskHandlingStrategy.createSymbolMap(); |
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[1294] | 164 | TaskInstanceComparator comparator = preparationTaskHandlingStrategy.getTaskComparator(); |
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[1256] | 165 | |
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| 166 | int unifiedTasks = 0; |
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[1285] | 167 | ITask task; |
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[1256] | 168 | List<IUserSession> sessions = appData.getSessions(); |
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| 169 | for (IUserSession session : sessions) { |
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[1285] | 170 | Console.traceln(Level.FINE, "handling session " + session); |
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[1256] | 171 | for (ITaskInstance taskInstance : session) { |
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[1285] | 172 | task = uniqueTasks.getValue(taskInstance); |
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[1256] | 173 | |
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| 174 | if (task == null) { |
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[1285] | 175 | uniqueTasks.addSymbol(taskInstance, taskInstance.getTask()); |
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[1256] | 176 | } |
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| 177 | else { |
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| 178 | taskBuilder.setTask(taskInstance, task); |
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| 179 | unifiedTasks++; |
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| 180 | } |
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| 181 | } |
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[1285] | 182 | |
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| 183 | comparator.clearBuffers(); |
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[1256] | 184 | } |
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| 185 | |
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| 186 | appData.getStopWatch().stop("harmonizing event tasks"); |
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[1285] | 187 | Console.traceln(Level.INFO, "harmonized " + unifiedTasks + " task occurrences (still " + |
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| 188 | uniqueTasks.size() + " different tasks)"); |
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| 189 | |
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[1256] | 190 | appData.getStopWatch().dumpStatistics(System.out); |
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[1285] | 191 | appData.getStopWatch().reset(); |
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[1256] | 192 | } |
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| 193 | |
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| 194 | /** |
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| 195 | * @param appData |
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| 196 | */ |
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[1127] | 197 | private void detectAndReplaceIterations(RuleApplicationData appData) { |
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[1285] | 198 | Console.traceln(Level.FINE, "detecting iterations"); |
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[1127] | 199 | appData.getStopWatch().start("detecting iterations"); |
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[1119] | 200 | |
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[1146] | 201 | List<IUserSession> sessions = appData.getSessions(); |
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[1127] | 202 | |
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[1285] | 203 | Set<ITask> iteratedTasks = searchIteratedTasks(sessions); |
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[1146] | 204 | |
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[1285] | 205 | if (iteratedTasks.size() > 0) { |
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| 206 | replaceIterationsOf(iteratedTasks, sessions, appData); |
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[1127] | 207 | } |
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| 208 | |
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| 209 | appData.getStopWatch().stop("detecting iterations"); |
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[1285] | 210 | Console.traceln(Level.INFO, "replaced " + iteratedTasks.size() + " iterated tasks"); |
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[1127] | 211 | } |
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| 212 | |
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| 213 | /** |
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[1146] | 214 | * |
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[1127] | 215 | */ |
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[1285] | 216 | private Set<ITask> searchIteratedTasks(List<IUserSession> sessions) { |
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| 217 | Set<ITask> iteratedTasks = new HashSet<ITask>(); |
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[1146] | 218 | for (IUserSession session : sessions) { |
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| 219 | for (int i = 0; i < (session.size() - 1); i++) { |
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[1285] | 220 | // we prepared the task instances to refer to unique tasks, if they are treated |
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| 221 | // as equal. Therefore, we just compare the identity of the tasks of the task |
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| 222 | // instances |
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| 223 | if (session.get(i).getTask() == session.get(i + 1).getTask()) { |
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| 224 | iteratedTasks.add(session.get(i).getTask()); |
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[1146] | 225 | } |
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| 226 | } |
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| 227 | } |
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| 228 | |
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[1285] | 229 | return iteratedTasks; |
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[1146] | 230 | } |
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| 231 | |
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| 232 | /** |
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| 233 | * |
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| 234 | */ |
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[1285] | 235 | private void replaceIterationsOf(Set<ITask> iteratedTasks, |
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[1146] | 236 | List<IUserSession> sessions, |
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| 237 | RuleApplicationData appData) |
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[1127] | 238 | { |
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[1285] | 239 | Map<ITask, IIteration> iterations = new HashMap<ITask, IIteration>(); |
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[1294] | 240 | Map<IIteration, List<IIterationInstance>> iterationInstances = |
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| 241 | new HashMap<IIteration, List<IIterationInstance>>(); |
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[1285] | 242 | |
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| 243 | for (ITask iteratedTask : iteratedTasks) { |
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| 244 | IIteration iteration = taskFactory.createNewIteration(); |
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| 245 | iterations.put(iteratedTask, iteration); |
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[1294] | 246 | iterationInstances.put(iteration, new LinkedList<IIterationInstance>()); |
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[1285] | 247 | } |
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| 248 | |
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[1294] | 249 | IIterationInstance iterationInstance = null; |
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[1127] | 250 | |
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[1146] | 251 | for (IUserSession session : sessions) { |
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| 252 | int index = 0; |
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| 253 | while (index < session.size()) { |
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[1285] | 254 | // we prepared the task instances to refer to unique tasks, if they are treated |
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| 255 | // as equal. Therefore, we just compare the identity of the tasks of the task |
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| 256 | // instances |
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| 257 | ITask currentTask = session.get(index).getTask(); |
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| 258 | IIteration iteration = iterations.get(currentTask); |
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| 259 | if (iteration != null) { |
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| 260 | if ((iterationInstance == null) || (iterationInstance.getTask() != iteration)) |
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| 261 | { |
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[1146] | 262 | iterationInstance = taskFactory.createNewTaskInstance(iteration); |
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[1285] | 263 | iterationInstances.get(iteration).add(iterationInstance); |
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[1146] | 264 | taskBuilder.addTaskInstance(session, index, iterationInstance); |
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| 265 | index++; |
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| 266 | } |
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| 267 | |
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| 268 | taskBuilder.addChild(iterationInstance, session.get(index)); |
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| 269 | taskBuilder.removeTaskInstance(session, index); |
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| 270 | } |
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| 271 | else { |
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| 272 | if (iterationInstance != null) { |
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| 273 | iterationInstance = null; |
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| 274 | } |
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| 275 | index++; |
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| 276 | } |
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| 277 | } |
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| 278 | } |
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| 279 | |
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[1294] | 280 | for (Map.Entry<IIteration, List<IIterationInstance>> entry : iterationInstances.entrySet()) |
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| 281 | { |
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[1285] | 282 | harmonizeIterationInstancesModel(entry.getKey(), entry.getValue()); |
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| 283 | } |
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[1146] | 284 | } |
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[1127] | 285 | |
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[1146] | 286 | /** |
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| 287 | * |
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| 288 | */ |
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[1294] | 289 | private void harmonizeIterationInstancesModel(IIteration iteration, |
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| 290 | List<IIterationInstance> iterationInstances) |
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[1146] | 291 | { |
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| 292 | List<ITask> iteratedTaskVariants = new LinkedList<ITask>(); |
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[1294] | 293 | TaskInstanceComparator comparator = preparationTaskHandlingStrategy.getTaskComparator(); |
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[1146] | 294 | |
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| 295 | // merge the lexically different variants of iterated task to a unique list |
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[1294] | 296 | for (IIterationInstance iterationInstance : iterationInstances) { |
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[1146] | 297 | for (ITaskInstance executionVariant : iterationInstance) { |
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| 298 | ITask candidate = executionVariant.getTask(); |
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[1127] | 299 | |
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[1146] | 300 | boolean found = false; |
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| 301 | for (ITask taskVariant : iteratedTaskVariants) { |
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[1285] | 302 | if (comparator.areLexicallyEqual(taskVariant, candidate)) { |
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[1146] | 303 | taskBuilder.setTask(executionVariant, taskVariant); |
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| 304 | found = true; |
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| 305 | break; |
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| 306 | } |
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[1127] | 307 | } |
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[1146] | 308 | |
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| 309 | if (!found) { |
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| 310 | iteratedTaskVariants.add(candidate); |
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| 311 | } |
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[1107] | 312 | } |
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| 313 | } |
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| 314 | |
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[1146] | 315 | // if there are more than one lexically different variant of iterated tasks, adapt the |
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| 316 | // iteration model to be a selection of different variants. In this case also adapt |
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| 317 | // the generated iteration instances to correctly contain selection instances. If there |
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| 318 | // is only one variant of an iterated task, simply set this as the marked task of the |
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| 319 | // iteration. In this case, the instances can be preserved as is |
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| 320 | if (iteratedTaskVariants.size() > 1) { |
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| 321 | ISelection selection = taskFactory.createNewSelection(); |
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| 322 | |
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| 323 | for (ITask variant : iteratedTaskVariants) { |
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| 324 | taskBuilder.addChild(selection, variant); |
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| 325 | } |
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| 326 | |
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| 327 | taskBuilder.setMarkedTask(iteration, selection); |
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| 328 | |
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[1294] | 329 | for (IIterationInstance instance : iterationInstances) { |
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[1146] | 330 | for (int i = 0; i < instance.size(); i++) { |
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[1294] | 331 | ISelectionInstance selectionInstance = |
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| 332 | taskFactory.createNewTaskInstance(selection); |
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| 333 | taskBuilder.setChild(selectionInstance, instance.get(i)); |
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[1146] | 334 | taskBuilder.setTaskInstance(instance, i, selectionInstance); |
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| 335 | } |
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| 336 | } |
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| 337 | } |
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| 338 | else { |
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| 339 | taskBuilder.setMarkedTask(iteration, iteratedTaskVariants.get(0)); |
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| 340 | } |
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[1107] | 341 | } |
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| 342 | |
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| 343 | /** |
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[1127] | 344 | * @param appData |
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| 345 | */ |
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| 346 | private void detectAndReplaceTasks(RuleApplicationData appData) { |
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[1285] | 347 | Console.traceln(Level.FINE, "detecting and replacing tasks"); |
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[1127] | 348 | appData.getStopWatch().start("detecting tasks"); |
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| 349 | |
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| 350 | getSequencesOccuringMostOften(appData); |
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| 351 | |
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| 352 | appData.getStopWatch().stop("detecting tasks"); |
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| 353 | appData.getStopWatch().start("replacing tasks"); |
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| 354 | |
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| 355 | replaceSequencesOccurringMostOften(appData); |
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| 356 | |
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| 357 | appData.getStopWatch().stop("replacing tasks"); |
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[1285] | 358 | Console.traceln(Level.INFO, "detected and replaced " + appData.getLastFoundTasks().size() + |
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| 359 | " tasks occuring " + appData.getLastFoundTasks().getOccurrenceCount() + |
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[1287] | 360 | " times"); |
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[1127] | 361 | } |
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| 362 | |
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| 363 | /** |
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[1119] | 364 | * @return |
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[1107] | 365 | */ |
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[1127] | 366 | private void getSequencesOccuringMostOften(RuleApplicationData appData) { |
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[1285] | 367 | Console.traceln(Level.FINE, "determining most prominent tasks"); |
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[1119] | 368 | |
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[1127] | 369 | Tasks tasks; |
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[1119] | 370 | boolean createNewTrie = (appData.getLastTrie() == null) || |
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[1146] | 371 | appData.detectedAndReplacedTasks(); // tree has changed |
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[1107] | 372 | |
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[1119] | 373 | do { |
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| 374 | if (createNewTrie) { |
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| 375 | createNewTrie(appData); |
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| 376 | } |
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[1107] | 377 | |
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[1127] | 378 | MaxCountAndLongestTasksFinder finder = new MaxCountAndLongestTasksFinder(); |
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[1119] | 379 | appData.getLastTrie().process(finder); |
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| 380 | |
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[1127] | 381 | tasks = finder.getFoundTasks(); |
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[1119] | 382 | |
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| 383 | createNewTrie = false; |
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| 384 | |
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[1146] | 385 | for (List<ITaskInstance> task : tasks) { |
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[1119] | 386 | if (task.size() >= appData.getTrainedSequenceLength()) { |
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| 387 | // Trie must be recreated with a longer sequence length to be sure that |
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| 388 | // the found sequences occurring most often are found in their whole length |
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| 389 | appData.setTrainedSequenceLength(appData.getTrainedSequenceLength() + 1); |
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| 390 | createNewTrie = true; |
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| 391 | break; |
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| 392 | } |
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[1107] | 393 | } |
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| 394 | } |
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[1119] | 395 | while (createNewTrie); |
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| 396 | |
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[1256] | 397 | // create a normal trie for comparison |
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| 398 | /*System.out.println("creating test trie for comparison"); |
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| 399 | |
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| 400 | appData.getStopWatch().start("testtrie"); |
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[1285] | 401 | Trie<ITaskInstance> trie = new Trie<ITaskInstance>(identityTaskComparator); |
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[1256] | 402 | |
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| 403 | for (IUserSession session : appData.getSessions()) { |
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| 404 | trie.train(session.getExecutedTasks(), appData.getTrainedSequenceLength()); |
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| 405 | } |
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| 406 | |
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| 407 | appData.getStopWatch().stop("testtrie"); |
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| 408 | |
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| 409 | MaxCountAndLongestTasksFinder finder = new MaxCountAndLongestTasksFinder(); |
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| 410 | trie.process(finder); |
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| 411 | |
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| 412 | boolean allTasksEqual = finder.getFoundTasks().size() == tasks.size(); |
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| 413 | |
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| 414 | allTasksEqual &= finder.getFoundTasks().occurrenceCount == tasks.occurrenceCount; |
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| 415 | |
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| 416 | for (List<ITaskInstance> task1 : finder.getFoundTasks()) { |
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| 417 | boolean foundTask = false; |
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| 418 | for (List<ITaskInstance> task2 : tasks) { |
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| 419 | boolean tasksEqual = false; |
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| 420 | if (task1.size() == task2.size()) { |
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| 421 | tasksEqual = true; |
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| 422 | for (int i = 0; i < task1.size(); i++) { |
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[1285] | 423 | if (!identityTaskComparator.equals(task1.get(i).getTask(), task2.get(i).getTask())) |
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[1256] | 424 | { |
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| 425 | tasksEqual = false; |
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| 426 | } |
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| 427 | } |
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| 428 | } |
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| 429 | |
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| 430 | if (tasksEqual) { |
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| 431 | foundTask = true; |
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| 432 | break; |
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| 433 | } |
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| 434 | } |
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| 435 | |
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| 436 | if (!foundTask) { |
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| 437 | System.out.println("different is " + task1); |
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| 438 | allTasksEqual = false; |
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| 439 | break; |
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| 440 | } |
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| 441 | } |
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| 442 | |
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| 443 | if (!allTasksEqual) { |
---|
| 444 | System.out.println(finder.getFoundTasks()); |
---|
| 445 | System.out.println(tasks); |
---|
| 446 | |
---|
| 447 | throw new IllegalArgumentException("both tries calculated different subsequences"); |
---|
[1285] | 448 | } |
---|
[1256] | 449 | |
---|
| 450 | /*TrieStatisticsDumper dumper = new TrieStatisticsDumper(); |
---|
| 451 | appData.getLastTrie().process(dumper); |
---|
| 452 | dumper.dumpCounters();*/ |
---|
| 453 | |
---|
[1127] | 454 | appData.setLastFoundTasks(tasks); |
---|
| 455 | |
---|
[1285] | 456 | Console.traceln(Level.FINE, "found " + appData.getLastFoundTasks().size() + " tasks " + |
---|
| 457 | "occurring " + appData.getLastFoundTasks().getOccurrenceCount() + " times"); |
---|
[1107] | 458 | } |
---|
| 459 | |
---|
| 460 | /** |
---|
[1119] | 461 | * @param parent |
---|
| 462 | * @return |
---|
[1107] | 463 | */ |
---|
[1127] | 464 | private void createNewTrie(RuleApplicationData appData) { |
---|
[1285] | 465 | Console.traceln(Level.FINER, "training trie with a maximum sequence length of " + |
---|
| 466 | appData.getTrainedSequenceLength()); |
---|
[1119] | 467 | |
---|
| 468 | appData.getStopWatch().start("training trie"); |
---|
[1285] | 469 | |
---|
| 470 | // we prepared the task instances to refer to unique tasks, if they are treated |
---|
| 471 | // as equal. Therefore, we just compare the identity of the tasks of the task |
---|
| 472 | // instances |
---|
| 473 | appData.setLastTrie(new TaskInstanceTrie(identityTaskHandlingStrategy)); |
---|
[1119] | 474 | |
---|
[1256] | 475 | appData.getLastTrie().trainSessions |
---|
| 476 | (appData.getSessions(), appData.getTrainedSequenceLength()); |
---|
[1127] | 477 | |
---|
[1119] | 478 | appData.getStopWatch().stop("training trie"); |
---|
| 479 | } |
---|
| 480 | |
---|
| 481 | /** |
---|
[1127] | 482 | * @param appData |
---|
| 483 | */ |
---|
| 484 | private void replaceSequencesOccurringMostOften(RuleApplicationData appData) { |
---|
[1146] | 485 | appData.detectedAndReplacedTasks(false); |
---|
[1127] | 486 | |
---|
| 487 | if ((appData.getLastFoundTasks().size() > 0) && |
---|
| 488 | (appData.getLastFoundTasks().getOccurrenceCount() > 1)) |
---|
| 489 | { |
---|
[1285] | 490 | Console.traceln(Level.FINER, "replacing tasks occurrences"); |
---|
[1127] | 491 | |
---|
[1146] | 492 | for (List<ITaskInstance> task : appData.getLastFoundTasks()) { |
---|
| 493 | ISequence sequence = taskFactory.createNewSequence(); |
---|
| 494 | |
---|
[1285] | 495 | Console.traceln(Level.FINEST, "replacing " + sequence.getId() + ": " + task); |
---|
[1127] | 496 | |
---|
[1294] | 497 | List<ISequenceInstance> sequenceInstances = |
---|
[1146] | 498 | replaceTaskOccurrences(task, appData.getSessions(), sequence); |
---|
[1119] | 499 | |
---|
[1146] | 500 | harmonizeSequenceInstancesModel(sequence, sequenceInstances,task.size()); |
---|
[1285] | 501 | appData.detectedAndReplacedTasks |
---|
| 502 | (appData.detectedAndReplacedTasks() || (sequenceInstances.size() > 0)); |
---|
[1127] | 503 | |
---|
[1146] | 504 | if (sequenceInstances.size() < appData.getLastFoundTasks().getOccurrenceCount()) { |
---|
[1285] | 505 | Console.traceln(Level.FINE, sequence.getId() + ": replaced task only " + |
---|
| 506 | sequenceInstances.size() + " times instead of expected " + |
---|
| 507 | appData.getLastFoundTasks().getOccurrenceCount()); |
---|
[1127] | 508 | } |
---|
| 509 | } |
---|
| 510 | } |
---|
| 511 | |
---|
| 512 | } |
---|
| 513 | |
---|
| 514 | /** |
---|
[1146] | 515 | * |
---|
| 516 | */ |
---|
[1294] | 517 | private void harmonizeSequenceInstancesModel(ISequence sequence, |
---|
| 518 | List<ISequenceInstance> sequenceInstances, |
---|
| 519 | int sequenceLength) |
---|
[1146] | 520 | { |
---|
[1294] | 521 | TaskInstanceComparator comparator = preparationTaskHandlingStrategy.getTaskComparator(); |
---|
[1146] | 522 | |
---|
| 523 | // ensure for each subtask that lexically different variants are preserved |
---|
| 524 | for (int subTaskIndex = 0; subTaskIndex < sequenceLength; subTaskIndex++) { |
---|
| 525 | List<ITask> subTaskVariants = new LinkedList<ITask>(); |
---|
| 526 | |
---|
[1294] | 527 | for (ISequenceInstance sequenceInstance : sequenceInstances) { |
---|
[1146] | 528 | ITask candidate = sequenceInstance.get(subTaskIndex).getTask(); |
---|
| 529 | |
---|
| 530 | boolean found = false; |
---|
| 531 | |
---|
| 532 | for (int i = 0; i < subTaskVariants.size(); i++) { |
---|
[1285] | 533 | if (comparator.areLexicallyEqual(subTaskVariants.get(i), candidate)) { |
---|
[1146] | 534 | taskBuilder.setTask |
---|
| 535 | (sequenceInstance.get(subTaskIndex), subTaskVariants.get(i)); |
---|
| 536 | |
---|
| 537 | found = true; |
---|
| 538 | break; |
---|
| 539 | } |
---|
| 540 | } |
---|
| 541 | |
---|
| 542 | if (!found) { |
---|
| 543 | subTaskVariants.add(candidate); |
---|
| 544 | } |
---|
| 545 | } |
---|
| 546 | |
---|
| 547 | // if there are more than one lexically different variant of the sub task at |
---|
| 548 | // the considered position, adapt the sequence model at that position to have |
---|
| 549 | // a selection of the different variants. In this case also adapt the |
---|
| 550 | // generated sequence instances to correctly contain selection instances. If |
---|
| 551 | // there is only one variant of sub tasks at the given position, simply set |
---|
| 552 | // this variant as the sub task of the selection. In this case, the instances |
---|
| 553 | // can be preserved as is |
---|
| 554 | if (subTaskVariants.size() > 1) { |
---|
| 555 | ISelection selection = taskFactory.createNewSelection(); |
---|
| 556 | |
---|
| 557 | for (ITask variant : subTaskVariants) { |
---|
| 558 | taskBuilder.addChild(selection, variant); |
---|
| 559 | } |
---|
| 560 | |
---|
| 561 | taskBuilder.addChild(sequence, selection); |
---|
| 562 | |
---|
[1294] | 563 | for (ISequenceInstance instance : sequenceInstances) { |
---|
| 564 | ISelectionInstance selectionInstance = |
---|
[1146] | 565 | taskFactory.createNewTaskInstance(selection); |
---|
[1294] | 566 | taskBuilder.setChild(selectionInstance, instance.get(subTaskIndex)); |
---|
[1146] | 567 | taskBuilder.setTaskInstance(instance, subTaskIndex, selectionInstance); |
---|
| 568 | } |
---|
| 569 | } |
---|
| 570 | else if (subTaskVariants.size() == 1) { |
---|
| 571 | taskBuilder.addChild(sequence, subTaskVariants.get(0)); |
---|
| 572 | } |
---|
| 573 | } |
---|
| 574 | } |
---|
| 575 | |
---|
| 576 | /** |
---|
[1127] | 577 | * @param tree |
---|
| 578 | */ |
---|
[1294] | 579 | private List<ISequenceInstance> replaceTaskOccurrences(List<ITaskInstance> task, |
---|
| 580 | List<IUserSession> sessions, |
---|
| 581 | ISequence temporalTaskModel) |
---|
[1127] | 582 | { |
---|
[1294] | 583 | List<ISequenceInstance> sequenceInstances = new LinkedList<ISequenceInstance>(); |
---|
[1146] | 584 | |
---|
| 585 | for (IUserSession session : sessions) { |
---|
[1127] | 586 | int index = -1; |
---|
[1119] | 587 | |
---|
[1127] | 588 | do { |
---|
[1146] | 589 | index = getSubListIndex(session, task, ++index); |
---|
[1127] | 590 | |
---|
| 591 | if (index > -1) { |
---|
[1146] | 592 | sequenceInstances.add |
---|
| 593 | (RuleUtils.createNewSubSequenceInRange |
---|
| 594 | (session, index, index + task.size() - 1, temporalTaskModel, |
---|
| 595 | taskFactory, taskBuilder)); |
---|
[1107] | 596 | } |
---|
| 597 | } |
---|
[1127] | 598 | while (index > -1); |
---|
[1107] | 599 | } |
---|
[1146] | 600 | |
---|
| 601 | return sequenceInstances; |
---|
[1107] | 602 | } |
---|
| 603 | |
---|
| 604 | /** |
---|
[1146] | 605 | * @param trie |
---|
| 606 | * @param object |
---|
[1127] | 607 | * @return |
---|
| 608 | */ |
---|
[1146] | 609 | private int getSubListIndex(ITaskInstanceList list, |
---|
| 610 | List<ITaskInstance> subList, |
---|
| 611 | int startIndex) |
---|
[1127] | 612 | { |
---|
[1146] | 613 | boolean matchFound; |
---|
| 614 | int result = -1; |
---|
[1127] | 615 | |
---|
[1146] | 616 | for (int i = startIndex; i <= list.size() - subList.size(); i++) { |
---|
| 617 | matchFound = true; |
---|
[1127] | 618 | |
---|
[1146] | 619 | for (int j = 0; j < subList.size(); j++) { |
---|
[1285] | 620 | // we prepared the task instances to refer to unique tasks, if they are treated |
---|
| 621 | // as equal. Therefore, we just compare the identity of the tasks of the task |
---|
| 622 | // instances |
---|
| 623 | if (list.get(i + j).getTask() != subList.get(j).getTask()) { |
---|
[1146] | 624 | matchFound = false; |
---|
| 625 | break; |
---|
| 626 | } |
---|
[1127] | 627 | } |
---|
| 628 | |
---|
[1146] | 629 | if (matchFound) { |
---|
| 630 | result = i; |
---|
| 631 | break; |
---|
| 632 | } |
---|
[1127] | 633 | } |
---|
[1107] | 634 | |
---|
[1146] | 635 | return result; |
---|
[1107] | 636 | } |
---|
| 637 | |
---|
| 638 | /** |
---|
| 639 | * @param trie |
---|
| 640 | * @param object |
---|
| 641 | * @return |
---|
| 642 | */ |
---|
[1146] | 643 | private int getSubListIndex(List<ITaskInstance> list, |
---|
| 644 | List<ITaskInstance> subList, |
---|
[1107] | 645 | int startIndex) |
---|
| 646 | { |
---|
| 647 | boolean matchFound; |
---|
| 648 | int result = -1; |
---|
| 649 | |
---|
| 650 | for (int i = startIndex; i <= list.size() - subList.size(); i++) { |
---|
| 651 | matchFound = true; |
---|
| 652 | |
---|
| 653 | for (int j = 0; j < subList.size(); j++) { |
---|
[1285] | 654 | // we prepared the task instances to refer to unique tasks, if they are treated |
---|
| 655 | // as equal. Therefore, we just compare the identity of the tasks of the task |
---|
| 656 | // instances |
---|
| 657 | if (list.get(i + j) != subList.get(j)) { |
---|
[1107] | 658 | matchFound = false; |
---|
| 659 | break; |
---|
| 660 | } |
---|
| 661 | } |
---|
| 662 | |
---|
| 663 | if (matchFound) { |
---|
| 664 | result = i; |
---|
| 665 | break; |
---|
| 666 | } |
---|
| 667 | } |
---|
| 668 | |
---|
| 669 | return result; |
---|
| 670 | } |
---|
| 671 | |
---|
[1119] | 672 | /** |
---|
| 673 | * @author Patrick Harms |
---|
| 674 | */ |
---|
[1146] | 675 | private class MaxCountAndLongestTasksFinder implements TrieProcessor<ITaskInstance> { |
---|
[1119] | 676 | |
---|
| 677 | /** |
---|
| 678 | * |
---|
| 679 | */ |
---|
| 680 | private int currentCount; |
---|
| 681 | |
---|
| 682 | /** |
---|
| 683 | * |
---|
| 684 | */ |
---|
[1146] | 685 | private List<List<ITaskInstance>> foundTasks = new LinkedList<List<ITaskInstance>>(); |
---|
[1119] | 686 | |
---|
| 687 | /** |
---|
| 688 | * |
---|
| 689 | */ |
---|
[1127] | 690 | public MaxCountAndLongestTasksFinder() { |
---|
[1119] | 691 | super(); |
---|
| 692 | this.currentCount = 0; |
---|
| 693 | } |
---|
| 694 | |
---|
| 695 | /* (non-Javadoc) |
---|
| 696 | * @see de.ugoe.cs.autoquest.usageprofiles.TrieProcessor#process(java.util.List, int) |
---|
| 697 | */ |
---|
| 698 | @Override |
---|
[1146] | 699 | public TrieProcessor.Result process(List<ITaskInstance> foundTask, int count) { |
---|
| 700 | if (foundTask.size() < 2) { |
---|
| 701 | // ignore single tasks |
---|
[1119] | 702 | return TrieProcessor.Result.CONTINUE; |
---|
| 703 | } |
---|
| 704 | |
---|
| 705 | if (count < 2) { |
---|
| 706 | // ignore singular occurrences |
---|
| 707 | return TrieProcessor.Result.SKIP_NODE; |
---|
| 708 | } |
---|
| 709 | |
---|
| 710 | if (this.currentCount > count) { |
---|
[1146] | 711 | // ignore this children of this task, as they may have only smaller counts than |
---|
[1127] | 712 | // the already found tasks |
---|
[1119] | 713 | return TrieProcessor.Result.SKIP_NODE; |
---|
| 714 | } |
---|
| 715 | |
---|
| 716 | if (this.currentCount < count) { |
---|
[1127] | 717 | // the provided task occurs more often that all tasks found so far. |
---|
| 718 | // clear all found tasks and use the new count as the one searched for |
---|
| 719 | foundTasks.clear(); |
---|
[1119] | 720 | this.currentCount = count; |
---|
| 721 | } |
---|
| 722 | |
---|
| 723 | if (this.currentCount == count) { |
---|
[1127] | 724 | // the task is of interest. Sort it into the other found tasks so that |
---|
[1119] | 725 | // the longest come first |
---|
| 726 | boolean added = false; |
---|
[1127] | 727 | for (int i = 0; i < foundTasks.size(); i++) { |
---|
[1146] | 728 | if (foundTasks.get(i).size() < foundTask.size()) { |
---|
[1119] | 729 | // defensive copy |
---|
[1146] | 730 | foundTasks.add(i, new LinkedList<ITaskInstance>(foundTask)); // defensive copy |
---|
[1119] | 731 | added = true; |
---|
| 732 | break; |
---|
| 733 | } |
---|
| 734 | } |
---|
| 735 | |
---|
| 736 | if (!added) { |
---|
[1146] | 737 | foundTasks.add(new LinkedList<ITaskInstance>(foundTask)); // defensive copy |
---|
[1119] | 738 | } |
---|
| 739 | } |
---|
| 740 | |
---|
| 741 | return TrieProcessor.Result.CONTINUE; |
---|
| 742 | } |
---|
| 743 | |
---|
| 744 | /** |
---|
[1133] | 745 | * @return |
---|
[1119] | 746 | */ |
---|
[1127] | 747 | public Tasks getFoundTasks() { |
---|
[1119] | 748 | removePermutationsOfShorterTasks(); |
---|
[1127] | 749 | return new Tasks(currentCount, foundTasks); |
---|
[1119] | 750 | } |
---|
| 751 | |
---|
| 752 | /** |
---|
| 753 | * |
---|
| 754 | */ |
---|
| 755 | private void removePermutationsOfShorterTasks() { |
---|
| 756 | // now iterate the sorted list and for each task remove all other tasks that are shorter |
---|
| 757 | // (i.e. come later in the sorted list) and that represent a subpart of the task |
---|
[1127] | 758 | for (int i = 0; i < foundTasks.size(); i++) { |
---|
| 759 | for (int j = i + 1; j < foundTasks.size();) { |
---|
| 760 | if (foundTasks.get(j).size() < foundTasks.get(i).size()) { |
---|
[1119] | 761 | // found a task that is a potential subtask. Check for this and remove the |
---|
| 762 | // subtask if needed |
---|
[1146] | 763 | List<ITaskInstance> longTask = foundTasks.get(i); |
---|
| 764 | List<ITaskInstance> shortTask = foundTasks.get(j); |
---|
[1119] | 765 | |
---|
| 766 | if (getSubListIndex(longTask, shortTask, 0) > -1) { |
---|
[1127] | 767 | foundTasks.remove(j); |
---|
[1119] | 768 | } |
---|
| 769 | else { |
---|
| 770 | j++; |
---|
| 771 | } |
---|
| 772 | } |
---|
| 773 | else { |
---|
| 774 | j++; |
---|
| 775 | } |
---|
| 776 | } |
---|
| 777 | } |
---|
| 778 | } |
---|
| 779 | |
---|
| 780 | } |
---|
| 781 | |
---|
[1256] | 782 | // /** |
---|
| 783 | // * @author Patrick Harms |
---|
| 784 | // */ |
---|
| 785 | // private class TrieStatisticsDumper implements TrieProcessor<ITaskInstance> { |
---|
| 786 | // |
---|
| 787 | // /** |
---|
| 788 | // * |
---|
| 789 | // */ |
---|
| 790 | // private Map<Integer, Integer> counters = new HashMap<Integer, Integer>(); |
---|
| 791 | // |
---|
| 792 | // /* (non-Javadoc) |
---|
| 793 | // * @see de.ugoe.cs.autoquest.usageprofiles.TrieProcessor#process(java.util.List, int) |
---|
| 794 | // */ |
---|
| 795 | // @Override |
---|
| 796 | // public TrieProcessor.Result process(List<ITaskInstance> subsequence, int count) { |
---|
| 797 | // if (subsequence.size() == 1) { |
---|
| 798 | // Integer value = counters.get(count); |
---|
| 799 | // |
---|
| 800 | // if (value == null) { |
---|
| 801 | // value = 0; |
---|
| 802 | // } |
---|
| 803 | // |
---|
| 804 | // counters.put(count, value + 1); |
---|
| 805 | // |
---|
| 806 | // return TrieProcessor.Result.CONTINUE; |
---|
| 807 | // } |
---|
| 808 | // else { |
---|
| 809 | // // ignore singular occurrences |
---|
| 810 | // return TrieProcessor.Result.SKIP_NODE; |
---|
| 811 | // } |
---|
| 812 | // } |
---|
| 813 | // |
---|
| 814 | // /** |
---|
| 815 | // * @return |
---|
| 816 | // */ |
---|
| 817 | // public void dumpCounters() { |
---|
| 818 | // int dumpedCounters = 0; |
---|
| 819 | // |
---|
| 820 | // int count = 1; |
---|
| 821 | // while (dumpedCounters < counters.size()) { |
---|
| 822 | // Integer value = counters.get(count++); |
---|
| 823 | // if (value != null) { |
---|
| 824 | // System.out.println(value + " symbols occurred " + count + " times"); |
---|
| 825 | // dumpedCounters++; |
---|
| 826 | // } |
---|
| 827 | // } |
---|
| 828 | // } |
---|
| 829 | // |
---|
| 830 | // } |
---|
| 831 | |
---|
[1119] | 832 | /** |
---|
| 833 | * |
---|
| 834 | */ |
---|
[1133] | 835 | private static class RuleApplicationData { |
---|
[1119] | 836 | |
---|
| 837 | /** |
---|
| 838 | * |
---|
| 839 | */ |
---|
[1146] | 840 | private List<IUserSession> sessions; |
---|
[1119] | 841 | |
---|
| 842 | /** |
---|
| 843 | * |
---|
| 844 | */ |
---|
[1256] | 845 | private TaskInstanceTrie lastTrie; |
---|
[1119] | 846 | |
---|
| 847 | /** |
---|
[1127] | 848 | * default and minimum trained sequence length is 3 |
---|
[1119] | 849 | */ |
---|
[1127] | 850 | private int trainedSequenceLength = 3; |
---|
[1119] | 851 | |
---|
| 852 | /** |
---|
| 853 | * |
---|
| 854 | */ |
---|
[1127] | 855 | private Tasks lastFoundTasks = new Tasks(Integer.MAX_VALUE, null); |
---|
[1119] | 856 | |
---|
| 857 | /** |
---|
[1127] | 858 | * |
---|
[1119] | 859 | */ |
---|
[1146] | 860 | private boolean detectedAndReplacedTasks; |
---|
[1119] | 861 | |
---|
| 862 | /** |
---|
| 863 | * |
---|
| 864 | */ |
---|
[1127] | 865 | private RuleApplicationResult result = new RuleApplicationResult(); |
---|
| 866 | |
---|
| 867 | /** |
---|
| 868 | * |
---|
| 869 | */ |
---|
[1119] | 870 | private StopWatch stopWatch = new StopWatch(); |
---|
| 871 | |
---|
| 872 | /** |
---|
| 873 | * |
---|
| 874 | */ |
---|
[1146] | 875 | private RuleApplicationData(List<IUserSession> sessions) { |
---|
[1127] | 876 | this.sessions = sessions; |
---|
[1119] | 877 | } |
---|
| 878 | |
---|
| 879 | /** |
---|
[1127] | 880 | * @return the tree |
---|
[1119] | 881 | */ |
---|
[1146] | 882 | private List<IUserSession> getSessions() { |
---|
[1127] | 883 | return sessions; |
---|
[1119] | 884 | } |
---|
| 885 | |
---|
| 886 | /** |
---|
[1127] | 887 | * @param lastTrie the lastTrie to set |
---|
[1119] | 888 | */ |
---|
[1256] | 889 | private void setLastTrie(TaskInstanceTrie lastTrie) { |
---|
[1127] | 890 | this.lastTrie = lastTrie; |
---|
[1119] | 891 | } |
---|
| 892 | |
---|
| 893 | /** |
---|
| 894 | * @return the lastTrie |
---|
| 895 | */ |
---|
[1256] | 896 | private TaskInstanceTrie getLastTrie() { |
---|
[1119] | 897 | return lastTrie; |
---|
| 898 | } |
---|
| 899 | |
---|
| 900 | /** |
---|
[1127] | 901 | * @param trainedSequenceLength the trainedSequenceLength to set |
---|
| 902 | */ |
---|
| 903 | private void setTrainedSequenceLength(int trainedSequenceLength) { |
---|
| 904 | this.trainedSequenceLength = trainedSequenceLength; |
---|
| 905 | } |
---|
| 906 | |
---|
| 907 | /** |
---|
[1119] | 908 | * @return the trainedSequenceLength |
---|
| 909 | */ |
---|
| 910 | private int getTrainedSequenceLength() { |
---|
| 911 | return trainedSequenceLength; |
---|
| 912 | } |
---|
| 913 | |
---|
| 914 | /** |
---|
[1127] | 915 | * @param lastFoundSequences the lastFoundSequences to set |
---|
[1119] | 916 | */ |
---|
[1127] | 917 | private void setLastFoundTasks(Tasks lastFoundSequences) { |
---|
| 918 | this.lastFoundTasks = lastFoundSequences; |
---|
[1119] | 919 | } |
---|
| 920 | |
---|
| 921 | /** |
---|
[1127] | 922 | * @return the lastFoundSequences |
---|
[1119] | 923 | */ |
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[1127] | 924 | private Tasks getLastFoundTasks() { |
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| 925 | return lastFoundTasks; |
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[1119] | 926 | } |
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| 927 | |
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| 928 | /** |
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| 929 | * |
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| 930 | */ |
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[1146] | 931 | private void detectedAndReplacedTasks(boolean detectedAndReplacedTasks) { |
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| 932 | this.detectedAndReplacedTasks = detectedAndReplacedTasks; |
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[1119] | 933 | } |
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| 934 | |
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| 935 | /** |
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| 936 | * |
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| 937 | */ |
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[1146] | 938 | private boolean detectedAndReplacedTasks() { |
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| 939 | return detectedAndReplacedTasks; |
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[1119] | 940 | } |
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[1127] | 941 | |
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| 942 | /** |
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| 943 | * @return the result |
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| 944 | */ |
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| 945 | private RuleApplicationResult getResult() { |
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| 946 | return result; |
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| 947 | } |
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| 948 | |
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| 949 | /** |
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| 950 | * @return the stopWatch |
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| 951 | */ |
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| 952 | private StopWatch getStopWatch() { |
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| 953 | return stopWatch; |
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| 954 | } |
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| 955 | |
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[1119] | 956 | } |
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| 957 | |
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| 958 | |
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| 959 | /** |
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| 960 | * @author Patrick Harms |
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| 961 | */ |
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[1146] | 962 | private static class Tasks implements Iterable<List<ITaskInstance>> { |
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[1119] | 963 | |
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| 964 | /** |
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| 965 | * |
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| 966 | */ |
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| 967 | private int occurrenceCount; |
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| 968 | |
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| 969 | /** |
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| 970 | * |
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| 971 | */ |
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[1146] | 972 | private List<List<ITaskInstance>> sequences; |
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[1119] | 973 | |
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| 974 | /** |
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| 975 | * @param occurrenceCount |
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| 976 | * @param sequences |
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| 977 | */ |
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[1146] | 978 | private Tasks(int occurrenceCount, List<List<ITaskInstance>> sequences) { |
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[1119] | 979 | super(); |
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| 980 | this.occurrenceCount = occurrenceCount; |
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| 981 | this.sequences = sequences; |
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| 982 | } |
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| 983 | |
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| 984 | /** |
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| 985 | * @return |
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| 986 | */ |
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| 987 | private int getOccurrenceCount() { |
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| 988 | return occurrenceCount; |
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| 989 | } |
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| 990 | |
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| 991 | /** |
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| 992 | * @return |
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| 993 | */ |
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| 994 | private int size() { |
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| 995 | return this.sequences.size(); |
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| 996 | } |
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| 997 | |
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| 998 | /** |
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| 999 | * |
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| 1000 | */ |
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| 1001 | |
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| 1002 | /* (non-Javadoc) |
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| 1003 | * @see java.lang.Iterable#iterator() |
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| 1004 | */ |
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| 1005 | @Override |
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[1146] | 1006 | public Iterator<List<ITaskInstance>> iterator() { |
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[1119] | 1007 | return this.sequences.iterator(); |
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| 1008 | } |
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| 1009 | |
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[1146] | 1010 | /* (non-Javadoc) |
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[1256] | 1011 | * @see java.lang.Object#toString() |
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[1146] | 1012 | */ |
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| 1013 | @Override |
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[1256] | 1014 | public String toString() { |
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| 1015 | StringBuffer result = new StringBuffer(); |
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| 1016 | result.append(this.occurrenceCount); |
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| 1017 | result.append(" occurrences:\n"); |
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[1146] | 1018 | |
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[1256] | 1019 | for (List<ITaskInstance> task : sequences) { |
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| 1020 | result.append(task); |
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| 1021 | result.append("\n"); |
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[1146] | 1022 | } |
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| 1023 | |
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[1256] | 1024 | return result.toString(); |
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[1146] | 1025 | } |
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| 1026 | |
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| 1027 | } |
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[1107] | 1028 | } |
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