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.manager; |
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16 | |
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17 | import java.util.Collection; |
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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.logging.Level; |
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21 | |
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22 | import de.ugoe.cs.autoquest.eventcore.Event; |
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23 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTask; |
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24 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskModel; |
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25 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskBuilder; |
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26 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskFactory; |
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27 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IUserSession; |
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28 | import de.ugoe.cs.util.console.Console; |
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29 | |
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30 | /** |
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31 | * <p> |
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32 | * The task tree manager is responsible for transforming one or more user |
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33 | * sessions into a task model. It can be called by providing a collection of |
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34 | * user sessions where the result will be a task model. Furthermore, it can be |
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35 | * used by providing single events in their respective order including |
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36 | * notifications about where a user session ends. The result is a task model, as |
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37 | * well. |
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38 | * </p> |
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39 | * |
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40 | * @version 1.0 |
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41 | * @author pharms |
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42 | */ |
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43 | public class TaskTreeManager { |
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44 | |
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45 | /** |
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46 | * <p> |
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47 | * the internally used task builder |
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48 | * </p> |
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49 | */ |
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50 | private final ITaskBuilder taskBuilder = ComponentManager |
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51 | .getDefaultTaskBuilder(); |
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52 | |
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53 | /** |
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54 | * <p> |
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55 | * the internally used task factory |
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56 | * </p> |
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57 | */ |
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58 | private final ITaskFactory taskFactory = ComponentManager |
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59 | .getDefaultTaskFactory(); |
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60 | |
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61 | /** |
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62 | * <p> |
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63 | * if single events are provided, the user sessions collected so far |
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64 | * </p> |
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65 | */ |
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66 | private List<IUserSession> sessions = null; |
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67 | |
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68 | /** |
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69 | * <p> |
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70 | * if single events are provided, the currently collected user session |
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71 | * </p> |
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72 | */ |
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73 | private IUserSession currentSession = null; |
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74 | |
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75 | /** |
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76 | * <p> |
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77 | * initializes the task tree manager |
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78 | * </p> |
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79 | */ |
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80 | public TaskTreeManager() { |
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81 | sessions = new LinkedList<IUserSession>(); |
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82 | } |
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83 | |
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84 | /** |
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85 | * <p> |
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86 | * internally asserts that there is a current session to add new events to |
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87 | * </p> |
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88 | */ |
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89 | private void assertSessionSequence() { |
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90 | if (currentSession == null) { |
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91 | currentSession = taskFactory.createUserSession(); |
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92 | } |
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93 | } |
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94 | |
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95 | /** |
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96 | * <p> |
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97 | * creates a task model based on the provided user sessions. Yet, the user |
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98 | * sessions are list of events. Such will be transformed in into task |
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99 | * instances of event tasks assigned to {@link IUserSession}s. The |
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100 | * {@link IUserSession}s will then be restructured using the temporal |
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101 | * relationship rule manager to detect tasks and respective instances. The |
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102 | * results of this transformation is stored in a task model which is the |
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103 | * return value of this method. |
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104 | * </p> |
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105 | * |
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106 | * @param newSessions |
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107 | * the user sessions of which the task model shall be created |
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108 | * |
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109 | * @return the task model created from the user sessions |
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110 | * |
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111 | * @throws IllegalStateException |
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112 | * if the task manager is already used by providing it with |
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113 | * single events |
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114 | */ |
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115 | public synchronized ITaskModel createTaskModel( |
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116 | Collection<List<Event>> newSessions) { |
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117 | if ((currentSession != null) || (sessions.size() > 0)) { |
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118 | throw new IllegalStateException( |
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119 | "do not mix calls to this method with calls to the " |
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120 | + "other methods for handling tasks. Use only one " |
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121 | + "variant instead."); |
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122 | } |
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123 | |
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124 | for (final List<Event> newSession : newSessions) { |
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125 | if (newSession.size() > 0) { |
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126 | for (final Event event : newSession) { |
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127 | handleNewEvent(event); |
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128 | } |
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129 | finishSession(); |
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130 | } |
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131 | } |
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132 | |
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133 | return getTaskModel(); |
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134 | } |
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135 | |
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136 | /** |
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137 | * <p> |
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138 | * used to denote, that all previously added events using |
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139 | * {@link #handleNewEvent(Event)} belong to the same session and that this |
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140 | * session is now complete. All further events will be added to a new |
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141 | * session which may be ended using this method, as well. |
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142 | * </p> |
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143 | */ |
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144 | public void finishSession() { |
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145 | if ((currentSession != null) && (currentSession.size() > 0)) { |
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146 | sessions.add(currentSession); |
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147 | currentSession = null; |
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148 | } |
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149 | } |
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150 | |
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151 | /** |
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152 | * <p> |
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153 | * returns the task model, that belongs to the events in the user sessions |
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154 | * collected so far. |
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155 | * </p> |
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156 | * |
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157 | * @return the task model |
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158 | */ |
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159 | public synchronized ITaskModel getTaskModel() { |
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160 | finishSession(); |
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161 | |
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162 | Console.traceln(Level.INFO, |
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163 | "applying temporal relationship generation rules"); |
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164 | |
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165 | ComponentManager.getTemporalRelationshipRuleManager().applyRules( |
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166 | sessions); |
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167 | |
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168 | return taskFactory.createTaskModel(sessions); |
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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 | * handles a single event that occurred in a user session. |
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174 | * </p> |
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175 | * |
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176 | * @param event |
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177 | * the event to handle |
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178 | */ |
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179 | public void handleNewEvent(Event event) { |
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180 | assertSessionSequence(); |
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181 | final String description = event.getType().getName() + " \u21D2 " |
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182 | + event.getTarget(); |
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183 | final IEventTask eventTask = taskFactory |
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184 | .createNewEventTask(description); |
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185 | taskBuilder.addExecutedTask(currentSession, |
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186 | taskFactory.createNewTaskInstance(eventTask, event)); |
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187 | } |
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188 | |
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189 | } |
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