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.treeimpl; |
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16 | |
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17 | import java.util.Collections; |
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18 | import java.util.Iterator; |
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19 | import java.util.LinkedList; |
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20 | import java.util.List; |
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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 | |
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25 | /** |
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26 | * <p> |
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27 | * this is the default implementation of the interface {@link IUserSession}. It |
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28 | * does not do anything fancy except implementing the interface. |
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29 | * </p> |
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30 | * |
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31 | * @author Patrick Harms |
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32 | */ |
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33 | class UserSession implements IUserSession { |
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34 | |
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35 | /** |
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36 | * <p> |
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37 | * default serial version UID |
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38 | * </p> |
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39 | */ |
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40 | private static final long serialVersionUID = 1L; |
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41 | |
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42 | /** |
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43 | * <p> |
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44 | * the task instances belonging to the user session |
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45 | * </p> |
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46 | */ |
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47 | private List<ITaskInstance> executedTasks = new LinkedList<ITaskInstance>(); |
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48 | |
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49 | /* (non-Javadoc) |
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50 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstanceList#get(int) |
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51 | */ |
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52 | @Override |
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53 | public ITaskInstance get(int index) { |
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54 | return executedTasks.get(index); |
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55 | } |
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56 | |
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57 | /* (non-Javadoc) |
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58 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstanceList#size() |
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59 | */ |
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60 | @Override |
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61 | public int size() { |
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62 | return executedTasks.size(); |
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63 | } |
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64 | |
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65 | /* (non-Javadoc) |
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66 | * @see java.lang.Iterable#iterator() |
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67 | */ |
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68 | @Override |
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69 | public Iterator<ITaskInstance> iterator() { |
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70 | return executedTasks.iterator(); |
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71 | } |
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72 | |
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73 | /* (non-Javadoc) |
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74 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.IUserSession#getExecutedTasks() |
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75 | */ |
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76 | @Override |
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77 | public List<ITaskInstance> getExecutedTasks() { |
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78 | return Collections.unmodifiableList(executedTasks); |
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79 | } |
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80 | |
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81 | /* (non-Javadoc) |
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82 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.IUserSession#equals(IUserSession) |
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83 | */ |
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84 | @Override |
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85 | public boolean equals(IUserSession userSession) { |
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86 | // task instances are only equal if they are identical or if they have the same id |
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87 | // (may happen, if they are cloned) |
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88 | return (this == userSession) || (this.hashCode() == userSession.hashCode()); |
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89 | } |
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90 | |
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91 | /* (non-Javadoc) |
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92 | * @see java.lang.Object#hashCode() |
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93 | */ |
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94 | @Override |
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95 | public synchronized int hashCode() { |
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96 | return super.hashCode(); |
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97 | } |
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98 | |
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99 | /* (non-Javadoc) |
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100 | * @see java.lang.Object#toString() |
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101 | */ |
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102 | @Override |
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103 | public synchronized String toString() { |
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104 | return "session (" + executedTasks.size() + " task instances)"; |
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105 | } |
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106 | |
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107 | /* (non-Javadoc) |
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108 | * @see java.lang.Object#clone() |
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109 | */ |
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110 | @Override |
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111 | public synchronized IUserSession clone() { |
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112 | UserSession clone = null; |
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113 | try { |
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114 | clone = (UserSession) super.clone(); |
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115 | |
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116 | clone.executedTasks = new LinkedList<ITaskInstance>(); |
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117 | |
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118 | for (ITaskInstance child : executedTasks) { |
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119 | clone.executedTasks.add(child.clone()); |
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120 | } |
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121 | |
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122 | } |
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123 | catch (CloneNotSupportedException e) { |
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124 | // this should never happen. Therefore simply dump the exception |
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125 | e.printStackTrace(); |
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126 | } |
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127 | |
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128 | return clone; |
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129 | } |
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130 | |
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131 | /** |
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132 | * <p> |
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133 | * used internally to add a task instance to the user session |
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134 | * </p> |
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135 | * |
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136 | * @param taskInstance the task instance to be added |
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137 | */ |
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138 | void addExecutedTask(ITaskInstance taskInstance) { |
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139 | executedTasks.add(taskInstance); |
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140 | } |
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141 | |
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142 | /** |
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143 | * <p> |
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144 | * used internally to add a task instance to the user session at a specific position |
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145 | * </p> |
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146 | * |
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147 | * @param index the index the task instance shall be added to |
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148 | * @param taskInstance the task instance to be added |
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149 | */ |
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150 | void addExecutedTask(int index, ITaskInstance taskInstance) { |
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151 | executedTasks.add(index, taskInstance); |
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152 | } |
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153 | |
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154 | /** |
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155 | * <p> |
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156 | * used internally to remove a task instance from the user session |
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157 | * </p> |
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158 | * |
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159 | * @param index the index of the task instance to be removed |
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160 | */ |
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161 | void removeExecutedTask(int index) { |
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162 | executedTasks.remove(index); |
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163 | } |
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164 | |
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165 | } |
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