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.ITask; |
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23 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
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24 |
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25 | /**
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26 | * TODO comment
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27 | *
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28 | * @version $Revision: $ $Date: $
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29 | * @author 2011, last modified by $Author: $
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30 | */
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31 | class TaskInstance implements ITaskInstance { |
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32 |
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33 | /** */ |
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34 | private static final long serialVersionUID = 1L; |
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35 | |
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36 | /** */
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37 | private static int temporalId = 0;
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38 | |
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39 | /** */ |
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40 | private ITask task; |
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41 |
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42 | /** */
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43 | private int id;
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44 |
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45 | /** children */
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46 | private List<ITaskInstance> children;
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47 |
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48 | /**
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49 | *
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50 | */
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51 | TaskInstance(ITask task) {
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52 | this.task = task;
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53 | id = getNewId();
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54 | }
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55 |
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56 | /**
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57 | * TODO: comment
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58 | *
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59 | * @return
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60 | */
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61 | private static synchronized int getNewId() {
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62 | if (temporalId == Integer.MAX_VALUE) {
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63 | temporalId = 0;
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64 | }
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65 |
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66 | return temporalId++;
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67 | }
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68 |
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69 | /* (non-Javadoc) |
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70 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance#getTask() |
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71 | */ |
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72 | @Override
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73 | public ITask getTask() {
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74 | return task;
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75 | }
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76 |
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77 | /* (non-Javadoc) |
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78 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance#getChildren() |
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79 | */ |
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80 | public synchronized List<ITaskInstance> getChildren() {
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81 | if (children == null) {
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82 | children = new LinkedList<ITaskInstance>();
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83 | }
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84 |
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85 | return Collections.unmodifiableList(children);
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86 | }
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87 |
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88 | /* (non-Javadoc) |
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89 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstanceList#get(int) |
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90 | */ |
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91 | @Override |
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92 | public ITaskInstance get(int index) { |
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93 | if (children == null) { |
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94 | throw new IndexOutOfBoundsException(Integer.toString(index)); |
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95 | } |
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96 | else { |
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97 | return children.get(index); |
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98 | } |
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99 | } |
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100 | |
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101 | /* (non-Javadoc) |
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102 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstanceList#size() |
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103 | */ |
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104 | @Override |
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105 | public int size() { |
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106 | if (children == null) { |
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107 | return 0; |
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108 | } |
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109 | else { |
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110 | return children.size(); |
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111 | } |
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112 | } |
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113 | |
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114 | /* (non-Javadoc) |
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115 | * @see java.lang.Iterable#iterator() |
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116 | */ |
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117 | @Override |
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118 | public Iterator<ITaskInstance> iterator() { |
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119 | return getChildren().iterator(); |
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120 | } |
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121 | |
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122 | /*
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123 | * (non-Javadoc)
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124 | *
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125 | * @see de.ugoe.cs.autoquest.tasktrees.treeifc.TaskTreeNode#equals(TaskTreeNode)
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126 | */
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127 | @Override
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128 | public boolean equals(ITaskInstance taskInstance) {
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129 | // task instances are only equal if they are identical or if they have the same id |
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130 | // (may happen, if they are cloned) |
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131 | return (this == taskInstance) || (this.hashCode() == taskInstance.hashCode()); |
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132 | }
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133 |
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134 | /*
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135 | * (non-Javadoc)
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136 | *
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137 | * @see java.lang.Object#hashCode()
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138 | */
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139 | @Override
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140 | public synchronized int hashCode() {
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141 | return id;
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142 | }
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143 |
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144 | /*
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145 | * (non-Javadoc)
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146 | *
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147 | * @see java.lang.Object#toString()
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148 | */
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149 | @Override
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150 | public synchronized String toString() { |
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151 | StringBuffer result = new StringBuffer(); |
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152 | result.append("task "); |
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153 | result.append(task.getId()); |
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154 | result.append(" (instance "); |
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155 | result.append(id); |
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156 | |
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157 | if (task.getDescription() != null) { |
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158 | result.append(", "); |
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159 | result.append(task.getDescription()); |
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160 | } |
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161 | |
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162 | if (children != null) { |
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163 | result.append(", "); |
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164 | result.append(children.size()); |
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165 | result.append(" children"); |
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166 | } |
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167 | |
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168 | result.append(')'); |
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169 | return result.toString();
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170 | }
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171 | |
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172 | /* |
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173 | * (non-Javadoc) |
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174 | * |
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175 | * @see java.lang.Object#clone() |
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176 | */ |
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177 | @Override |
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178 | public synchronized ITaskInstance clone() { |
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179 | TaskInstance clone = null; |
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180 | try { |
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181 | clone = (TaskInstance) super.clone(); |
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182 | |
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183 | if (children != null) { |
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184 | clone.children = new LinkedList<ITaskInstance>(); |
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185 | |
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186 | for (ITaskInstance child : children) { |
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187 | clone.children.add(child.clone()); |
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188 | } |
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189 | } |
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190 | |
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191 | } |
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192 | catch (CloneNotSupportedException e) { |
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193 | // this should never happen. Therefore simply dump the exception |
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194 | e.printStackTrace(); |
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195 | } |
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196 | |
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197 | return clone; |
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198 | } |
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199 |
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200 | /**
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201 | *
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202 | */
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203 | synchronized void addChild(ITaskInstance child) {
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204 | if (children == null) {
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205 | children = new LinkedList<ITaskInstance>();
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206 | }
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207 |
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208 | children.add(child);
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209 | }
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210 |
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211 | /**
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212 | *
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213 | */
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214 | synchronized void addChild(int index, ITaskInstance child) {
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215 | if (children == null) {
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216 | children = new LinkedList<ITaskInstance>();
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217 | }
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218 |
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219 | children.add(index, child);
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220 | }
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221 |
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222 | /**
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223 | * TODO: comment
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224 | *
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225 | * @param i
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226 | * @return
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227 | */
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228 | synchronized ITaskInstance removeChild(int index) {
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229 | if (children != null) { |
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230 | return children.remove(index); |
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231 | } |
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232 | else { |
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233 | throw new IllegalArgumentException |
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234 | ("this task instance does not have children that can be removed"); |
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235 | }
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236 | } |
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237 | |
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238 | /** |
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239 | * @param task the task to set |
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240 | */ |
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241 | void setTask(ITask task) { |
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242 | this.task = task; |
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243 | }
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244 |
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245 | }
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