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.nodeequality; |
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16 | |
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17 | import java.util.List; |
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18 | |
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19 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IIteration; |
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20 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskTreeNode; |
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21 | |
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22 | /** |
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23 | * <p> |
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24 | * This class is capable of comparing any task tree node which is not an iteration with an |
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25 | * iteration. This is needed, because iterations may iterate exactly that node. In this |
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26 | * case, the iteration would be equal to that node if it was executed exactly once. The rule |
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27 | * returns lexically equal, it the child of the iteration is lexically equal to the node |
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28 | * or if the child of the iteration is a selection and this selections contains a lexically equal |
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29 | * node. The same applies for syntactical and semantical equality. |
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30 | * </p> |
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31 | |
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32 | * @author Patrick Harms |
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33 | */ |
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34 | public class NodeAndIterationComparisonRule implements NodeComparisonRule { |
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35 | |
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36 | /** the rule manager for internally comparing task tree nodes */ |
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37 | private NodeEqualityRuleManager mRuleManager; |
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38 | |
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39 | /** |
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40 | * <p> |
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41 | * simple constructor to provide the rule with the node equality rule manager to be able |
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42 | * to perform comparisons of the children of provided task tree nodes |
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43 | * </p> |
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44 | * |
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45 | * @param ruleManager the rule manager for comparing task tree nodes |
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46 | */ |
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47 | NodeAndIterationComparisonRule(NodeEqualityRuleManager ruleManager) { |
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48 | super(); |
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49 | mRuleManager = ruleManager; |
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50 | } |
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51 | |
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52 | /* (non-Javadoc) |
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53 | * @see NodeComparisonRule#isApplicable(ITaskTreeNode, ITaskTreeNode) |
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54 | */ |
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55 | @Override |
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56 | public boolean isApplicable(ITaskTreeNode node1, ITaskTreeNode node2) { |
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57 | return ((node1 instanceof IIteration) && (!(node2 instanceof IIteration))) || |
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58 | ((node2 instanceof IIteration) && (!(node1 instanceof IIteration))); |
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59 | } |
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60 | |
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61 | /* (non-Javadoc) |
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62 | * @see NodeComparisonRule#areLexicallyEqual(ITaskTreeNode, ITaskTreeNode) |
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63 | */ |
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64 | @Override |
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65 | public boolean areLexicallyEqual(ITaskTreeNode node1, ITaskTreeNode node2) { |
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66 | NodeEquality equality = getEquality(node1, node2, NodeEquality.LEXICALLY_EQUAL); |
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67 | return (equality != null) && (equality.isAtLeast(NodeEquality.LEXICALLY_EQUAL)); |
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68 | } |
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69 | |
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70 | /* (non-Javadoc) |
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71 | * @see NodeComparisonRule#areSyntacticallyEqual(ITaskTreeNode, ITaskTreeNode) |
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72 | */ |
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73 | @Override |
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74 | public boolean areSyntacticallyEqual(ITaskTreeNode node1, ITaskTreeNode node2) { |
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75 | NodeEquality equality = getEquality(node1, node2, NodeEquality.SYNTACTICALLY_EQUAL); |
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76 | return (equality != null) && (equality.isAtLeast(NodeEquality.SYNTACTICALLY_EQUAL)); |
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77 | } |
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78 | |
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79 | /* (non-Javadoc) |
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80 | * @see NodeComparisonRule#areSemanticallyEqual(ITaskTreeNode, ITaskTreeNode) |
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81 | */ |
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82 | @Override |
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83 | public boolean areSemanticallyEqual(ITaskTreeNode node1, ITaskTreeNode node2) { |
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84 | NodeEquality equality = getEquality(node1, node2, NodeEquality.SEMANTICALLY_EQUAL); |
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85 | return (equality != null) && (equality.isAtLeast(NodeEquality.SEMANTICALLY_EQUAL)); |
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86 | } |
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87 | |
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88 | /* (non-Javadoc) |
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89 | * @see NodeComparisonRule#compare(ITaskTreeNode, ITaskTreeNode) |
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90 | */ |
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91 | @Override |
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92 | public NodeEquality compare(ITaskTreeNode node1, ITaskTreeNode node2) { |
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93 | return getEquality(node1, node2, null); |
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94 | } |
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95 | |
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96 | /** |
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97 | * |
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98 | */ |
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99 | private NodeEquality getEquality(ITaskTreeNode node1, |
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100 | ITaskTreeNode node2, |
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101 | NodeEquality requiredEqualityLevel) |
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102 | { |
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103 | IIteration iteration = null; |
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104 | ITaskTreeNode node = null; |
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105 | |
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106 | if (node1 instanceof IIteration) { |
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107 | if (node2 instanceof IIteration) { |
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108 | // the rule is not responsible for two iterations |
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109 | return null; |
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110 | } |
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111 | |
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112 | iteration = (IIteration) node1; |
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113 | node = node2; |
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114 | } |
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115 | else if (node2 instanceof IIteration) { |
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116 | if (node1 instanceof IIteration) { |
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117 | // the rule is not responsible for two iterations |
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118 | return null; |
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119 | } |
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120 | |
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121 | iteration = (IIteration) node2; |
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122 | node = node1; |
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123 | } |
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124 | else { |
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125 | return null; |
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126 | } |
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127 | |
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128 | List<ITaskTreeNode> children = iteration.getChildren(); |
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129 | |
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130 | // now, that we found the iteration and the node, lets compare the child of the iteration |
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131 | // with the node. |
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132 | if (children.size() < 1) { |
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133 | return null; |
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134 | } |
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135 | |
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136 | NodeEquality nodeEquality = callRuleManager(children.get(0), node, requiredEqualityLevel); |
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137 | |
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138 | // although the subtask may be identical to the node, we can not return identical, as |
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139 | // the iteration is not identical to the node, but at most lexically equal |
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140 | if (nodeEquality == NodeEquality.IDENTICAL) { |
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141 | return NodeEquality.LEXICALLY_EQUAL; |
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142 | } |
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143 | else { |
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144 | return nodeEquality; |
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145 | } |
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146 | |
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147 | } |
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148 | |
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149 | /** |
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150 | * <p> |
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151 | * TODO: comment |
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152 | * </p> |
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153 | * |
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154 | * @param child1 |
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155 | * @param child2 |
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156 | * @param requiredEqualityLevel |
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157 | * @return |
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158 | */ |
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159 | private NodeEquality callRuleManager(ITaskTreeNode child1, |
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160 | ITaskTreeNode child2, |
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161 | NodeEquality requiredEqualityLevel) |
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162 | { |
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163 | if (requiredEqualityLevel == null) { |
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164 | return mRuleManager.compare(child1, child2); |
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165 | } |
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166 | else if (mRuleManager.areAtLeastEqual(child1, child2, requiredEqualityLevel)) { |
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167 | return requiredEqualityLevel; |
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168 | } |
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169 | else { |
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170 | return NodeEquality.UNEQUAL; |
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171 | } |
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172 | } |
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173 | } |
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