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.taskequality; |
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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.ISelection; |
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20 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask; |
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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 which is not a selection with a |
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25 | * selection. This is needed, because selections may contain exactly that task. Therefore, if |
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26 | * this task is selected out of a selection the selection is equal to the task itself. |
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27 | * The rule returns lexically equal, if the selection contains a lexically equal task. The same |
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28 | * applies for syntactical and semantical equality. |
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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 | public class TaskAndSelectionComparisonRule implements TaskComparisonRule { |
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34 | |
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35 | /* (non-Javadoc) |
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36 | * @see NodeComparisonRule#isApplicable(ITask, ITask) |
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37 | */ |
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38 | @Override |
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39 | public boolean isApplicable(ITask task1, ITask task2) { |
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40 | return ((task1 instanceof ISelection) && (!(task2 instanceof ISelection))) || |
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41 | ((task2 instanceof ISelection) && (!(task1 instanceof ISelection))); |
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42 | } |
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43 | |
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44 | /* (non-Javadoc) |
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45 | * @see NodeComparisonRule#areLexicallyEqual(ITask, ITask) |
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46 | */ |
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47 | @Override |
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48 | public boolean areLexicallyEqual(ITask task1, ITask task2) { |
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49 | TaskEquality equality = getEquality(task1, task2, TaskEquality.LEXICALLY_EQUAL); |
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50 | return (equality != null) && (equality.isAtLeast(TaskEquality.LEXICALLY_EQUAL)); |
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51 | } |
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52 | |
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53 | /* (non-Javadoc) |
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54 | * @see NodeComparisonRule#areSyntacticallyEqual(ITask, ITask) |
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55 | */ |
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56 | @Override |
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57 | public boolean areSyntacticallyEqual(ITask task1, ITask task2) { |
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58 | TaskEquality equality = getEquality(task1, task2, TaskEquality.SYNTACTICALLY_EQUAL); |
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59 | return (equality != null) && (equality.isAtLeast(TaskEquality.SYNTACTICALLY_EQUAL)); |
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60 | } |
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61 | |
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62 | /* (non-Javadoc) |
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63 | * @see NodeComparisonRule#areSemanticallyEqual(ITask, ITask) |
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64 | */ |
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65 | @Override |
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66 | public boolean areSemanticallyEqual(ITask task1, ITask task2) { |
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67 | TaskEquality equality = getEquality(task1, task2, TaskEquality.SEMANTICALLY_EQUAL); |
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68 | return (equality != null) && (equality.isAtLeast(TaskEquality.SEMANTICALLY_EQUAL)); |
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69 | } |
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70 | |
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71 | /* (non-Javadoc) |
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72 | * @see NodeComparisonRule#compare(ITask, ITask) |
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73 | */ |
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74 | @Override |
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75 | public TaskEquality compare(ITask task1, ITask task2) { |
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76 | return getEquality(task1, task2, null); |
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77 | } |
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78 | |
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79 | /** |
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80 | * <p> |
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81 | * compares two tasks with each other checking for the provided required level of |
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82 | * equality. One of the tasks must be a selection, the other one not. If this is not the |
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83 | * case, the method returns null. The returned equality level is at most lexical equality |
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84 | * as the selection can not be identical to something not being a selection. |
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85 | * </p> |
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86 | * |
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87 | * @param task1 the first task to be compared |
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88 | * @param task2 the second task to be compared |
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89 | * @param requiredEqualityLevel the equality level to be checked for |
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90 | * |
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91 | * @return the determined equality. |
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92 | */ |
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93 | private TaskEquality getEquality(ITask task1, ITask task2, TaskEquality requiredEqualityLevel) { |
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94 | ISelection selection = null; |
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95 | ITask task = null; |
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96 | |
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97 | if (task1 instanceof ISelection) { |
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98 | if (task2 instanceof ISelection) { |
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99 | // the rule is not responsible for two selections |
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100 | return null; |
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101 | } |
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102 | |
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103 | selection = (ISelection) task1; |
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104 | task = task2; |
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105 | } |
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106 | else if (task2 instanceof ISelection) { |
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107 | if (task1 instanceof ISelection) { |
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108 | // the rule is not responsible for two selections |
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109 | return null; |
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110 | } |
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111 | |
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112 | selection = (ISelection) task2; |
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113 | task = task1; |
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114 | } |
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115 | else { |
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116 | return null; |
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117 | } |
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118 | |
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119 | // now, that we found the selection and the task, lets compare the children of the selection |
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120 | // with the task. |
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121 | List<ITask> children = selection.getChildren(); |
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122 | |
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123 | if (children.size() < 1) { |
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124 | return null; |
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125 | } |
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126 | |
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127 | TaskEquality mostConcreteNodeEquality = null; |
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128 | |
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129 | for (ITask child : children) { |
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130 | TaskEquality taskEquality = callRuleManager(child, task, requiredEqualityLevel); |
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131 | |
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132 | if (taskEquality != TaskEquality.UNEQUAL) { |
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133 | if (mostConcreteNodeEquality == null) { |
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134 | mostConcreteNodeEquality = taskEquality; |
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135 | } |
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136 | else if (mostConcreteNodeEquality.isAtLeast(taskEquality)) { |
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137 | mostConcreteNodeEquality = taskEquality; |
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138 | |
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139 | } |
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140 | |
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141 | if ((requiredEqualityLevel != null) && |
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142 | (mostConcreteNodeEquality.isAtLeast(requiredEqualityLevel))) |
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143 | { |
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144 | // if we found one child of the selection that is as equal as required, then |
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145 | // we can consider the selection to be sufficiently equal to the other task. |
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146 | // So we break up checking further children. |
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147 | break; |
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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 | // although the subtask may be identical to the task, we can not return identical, as |
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153 | // the selection is not identical to the task, but at most lexically equal |
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154 | if (mostConcreteNodeEquality == TaskEquality.IDENTICAL) { |
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155 | return TaskEquality.LEXICALLY_EQUAL; |
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156 | } |
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157 | else { |
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158 | return mostConcreteNodeEquality; |
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159 | } |
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160 | |
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161 | } |
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162 | |
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163 | /** |
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164 | * <p> |
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165 | * used to to call the task equality rule manager for the comparison of the two provided |
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166 | * children. If no required equality level is provided, than the most concrete equality is |
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167 | * returned. Otherwise, the required equality is returned as long as the children are equal |
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168 | * on that level. |
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169 | * </p> |
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170 | * |
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171 | * @param child1 the first task to be compared |
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172 | * @param child2 the second task to be compared |
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173 | * @param requiredEqualityLevel the equality level to be checked for |
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174 | * |
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175 | * @return the determined equality |
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176 | */ |
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177 | private TaskEquality callRuleManager(ITask child1, |
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178 | ITask child2, |
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179 | TaskEquality requiredEqualityLevel) |
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180 | { |
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181 | if (requiredEqualityLevel == null) { |
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182 | return TaskEqualityRuleManager.getInstance().compare(child1, child2); |
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183 | } |
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184 | else if (TaskEqualityRuleManager.getInstance().areAtLeastEqual |
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185 | (child1, child2, requiredEqualityLevel)) |
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186 | { |
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187 | return requiredEqualityLevel; |
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188 | } |
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189 | else { |
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190 | return TaskEquality.UNEQUAL; |
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191 | } |
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192 | } |
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193 | } |
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