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.ISelectionInstance; |
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21 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask; |
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22 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
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23 | |
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24 | /** |
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25 | * <p> |
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26 | * this task comparison rule is capable of comparing selections. If both selections do not have |
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27 | * children, they are treated as lexically equal. If they have children, each child of both |
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28 | * selections is compared to each child of the respective other selection. The resulting equality |
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29 | * is the most concrete one of all these comparisons. I.e. if all children are at least lexically |
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30 | * equal, then the selections are lexically equal. If all children are at least syntactically |
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31 | * equal, then the selections are syntactically equal. If all children are at least semantically |
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32 | * equal, then the selections are semantically equal. If only one of the selections has children, |
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33 | * then the selections are unequal. The comparison is broken up, if only a specific equality is |
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34 | * checked for and this equality is ensured. |
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35 | * </p> |
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36 | * |
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37 | * @version $Revision: $ $Date: 19.02.2012$ |
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38 | * @author 2012, last modified by $Author: patrick$ |
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39 | */ |
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40 | public class SelectionComparisonRule implements TaskComparisonRule { |
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41 | |
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42 | /* (non-Javadoc) |
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43 | * @see TaskComparisonRule#isApplicable(ITask, ITask) |
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44 | */ |
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45 | @Override |
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46 | public boolean isApplicable(ITask task1, ITask task2) { |
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47 | return (task1 instanceof ISelection) && (task2 instanceof ISelection); |
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48 | } |
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49 | |
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50 | /* (non-Javadoc) |
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51 | * @see TaskComparisonRule#areLexicallyEqual(ITask, ITask) |
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52 | */ |
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53 | @Override |
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54 | public boolean areLexicallyEqual(ITask task1, ITask task2) { |
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55 | TaskEquality equality = getEquality(task1, task2, TaskEquality.LEXICALLY_EQUAL); |
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56 | return (equality != null) && (equality.isAtLeast(TaskEquality.LEXICALLY_EQUAL)); |
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57 | } |
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58 | |
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59 | /* (non-Javadoc) |
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60 | * @see TaskComparisonRule#areSyntacticallyEqual(ITask, ITask) |
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61 | */ |
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62 | @Override |
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63 | public boolean areSyntacticallyEqual(ITask task1, ITask task2) { |
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64 | TaskEquality equality = getEquality(task1, task2, TaskEquality.SYNTACTICALLY_EQUAL); |
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65 | return (equality != null) && (equality.isAtLeast(TaskEquality.SYNTACTICALLY_EQUAL)); |
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66 | } |
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67 | |
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68 | /* (non-Javadoc) |
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69 | * @see TaskComparisonRule#areSemanticallyEqual(ITask, ITask) |
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70 | */ |
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71 | @Override |
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72 | public boolean areSemanticallyEqual(ITask task1, ITask task2) { |
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73 | TaskEquality equality = getEquality(task1, task2, TaskEquality.SEMANTICALLY_EQUAL); |
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74 | return (equality != null) && (equality.isAtLeast(TaskEquality.SEMANTICALLY_EQUAL)); |
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75 | } |
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76 | |
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77 | /* (non-Javadoc) |
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78 | * @see TaskComparisonRule#compare(ITask, ITask) |
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79 | */ |
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80 | @Override |
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81 | public TaskEquality compare(ITask task1, ITask task2) { |
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82 | return getEquality(task1, task2, null); |
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83 | } |
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84 | |
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85 | /* (non-Javadoc) |
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86 | * @see TaskComparisonRule#isApplicable(ITaskInstance, ITaskInstance) |
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87 | */ |
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88 | @Override |
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89 | public boolean isApplicable(ITaskInstance instance1, ITaskInstance instance2) { |
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90 | return isApplicable(instance1.getTask(), instance2.getTask()); |
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91 | } |
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92 | |
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93 | /* (non-Javadoc) |
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94 | * @see TaskComparisonRule#areLexicallyEqual(ITaskInstance, ITaskInstance) |
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95 | */ |
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96 | @Override |
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97 | public boolean areLexicallyEqual(ITaskInstance instance1, ITaskInstance instance2) { |
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98 | TaskEquality equality = getEquality(instance1, instance2, TaskEquality.LEXICALLY_EQUAL); |
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99 | return (equality != null) && (equality.isAtLeast(TaskEquality.LEXICALLY_EQUAL)); |
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100 | } |
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101 | |
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102 | /* (non-Javadoc) |
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103 | * @see TaskComparisonRule#areSyntacticallyEqual(ITaskInstance, ITaskInstance) |
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104 | */ |
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105 | @Override |
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106 | public boolean areSyntacticallyEqual(ITaskInstance instance1, ITaskInstance instance2) { |
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107 | TaskEquality equality = getEquality(instance1, instance2, TaskEquality.SYNTACTICALLY_EQUAL); |
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108 | return (equality != null) && (equality.isAtLeast(TaskEquality.SYNTACTICALLY_EQUAL)); |
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109 | } |
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110 | |
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111 | /* (non-Javadoc) |
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112 | * @see TaskComparisonRule#areSemanticallyEqual(ITaskInstance, ITaskInstance) |
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113 | */ |
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114 | @Override |
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115 | public boolean areSemanticallyEqual(ITaskInstance instance1, ITaskInstance instance2) { |
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116 | TaskEquality equality = getEquality(instance1, instance2, TaskEquality.SEMANTICALLY_EQUAL); |
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117 | return (equality != null) && (equality.isAtLeast(TaskEquality.SEMANTICALLY_EQUAL)); |
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118 | } |
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119 | |
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120 | /* (non-Javadoc) |
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121 | * @see TaskComparisonRule#compare(ITaskInstance, ITaskInstance) |
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122 | */ |
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123 | @Override |
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124 | public TaskEquality compare(ITaskInstance instance1, ITaskInstance instance2) { |
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125 | return getEquality(instance1, instance2, null); |
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126 | } |
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127 | |
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128 | /** |
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129 | * <p> |
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130 | * compares two selections with each other checking for the provided required level of |
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131 | * equality. If this level is ensured, the method immediately returns. The more concrete |
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132 | * the required equality level, the more checks this method performs. |
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133 | * </p> |
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134 | * |
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135 | * @param task1 the first task to be compared |
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136 | * @param task2 the second task to be compared |
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137 | * @param requiredEqualityLevel the equality level to be checked for |
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138 | * |
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139 | * @return the determined equality. |
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140 | */ |
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141 | private TaskEquality getEquality(ITask task1, ITask task2, TaskEquality requiredEqualityLevel) { |
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142 | List<ITask> children1 = ((ISelection) task1).getChildren(); |
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143 | List<ITask> children2 = ((ISelection) task2).getChildren(); |
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144 | |
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145 | // if both selections do not have children, they are lexically equal. If only one of them |
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146 | // has children, they are unequal. |
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147 | if ((children1.size() == 0) && (children2.size() == 0)) { |
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148 | return TaskEquality.LEXICALLY_EQUAL; |
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149 | } |
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150 | else if ((children1.size() == 0) || (children2.size() == 0)) { |
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151 | return TaskEquality.UNEQUAL; |
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152 | } |
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153 | |
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154 | if (requiredEqualityLevel == null) { |
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155 | // calculate the common equality level for all children of both selections. |
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156 | // do it in both directions to ensure commutative comparison |
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157 | return getMostConcreteEqualityLevel(children1, children2); |
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158 | } |
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159 | else { |
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160 | // we are searching for a specific equality |
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161 | if (checkEqualityLevel(children1, children2, requiredEqualityLevel)) { |
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162 | return requiredEqualityLevel; |
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163 | } |
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164 | else { |
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165 | return TaskEquality.UNEQUAL; |
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166 | } |
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167 | } |
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168 | } |
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169 | |
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170 | /** |
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171 | * <p> |
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172 | * determines the most concrete equality level for all tasks in the first list compared to all |
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173 | * tasks in the second list. It is sufficient, if there is one task in one list for which there |
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174 | * exist an equal task in the other list. |
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175 | * </p> |
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176 | * |
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177 | * @param children1 the first list to be compared |
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178 | * @param children2 the second list to be compared |
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179 | * |
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180 | * @return the most concrete task equality identified for all tasks in the first list with |
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181 | * respect to the second list |
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182 | */ |
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183 | private TaskEquality getMostConcreteEqualityLevel(List<ITask> children1, List<ITask> children2) |
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184 | { |
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185 | TaskEquality childEquality; |
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186 | TaskEquality currentEquality; |
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187 | for (ITask child1 : children1) { |
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188 | childEquality = null; |
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189 | for (ITask child2 : children2) { |
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190 | currentEquality = callRuleManager(child1, child2, null); |
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191 | if ((currentEquality != null) && (currentEquality != TaskEquality.UNEQUAL)) { |
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192 | if (childEquality == null) { |
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193 | childEquality = currentEquality; |
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194 | } |
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195 | else { |
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196 | childEquality = childEquality.getCommonDenominator(currentEquality); |
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197 | } |
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198 | |
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199 | if (childEquality.isAtLeast(TaskEquality.LEXICALLY_EQUAL)) { |
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200 | // as we calculate the most concrete equality, we can break up here |
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201 | return TaskEquality.LEXICALLY_EQUAL; |
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202 | } |
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203 | } |
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204 | } |
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205 | } |
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206 | |
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207 | // as the comparison should be commutative, we do not need to check, if in list 2 there is |
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208 | // a child equal to one in list 1 |
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209 | return TaskEquality.UNEQUAL; |
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210 | } |
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211 | |
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212 | /** |
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213 | * <p> |
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214 | * ensures for the two given lists, that for at least one task in the first list there is a task |
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215 | * in the second list being on the given level equal to the task in the first list. |
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216 | * </p> |
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217 | * |
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218 | * @param children1 the first list to be compared |
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219 | * @param children2 the second list to be compared |
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220 | * @param requiredEqualityLevel the equality level to be checked for |
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221 | * |
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222 | * @return true if there is a task in the first list that has an equal task in the second list |
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223 | * when considering the given equality level, false else. |
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224 | */ |
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225 | private boolean checkEqualityLevel(List<ITask> children1, |
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226 | List<ITask> children2, |
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227 | TaskEquality requiredEqualityLevel) |
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228 | { |
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229 | TaskEquality currentEquality; |
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230 | for (ITask child1 : children1) { |
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231 | for (ITask child2 : children2) { |
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232 | currentEquality = callRuleManager(child1, child2, requiredEqualityLevel); |
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233 | if ((currentEquality != null) && (currentEquality.isAtLeast(requiredEqualityLevel))) |
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234 | { |
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235 | // we found at least one equal child with sufficient equality in the |
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236 | // second list. So be can break up for this child. |
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237 | return true; |
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238 | } |
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239 | } |
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240 | } |
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241 | |
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242 | return false; |
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243 | } |
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244 | |
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245 | /** |
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246 | * <p> |
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247 | * used to to call the task equality rule manager for the comparison of the two provided |
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248 | * children. If no required equality level is provided, than the most concrete equality is |
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249 | * returned. Otherwise, the required equality is returned as long as the children are equal |
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250 | * on that level. |
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251 | * </p> |
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252 | * |
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253 | * @param child1 the first task to be compared |
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254 | * @param child2 the second task to be compared |
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255 | * @param requiredEqualityLevel the equality level to be checked for |
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256 | * |
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257 | * @return the determined equality |
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258 | */ |
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259 | private TaskEquality callRuleManager(ITask child1, |
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260 | ITask child2, |
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261 | TaskEquality requiredEqualityLevel) |
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262 | { |
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263 | if (requiredEqualityLevel == null) { |
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264 | return TaskEqualityRuleManager.getInstance().compare(child1, child2); |
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265 | } |
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266 | else if (TaskEqualityRuleManager.getInstance().areAtLeastEqual |
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267 | (child1, child2, requiredEqualityLevel)) |
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268 | { |
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269 | return requiredEqualityLevel; |
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270 | } |
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271 | else { |
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272 | return TaskEquality.UNEQUAL; |
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273 | } |
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274 | } |
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275 | |
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276 | /** |
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277 | * <p> |
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278 | * compares two selection instances with each other checking for the provided required level of |
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279 | * equality. If this level is ensured, the method immediately returns. The more concrete |
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280 | * the required equality level, the more checks this method performs. |
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281 | * </p> |
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282 | * |
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283 | * @param taskInstance1 the first task instance to be compared |
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284 | * @param taskInstance2 the second task instance to be compared |
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285 | * @param requiredEqualityLevel the equality level to be checked for |
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286 | * |
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287 | * @return the determined equality. |
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288 | */ |
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289 | private TaskEquality getEquality(ITaskInstance taskInstance1, |
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290 | ITaskInstance taskInstance2, |
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291 | TaskEquality requiredEqualityLevel) |
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292 | { |
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293 | ITaskInstance child1 = ((ISelectionInstance) taskInstance1).getChild(); |
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294 | ITaskInstance child2 = ((ISelectionInstance) taskInstance2).getChild(); |
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295 | |
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296 | // if both selections do not have children, they are lexically equal. If only one of them |
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297 | // has children, they are unequal. |
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298 | if ((child1 == null) && (child2 == null)) { |
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299 | return TaskEquality.LEXICALLY_EQUAL; |
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300 | } |
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301 | else if ((child1 == null) || (child2 == null)) { |
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302 | return TaskEquality.UNEQUAL; |
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303 | } |
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304 | |
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305 | TaskEquality equality = callRuleManager(child1, child2, requiredEqualityLevel); |
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306 | |
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307 | if (equality == TaskEquality.IDENTICAL) { |
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308 | // two different selection instances can be at most lexically equal even if their |
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309 | // children are identical |
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310 | return TaskEquality.LEXICALLY_EQUAL; |
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311 | } |
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312 | else { |
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313 | return equality; |
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314 | } |
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315 | } |
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316 | |
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317 | /** |
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318 | * <p> |
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319 | * used to to call the task equality rule manager for the comparison of the two provided |
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320 | * children. If no required equality level is provided, than the most concrete equality is |
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321 | * returned. Otherwise, the required equality is returned as long as the children are equal |
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322 | * on that level. |
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323 | * </p> |
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324 | * |
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325 | * @param taskInstance1 the first task instance to be compared |
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326 | * @param taskInstance2 the second task instance to be compared |
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327 | * @param requiredEqualityLevel the equality level to be checked for |
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328 | * |
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329 | * @return the determined equality |
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330 | */ |
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331 | private TaskEquality callRuleManager(ITaskInstance taskInstance1, |
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332 | ITaskInstance taskInstance2, |
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333 | TaskEquality requiredEqualityLevel) |
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334 | { |
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335 | if (requiredEqualityLevel == null) { |
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336 | return TaskEqualityRuleManager.getInstance().compare(taskInstance1, taskInstance2); |
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337 | } |
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338 | else if (TaskEqualityRuleManager.getInstance().areAtLeastEqual |
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339 | (taskInstance1, taskInstance2, requiredEqualityLevel)) |
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340 | { |
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341 | return requiredEqualityLevel; |
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342 | } |
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343 | else { |
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344 | return TaskEquality.UNEQUAL; |
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345 | } |
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346 | } |
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347 | } |
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