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.ISequence; |
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20 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequenceInstance; |
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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 rule is capable of comparing sequences. If both sequences do not have |
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27 | * children, they are treated as lexically equal. Sequences are lexically equal, |
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28 | * if they have the same number and order of lexically equal children. The rule |
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29 | * can not decide, if two sequences are syntactically or semantically equal. |
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30 | * </p> |
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31 | * |
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32 | * @version $Revision: $ $Date: 19.02.2012$ |
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33 | * @author 2012, last modified by $Author: patrick$ |
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34 | */ |
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35 | public class SequenceComparisonRule implements TaskComparisonRule { |
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36 | |
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37 | /* |
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38 | * (non-Javadoc) |
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39 | * |
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40 | * @see TaskComparisonRule#areLexicallyEqual(ITask, ITask) |
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41 | */ |
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42 | @Override |
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43 | public boolean areLexicallyEqual(ITask task1, ITask task2) { |
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44 | final TaskEquality equality = getEquality(task1, task2, |
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45 | TaskEquality.LEXICALLY_EQUAL); |
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46 | return (equality != null) |
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47 | && (equality.isAtLeast(TaskEquality.LEXICALLY_EQUAL)); |
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48 | } |
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49 | |
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50 | /* |
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51 | * (non-Javadoc) |
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52 | * |
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53 | * @see TaskComparisonRule#areLexicallyEqual(ITaskInstance, ITaskInstance) |
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54 | */ |
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55 | @Override |
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56 | public boolean areLexicallyEqual(ITaskInstance instance1, |
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57 | ITaskInstance instance2) { |
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58 | final TaskEquality equality = getEquality(instance1, instance2, |
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59 | TaskEquality.LEXICALLY_EQUAL); |
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60 | return (equality != null) |
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61 | && (equality.isAtLeast(TaskEquality.LEXICALLY_EQUAL)); |
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62 | } |
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63 | |
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64 | /* |
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65 | * (non-Javadoc) |
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66 | * |
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67 | * @see TaskComparisonRule#areSemanticallyEqual(ITask, ITask) |
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68 | */ |
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69 | @Override |
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70 | public boolean areSemanticallyEqual(ITask task1, ITask task2) { |
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71 | final TaskEquality equality = getEquality(task1, task2, |
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72 | TaskEquality.SEMANTICALLY_EQUAL); |
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73 | return (equality != null) |
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74 | && (equality.isAtLeast(TaskEquality.SEMANTICALLY_EQUAL)); |
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75 | } |
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76 | |
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77 | /* |
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78 | * (non-Javadoc) |
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79 | * |
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80 | * @see TaskComparisonRule#areSemanticallyEqual(ITaskInstance, |
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81 | * ITaskInstance) |
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82 | */ |
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83 | @Override |
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84 | public boolean areSemanticallyEqual(ITaskInstance instance1, |
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85 | ITaskInstance instance2) { |
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86 | final TaskEquality equality = getEquality(instance1, instance2, |
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87 | TaskEquality.SEMANTICALLY_EQUAL); |
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88 | return (equality != null) |
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89 | && (equality.isAtLeast(TaskEquality.SEMANTICALLY_EQUAL)); |
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90 | } |
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91 | |
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92 | /* |
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93 | * (non-Javadoc) |
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94 | * |
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95 | * @see TaskComparisonRule#areSyntacticallyEqual(ITask, ITask) |
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96 | */ |
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97 | @Override |
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98 | public boolean areSyntacticallyEqual(ITask task1, ITask task2) { |
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99 | final TaskEquality equality = getEquality(task1, task2, |
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100 | TaskEquality.SYNTACTICALLY_EQUAL); |
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101 | return (equality != null) |
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102 | && (equality.isAtLeast(TaskEquality.SYNTACTICALLY_EQUAL)); |
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103 | } |
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104 | |
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105 | /* |
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106 | * (non-Javadoc) |
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107 | * |
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108 | * @see TaskComparisonRule#areSyntacticallyEqual(ITaskInstance, |
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109 | * ITaskInstance) |
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110 | */ |
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111 | @Override |
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112 | public boolean areSyntacticallyEqual(ITaskInstance instance1, |
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113 | ITaskInstance instance2) { |
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114 | final TaskEquality equality = getEquality(instance1, instance2, |
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115 | TaskEquality.SYNTACTICALLY_EQUAL); |
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116 | return (equality != null) |
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117 | && (equality.isAtLeast(TaskEquality.SYNTACTICALLY_EQUAL)); |
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118 | } |
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119 | |
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120 | /** |
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121 | * <p> |
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122 | * used to to call the task equality rule manager for the comparison of the |
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123 | * two provided children. If no required equality level is provided, than |
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124 | * the most concrete equality is returned. Otherwise, the required equality |
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125 | * is returned as long as the children are equal on that level. |
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126 | * </p> |
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127 | * |
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128 | * @param child1 |
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129 | * the first task to be compared |
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130 | * @param child2 |
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131 | * the second task to be compared |
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132 | * @param requiredEqualityLevel |
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133 | * the equality level to be checked for |
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134 | * |
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135 | * @return the determined equality |
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136 | */ |
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137 | private TaskEquality callRuleManager(ITask child1, ITask child2, |
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138 | TaskEquality requiredEqualityLevel) { |
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139 | if (requiredEqualityLevel == null) { |
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140 | return TaskEqualityRuleManager.getInstance() |
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141 | .compare(child1, child2); |
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142 | } else if (TaskEqualityRuleManager.getInstance().areAtLeastEqual( |
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143 | child1, child2, requiredEqualityLevel)) { |
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144 | return requiredEqualityLevel; |
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145 | } else { |
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146 | return TaskEquality.UNEQUAL; |
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147 | } |
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148 | } |
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149 | |
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150 | /** |
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151 | * <p> |
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152 | * used to to call the task equality rule manager for the comparison of the |
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153 | * two provided children. If no required equality level is provided, than |
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154 | * the most concrete equality is returned. Otherwise, the required equality |
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155 | * is returned as long as the children are equal on that level. |
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156 | * </p> |
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157 | * |
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158 | * @param taskInstance1 |
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159 | * the first task instance to be compared |
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160 | * @param taskInstance2 |
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161 | * the second task instance to be compared |
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162 | * @param requiredEqualityLevel |
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163 | * the equality level to be checked for |
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164 | * |
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165 | * @return the determined equality |
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166 | */ |
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167 | private TaskEquality callRuleManager(ITaskInstance taskInstance1, |
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168 | ITaskInstance taskInstance2, TaskEquality requiredEqualityLevel) { |
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169 | if (requiredEqualityLevel == null) { |
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170 | return TaskEqualityRuleManager.getInstance().compare(taskInstance1, |
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171 | taskInstance2); |
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172 | } else if (TaskEqualityRuleManager.getInstance().areAtLeastEqual( |
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173 | taskInstance1, taskInstance2, requiredEqualityLevel)) { |
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174 | return requiredEqualityLevel; |
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175 | } else { |
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176 | return TaskEquality.UNEQUAL; |
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177 | } |
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178 | } |
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179 | |
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180 | /* |
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181 | * (non-Javadoc) |
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182 | * |
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183 | * @see TaskComparisonRule#compare(ITask, ITask) |
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184 | */ |
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185 | @Override |
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186 | public TaskEquality compare(ITask task1, ITask task2) { |
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187 | return getEquality(task1, task2, null); |
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188 | } |
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189 | |
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190 | /* |
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191 | * (non-Javadoc) |
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192 | * |
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193 | * @see TaskComparisonRule#compare(ITaskInstance, ITaskInstance) |
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194 | */ |
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195 | @Override |
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196 | public TaskEquality compare(ITaskInstance instance1, ITaskInstance instance2) { |
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197 | return getEquality(instance1, instance2, null); |
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198 | } |
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199 | |
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200 | /** |
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201 | * <p> |
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202 | * compares two sequences with each other checking for the provided required |
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203 | * level of equality. If this level is ensured, the method immediately |
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204 | * returns. The more concrete the required equality level, the more checks |
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205 | * this method performs. |
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206 | * </p> |
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207 | * |
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208 | * @param task1 |
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209 | * the first task to be compared |
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210 | * @param task2 |
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211 | * the second task to be compared |
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212 | * @param requiredEqualityLevel |
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213 | * the equality level to be checked for |
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214 | * |
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215 | * @return the determined equality. |
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216 | */ |
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217 | private TaskEquality getEquality(ITask task1, ITask task2, |
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218 | TaskEquality requiredEqualityLevel) { |
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219 | final List<ITask> children1 = ((ISequence) task1).getChildren(); |
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220 | final List<ITask> children2 = ((ISequence) task2).getChildren(); |
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221 | |
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222 | // if both sequences do not have children, they are equal although this |
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223 | // doesn't make sense |
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224 | if ((children1.size() == 0) && (children2.size() == 0)) { |
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225 | return TaskEquality.LEXICALLY_EQUAL; |
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226 | } |
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227 | |
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228 | if (children1.size() != children2.size()) { |
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229 | return TaskEquality.UNEQUAL; |
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230 | } |
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231 | |
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232 | TaskEquality resultingEquality = TaskEquality.LEXICALLY_EQUAL; |
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233 | for (int i = 0; i < children1.size(); i++) { |
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234 | final ITask child1 = children1.get(i); |
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235 | final ITask child2 = children2.get(i); |
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236 | |
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237 | final TaskEquality taskEquality = callRuleManager(child1, child2, |
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238 | requiredEqualityLevel); |
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239 | |
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240 | if ((taskEquality == null) |
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241 | || (taskEquality == TaskEquality.UNEQUAL)) { |
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242 | return TaskEquality.UNEQUAL; |
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243 | } |
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244 | |
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245 | resultingEquality = resultingEquality |
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246 | .getCommonDenominator(taskEquality); |
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247 | } |
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248 | |
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249 | return resultingEquality; |
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250 | } |
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251 | |
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252 | /** |
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253 | * <p> |
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254 | * compares two sequence instances with each other checking for the provided |
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255 | * required level of equality. If this level is ensured, the method |
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256 | * immediately returns. The more concrete the required equality level, the |
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257 | * more checks this method performs. |
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258 | * </p> |
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259 | * |
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260 | * @param taskInstance1 |
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261 | * the first task instance to be compared |
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262 | * @param taskInstance2 |
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263 | * the second task instance to be compared |
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264 | * @param requiredEqualityLevel |
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265 | * the equality level to be checked for |
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266 | * |
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267 | * @return the determined equality. |
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268 | */ |
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269 | private TaskEquality getEquality(ITaskInstance taskInstance1, |
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270 | ITaskInstance taskInstance2, TaskEquality requiredEqualityLevel) { |
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271 | final ISequenceInstance sequence1 = (ISequenceInstance) taskInstance1; |
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272 | final ISequenceInstance sequence2 = (ISequenceInstance) taskInstance2; |
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273 | |
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274 | // if both sequences do not have children, they are equal although this |
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275 | // doesn't make sense |
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276 | if ((sequence1.size() == 0) && (sequence2.size() == 0)) { |
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277 | return TaskEquality.LEXICALLY_EQUAL; |
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278 | } |
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279 | |
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280 | if (sequence1.size() != sequence2.size()) { |
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281 | return TaskEquality.UNEQUAL; |
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282 | } |
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283 | |
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284 | TaskEquality resultingEquality = TaskEquality.LEXICALLY_EQUAL; |
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285 | for (int i = 0; i < sequence1.size(); i++) { |
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286 | final ITaskInstance child1 = sequence1.get(i); |
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287 | final ITaskInstance child2 = sequence2.get(i); |
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288 | |
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289 | final TaskEquality taskEquality = callRuleManager(child1, child2, |
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290 | requiredEqualityLevel); |
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291 | |
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292 | if ((taskEquality == null) |
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293 | || (taskEquality == TaskEquality.UNEQUAL)) { |
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294 | return TaskEquality.UNEQUAL; |
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295 | } |
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296 | |
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297 | resultingEquality = resultingEquality |
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298 | .getCommonDenominator(taskEquality); |
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299 | } |
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300 | |
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301 | return resultingEquality; |
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302 | } |
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303 | |
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304 | /* |
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305 | * (non-Javadoc) |
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306 | * |
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307 | * @see TaskComparisonRule#isApplicable(ITask, ITask) |
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308 | */ |
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309 | @Override |
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310 | public boolean isApplicable(ITask task1, ITask task2) { |
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311 | return (task1 instanceof ISequence) && (task2 instanceof ISequence); |
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312 | } |
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313 | |
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314 | /* |
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315 | * (non-Javadoc) |
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316 | * |
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317 | * @see TaskComparisonRule#isApplicable(ITaskInstance, ITaskInstance) |
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318 | */ |
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319 | @Override |
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320 | public boolean isApplicable(ITaskInstance instance1, ITaskInstance instance2) { |
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321 | return isApplicable(instance1.getTask(), instance2.getTask()); |
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322 | } |
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323 | } |
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