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.temporalrelation; |
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16 | |
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17 | import java.util.HashMap; |
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18 | |
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19 | import de.ugoe.cs.autoquest.tasktrees.nodeequality.NodeEquality; |
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20 | import de.ugoe.cs.autoquest.tasktrees.nodeequality.NodeEqualityRuleManager; |
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21 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskTreeNode; |
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22 | import de.ugoe.cs.autoquest.usageprofiles.SymbolComparator; |
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23 | |
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24 | /** |
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25 | * <p> |
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26 | * TODO comment |
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27 | * </p> |
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28 | * |
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29 | * @author Patrick Harms |
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30 | */ |
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31 | public class TaskTreeNodeComparator implements SymbolComparator<ITaskTreeNode> { |
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32 | |
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33 | /** |
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34 | * <p> |
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35 | * the node equality manager needed for comparing task tree nodes with each other |
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36 | * </p> |
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37 | */ |
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38 | private NodeEqualityRuleManager nodeEqualityRuleManager; |
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39 | |
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40 | /** |
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41 | * <p> |
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42 | * the minimal node equality two identified sublists need to have to consider them as equal |
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43 | * and to create an iteration for |
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44 | * </p> |
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45 | */ |
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46 | private NodeEquality minimalNodeEquality; |
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47 | |
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48 | private Comparer comparer; |
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49 | |
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50 | private Comparer lexicalComparer; |
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51 | |
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52 | private StopWatch stopWatch = new StopWatch(); |
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53 | |
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54 | private HashMap<Long, Boolean> equalityBuffer = new HashMap<Long, Boolean>(); |
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55 | |
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56 | private HashMap<Long, Boolean> lexicalEqualityBuffer; |
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57 | |
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58 | /** |
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59 | * <p> |
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60 | * TODO: comment |
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61 | * </p> |
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62 | * |
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63 | * @param nodeEqualityRuleManager |
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64 | * @param minimalNodeEquality |
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65 | */ |
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66 | public TaskTreeNodeComparator(NodeEqualityRuleManager nodeEqualityRuleManager, |
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67 | NodeEquality minimalNodeEquality) |
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68 | { |
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69 | super(); |
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70 | this.nodeEqualityRuleManager = nodeEqualityRuleManager; |
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71 | this.minimalNodeEquality = minimalNodeEquality; |
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72 | |
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73 | if (minimalNodeEquality == NodeEquality.LEXICALLY_EQUAL) { |
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74 | comparer = new LexicalComparer(); |
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75 | } |
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76 | else if (minimalNodeEquality == NodeEquality.SYNTACTICALLY_EQUAL) { |
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77 | comparer = new SyntacticalComparer(); |
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78 | } |
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79 | else if (minimalNodeEquality == NodeEquality.SEMANTICALLY_EQUAL) { |
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80 | comparer = new SemanticalComparer(); |
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81 | } |
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82 | else { |
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83 | comparer = new DefaultComparer(); |
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84 | } |
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85 | |
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86 | if (minimalNodeEquality == NodeEquality.LEXICALLY_EQUAL) { |
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87 | lexicalComparer = comparer; |
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88 | lexicalEqualityBuffer = equalityBuffer; |
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89 | } |
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90 | else { |
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91 | lexicalComparer = new LexicalComparer(); |
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92 | lexicalEqualityBuffer = new HashMap<Long, Boolean>(); |
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93 | } |
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94 | } |
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95 | |
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96 | /* (non-Javadoc) |
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97 | * @see de.ugoe.cs.autoquest.tasktrees.temporalrelation.SymbolComparator#equals(java.lang.Object, java.lang.Object) |
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98 | */ |
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99 | @Override |
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100 | public boolean equals(ITaskTreeNode symbol1, ITaskTreeNode symbol2) { |
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101 | //String id = "compare " + symbol1.getClass().getSimpleName() + " " + |
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102 | // symbol2.getClass().getSimpleName(); |
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103 | //String id = "compare"; |
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104 | //stopWatch.start(id); |
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105 | |
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106 | Boolean result; |
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107 | |
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108 | if (symbol1 != symbol2) { |
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109 | long key = ((long) System.identityHashCode(symbol1)) << 32; |
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110 | key += System.identityHashCode(symbol2); |
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111 | |
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112 | result = equalityBuffer.get(key); |
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113 | |
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114 | if (result == null) { |
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115 | result = comparer.compare(symbol1, symbol2); |
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116 | equalityBuffer.put(key, result); |
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117 | } |
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118 | } |
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119 | else { |
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120 | result = true; |
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121 | } |
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122 | //stopWatch.stop(id); |
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123 | |
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124 | /*boolean result2 = nodeEqualityRuleManager.areAtLeastEqual(symbol1, symbol2, minimalNodeEquality); |
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125 | if (result != result2) { |
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126 | throw new IllegalStateException("implementation error"); |
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127 | }*/ |
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128 | |
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129 | return result; |
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130 | } |
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131 | |
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132 | /** |
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133 | * <p> |
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134 | * TODO: comment |
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135 | * </p> |
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136 | * |
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137 | * @return |
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138 | */ |
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139 | StopWatch getStopWatch() { |
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140 | return stopWatch; |
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141 | } |
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142 | |
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143 | /** |
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144 | * <p> |
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145 | * TODO: comment |
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146 | * </p> |
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147 | * |
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148 | * @param node1 |
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149 | * @param node2 |
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150 | * @return |
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151 | */ |
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152 | boolean areLexicallyEqual(ITaskTreeNode symbol1, ITaskTreeNode symbol2) { |
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153 | Boolean result; |
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154 | |
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155 | if (symbol1 != symbol2) { |
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156 | long key = ((long) System.identityHashCode(symbol1)) << 32; |
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157 | key += System.identityHashCode(symbol2); |
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158 | |
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159 | result = lexicalEqualityBuffer.get(key); |
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160 | |
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161 | if (result == null) { |
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162 | result = lexicalComparer.compare(symbol1, symbol2); |
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163 | lexicalEqualityBuffer.put(key, result); |
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164 | } |
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165 | } |
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166 | else { |
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167 | result = true; |
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168 | } |
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169 | |
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170 | return result; |
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171 | } |
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172 | |
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173 | /** |
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174 | * <p> |
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175 | * TODO: comment |
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176 | * </p> |
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177 | * |
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178 | * @return |
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179 | */ |
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180 | NodeEquality getConsideredNodeEquality() { |
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181 | return minimalNodeEquality; |
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182 | } |
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183 | |
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184 | /** |
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185 | * |
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186 | */ |
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187 | private interface Comparer { |
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188 | /** |
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189 | * |
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190 | */ |
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191 | boolean compare(ITaskTreeNode node1, ITaskTreeNode node2); |
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192 | } |
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193 | |
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194 | /** |
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195 | * |
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196 | */ |
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197 | private class LexicalComparer implements Comparer { |
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198 | |
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199 | /** |
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200 | * |
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201 | */ |
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202 | public boolean compare(ITaskTreeNode node1, ITaskTreeNode node2) { |
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203 | return nodeEqualityRuleManager.areLexicallyEqual(node1, node2); |
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204 | } |
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205 | } |
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206 | |
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207 | /** |
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208 | * |
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209 | */ |
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210 | private class SyntacticalComparer implements Comparer { |
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211 | |
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212 | /** |
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213 | * |
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214 | */ |
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215 | public boolean compare(ITaskTreeNode node1, ITaskTreeNode node2) { |
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216 | return nodeEqualityRuleManager.areSyntacticallyEqual(node1, node2); |
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217 | } |
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218 | } |
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219 | |
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220 | /** |
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221 | * |
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222 | */ |
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223 | private class SemanticalComparer implements Comparer { |
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224 | |
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225 | /** |
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226 | * |
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227 | */ |
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228 | public boolean compare(ITaskTreeNode node1, ITaskTreeNode node2) { |
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229 | return nodeEqualityRuleManager.areSemanticallyEqual(node1, node2); |
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230 | } |
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231 | } |
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232 | |
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233 | /** |
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234 | * |
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235 | */ |
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236 | private class DefaultComparer implements Comparer { |
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237 | |
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238 | /** |
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239 | * |
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240 | */ |
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241 | public boolean compare(ITaskTreeNode node1, ITaskTreeNode node2) { |
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242 | return nodeEqualityRuleManager.areAtLeastEqual(node1, node2, minimalNodeEquality); |
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243 | } |
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244 | } |
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245 | } |
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