1 | //------------------------------------------------------------------------------------------------- |
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2 | // Module : $RCSfile: NodeIdentityRule.java,v $ |
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3 | // Version : $Revision: 0.0 $ $Author: patrick $ $Date: 19.02.2012 $ |
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4 | // Project : TaskTreeCreator |
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5 | // Creation : 2012 by patrick |
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6 | // Copyright : Patrick Harms, 2012 |
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7 | //------------------------------------------------------------------------------------------------- |
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8 | package de.ugoe.cs.quest.tasktrees.nodeequality; |
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9 | |
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10 | import de.ugoe.cs.quest.tasktrees.treeifc.Sequence; |
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11 | import de.ugoe.cs.quest.tasktrees.treeifc.TaskTreeNode; |
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12 | |
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13 | //------------------------------------------------------------------------------------------------- |
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14 | /** |
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15 | * TODO comment |
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16 | * |
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17 | * @version $Revision: $ $Date: 19.02.2012$ |
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18 | * @author 2012, last modified by $Author: patrick$ |
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19 | */ |
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20 | //------------------------------------------------------------------------------------------------- |
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21 | public class SequenceComparisonRule implements NodeComparisonRule |
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22 | { |
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23 | |
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24 | |
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25 | /** */ |
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26 | private NodeEqualityRuleManager mRuleManager; |
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27 | |
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28 | //----------------------------------------------------------------------------------------------- |
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29 | /** |
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30 | * TODO: comment |
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31 | * |
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32 | */ |
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33 | //----------------------------------------------------------------------------------------------- |
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34 | SequenceComparisonRule(NodeEqualityRuleManager ruleManager) |
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35 | { |
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36 | super(); |
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37 | mRuleManager = ruleManager; |
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38 | } |
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39 | |
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40 | //----------------------------------------------------------------------------------------------- |
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41 | /* (non-Javadoc) |
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42 | * @see de.ugoe.cs.tasktree.nodeequality.NodeEqualityRule#apply(TaskTreeNode, TaskTreeNode) |
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43 | */ |
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44 | //----------------------------------------------------------------------------------------------- |
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45 | @Override |
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46 | public NodeEquality compare(TaskTreeNode node1, TaskTreeNode node2) |
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47 | { |
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48 | if ((!(node1 instanceof Sequence)) || (!(node2 instanceof Sequence))) |
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49 | { |
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50 | return null; |
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51 | } |
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52 | |
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53 | // if both sequences do not have children, they are equal although this doesn't make sense |
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54 | if ((node1.getChildren().size() == 0) && (node2.getChildren().size() == 0)) |
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55 | { |
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56 | return new NodesEqual(); |
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57 | } |
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58 | |
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59 | // Sequences are equal, if they have the same number and order of children. If all the |
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60 | // children match structurally, then the sequences are structurally equal. Otherwise, if |
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61 | // at least one pair of children matches only semantically, then the sequences match only |
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62 | // semantically. |
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63 | if (node1.getChildren().size() != node2.getChildren().size()) |
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64 | { |
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65 | return null; |
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66 | } |
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67 | |
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68 | boolean structurallyEqual = true; |
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69 | for (int i = 0; i < node1.getChildren().size(); i++) |
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70 | { |
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71 | TaskTreeNode child1 = node1.getChildren().get(i); |
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72 | TaskTreeNode child2 = node2.getChildren().get(i); |
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73 | |
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74 | NodeEquality nodeEquality = mRuleManager.applyRules(child1, child2); |
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75 | |
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76 | structurallyEqual &= nodeEquality.getStructuralEquality(); |
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77 | |
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78 | if (!structurallyEqual && !nodeEquality.getSemanticalEquality()) |
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79 | { |
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80 | return null; |
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81 | } |
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82 | } |
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83 | |
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84 | if (structurallyEqual) |
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85 | { |
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86 | return new NodesEqual(); |
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87 | } |
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88 | else |
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89 | { |
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90 | return new NodesSemanticallyEqual(); |
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91 | } |
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92 | } |
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93 | |
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94 | } |
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