1 | package de.ugoe.cs.quest.tasktrees.nodeequality; |
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2 | |
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3 | import java.util.ArrayList; |
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4 | import java.util.List; |
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5 | |
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6 | import de.ugoe.cs.quest.tasktrees.treeifc.ITaskTreeNode; |
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7 | |
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8 | /** |
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9 | * <p> |
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10 | * The node equality rule manager is capable of comparing task tree nodes based on its internal list |
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11 | * of comparison rules. The current list of rules contains the {@link NodeIdentityRule}, the |
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12 | * {@link IterationComparisonRule}, the {@link SequenceComparisonRule}, and |
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13 | * {@link SelectionComparisonRule}. These rules are asked for comparing the two provided task tree |
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14 | * nodes in the mentioned order. If a rule returns a node equality other than null, this equality is |
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15 | * returned. Otherwise the next rule is asked. |
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16 | * </p> |
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17 | * |
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18 | * @version $Revision: $ $Date: 19.02.2012$ |
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19 | * @author 2012, last modified by $Author: patrick$ |
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20 | */ |
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21 | public class NodeEqualityRuleManager { |
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22 | |
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23 | /** */ |
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24 | private List<NodeComparisonRule> mRuleIndex = null; |
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25 | |
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26 | /** |
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27 | * <p> |
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28 | * initializes the node equality rule manager by filling the internal list of comparison rules. |
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29 | * This method must be called before any other method is called on the rule manager. |
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30 | * </p> |
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31 | */ |
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32 | public void init() { |
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33 | mRuleIndex = new ArrayList<NodeComparisonRule>(); |
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34 | mRuleIndex.add(new NodeIdentityRule()); |
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35 | mRuleIndex.add(new GUIEventTaskComparisonRule()); |
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36 | mRuleIndex.add(new EventTaskComparisonRule()); |
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37 | mRuleIndex.add(new IterationComparisonRule(this)); |
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38 | mRuleIndex.add(new SequenceComparisonRule(this)); |
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39 | mRuleIndex.add(new SelectionComparisonRule(this)); |
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40 | mRuleIndex.add(new NodeAndIterationComparisonRule(this)); |
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41 | mRuleIndex.add(new NodeAndSelectionComparisonRule(this)); |
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42 | } |
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43 | |
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44 | /** |
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45 | * <p> |
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46 | * this method performs a comparison of the two provided task tree nodes. It iterates its |
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47 | * internal comparison rules. If the first rule returns a node equality other than null, |
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48 | * this equality is returned. Otherwise the next rule is tried. If no rule returns an equality |
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49 | * <code>NodeEquality.UNEQUAL</code> is returned. |
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50 | * </p> |
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51 | * |
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52 | * @param node1 the first task tree node to be compared |
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53 | * @param node2 the second task tree node to be compared |
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54 | * |
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55 | * @return as described |
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56 | * |
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57 | * @throws IllegalStateException in the case, the {@link #init()} method was not called on the |
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58 | * manager before a call to this method. |
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59 | */ |
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60 | public NodeEquality applyRules(ITaskTreeNode node1, ITaskTreeNode node2) |
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61 | throws IllegalStateException |
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62 | { |
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63 | if (mRuleIndex == null) { |
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64 | throw new IllegalStateException("not initialized"); |
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65 | } |
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66 | |
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67 | // LOG.info("checking for equality of " + node1 + " and " + node2); |
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68 | NodeEquality nodeEquality = null; |
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69 | |
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70 | for (NodeComparisonRule rule : mRuleIndex) { |
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71 | nodeEquality = rule.compare(node1, node2); |
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72 | |
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73 | if (nodeEquality != null) { |
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74 | // LOG.warning("used rule " + rule + " for equality check"); |
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75 | return nodeEquality; |
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76 | } |
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77 | } |
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78 | |
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79 | // LOG.warning("no rule could be applied --> handling nodes as unequal"); |
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80 | |
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81 | return NodeEquality.UNEQUAL; |
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82 | } |
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83 | |
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84 | } |
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