1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using HeuristicLab.Common;
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23 | using HeuristicLab.Core;
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24 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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26 |
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27 | namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
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28 | [Item("SymbolicExpressionTreeNodeEqualityComparer", "An operator that checks node equality based on different similarity measures.")]
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29 | [StorableClass]
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30 | public class SymbolicExpressionTreeNodeEqualityComparer : Item, ISymbolicExpressionTreeNodeEqualityComparer {
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31 | [StorableConstructor]
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32 | protected SymbolicExpressionTreeNodeEqualityComparer(bool deserializing) : base(deserializing) { }
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33 | protected SymbolicExpressionTreeNodeEqualityComparer(SymbolicExpressionTreeNodeEqualityComparer original, Cloner cloner)
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34 | : base(original, cloner) {
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35 | matchConstantValues = original.matchConstantValues;
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36 | matchVariableNames = original.matchVariableNames;
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37 | matchVariableWeights = original.matchVariableWeights;
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38 | }
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39 | public override IDeepCloneable Clone(Cloner cloner) { return new SymbolicExpressionTreeNodeEqualityComparer(this, cloner); }
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40 |
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41 | // more flexible matching criteria
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42 | [Storable]
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43 | private bool matchConstantValues;
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44 | public bool MatchConstantValues {
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45 | get { return matchConstantValues; }
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46 | set { matchConstantValues = value; }
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47 | }
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48 |
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49 | [Storable]
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50 | private bool matchVariableNames;
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51 | public bool MatchVariableNames {
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52 | get { return matchVariableNames; }
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53 | set { matchVariableNames = value; }
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54 | }
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55 |
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56 | [Storable]
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57 | private bool matchVariableWeights;
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58 | public bool MatchVariableWeights {
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59 | get { return matchVariableWeights; }
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60 | set { matchVariableWeights = value; }
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61 | }
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62 |
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63 | [StorableHook(HookType.AfterDeserialization)]
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64 | private void AfterDeserialization() {
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65 | }
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66 |
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67 | public SymbolicExpressionTreeNodeEqualityComparer() {
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68 | matchConstantValues = true;
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69 | matchVariableNames = true;
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70 | matchVariableWeights = true;
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71 | }
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72 |
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73 | public int GetHashCode(ISymbolicExpressionTreeNode n) {
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74 | return n.ToString().ToLower().GetHashCode();
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75 | }
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76 |
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77 | public bool Equals(ISymbolicExpressionTreeNode a, ISymbolicExpressionTreeNode b) {
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78 | if (!(a is SymbolicExpressionTreeTerminalNode))
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79 | // if a and b are non terminal nodes, check equality of symbol names
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80 | return !(b is SymbolicExpressionTreeTerminalNode) && a.Symbol.Name.Equals(b.Symbol.Name);
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81 | var va = a as VariableTreeNode;
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82 | if (va != null) {
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83 | var vb = b as VariableTreeNode;
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84 | if (vb == null) return false;
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85 |
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86 | return (!MatchVariableNames || va.VariableName.Equals(vb.VariableName)) && (!MatchVariableWeights || va.Weight.Equals(vb.Weight));
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87 | }
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88 | var ca = a as ConstantTreeNode;
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89 | if (ca != null) {
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90 | var cb = b as ConstantTreeNode;
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91 | if (cb == null) return false;
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92 | return (!MatchConstantValues || ca.Value.Equals(cb.Value));
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93 | }
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94 | return false;
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95 | }
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96 | }
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97 | }
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