1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2016 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.PermutationEncoding;
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25 | using HeuristicLab.Parameters;
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26 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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27 |
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28 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.Prins {
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29 | [Item("PrinsPermutationCrossover", "An operator which crosses two VRP representations using a standard permutation operator. It is implemented as described in Prins, C. (2004). A simple and effective evolutionary algorithm for the vehicle routing problem. Computers & Operations Research, 12:1985-2002.")]
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30 | [StorableClass]
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31 | public sealed class PrinsPermutationCrossover : PrinsCrossover, IPrinsOperator {
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32 | public IValueLookupParameter<IPermutationCrossover> InnerCrossoverParameter {
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33 | get { return (IValueLookupParameter<IPermutationCrossover>)Parameters["InnerCrossover"]; }
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34 | }
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35 |
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36 | [StorableConstructor]
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37 | private PrinsPermutationCrossover(bool deserializing) : base(deserializing) { }
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38 |
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39 | public PrinsPermutationCrossover()
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40 | : base() {
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41 | Parameters.Add(new ValueLookupParameter<IPermutationCrossover>("InnerCrossover", "The permutation crossover.", new OrderCrossover()));
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42 | }
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43 |
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44 | public override IDeepCloneable Clone(Cloner cloner) {
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45 | return new PrinsPermutationCrossover(this, cloner);
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46 | }
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47 |
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48 | private PrinsPermutationCrossover(PrinsPermutationCrossover original, Cloner cloner)
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49 | : base(original, cloner) {
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50 | }
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51 |
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52 | protected override PrinsEncoding Crossover(IRandom random, PrinsEncoding parent1, PrinsEncoding parent2) {
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53 | if (parent1.Length != parent2.Length)
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54 | return parent1.Clone() as PrinsEncoding;
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55 |
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56 | //note - the inner crossover is called here and the result is converted to a prins representation
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57 | //some refactoring should be done here in the future - the crossover operation should be called directly
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58 |
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59 | InnerCrossoverParameter.ActualValue.ParentsParameter.ActualName = ParentsParameter.ActualName;
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60 | IAtomicOperation op = this.ExecutionContext.CreateOperation(
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61 | InnerCrossoverParameter.ActualValue, this.ExecutionContext.Scope);
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62 | op.Operator.Execute((IExecutionContext)op, CancellationToken);
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63 |
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64 | string childName = InnerCrossoverParameter.ActualValue.ChildParameter.ActualName;
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65 | if (ExecutionContext.Scope.Variables.ContainsKey(childName)) {
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66 | Permutation permutation = ExecutionContext.Scope.Variables[childName].Value as Permutation;
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67 | ExecutionContext.Scope.Variables.Remove(childName);
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68 |
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69 | return new PrinsEncoding(permutation, ProblemInstance);
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70 | } else
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71 | return null;
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72 | }
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73 | }
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74 | }
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