| 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2013 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.Persistence.Default.CompositeSerializers.Storable;
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| 25 |
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| 26 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.Potvin {
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| 27 | [Item("PotvinTwoLevelExchangeManipulator", "The 2M operator which manipulates a VRP representation. It is implemented as described in Potvin, J.-Y. and Bengio, S. (1996). The Vehicle Routing Problem with Time Windows - Part II: Genetic Search. INFORMS Journal of Computing, 8:165–172.")]
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| 28 | [StorableClass]
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| 29 | public sealed class PotvinTwoLevelExchangeManipulator : PotvinManipulator {
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| 30 | [StorableConstructor]
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| 31 | private PotvinTwoLevelExchangeManipulator(bool deserializing) : base(deserializing) { }
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| 32 |
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| 33 | public PotvinTwoLevelExchangeManipulator() : base() { }
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| 34 |
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| 35 | public override IDeepCloneable Clone(Cloner cloner) {
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| 36 | return new PotvinTwoLevelExchangeManipulator(this, cloner);
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| 37 | }
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| 38 |
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| 39 | private PotvinTwoLevelExchangeManipulator(PotvinTwoLevelExchangeManipulator original, Cloner cloner)
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| 40 | : base(original, cloner) {
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| 41 | }
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| 42 |
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| 43 | protected override void Manipulate(IRandom random, PotvinEncoding individual) {
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| 44 | bool allowInfeasible = AllowInfeasibleSolutions.Value.Value;
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| 45 |
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| 46 | int selectedIndex = SelectRandomTourBiasedByLength(random, individual);
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| 47 | if (selectedIndex >= 0) {
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| 48 | Tour route1 = individual.Tours[selectedIndex];
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| 49 |
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| 50 | bool performed = false;
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| 51 | int customer1Position = 0;
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| 52 | while (customer1Position < route1.Stops.Count) {
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| 53 | performed = false;
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| 54 |
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| 55 | foreach (Tour tour in individual.Tours) {
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| 56 | if (tour != route1) {
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| 57 | for (int customer2Position = 0; customer2Position < tour.Stops.Count; customer2Position++) {
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| 58 | int customer1 = route1.Stops[customer1Position];
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| 59 | int customer2 = tour.Stops[customer2Position];
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| 60 |
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| 61 | //customer1 can be feasibly inserted at the location of customer2
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| 62 | tour.Stops[customer2Position] = customer1;
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| 63 | route1.Stops.RemoveAt(customer1Position);
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| 64 |
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| 65 | if (ProblemInstance.TourFeasible(tour, individual)) {
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| 66 | int routeIdx, place;
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| 67 | if (FindInsertionPlace(individual,
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| 68 | customer2, selectedIndex, allowInfeasible, out routeIdx, out place)) {
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| 69 | individual.Tours[routeIdx].Stops.Insert(place, customer2);
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| 70 |
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| 71 | //two-level exchange has been performed
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| 72 | performed = true;
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| 73 | break;
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| 74 | } else {
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| 75 | tour.Stops[customer2Position] = customer2;
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| 76 | route1.Stops.Insert(customer1Position, customer1);
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| 77 | }
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| 78 | } else {
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| 79 | tour.Stops[customer2Position] = customer2;
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| 80 | route1.Stops.Insert(customer1Position, customer1);
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| 81 | }
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| 82 | }
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| 83 | }
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| 84 |
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| 85 | if (performed)
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| 86 | break;
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| 87 | }
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| 88 |
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| 89 | if (!performed)
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| 90 | customer1Position++;
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| 91 | }
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| 92 | }
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| 93 | }
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| 94 | }
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| 95 | }
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