[7145] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2011 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 System.Collections.Generic;
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| 23 | using HeuristicLab.Common;
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| 24 | using HeuristicLab.Core;
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| 25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 26 | using HeuristicLab.Data;
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| 27 | using HeuristicLab.Parameters;
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| 28 | using HeuristicLab.Problems.VehicleRouting.Encodings.Potvin;
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| 29 | using HeuristicLab.Problems.VehicleRouting.Encodings;
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| 30 | using HeuristicLab.Problems.VehicleRouting;
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[9750] | 31 | using HeuristicLab.Problems.VehicleRouting.Interfaces;
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[7145] | 32 |
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[7159] | 33 | namespace HeuristicLab.Analysis.FitnessLandscape.VRP {
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| 34 | [Item("TwoOptStarManipulator", "Two opt star manipulation")]
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[7145] | 35 | [StorableClass]
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[7159] | 36 | public sealed class TwoOptStarManipulator : PotvinManipulator {
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[7145] | 37 | [StorableConstructor]
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[7159] | 38 | private TwoOptStarManipulator(bool deserializing) : base(deserializing) { }
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| 39 | private TwoOptStarManipulator(TwoOptStarManipulator original, Cloner cloner)
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[7145] | 40 | : base(original, cloner) {
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| 41 | }
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| 42 | public override IDeepCloneable Clone(Cloner cloner) {
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[7159] | 43 | return new TwoOptStarManipulator(this, cloner);
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[7145] | 44 | }
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[7159] | 45 | public TwoOptStarManipulator()
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[7145] | 46 | : base() {
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| 47 | }
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| 48 |
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[9750] | 49 | public static void Apply(IRandom random, PotvinEncoding individual, IVRPProblemInstance problemInstance, bool allowInfeasible) {
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[7145] | 50 | bool feasible;
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[9836] | 51 | int count = 0;
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[7145] | 52 |
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[7151] | 53 | //consider creating new tour
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| 54 | individual.Tours.Add(new Tour());
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| 55 |
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[7145] | 56 | do {
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| 57 | feasible = true;
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| 58 |
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[7151] | 59 | int route1Idx = random.Next(individual.Tours.Count);
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| 60 | int route2Idx = random.Next(individual.Tours.Count - 1);
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| 61 | if (route2Idx >= route1Idx)
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| 62 | route2Idx++;
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[7145] | 63 |
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[7151] | 64 | Tour route1 = individual.Tours[route1Idx];
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| 65 | Tour route2 = individual.Tours[route2Idx];
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[7145] | 66 |
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[9750] | 67 | int x1 = random.Next(route1.Stops.Count + 1);
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| 68 | int x2 = random.Next(route2.Stops.Count + 1);
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[7145] | 69 |
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[9836] | 70 | var originalFeasible =
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| 71 | problemInstance.TourFeasible(route1, individual) &&
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| 72 | problemInstance.TourFeasible(route2, individual);
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[7145] | 73 |
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[9836] | 74 | SwapSegments(x1, route1, x2, route2);
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[7151] | 75 |
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[9836] | 76 | if (!allowInfeasible && originalFeasible) {
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| 77 | feasible = problemInstance.TourFeasible(route1, individual) &&
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| 78 | problemInstance.TourFeasible(route2, individual);
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| 79 | if (!feasible) SwapSegments(x1, route1, x2, route2);
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| 80 | }
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| 81 | } while (!feasible && count++ < 100);
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[7145] | 82 |
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[9750] | 83 | individual.Tours.RemoveAll(t => t.Stops.Count == 0);
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[7145] | 84 | }
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| 85 |
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[9836] | 86 | private static void SwapSegments(int x1, Tour route1, int x2, Tour route2) {
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| 87 | int count = route1.Stops.Count - x1;
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| 88 | List<int> segmentX1 = new List<int>();
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| 89 | if (count > 0) {
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| 90 | segmentX1 = route1.Stops.GetRange(x1, count);
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| 91 | route1.Stops.RemoveRange(x1, count);
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| 92 | }
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| 93 | count = route2.Stops.Count - x2;
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| 94 | List<int> segmentX2 = new List<int>();
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| 95 | if (count > 0) {
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| 96 | segmentX2 = route2.Stops.GetRange(x2, count);
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| 97 | route2.Stops.RemoveRange(x2, count);
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| 98 | }
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| 99 | route1.Stops.AddRange(segmentX2);
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| 100 | route2.Stops.AddRange(segmentX1);
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| 101 | }
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| 102 |
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[7145] | 103 | protected override void Manipulate(IRandom random, PotvinEncoding individual) {
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| 104 | bool allowInfeasible = AllowInfeasibleSolutions.Value.Value;
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[9750] | 105 | Apply(random, individual, ProblemInstance, allowInfeasible);
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[7145] | 106 | }
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| 107 | }
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| 108 | }
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