[4379] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2010 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.Data;
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| 25 | using HeuristicLab.Encodings.PermutationEncoding;
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| 26 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 27 | using System.Collections.Generic;
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| 28 | using HeuristicLab.Problems.VehicleRouting.Encodings.General;
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| 29 | using System;
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| 30 | using HeuristicLab.Problems.VehicleRouting.Interfaces;
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| 31 |
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| 32 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.Zhu {
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| 33 | [Item("ZhuEncoding", "Represents a Zhu encoding of VRP solutions. It is implemented as described in Zhu, K.Q. (2000). A New Genetic Algorithm For VRPTW. Proceedings of the International Conference on Artificial Intelligence.")]
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| 34 | [StorableClass]
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| 35 | public class ZhuEncoding : PermutationEncoding {
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| 36 | #region IVRPEncoding Members
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| 37 | public override List<Tour> GetTours() {
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| 38 | List<Tour> result = new List<Tour>();
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| 39 |
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| 40 | Tour newTour = new Tour();
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| 41 |
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| 42 | for (int i = 0; i < this.Length; i++) {
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| 43 | int city = this[i] + 1;
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| 44 | newTour.Stops.Add(city);
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| 45 | if (!ProblemInstance.Feasible(newTour)) {
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| 46 | newTour.Stops.Remove(city);
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| 47 | if (newTour.Stops.Count > 0)
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| 48 | result.Add(newTour);
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| 49 |
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| 50 | newTour = new Tour();
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| 51 | newTour.Stops.Add(city);
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| 52 | }
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| 53 | }
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| 54 |
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| 55 | if (newTour.Stops.Count > 0)
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| 56 | result.Add(newTour);
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| 57 |
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| 58 | //if there are too many vehicles - repair
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| 59 | while (result.Count > ProblemInstance.Vehicles.Value) {
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| 60 | Tour tour = result[result.Count - 1];
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| 61 |
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| 62 | //find predecessor / successor in permutation
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| 63 | int predecessorIndex = Array.IndexOf(this.array, tour.Stops[0] - 1) - 1;
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| 64 | if (predecessorIndex >= 0) {
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| 65 | int predecessor = this[predecessorIndex] + 1;
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| 66 |
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| 67 | foreach (Tour t in result) {
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| 68 | int insertPosition = t.Stops.IndexOf(predecessor) + 1;
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| 69 | if (insertPosition != -1) {
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| 70 | t.Stops.InsertRange(insertPosition, tour.Stops);
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| 71 | break;
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| 72 | }
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| 73 | }
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| 74 | } else {
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| 75 | int successorIndex = Array.IndexOf(this.array,
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| 76 | tour.Stops[tour.Stops.Count - 1] - 1) + 1;
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| 77 | int successor = this[successorIndex] + 1;
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| 78 |
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| 79 | foreach (Tour t in result) {
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| 80 | int insertPosition = t.Stops.IndexOf(successor);
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| 81 | if (insertPosition != -1) {
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| 82 | t.Stops.InsertRange(insertPosition, tour.Stops);
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| 83 | break;
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| 84 | }
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| 85 | }
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| 86 | }
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| 87 |
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| 88 | result.Remove(tour);
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| 89 | }
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| 90 |
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| 91 | return result;
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| 92 | }
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| 93 | #endregion
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| 94 |
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[4752] | 95 | public ZhuEncoding(Permutation permutation, IVRPProblemInstance problemInstance)
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| 96 | : base(permutation, problemInstance) {
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| 97 | }
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[4379] | 98 |
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[4752] | 99 | public override IDeepCloneable Clone(Cloner cloner) {
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| 100 | return new ZhuEncoding(this, cloner);
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[4379] | 101 | }
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| 102 |
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[4752] | 103 | protected ZhuEncoding(ZhuEncoding original, Cloner cloner)
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| 104 | : base(original, cloner) {
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[4379] | 105 | }
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| 106 |
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| 107 | [StorableConstructor]
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| 108 | private ZhuEncoding(bool serializing)
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| 109 | : base(serializing) {
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| 110 | }
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| 111 |
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| 112 | public static ZhuEncoding ConvertFrom(IVRPEncoding encoding, IVRPProblemInstance problemInstance) {
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| 113 | List<Tour> tours = encoding.GetTours();
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| 114 | List<int> route = new List<int>();
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| 115 |
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| 116 | foreach (Tour tour in tours) {
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| 117 | foreach (int city in tour.Stops)
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| 118 | route.Add(city - 1);
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| 119 | }
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| 120 |
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| 121 | return new ZhuEncoding(
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| 122 | new Permutation(PermutationTypes.RelativeUndirected, route.ToArray()), problemInstance);
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| 123 | }
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| 124 |
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| 125 | public static ZhuEncoding ConvertFrom(List<int> routeParam, IVRPProblemInstance problemInstance) {
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| 126 | List<int> route = new List<int>(routeParam);
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| 127 |
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| 128 | while (route.Remove(0)) { //remove all delimiters (0)
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| 129 | }
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| 130 |
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| 131 | for (int i = 0; i < route.Count; i++)
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| 132 | route[i]--;
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| 133 |
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| 134 | return new ZhuEncoding(
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| 135 | new Permutation(PermutationTypes.RelativeUndirected, route.ToArray()), problemInstance);
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| 136 | }
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| 137 | }
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| 138 | }
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