[4379] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[17226] | 3 | * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[4379] | 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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[8053] | 22 | using System.Collections.Generic;
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| 23 | using HeuristicLab.Common;
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[4379] | 24 | using HeuristicLab.Core;
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[16723] | 25 | using HEAL.Attic;
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[4379] | 26 |
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| 27 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.Prins {
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| 28 | [Item("PrinsExhaustiveLSManipulator", "An operator which manipulates a VRP representation by using the exhaustive Prins local search. 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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[16723] | 29 | [StorableType("D0C880A5-B777-436D-9E01-0A450C1327C5")]
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[8053] | 30 | public sealed class PrinsExhaustiveLSManipulator : PrinsLSManipulator {
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[4379] | 31 | [StorableConstructor]
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[16723] | 32 | private PrinsExhaustiveLSManipulator(StorableConstructorFlag _) : base(_) { }
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[4379] | 33 |
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| 34 | public PrinsExhaustiveLSManipulator()
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| 35 | : base() {
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| 36 | }
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| 37 |
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[4752] | 38 | public override IDeepCloneable Clone(Cloner cloner) {
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| 39 | return new PrinsExhaustiveLSManipulator(this, cloner);
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| 40 | }
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| 41 |
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| 42 | private PrinsExhaustiveLSManipulator(PrinsExhaustiveLSManipulator original, Cloner cloner)
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| 43 | : base(original, cloner) {
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| 44 | }
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| 45 |
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[17698] | 46 | protected override void Manipulate(IRandom random, PrinsEncodedSolution individual) {
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[4379] | 47 | List<Tour> tours = individual.GetTours();
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| 48 | bool improvement = false;
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| 49 | int iterations = 0;
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| 50 |
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| 51 | do {
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| 52 | int u = depot;
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| 53 | improvement = false;
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| 54 | double originalQuality = GetQuality(individual);
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[17698] | 55 | PrinsEncodedSolution child = null;
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[4379] | 56 |
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| 57 | while (!improvement && u < ProblemInstance.Cities.Value) {
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| 58 | int v = depot;
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| 59 | while (!improvement && v < ProblemInstance.Cities.Value) {
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| 60 | if (u != v) {
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| 61 | child = Manipulate(individual,
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| 62 | originalQuality, u, v);
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| 63 |
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| 64 | improvement = child != null;
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| 65 | }
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| 66 | v++;
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| 67 | }
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| 68 | u++;
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| 69 | }
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| 70 |
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| 71 | if (improvement) {
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| 72 | for (int i = 0; i < child.Length; i++) {
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| 73 | individual[i] = child[i];
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| 74 | }
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| 75 | }
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| 76 |
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| 77 | iterations++;
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[8053] | 78 | } while (improvement &&
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[4379] | 79 | iterations < Iterations.Value.Value);
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| 80 | }
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| 81 | }
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| 82 | }
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