1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2012 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.Optimization;
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26 | using HeuristicLab.Parameters;
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27 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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28 |
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29 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.Alba {
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30 | [Item("RandomCreator", "Creates a randomly initialized VRP solution.")]
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31 | [StorableClass]
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32 | public sealed class RandomCreator : AlbaCreator, IStochasticOperator {
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33 | #region IStochasticOperator Members
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34 | public ILookupParameter<IRandom> RandomParameter {
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35 | get { return (LookupParameter<IRandom>)Parameters["Random"]; }
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36 | }
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37 | #endregion
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38 |
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39 | [StorableConstructor]
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40 | private RandomCreator(bool deserializing) : base(deserializing) { }
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41 |
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42 | public RandomCreator()
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43 | : base() {
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44 | Parameters.Add(new LookupParameter<IRandom>("Random", "The pseudo random number generator."));
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45 | }
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46 |
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47 | public override IDeepCloneable Clone(Cloner cloner) {
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48 | return new RandomCreator(this, cloner);
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49 | }
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50 |
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51 | private RandomCreator(RandomCreator original, Cloner cloner)
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52 | : base(original, cloner) {
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53 | }
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54 |
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55 | private List<int> CreateSolution() {
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56 | int cities = ProblemInstance.Cities.Value;
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57 | int vehicles = ProblemInstance.Vehicles.Value;
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58 |
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59 | int[] perm = new int[cities + vehicles];
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60 | int[] sortingArray = new int[perm.Length - 2];
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61 | for (int i = 0; i < cities; i++)
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62 | perm[i] = i + 1;
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63 | for (int i = cities; i < cities + vehicles; i++)
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64 | perm[i] = -(i - cities);
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65 | for (int i = 0; i < perm.Length - 2; i++) {
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66 | sortingArray[i] = RandomParameter.ActualValue.Next(perm.Length * 2);
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67 | }
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68 | // shuffle perm from 1...n-1 by sorting sortingArray (perm[0] and perm[n] must stay 0)
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69 | bool done;
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70 | do {
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71 | done = true;
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72 | for (int i = 0; i < perm.Length - 3; i++) {
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73 | if (sortingArray[i] > sortingArray[i + 1]) {
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74 | int h = sortingArray[i];
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75 | sortingArray[i] = sortingArray[i + 1];
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76 | sortingArray[i + 1] = h;
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77 | h = perm[i + 1];
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78 | perm[i + 1] = perm[i + 2];
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79 | perm[i + 2] = h;
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80 | done = false;
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81 | }
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82 | }
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83 | } while (!done);
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84 |
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85 | return new List<int>(perm);
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86 | }
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87 |
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88 | public override IOperation Apply() {
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89 | //choose default encoding here
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90 | VRPToursParameter.ActualValue = AlbaEncoding.ConvertFrom(CreateSolution(), ProblemInstance);
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91 |
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92 | return base.Apply();
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93 | }
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94 | }
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95 | }
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