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source: branches/HiveHiveEngine/HeuristicLab.Problems.VehicleRouting/3.3/Encodings/Alba/Moves/IntraRouteInversion/AlbaStochasticIntraRouteInversionSingleMoveGenerator.cs @ 7284

Last change on this file since 7284 was 7259, checked in by swagner, 13 years ago

Updated year of copyrights to 2012 (#1716)

File size: 4.2 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System.Collections.Generic;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Optimization;
26using HeuristicLab.Parameters;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28using HeuristicLab.Problems.VehicleRouting.Encodings.General;
29
30namespace HeuristicLab.Problems.VehicleRouting.Encodings.Alba {
31  [Item("AlbaStochasticIntraRouteInversionSingleMoveGenerator", "Generates one random intra route inversion move from a given VRP encoding.  It is implemented as described in Alba, E. and Dorronsoro, B. (2004). Solving the Vehicle Routing Problem by Using Cellular Genetic Algorithms.")]
32  [StorableClass]
33  public sealed class AlbaStochasticIntraRouteInversionSingleMoveGenerator : AlbaIntraRouteInversionMoveGenerator,
34    IStochasticOperator, ISingleMoveGenerator, IAlbaIntraRouteInversionMoveOperator, IMultiVRPMoveGenerator {
35    #region IMultiVRPMoveOperator Members
36
37    public ILookupParameter VRPMoveParameter {
38      get { return (ILookupParameter)Parameters["AlbaIntraRouteInversionMove"]; }
39    }
40
41    #endregion
42
43    public ILookupParameter<IRandom> RandomParameter {
44      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
45    }
46
47    [StorableConstructor]
48    private AlbaStochasticIntraRouteInversionSingleMoveGenerator(bool deserializing) : base(deserializing) { }
49    private AlbaStochasticIntraRouteInversionSingleMoveGenerator(AlbaStochasticIntraRouteInversionSingleMoveGenerator original, Cloner cloner) : base(original, cloner) { }
50    public AlbaStochasticIntraRouteInversionSingleMoveGenerator()
51      : base() {
52      Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator."));
53    }
54
55    public override IDeepCloneable Clone(Cloner cloner) {
56      return new AlbaStochasticIntraRouteInversionSingleMoveGenerator(this, cloner);
57    }
58
59    public static AlbaIntraRouteInversionMove Apply(AlbaEncoding individual, int cities, IRandom rand) {
60      int index1 = -1;
61      int index2 = -1;
62
63      List<Tour> validTours = new List<Tour>();
64      foreach (Tour tour in individual.GetTours()) {
65        if (tour.Cities.Count >= 4)
66          validTours.Add(tour);
67      }
68
69      if (validTours.Count > 0) {
70        Tour chosenTour = validTours[rand.Next(validTours.Count)];
71        int currentTourStart = -1;
72        for (int i = 0; i < individual.Length; i++) {
73          if (individual[i] + 1 == chosenTour.Cities[0]) {
74            currentTourStart = i;
75            break;
76          }
77        }
78
79        int currentTourEnd = currentTourStart;
80        while (currentTourEnd < individual.Length &&
81          individual[currentTourEnd] < individual.Cities) {
82          currentTourEnd++;
83        }
84
85        int tourLength = currentTourEnd - currentTourStart;
86        int a = rand.Next(tourLength - 3);
87        index1 = currentTourStart + a;
88        index2 = currentTourStart + rand.Next(a + 2, tourLength - 1);
89      }
90
91      return new AlbaIntraRouteInversionMove(index1, index2, individual);
92    }
93
94    protected override AlbaIntraRouteInversionMove[] GenerateMoves(AlbaEncoding individual) {
95      List<AlbaIntraRouteInversionMove> moves = new List<AlbaIntraRouteInversionMove>();
96
97      AlbaIntraRouteInversionMove move = Apply(individual, Cities, RandomParameter.ActualValue);
98      if (move != null)
99        moves.Add(move);
100
101      return moves.ToArray();
102    }
103  }
104}
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