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source: trunk/sources/HeuristicLab.Problems.VehicleRouting/3.4/Encodings/GVR/Manipulators/GVRDisplacementManipulator.cs @ 14615

Last change on this file since 14615 was 14185, checked in by swagner, 8 years ago

#2526: Updated year of copyrights in license headers

File size: 3.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 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.Persistence.Default.CompositeSerializers.Storable;
26
27namespace HeuristicLab.Problems.VehicleRouting.Encodings.GVR {
28  [Item("GVRDisplacementManipulator", "An operator which manipulates a GVR representation by applying a displacement operation. It is implemented as described in Pereira, F.B. et al (2002). GVR: a New Genetic Representation for the Vehicle Routing Problem. AICS 2002, LNAI 2464, pp. 95-102.")]
29  [StorableClass]
30  public sealed class GVRDisplacementManipulator : GVRManipulator {
31    [StorableConstructor]
32    private GVRDisplacementManipulator(bool deserializing) : base(deserializing) { }
33
34    public GVRDisplacementManipulator()
35      : base() {
36    }
37
38    public override IDeepCloneable Clone(Cloner cloner) {
39      return new GVRDisplacementManipulator(this, cloner);
40    }
41
42    private GVRDisplacementManipulator(GVRDisplacementManipulator original, Cloner cloner)
43      : base(original, cloner) {
44    }
45
46    protected override void Manipulate(IRandom random, GVREncoding individual) {
47      Tour tour = individual.Tours[random.Next(individual.Tours.Count)];
48      int breakPoint1 = random.Next(tour.Stops.Count);
49      int length = random.Next(1, tour.Stops.Count - breakPoint1 + 1);
50
51      List<int> displaced = tour.Stops.GetRange(breakPoint1, length);
52      tour.Stops.RemoveRange(breakPoint1, length);
53      //with a probability of 1/(2*V) create a new tour, else insert at another position
54      if (individual.GetTours().Count > 0 &&
55        individual.GetTours().Count < ProblemInstance.Vehicles.Value &&
56        random.Next(individual.GetTours().Count * 2) == 0) {
57        Tour newTour = new Tour();
58        newTour.Stops.InsertRange(0, displaced);
59
60        individual.Tours.Add(newTour);
61      } else {
62        Tour newTour = individual.Tours[random.Next(individual.Tours.Count)];
63        int newPosition = newTour.Stops.Count;
64
65        newTour.Stops.InsertRange(newPosition, displaced);
66      }
67
68      if (tour.Stops.Count == 0)
69        individual.Tours.Remove(tour);
70    }
71  }
72}
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