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source: trunk/sources/HeuristicLab.Problems.VehicleRouting/3.4/Encodings/GVR/Manipulators/GVRInsertionManipulator.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: 2.8 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
25
26namespace HeuristicLab.Problems.VehicleRouting.Encodings.GVR {
27  [Item("GVRInsertionManipulator", "An operator which manipulates a GVR representation by inserting a customer at another location. 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.")]
28  [StorableClass]
29  public sealed class GVRInsertionManipulator : GVRManipulator {
30    [StorableConstructor]
31    private GVRInsertionManipulator(bool deserializing) : base(deserializing) { }
32
33    public GVRInsertionManipulator()
34      : base() {
35    }
36
37    public override IDeepCloneable Clone(Cloner cloner) {
38      return new GVRInsertionManipulator(this, cloner);
39    }
40
41    private GVRInsertionManipulator(GVRInsertionManipulator original, Cloner cloner)
42      : base(original, cloner) {
43    }
44
45    protected override void Manipulate(IRandom random, GVREncoding individual) {
46      int customer = random.Next(1, individual.Cities + 1);
47      Tour tour;
48      int position;
49      individual.FindCustomer(customer, out tour, out position);
50
51      tour.Stops.RemoveAt(position);
52
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.Add(customer);
59
60        individual.Tours.Add(newTour);
61      } else {
62        Tour newTour = individual.Tours[random.Next(individual.Tours.Count)];
63        int newPosition = random.Next(newTour.Stops.Count + 1);
64
65        newTour.Stops.Insert(newPosition, customer);
66      }
67
68      if (tour.Stops.Count == 0)
69        individual.Tours.Remove(tour);
70    }
71  }
72}
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