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source: stable/HeuristicLab.Problems.VehicleRouting/3.4/Encodings/GVR/GVREncoding.cs @ 15094

Last change on this file since 15094 was 14186, checked in by swagner, 8 years ago

#2526: Updated year of copyrights in license headers

File size: 4.3 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.Data;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27using HeuristicLab.Problems.VehicleRouting.Encodings.General;
28using HeuristicLab.Problems.VehicleRouting.Interfaces;
29using HeuristicLab.Problems.VehicleRouting.Variants;
30
31namespace HeuristicLab.Problems.VehicleRouting.Encodings.GVR {
32  [Item("GVREncoding", "Represents a potvin encoding of VRP solutions. 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.")]
33  [StorableClass]
34  public class GVREncoding : TourEncoding {
35    public override List<Tour> GetTours() {
36      List<Tour> tours = new List<Tour>();
37
38      foreach (Tour tour in base.Tours) {
39        Tour newTour = new Tour();
40        double currentDemand = 0;
41
42        DoubleValue capacity = new DoubleValue(double.MaxValue);
43        if (ProblemInstance is IHomogenousCapacitatedProblemInstance) {
44          capacity.Value = (ProblemInstance as IHomogenousCapacitatedProblemInstance).Capacity.Value;
45        }
46
47
48        foreach (int city in tour.Stops) {
49          currentDemand += ProblemInstance.GetDemand(city);
50
51          if (currentDemand > capacity.Value) {
52            if (newTour.Stops.Count > 0)
53              tours.Add(newTour);
54
55            newTour = new Tour();
56            newTour.Stops.Add(city);
57            currentDemand = ProblemInstance.GetDemand(city);
58          } else {
59            newTour.Stops.Add(city);
60          }
61        }
62
63        if (newTour.Stops.Count > 0)
64          tours.Add(newTour);
65      }
66
67      //repair if there are too many vehicles used
68      while (tours.Count > ProblemInstance.Vehicles.Value) {
69        Tour tour = tours[tours.Count - 1];
70        tours[tours.Count - 2].Stops.AddRange(tour.Stops);
71
72        tours.Remove(tour);
73      }
74
75      return tours;
76    }
77
78    public GVREncoding(IVRPProblemInstance problemInstance)
79      : base(problemInstance) {
80    }
81
82    [StorableConstructor]
83    protected GVREncoding(bool serializing)
84      : base(serializing) {
85    }
86
87    public override IDeepCloneable Clone(Cloner cloner) {
88      return new GVREncoding(this, cloner);
89    }
90
91    protected GVREncoding(GVREncoding original, Cloner cloner)
92      : base(original, cloner) {
93    }
94
95    public static GVREncoding ConvertFrom(IVRPEncoding encoding, IVRPProblemInstance problemInstance) {
96      GVREncoding solution = new GVREncoding(problemInstance);
97
98      TourEncoding.ConvertFrom(encoding, solution, problemInstance);
99
100      return solution;
101    }
102
103    public static GVREncoding ConvertFrom(List<int> route, IVRPProblemInstance problemInstance) {
104      GVREncoding solution = new GVREncoding(problemInstance);
105
106      TourEncoding.ConvertFrom(route, solution);
107
108      return solution;
109    }
110
111    internal void FindCustomer(int customer, out Tour tour, out int index) {
112      tour = null;
113      index = -1;
114
115      int currentTour = 0;
116      while (tour == null && currentTour < Tours.Count) {
117        int currentCity = 0;
118        while (tour == null && currentCity < Tours[currentTour].Stops.Count) {
119          if (Tours[currentTour].Stops[currentCity] == customer) {
120            tour = Tours[currentTour];
121            index = currentCity;
122          }
123
124          currentCity++;
125        }
126
127        currentTour++;
128      }
129    }
130  }
131}
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