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source: branches/VRP/HeuristicLab.Problems.VehicleRouting/3.4/Encodings/GVR/GVREncoding.cs @ 7835

Last change on this file since 7835 was 6851, checked in by svonolfe, 13 years ago

Added support for multi depot CVRP instances (#1177)

File size: 4.4 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 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.Data;
25using HeuristicLab.Encodings.PermutationEncoding;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27using System.Drawing;
28using System.Collections.Generic;
29using HeuristicLab.Problems.VehicleRouting.Encodings.General;
30using HeuristicLab.Problems.VehicleRouting.Interfaces;
31using HeuristicLab.Problems.VehicleRouting.Variants;
32
33namespace HeuristicLab.Problems.VehicleRouting.Encodings.GVR {
34  [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.")]
35  [StorableClass]
36  public class GVREncoding : TourEncoding {
37    public override List<Tour> GetTours() {
38      List<Tour> tours = new List<Tour>();   
39
40      foreach (Tour tour in base.Tours) {
41        Tour newTour = new Tour();
42        double currentDemand = 0;
43
44        DoubleValue capacity = new DoubleValue(double.MaxValue);
45        if (ProblemInstance is IHomogenousCapacitatedProblemInstance) {
46          capacity.Value = (ProblemInstance as IHomogenousCapacitatedProblemInstance).Capacity.Value;
47        }
48
49
50        foreach (int city in tour.Stops) {
51          currentDemand += ProblemInstance.GetDemand(city);
52
53          if (currentDemand > capacity.Value) {
54            if (newTour.Stops.Count > 0)
55              tours.Add(newTour);
56
57            newTour = new Tour();
58            newTour.Stops.Add(city);
59            currentDemand = ProblemInstance.GetDemand(city);
60          } else {
61            newTour.Stops.Add(city);
62          }
63        }
64
65        if (newTour.Stops.Count > 0)
66          tours.Add(newTour);
67      }
68
69      //repair if there are too many vehicles used
70      while (tours.Count > ProblemInstance.Vehicles.Value) {
71        Tour tour = tours[tours.Count - 1];
72        tours[tours.Count - 2].Stops.AddRange(tour.Stops);
73
74        tours.Remove(tour);
75      }
76
77      return tours;
78    }
79   
80    public GVREncoding(IVRPProblemInstance problemInstance)
81      : base(problemInstance) {
82    }
83
84    [StorableConstructor]
85    private GVREncoding(bool serializing)
86      : base(serializing) {
87    }
88
89    public override IDeepCloneable Clone(Cloner cloner) {
90      return new GVREncoding(this, cloner);
91    }
92
93    protected GVREncoding(GVREncoding original, Cloner cloner)
94      : base(original, cloner) {
95    }
96
97    public static GVREncoding ConvertFrom(IVRPEncoding encoding, IVRPProblemInstance problemInstance) {
98      GVREncoding solution = new GVREncoding(problemInstance);
99
100      TourEncoding.ConvertFrom(encoding, solution, problemInstance);
101
102      return solution;
103    }
104
105    public static GVREncoding ConvertFrom(List<int> route, IVRPProblemInstance problemInstance) {
106      GVREncoding solution = new GVREncoding(problemInstance);
107
108      TourEncoding.ConvertFrom(route, solution);
109
110      return solution;
111    }
112
113    internal void FindCustomer(int customer, out Tour tour, out int index) {
114      tour = null;
115      index = -1;
116
117      int currentTour = 0;
118      while (tour == null && currentTour < Tours.Count) {
119        int currentCity = 0;
120        while (tour == null && currentCity < Tours[currentTour].Stops.Count) {
121          if (Tours[currentTour].Stops[currentCity] == customer) {
122            tour = Tours[currentTour];
123            index = currentCity;
124          }
125
126          currentCity++;
127        }
128
129        currentTour++;
130      }
131    }
132  }
133}
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