#region License Information
/* HeuristicLab
* Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
*
* This file is part of HeuristicLab.
*
* HeuristicLab is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* HeuristicLab is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with HeuristicLab. If not, see .
*/
#endregion
using System.Collections.Generic;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Problems.VehicleRouting.Encodings.General;
namespace HeuristicLab.Problems.VehicleRouting.Encodings.GVR {
[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.")]
[StorableClass]
public class GVREncoding : TourEncoding {
[Storable]
private DoubleValue capacity { get; set; }
[Storable]
private DoubleArray demand { get; set; }
public override List GetTours(ILookupParameter distanceMatrix = null, int maxVehicles = int.MaxValue) {
List tours = new List();
foreach (Tour tour in base.Tours) {
Tour newTour = new Tour();
double currentDemand = 0;
foreach (int city in tour.Cities) {
currentDemand += demand[city];
if (currentDemand > capacity.Value) {
if(newTour.Cities.Count > 0)
tours.Add(newTour);
newTour = new Tour();
newTour.Cities.Add(city);
currentDemand = demand[city];
} else {
newTour.Cities.Add(city);
}
}
if (newTour.Cities.Count > 0)
tours.Add(newTour);
}
//repair if there are too many vehicles used
while (tours.Count > maxVehicles) {
Tour tour = tours[tours.Count - 1];
tours[tours.Count - 2].Cities.AddRange(tour.Cities);
tours.Remove(tour);
}
return tours;
}
[StorableConstructor]
protected GVREncoding(bool deserializing) : base(deserializing) { }
protected GVREncoding(GVREncoding original, Cloner cloner)
: base(original, cloner) {
this.capacity = original.capacity;
this.demand = original.demand;
this.Tours = cloner.Clone(original.Tours);
}
public override IDeepCloneable Clone(Cloner cloner) {
return new GVREncoding(this, cloner);
}
public GVREncoding(DoubleValue capacity, DoubleArray demand)
: base() {
this.capacity = capacity;
this.demand = demand;
}
public static GVREncoding ConvertFrom(IVRPEncoding encoding, DoubleValue capacity, DoubleArray demand,
ILookupParameter distanceMatrix) {
GVREncoding solution = new GVREncoding(capacity, demand);
TourEncoding.ConvertFrom(encoding, solution, distanceMatrix);
return solution;
}
public static GVREncoding ConvertFrom(List route, DoubleValue capacity, DoubleArray demand) {
GVREncoding solution = new GVREncoding(capacity, demand);
TourEncoding.ConvertFrom(route, solution);
return solution;
}
internal void FindCustomer(int customer, out Tour tour, out int index) {
tour = null;
index = -1;
int currentTour = 0;
while (tour == null && currentTour < Tours.Count) {
int currentCity = 0;
while (tour == null && currentCity < Tours[currentTour].Cities.Count) {
if (Tours[currentTour].Cities[currentCity] == customer) {
tour = Tours[currentTour];
index = currentCity;
}
currentCity++;
}
currentTour++;
}
}
}
}