source: branches/VRP/HeuristicLab.Problems.VehicleRouting/3.4/Encodings/Potvin/Moves/PickupDelivery/PDShift/PotvinPDShiftSingleMoveGenerator.cs @ 6909

Last change on this file since 6909 was 6909, checked in by svonolfe, 8 years ago

Fixed more isses that occured in dynamic instances (#1177)

File size: 3.7 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 System;
23using HeuristicLab.Core;
24using HeuristicLab.Optimization;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26using HeuristicLab.Parameters;
27using System.Collections.Generic;
28using HeuristicLab.Problems.VehicleRouting.Interfaces;
29using HeuristicLab.Common;
30using HeuristicLab.Data;
31using HeuristicLab.Problems.VehicleRouting.Encodings.General;
32using HeuristicLab.Problems.VehicleRouting.Variants;
33
34namespace HeuristicLab.Problems.VehicleRouting.Encodings.Potvin {
35  [Item("PotvinPDShiftSingleMoveGenerator", "Generates a single shift move from a given PDP encoding.")]
36  [StorableClass]
37  public sealed class PotvinPDShiftSingleMoveGenerator : PotvinPDShiftMoveGenerator,
38    ISingleMoveGenerator {   
39    public ILookupParameter<IRandom> RandomParameter {
40      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
41    }
42
43    public override IDeepCloneable Clone(Cloner cloner) {
44      return new PotvinPDShiftSingleMoveGenerator(this, cloner);
45    }
46
47    [StorableConstructor]
48    private PotvinPDShiftSingleMoveGenerator(bool deserializing) : base(deserializing) { }
49
50    public PotvinPDShiftSingleMoveGenerator()
51      : base() {
52      Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator."));
53    }
54
55    private PotvinPDShiftSingleMoveGenerator(PotvinPDShiftSingleMoveGenerator original, Cloner cloner)
56      : base(original, cloner) {
57    }
58
59    public static PotvinPDShiftMove Apply(PotvinEncoding individual, IVRPProblemInstance problemInstance, IRandom rand) {
60      List<int> cities = new List<int>();
61
62      IPickupAndDeliveryProblemInstance pdp = problemInstance as IPickupAndDeliveryProblemInstance;
63      for (int i = 1; i <= individual.Cities; i++) {
64        if (pdp == null || pdp.GetDemand(i) >= 0)
65          cities.Add(i);
66      }
67
68      if (cities.Count > 1 && individual.Tours.Count > 1) {
69        int city = cities[rand.Next(cities.Count)];
70        Tour oldTour = individual.Tours.Find(t => t.Stops.Contains(city));
71        int oldTourIndex = individual.Tours.IndexOf(oldTour);
72
73        int max = individual.Tours.Count;
74        if (individual.Tours.Count < problemInstance.Vehicles.Value)
75          max = max - 1;
76
77        int newTourIndex = rand.Next(max);
78        if (newTourIndex >= oldTourIndex)
79          newTourIndex++;
80
81        return new PotvinPDShiftMove(city, oldTourIndex, newTourIndex, individual);
82      } else {
83        return null;
84      }             
85    }
86
87    protected override PotvinPDShiftMove[] GenerateMoves(PotvinEncoding individual, IVRPProblemInstance problemInstance) {
88      List<PotvinPDShiftMove> result = new List<PotvinPDShiftMove>();
89
90      PotvinPDShiftMove move = Apply(individual, ProblemInstance, RandomParameter.ActualValue);
91      if (move != null)
92        result.Add(move);
93
94      return result.ToArray();
95    }
96  }
97}
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