source: branches/GP.Grammar.Editor/HeuristicLab.Problems.VehicleRouting/3.3/Encodings/Alba/Crossovers/AlbaPermutationCrossover.cs @ 6618

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
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 * HeuristicLab is free software: you can redistribute it and/or modify
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 * GNU General Public License for more details.
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#endregion

using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Encodings.PermutationEncoding;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Problems.VehicleRouting.Encodings.Alba {
  [Item("AlbaPermutationCrossover", "An operator which crosses two VRP representations using a standard permutation operator.  It is implemented as described in Alba, E. and Dorronsoro, B. (2004). Solving the Vehicle Routing Problem by Using Cellular Genetic Algorithms.")]
  [StorableClass]
  public sealed class AlbaPermutationCrossover : AlbaCrossover {
    public IValueLookupParameter<IPermutationCrossover> InnerCrossoverParameter {
      get { return (IValueLookupParameter<IPermutationCrossover>)Parameters["InnerCrossover"]; }
    }

    [StorableConstructor]
    private AlbaPermutationCrossover(bool deserializing) : base(deserializing) { }
    private AlbaPermutationCrossover(AlbaPermutationCrossover original, Cloner cloner)
      : base(original, cloner) {
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new AlbaPermutationCrossover(this, cloner);
    }
    public AlbaPermutationCrossover()
      : base() {
      Parameters.Add(new ValueLookupParameter<IPermutationCrossover>("InnerCrossover", "The permutation crossover.", new EdgeRecombinationCrossover()));
    }

    protected override AlbaEncoding Crossover(IRandom random, AlbaEncoding parent1, AlbaEncoding parent2) {
      //note - the inner crossover is called here and the solution is converted to an alba representation
      //some refactoring should be done here in the future - the crossover operation should be called directly

      if (parent1.Length == parent2.Length) {
        InnerCrossoverParameter.ActualValue.ParentsParameter.ActualName = ParentsParameter.ActualName;
        IAtomicOperation op = this.ExecutionContext.CreateOperation(
          InnerCrossoverParameter.ActualValue, this.ExecutionContext.Scope);
        op.Operator.Execute((IExecutionContext)op, CancellationToken);

        string childName = InnerCrossoverParameter.ActualValue.ChildParameter.ActualName;
        if (ExecutionContext.Scope.Variables.ContainsKey(childName)) {
          Permutation permutation = ExecutionContext.Scope.Variables[childName].Value as Permutation;
          ExecutionContext.Scope.Variables.Remove(childName);

          return new AlbaEncoding(permutation, Cities);
        } else
          return null;
      } else {
        return parent1.Clone() as AlbaEncoding;
      }
    }
  }
}