source: branches/ParallelEngine/HeuristicLab.Problems.VehicleRouting/3.3/Encodings/Alba/Crossovers/AlbaPermutationCrossover.cs @ 5177

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
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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(IExecutionContext context, IRandom random, AlbaEncoding parent1, AlbaEncoding parent2) {
      //note - the inner crossover is called here and the result is converted to an alba representation
      //some refactoring should be done here in the future - the crossover operation should be called directly

      InnerCrossoverParameter.ActualValue.ParentsParameter.ActualName = ParentsParameter.ActualName;
      IAtomicOperation op = context.CreateOperation(
        InnerCrossoverParameter.ActualValue, context.Scope);
      op.Operator.Execute((IExecutionContext)op);

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

        return new AlbaEncoding(permutation, Cities);
      } else
        return null;
    }
  }
}