source: branches/2936_GQAPIntegration/HeuristicLab.Problems.GeneralizedQuadraticAssignment/3.3/Operators/Shakers/NMoveShakingOperator.cs

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2018 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
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 * (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 <http://www.gnu.org/licenses/>.
 */
#endregion

using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Encodings.IntegerVectorEncoding;
using HeuristicLab.Operators;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HEAL.Attic;

namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Operators {
  [Item("NMoveShakingOperator", "Performs a number of shaking operations that increase in strength.")]
  [StorableType("22D9F959-9BAB-497D-B593-FF19BD8CE9AB")]
  public class NMoveShakingOperator : SingleSuccessorOperator, IProblemInstanceAwareGQAPOperator,
    IAssignmentAwareGQAPOperator, IMultiNeighborhoodShakingOperator, IStochasticOperator {


    public ILookupParameter<GQAPInstance> ProblemInstanceParameter {
      get { return (ILookupParameter<GQAPInstance>)Parameters["ProblemInstance"]; }
    }
    public ILookupParameter<IntegerVector> AssignmentParameter {
      get { return (ILookupParameter<IntegerVector>)Parameters["Assignment"]; }
    }
    public IValueLookupParameter<IntValue> CurrentNeighborhoodIndexParameter {
      get { return (IValueLookupParameter<IntValue>)Parameters["CurrentNeighborhoodIndex"]; }
    }
    public ILookupParameter<IntValue> NeighborhoodCountParameter {
      get { return (ILookupParameter<IntValue>)Parameters["NeighborhoodCount"]; }
    }
    public ILookupParameter<IRandom> RandomParameter {
      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
    }

    [StorableConstructor]
    protected NMoveShakingOperator(StorableConstructorFlag _) : base(_) { }
    protected NMoveShakingOperator(NMoveShakingOperator original, Cloner cloner) : base(original, cloner) { }
    public NMoveShakingOperator() {
      Parameters.Add(new LookupParameter<GQAPInstance>("ProblemInstance", GQAP.ProblemInstanceDescription));
      Parameters.Add(new LookupParameter<IntegerVector>("Assignment", GQAPSolutionCreator.AssignmentDescription));
      Parameters.Add(new ValueLookupParameter<IntValue>("CurrentNeighborhoodIndex", "The index of the operator that should be applied (k)."));
      Parameters.Add(new LookupParameter<IntValue>("NeighborhoodCount", "The number of operators that are available."));
      Parameters.Add(new LookupParameter<IRandom>("Random", "The random number generator to use."));
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new NMoveShakingOperator(this, cloner);
    }

    public override IOperation Apply() {
      var random = RandomParameter.ActualValue;
      var assignment = AssignmentParameter.ActualValue;
      var capacities = ProblemInstanceParameter.ActualValue.Capacities;

      if (NeighborhoodCountParameter.ActualValue == null)
        NeighborhoodCountParameter.ActualValue = new IntValue(assignment.Length);
      else NeighborhoodCountParameter.ActualValue.Value = assignment.Length;

      int index = CurrentNeighborhoodIndexParameter.ActualValue.Value;

      var move = StochasticNMoveSingleMoveGenerator.GenerateUpToN(random, assignment, index + 1, capacities);
      NMoveMaker.Apply(assignment, move);

      return base.Apply();
    }
  }
}