source: branches/VRP/HeuristicLab.Problems.VehicleRouting/3.4/ProblemInstances/VRPEvaluator.cs @ 4501

#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 <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HeuristicLab.Problems.VehicleRouting.Interfaces;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Core;
using HeuristicLab.Parameters;
using HeuristicLab.Data;
using HeuristicLab.Optimization;
using HeuristicLab.PluginInfrastructure;
using HeuristicLab.Problems.VehicleRouting.Variants;
using HeuristicLab.Problems.VehicleRouting.Encodings;

namespace HeuristicLab.Problems.VehicleRouting.ProblemInstances {
  [Item("VRPEvaluator", "Represents a VRP evaluator.")]
  [StorableClass]
  public abstract class VRPEvaluator: VRPOperator, IVRPEvaluator {
    public ILookupParameter<IVRPEncoding> VRPToursParameter {
      get { return (ILookupParameter<IVRPEncoding>)Parameters["VRPTours"]; }
    }
    
    #region ISingleObjectiveEvaluator Members
    public ILookupParameter<DoubleValue> QualityParameter {
      get { return (ILookupParameter<DoubleValue>)Parameters["Quality"]; }
    }
    #endregion

    public ILookupParameter<DoubleValue> DistanceParameter {
      get { return (ILookupParameter<DoubleValue>)Parameters["Distance"]; }
    }
    public ILookupParameter<DoubleValue> VehcilesUtilizedParameter {
      get { return (ILookupParameter<DoubleValue>)Parameters["VehiclesUtilized"]; }
    }
    
    [StorableConstructor]
    protected VRPEvaluator(bool deserializing) : base(deserializing) { }

    public VRPEvaluator() {
      Parameters.Add(new LookupParameter<IVRPEncoding>("VRPTours", "The VRP tours which should be evaluated."));

      Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The evaluated quality of the VRP solution."));
      Parameters.Add(new LookupParameter<DoubleValue>("Distance", "The distance."));
      Parameters.Add(new LookupParameter<DoubleValue>("VehiclesUtilized", "The number of vehicles utilized."));
    }

    protected virtual VRPEvaluation CreateTourEvaluation() {
      return new VRPEvaluation();
    }

    protected abstract void EvaluateTour(VRPEvaluation eval, IVRPProblemInstance instance, Tour tour);

    protected virtual void InitResultParameters() {
      QualityParameter.ActualValue = new DoubleValue(0);
      VehcilesUtilizedParameter.ActualValue = new DoubleValue(0);
      DistanceParameter.ActualValue = new DoubleValue(0);
    }

    protected virtual void UpdateResultParameters(VRPEvaluation tourEvaluation) {
      QualityParameter.ActualValue.Value += tourEvaluation.Quality;
      VehcilesUtilizedParameter.ActualValue.Value += tourEvaluation.VehicleUtilization;
      DistanceParameter.ActualValue.Value += tourEvaluation.Distance;
    }

    private VRPEvaluation EvaluateTour(IVRPProblemInstance instance, Tour tour) {
      VRPEvaluation evaluation = CreateTourEvaluation();
      EvaluateTour(evaluation, instance, tour);
      return evaluation;
    }

    #region IVRPEvaluator Members

    public bool Feasible(VRPEvaluation evaluation) {
      return evaluation.Penalty < double.Epsilon;
    }

    public VRPEvaluation Evaluate(IVRPProblemInstance instance, IVRPEncoding solution) {
      VRPEvaluation evaluation = CreateTourEvaluation();

      foreach (Tour tour in solution.GetTours()) {
        EvaluateTour(evaluation, instance, tour);
      }

      return evaluation;
    }

    public VRPEvaluation Evaluate(IVRPProblemInstance instance, Tour tour) {
      return EvaluateTour(instance, tour);
    }

    public override IOperation Apply() {
      double quality = 0;
      InitResultParameters();

      foreach (Tour tour in VRPToursParameter.ActualValue.GetTours()) {
        VRPEvaluation tourEvaluation = EvaluateTour(ProblemInstance, tour);
        quality += tourEvaluation.Quality;

        UpdateResultParameters(tourEvaluation);
      }

      QualityParameter.ActualValue = new DoubleValue(quality);

      return base.Apply();
    }

    #endregion
  }
}