// @(#)root/minuit2:$Id$
// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005  

/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
 *                                                                    *
 **********************************************************************/

#ifndef ROOT_Minuit2_VariableMetricBuilder
#define ROOT_Minuit2_VariableMetricBuilder

#include "Minuit2/MnConfig.h"
#include "Minuit2/MinimumBuilder.h"
#include "Minuit2/VariableMetricEDMEstimator.h"
#include "Minuit2/DavidonErrorUpdator.h"

#include <vector>

namespace ROOT {

   namespace Minuit2 {

/**
   Build (find) function minimum using the Variable Metric method (MIGRAD) 
 */
class VariableMetricBuilder : public MinimumBuilder {

public:


   VariableMetricBuilder() : fEstimator(VariableMetricEDMEstimator()), 
                             fErrorUpdator(DavidonErrorUpdator()) {}

   ~VariableMetricBuilder() {}

   virtual FunctionMinimum Minimum(const MnFcn&, const GradientCalculator&, const MinimumSeed&, const MnStrategy&, unsigned int, double) const;

   FunctionMinimum Minimum(const MnFcn&, const GradientCalculator&, const MinimumSeed&, std::vector<MinimumState> &, unsigned int, double) const;

   const VariableMetricEDMEstimator& Estimator() const {return fEstimator;}
   const DavidonErrorUpdator& ErrorUpdator() const {return fErrorUpdator;}
   
   void AddResult(std::vector<MinimumState>& result, const MinimumState & state, bool store = false) const;

private:

   VariableMetricEDMEstimator fEstimator;
   DavidonErrorUpdator fErrorUpdator;
};

  }  // namespace Minuit2

}  // namespace ROOT

#endif  // ROOT_Minuit2_VariableMetricBuilder