// @(#)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_MinimumBuilder
#define ROOT_Minuit2_MinimumBuilder

#ifndef ROOT_Minuit2_MnTraceObject
#include "Minuit2/MnTraceObject.h"
#endif

namespace ROOT {

   namespace Minuit2 {


class FunctionMinimum;
class MnFcn;
class GradientCalculator;
class MinimumSeed;
class MinimumState;
class MnStrategy;

class MinimumBuilder {

public:
  
   MinimumBuilder();

   virtual ~MinimumBuilder() {}

   virtual FunctionMinimum Minimum(const MnFcn&, const GradientCalculator&, const MinimumSeed&, const MnStrategy&, unsigned int, double) const = 0;

   int StorageLevel() const {  return fStorageLevel; }
   int PrintLevel() const { return fPrintLevel; }

   bool TraceIter() const { return (fTracer); }
   MnTraceObject * TraceObject() const { return (fTracer); }

   virtual void SetPrintLevel(int level) { fPrintLevel = level;}
   virtual void SetStorageLevel(int level) { fStorageLevel = level;}

   // set trace object (user manages it)
   virtual void SetTraceObject(MnTraceObject & obj) {
      fTracer = &obj;
   }

   void TraceIteration(int iter, const MinimumState & state) const {
      if (fTracer) (*fTracer)(iter, state); 
   }

private: 

   int fPrintLevel; 
   int fStorageLevel;

   MnTraceObject * fTracer; //! tracer object (it is managed by user)

};

  }  // namespace Minuit2

}  // namespace ROOT

#endif  // ROOT_Minuit2_MinimumBuilder