// @(#)root/base:$Name:  $:$Id: TVirtualFitter.cxx,v 1.2 2002/07/16 13:59:19 rdm Exp $
// Author: Rene Brun   31/08/99
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#include "TROOT.h"
#include "TVirtualFitter.h"
#include "TPluginManager.h"


TVirtualFitter *TVirtualFitter::fgFitter    = 0;
Int_t           TVirtualFitter::fgMaxpar    = 0;
Int_t           TVirtualFitter::fgMaxiter   = 5000;
Double_t        TVirtualFitter::fgPrecision = 1e-6;


ClassImp(TVirtualFitter)

//______________________________________________________________________________
 TVirtualFitter::~TVirtualFitter()
{
   // Cleanup virtual fitter.

   fgFitter = 0;
   fgMaxpar = 0;
}

//______________________________________________________________________________
 TVirtualFitter *TVirtualFitter::Fitter(TObject *obj, Int_t maxpar)
{
   // Static function returning a pointer to the current fitter.
   // If the fitter does not exist, the default TFitter is created.

   if (fgFitter && maxpar > fgMaxpar) {
      delete fgFitter;
      fgFitter = 0;
   }

   if (!fgFitter) {
      TPluginHandler *h;
      if ((h = gROOT->GetPluginManager()->FindHandler("TVirtualFitter"))) {
         if (h->LoadPlugin() == -1)
            return 0;
         fgFitter = (TVirtualFitter*) h->ExecPlugin(1, maxpar);
         fgMaxpar = maxpar;
      }
   }

   if (fgFitter) fgFitter->SetObjectFit(obj);
   return fgFitter;
}

//______________________________________________________________________________
 void TVirtualFitter::SetFitter(TVirtualFitter *fitter, Int_t maxpar)
{
   // Static function to set an alternative fitter

   fgFitter = fitter;
   fgMaxpar = maxpar;
}

//______________________________________________________________________________
 Int_t TVirtualFitter::GetMaxIterations()
{
   // Return the maximum number of iterations

   return fgMaxiter;
}

//______________________________________________________________________________
 Double_t TVirtualFitter::GetPrecision()
{
   // Return the fit relative precision

   return fgPrecision;
}

//______________________________________________________________________________
 void TVirtualFitter::SetMaxIterations(Int_t niter)
{
   // Set the maximum number of iterations

   fgMaxiter  = niter;
}

//______________________________________________________________________________
 void TVirtualFitter::SetPrecision(Double_t prec)
{
   // Set the fit relative precision

   fgPrecision = prec;
}