//*-- Author :    Damir Buskulic   22/11/00

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// VVirtualNtuplePlayer                                                 //
//                                                                      //
// Abstract base class for VNtuple players                              //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "TROOT.h"
#include "VVirtualNtuplePlayer.h"

TClass  *VVirtualNtuplePlayer::fgPlayer = 0;

ClassImp(VVirtualNtuplePlayer)

//______________________________________________________________________________
  VVirtualNtuplePlayer *VVirtualNtuplePlayer::NtuplePlayer(VNtuple *obj)
{
   // Static function returning a pointer to a Ntuple player.
   // The player will process the specified obj. If the Ntuple player
   // does not exist a default player is created.

   if (!fgPlayer) {
   // if no player set yet, set VDBPlayer by default
      if (gROOT->LoadClass("VNtuplePlayer","libVNtuplePlayer")) return 0;
      VVirtualNtuplePlayer::SetPlayer("VNtuplePlayer");
      if (!fgPlayer) return 0;
   }
   //create an instance of the Ntuple player
   VVirtualNtuplePlayer *p = (VVirtualNtuplePlayer*)fgPlayer->New();
   if (p) p->SetNtuple(obj);
   return p;
}

//______________________________________________________________________________
  void VVirtualNtuplePlayer::SetPlayer(const char *player)
{
   // Static function to set an alternative Tree player.

   fgPlayer = gROOT->GetClass(player);
}

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