#ifndef VEGA_VVirtualNtuplePlayer
#define VEGA_VVirtualNtuplePlayer

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

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

#ifndef ROOT_TClass
#include "TClass.h"
#endif

class VNtuple;

class VVirtualNtuplePlayer : public TObject {

private:
   static TClass   *fgPlayer; //Pointer to DB player

public:
    VVirtualNtuplePlayer() { }
    virtual ~VVirtualNtuplePlayer() { }
    virtual Int_t       DrawGraph(const char *varexp, const char *selection, Option_t *option=""
                          ,Int_t nentries=1000000000, Int_t firstentry=0) = 0;
    virtual Int_t       DrawSeries(const char *varexp, const char *selection, Option_t *option=""
                          ,Int_t nentries=1000000000, Int_t firstentry=0) = 0;
    virtual void        SetNtuple(VNtuple *vnt) = 0;
        
    static VVirtualNtuplePlayer* NtuplePlayer(VNtuple *obj);
    static void                  SetPlayer(const char *player);

    ClassDef(VVirtualNtuplePlayer,0)  //Abstract interface for vntuple players
};

#endif