virtual Bool_t Init(Option_t* opt) = 0;
virtual Bool_t Init(TTree* tree, Option_t* opt) = 0;
virtual Bool_t BeginEvent(Long64_t entry) = 0;
+ virtual Bool_t GetEntry() = 0;
virtual Bool_t Notify(const char *path) = 0;
virtual Bool_t FinishEvent() = 0;
virtual Bool_t Terminate() = 0;