#ifndef ALIPHOSGETTER_H
#define ALIPHOSGETTER_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

//_________________________________________________________________________
//  A singleton that returns various objects 
//  Should be used on the analysis stage to avoid confusing between different
//  branches of reconstruction tree: e.g. reading RecPoints and TS made from 
//  another set of RecPoints.
// 
//  The objects are retrived from folders.  
//*-- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC KI & SUBATECH)
//    


// --- ROOT system ---
#include "TClonesArray.h"
#include <stdlib.h>
#include <iostream.h>

#include <TTree.h>
class TString ;
class TParticle ;
class TTask ;
class TFolder ; 

// --- Standard library ---

// --- AliRoot header files ---

#include <AliRun.h>
class AliPHOS ;
class AliPHOSGeometry ;
class AliPHOSHit ;
class AliPHOSDigit ;
class AliPHOSDigitizer ;
class AliPHOSSDigitizer ;
class AliPHOSEmcRecPoint ;
class AliPHOSCpvRecPoint ;
class AliPHOSClusterizer ;
class AliPHOSTrackSegment ;
class AliPHOSTrackSegmentMaker ;
class AliPHOSRecParticle ;
class AliPHOSPID ;

class AliPHOSGetter : public TObject {
  
 public:
  
  AliPHOSGetter(){ 
    // ctor: this is a singleton, the ctor should never be called but cint needs it as public
    cerr << "ERROR: AliPHOGetter is a singleton default ctor not callable" << endl ;
    abort() ; 
  } 
  AliPHOSGetter(const AliPHOSGetter & obj) {
    // cpy ctor requested by Coding Convention 
    // but not yet needed
    abort() ; 
  } 
  
  virtual ~AliPHOSGetter(){
    // dtor
  }
  
  Bool_t PostGeometry( void ) const ;  
  Bool_t PostHits(void ) const ;  
  Bool_t PostSDigits(      const char * name,  const char * file = 0) const ;  
  Bool_t PostDigits(       const char * name ) const ;  
  Bool_t PostRecPoints(    const char * name ) const ;  
  Bool_t PostTrackSegments(const char * name) const ;  
  Bool_t PostRecParticles( const char * name) const ;  

  Bool_t PostClusterizer( const char * name) const ;  
  Bool_t PostClusterizer(AliPHOSClusterizer * clu) const ;  
  Bool_t PostSDigitizer (AliPHOSSDigitizer * sdigitizer) const ;  
  Bool_t PostSDigitizer ( const char * name, const char * file ) const ;  
  Bool_t PostDigitizer (AliPHOSDigitizer * digitizer) const ;  
  Bool_t PostDigitizer  ( const char * name) const ;  
  Bool_t PostTrackSegmentMaker(AliPHOSTrackSegmentMaker * tsm) const ;  
  Bool_t PostTrackSegmentMaker(const char * name ) const ;  
  Bool_t PostPID  (AliPHOSPID * pid) const ;  
  Bool_t PostPID  (       const char * name ) const ;  
  Bool_t PostQA   (       const char * headerFile ) const ;
  

  void   Event(const Int_t event, const char * opt = "HSDRQ") ;    
  void   Track(Int_t itrack) ;

  //Method to be used when digitizing under AliRunDigitizer, who opens all files etc.
  void   ReadTreeS(TTree * treeS,Int_t input) ;
  
  Int_t  EventNumber()       { return (Int_t) gAlice->GetEvNumber() ; }
  Int_t  MaxEvent()          { return (Int_t) gAlice->TreeE()->GetEntries() ; }
  static AliPHOSGetter * GetInstance(const char* headerFile,
				     const char* branchTitle = "Default" ) ; 
  static AliPHOSGetter *   GetInstance() ; 

  const  AliPHOS *         PHOS() const ;  
  const  AliPHOSGeometry * PHOSGeometry() const  ; 
   // Alarms
  TFolder * Alarms(const char * name = 0) const { return (TFolder*)(ReturnO("Alarms", name)) ; }

  // QA Tasks
  TTask * QATasks(const char * name = 0) const { return (TTask*)(ReturnT("QATasks", name)) ; }

  // Hits
        TClonesArray *  Hits(void) const { return (TClonesArray*)(ReturnO("Hits")) ; }

  // SDigits
        TClonesArray *  SDigits(const char * name = 0, const char * file=0) const 
	                              { return (TClonesArray*)(ReturnO("SDigits", name, file)) ; }

   AliPHOSSDigitizer *  SDigitizer(const char * name =0) const 
                                      { return ((AliPHOSSDigitizer*)(ReturnT("SDigitizer", name))) ; }

  // Digits
        TClonesArray *  Digits(const char * name = 0)   const 
                             { return (TClonesArray*)(ReturnO("Digits", name)) ; }
    AliPHOSDigitizer *  Digitizer(const char * name =0) const 
                             { return (AliPHOSDigitizer*)(ReturnT("Digitizer", name)) ; }

  // RecPoints
  TObjArray * EmcRecPoints(const char * name = 0) const { 
              return (TObjArray*)(ReturnO("EmcRecPoints", name)) ; }
  TObjArray * CpvRecPoints(const char * name = 0) const { 
              return (TObjArray*)(ReturnO("CpvRecPoints", name)) ; }

  AliPHOSClusterizer * Clusterizer (const char * name =0) const 
              { return (AliPHOSClusterizer*)(ReturnT("Clusterizer", name)) ; }

  // TrackSegments
  TClonesArray * TrackSegments(const char * name = 0) const 
                   { return (TClonesArray*)(ReturnO("TrackSegments", name)) ; }
  AliPHOSTrackSegmentMaker * TrackSegmentMaker (const char * name =0) const 
                   { return (AliPHOSTrackSegmentMaker*)(ReturnT("TrackSegmentMaker", name)) ; }

  // RecParticles
  TClonesArray * RecParticles(const char * name = 0) const  
                   { return (TClonesArray*)(ReturnO("RecParticles", name)) ; }
    AliPHOSPID * PID(const char * name =0) const 
                   { return (AliPHOSPID*)(ReturnT("PID", name)) ; }

  // Primaries
  const TParticle *           Primary(Int_t index) const ;
  const Int_t                 NPrimaries()const { return fNPrimaries; }

  void  SetDebug(Int_t level) {fDebug = level;} // Set debug level

  AliPHOSGetter & operator = (const AliPHOSGetter & ) {
    // assignement operator requested by coding convention, but not needed
    abort() ;
    return *this ; 
  }
  
 private:

  AliPHOSGetter(const char* headerFile, const char* branchTitle ="Default") ; 
  void CreateWhiteBoard() const ; 
  const TObject * ReturnO(TString what, TString name=0, TString file=0) const ; 
  const TTask * ReturnT(TString what,TString name=0) const ; 
  void DefineBranchTitles(char* branch, char* branchTitle) ;
  void ReadTreeD() ;
  void ReadTreeH() ;
  void ReadTreeR() ;
  void ReadTreeS(Int_t event) ;
  void ReadTreeQA() ;
  void ReadPrimaries() ;

  TClonesArray ** HitsRef(void) const ;
  TClonesArray ** SDigitsRef(const char * name, const char * file = 0 ) const;
  TClonesArray ** DigitsRef (const char * name)   const ;
  TObjArray    ** EmcRecPointsRef (const char * name) const ;
  TObjArray    ** CpvRecPointsRef (const char * name) const ;
  TClonesArray ** TrackSegmentsRef(const char * name)   const ;
  TClonesArray ** RecParticlesRef (const char * name)   const ;

  AliPHOSSDigitizer        ** SDigitizerRef (const char * name) const ; 
  AliPHOSDigitizer         ** DigitizerRef  (const char * name) const ; 
  AliPHOSClusterizer       ** ClusterizerRef(const char * name) const ; 
  AliPHOSTrackSegmentMaker ** TSMakerRef    (const char * name) const ; 
  AliPHOSPID               ** PIDRef        (const char * name) const ; 

 private:

  TString        fHeaderFile ;        //! File in which gAlice lives
  TString        fBranchTitle ;       //!
  TString        fTrackSegmentsTitle ;//! 
  TString        fRecPointsTitle ;    //!
  TString        fRecParticlesTitle ; //!
  TString        fDigitsTitle ;       //!
  TString        fSDigitsTitle ;      //!

  Int_t          fDebug ;             // Debug level

  Int_t          fNPrimaries ;        //! # of primaries
  
  TObjArray *    fPrimaries ;         //! list of lists of primaries-for the case of mixing

  static AliPHOSGetter * fgObjGetter; // pointer to the unique instance of the singleton 

  ClassDef(AliPHOSGetter,1)  // Algorithm class that provides methods to retrieve objects from a list knowing the index 

};

#endif // AliPHOSGETTER_H