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


/* $Id$ */

//-------------------------------------------------------------------------
//                          Class AliMixedEvent
// VEvent which is the container of several VEvents 
// Use Case: Event Mixing     
// Origin: Andreas Morsch, CERN, Andreas.Morsch@cern.ch 
//-------------------------------------------------------------------------

#include "AliVEvent.h"
#include "AliVVertex.h"
#include <TList.h>
#include <TObjArray.h>

class AliMixedEvent : public AliVEvent {

public:
    
    AliMixedEvent();
    virtual ~AliMixedEvent() {Reset();} 
    AliMixedEvent(const AliMixedEvent& vEvnt); 
    AliMixedEvent& operator=(const AliMixedEvent& vEvnt);
    
    // Services from VEvent
    virtual void AddObject(TObject* /*obj*/) {;}
    virtual TObject* FindListObject(const char* /*name*/) {return 0;}
    virtual TList* GetList() const {return 0;}
    virtual void CreateStdContent() {;}
    virtual void GetStdContent() {;}
    virtual void ReadFromTree(TTree* /*tree*/, Option_t* /*opt*/) {;} 
    virtual void WriteToTree(TTree* /*tree*/) const {;}
    virtual void SetStdNames() {;} 
    virtual void Print(Option_t * /*option*/) const  {;} 
    // Specific Services
    virtual void AddEvent(AliVEvent* evt);
    virtual void SetPrimaryVertex(AliVVertex* newVertex) {fMeanVertex = newVertex;}
    virtual void Reset();
    virtual void Init();
    const AliVVertex* GetEventVertex(Int_t i) const;
    
    // Header
    virtual AliVHeader* GetHeader() const {return 0;}

    // Delegated methods for fESDRun or AODHeader
  
    virtual void     SetRunNumber(Int_t /*n*/)         {;} 
    virtual void     SetPeriodNumber(UInt_t /*n*/)     {;} 
    virtual void     SetMagneticField(Double_t /*mf*/) {;} 
    
    virtual Int_t    GetRunNumber()     const  {return -999 ;} 
    virtual UInt_t   GetPeriodNumber()  const  {return    0 ;} 
    virtual Double_t GetMagneticField() const;
    
    
    virtual Double_t GetDiamondX() const {return -999.;}
    virtual Double_t GetDiamondY() const {return -999.;}
    virtual void     GetDiamondCovXY(Float_t cov[3]) const
	{cov[0]=-999.; return;}

  // Delegated methods for fHeader
    virtual void      SetOrbitNumber(UInt_t /*n*/)        {;} 
    virtual void      SetBunchCrossNumber(UShort_t /*n*/) {;}
    virtual void      SetEventType(UInt_t /*eventType*/)  {;}
    virtual void      SetTriggerMask(ULong64_t /*n*/)     {;}
    virtual void      SetTriggerCluster(UChar_t /*n*/)    {;}

    virtual UInt_t    GetOrbitNumber()      const  {return    0;}
    virtual UShort_t  GetBunchCrossNumber() const  {return    0;}
    virtual UInt_t    GetEventType()        const  {return    0;}
    virtual ULong64_t GetTriggerMask()      const  {return    0;}
    virtual UChar_t   GetTriggerCluster()   const  {return    0;}
    
    virtual Double_t  GetZDCN1Energy()            const {return -999.;}
    virtual Double_t  GetZDCP1Energy()            const {return -999.;}
    virtual Double_t  GetZDCN2Energy()            const {return -999.;}
    virtual Double_t  GetZDCP2Energy()            const {return -999.;}
    virtual Double_t  GetZDCEMEnergy(Int_t /*i*/) const {return -999.;}
 
  // Tracks
    virtual AliVParticle *GetTrack(Int_t i)    const;
    virtual Int_t        GetNumberOfTracks()   const {return fNumberOfTracks;}
    virtual Int_t        GetNumberOfV0s()      const {return -999;}
    virtual Int_t        GetNumberOfCascades() const {return -999;}
    
    virtual Int_t        EventIndex(Int_t itrack);

  // Primary vertex
    virtual const AliVVertex   *GetPrimaryVertex() const {return fMeanVertex;}
    virtual Bool_t ComputeVtx(TObjArray *vertices, Double_t *pos,Double_t *sig,Int_t *nContributors);
private:
    TList   fEventList;         //! List of Events
    Int_t   fNEvents;           //! Number of Events 
    Int_t   fNumberOfTracks;    //! Total number of tracks
    Int_t*  fNTracksCumul;      //! Cumulant
    AliVVertex* fMeanVertex;    //! Mean vertex
    
    ClassDef(AliMixedEvent, 0)  // Container for mixed events
};
#endif