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

// $Id$
 
#include "Riostream.h"
#include <math.h>
 
#include "TObject.h"
#include "TObjArray.h"

#include "Ali4Vector.h"
#include "AliTrack.h"
 
class AliJet : public TObject,public Ali4Vector
{
 public:
  AliJet();                          // Default constructor
  AliJet(Int_t n);                   // Create a Jet to hold initially n Tracks
  ~AliJet();                         // Default destructor
  virtual void SetOwner(Bool_t own=kTRUE);// Set ownership of all added objects
  AliJet(AliJet& j);                 // Copy constructor
  void Reset();                      // Reset all values
  void AddTrack(AliTrack& t,Int_t copy=1);// Add a track to the jet
  void AddTrack(AliTrack* t,Int_t copy=1) { AddTrack(*t,copy); }
  void Info(TString f);              // Print jet information in coordinate frame f 
  void List(TString f="car");        // Print jet prim. track information for coord. frame f
  void ListAll(TString f="car");     // Print jet prim. and decay track information for coord. frame f
  Double_t GetEnergy();              // Provide the total jet energy
  Double_t GetMomentum();            // Provide the value of the total jet 3-momentum
  Ali3Vector Get3Momentum();         // Provide the total jet 3-momentum
  Double_t GetInvmass();             // Provide the invariant mass  
  Float_t GetCharge();               // Provide the total charge of the jet
  Int_t GetNtracks();                // Return the number of tracks in the jet
  AliTrack* GetTrack(Int_t i);       // Provide i-th track of the jet (1=first track)
  AliTrack* GetIdTrack(Int_t id);    // Provide the track with user identifier "id"
  Double_t GetPt();                  // Provide trans. momentum w.r.t. z-axis
  Double_t GetPl();                  // Provide long. momentum w.r.t. z-axis
  Double_t GetEt();                  // Provide trans. energy w.r.t. z-axis
  Double_t GetEl();                  // Provide long. energy w.r.t. z-axis
  Double_t GetMt();                  // Provide trans. mass w.r.t. z-axis
  Double_t GetRapidity();            // Provide rapidity value w.r.t. z-axis
  void SetTrackCopy(Int_t j);        // (De)activate creation of private copies in fTracks
  Int_t GetTrackCopy();              // Provide TrackCopy flag value      
  void SetId(Int_t id);              // Set the user defined identifier
  Int_t GetId();                     // Provide the user defined identifier

 protected:
  void Init();               // Initialisation of pointers etc...
  void SetNtinit(Int_t n=2); // Set the initial max. number of tracks for this Jet
  Int_t fNtinit;             // The initial max. number of tracks for this jet
  Int_t fNtmax;              // The maximum number of tracks for this Jet
  Float_t fQ;                // The total charge of the jet 
  Int_t fNtrk;               // The number of tracks in the jet
  TObjArray* fTracks;        // Array to hold the pointers to the tracks of the jet
  Int_t fTrackCopy;          // Flag to denote creation of private copies in fTracks
  Int_t fUserId;             // The user defined identifier
 
 ClassDef(AliJet,2) // Creation and investigation of a jet of particle tracks.
};
#endif