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//
// $Id: Lepjets_Event_Lep.h,v 1.1 2011/05/26 09:46:53 mseidel Exp $
//
// File: hitfit/Lepjets_Event_Lep.h
// Purpose: Represent a `lepton' in a Lepjets_Event class.
// Created: Jul, 2000, sss, based on run 1 mass analysis code.
//
// For each lepton, we store:
//
//   - 4-momentum
//   - type code
//   - Vector_Resolution
//
// CMSSW File      : interface/Lepjets_Event_Lep.h
// Original Author : Scott Stuart Snyder <snyder@bnl.gov> for D0
// Imported to CMSSW by Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>
//


#ifndef HITFIT_LEPJETS_EVENT_LEP_H
#define HITFIT_LEPJETS_EVENT_LEP_H


#include "TopQuarkAnalysis/TopHitFit/interface/fourvec.h"
#include "TopQuarkAnalysis/TopHitFit/interface/Vector_Resolution.h"
#include <iosfwd>


namespace hitfit {

enum Lepton_Labels {
  lepton_label = 1,  // generic lepton
  electron_label = 2,
  muon_label = 3
};


class Lepjets_Event_Lep
//
// Purpose: Represent a `lepton' in a Lepjets_Event class.
//
{
public:
  // Constructor.
  Lepjets_Event_Lep (const Fourvec& p,
                     int type,
                     const Vector_Resolution& res);

  // Access the 4-momentum.
  Fourvec& p ();

  const Fourvec& p () const;

  // Access the type code.
  int& type ();

  int type () const;

  // Access the resolution.
  const Vector_Resolution& res () const;

  Vector_Resolution& res ();

  // Return resolutions for this object.
  double p_sigma () const;

  double eta_sigma () const;

  double phi_sigma () const;

  // Smear this object.
  // If SMEAR_DIR is false, smear the momentum only.
  void smear (CLHEP::HepRandomEngine& engine, bool smear_dir = false);

  // Dump out this object.
  std::ostream& dump (std::ostream& s, bool full = false) const;

  // Sort on pt.
  bool operator< (const Lepjets_Event_Lep& x) const;


private:
  // The object state.

  Fourvec _p;

  int _type;

  Vector_Resolution _res;
};


// Print the object.
std::ostream& operator<< (std::ostream& s, const Lepjets_Event_Lep& ev);


} // namespace hitfit


#endif // not HITFIT_LEPJETS_EVENT_LEP_H