SimCluster.h

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#ifndef SimDataFormats_SimCluster_h
#define SimDataFormats_SimCluster_h

#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
#include "DataFormats/Math/interface/LorentzVector.h"
#include "DataFormats/Math/interface/Point3D.h"
#include "DataFormats/Math/interface/Vector3D.h"
#include "SimDataFormats/CaloHit/interface/PCaloHit.h"
#include "SimDataFormats/Track/interface/SimTrack.h"
#include <vector>

//
// Forward declarations
//
class SimTrack;
class EncodedEventId;

class SimCluster {
  friend std::ostream &operator<<(std::ostream &s, SimCluster const &tp);

public:
  typedef int Charge;                                       
  typedef math::XYZTLorentzVectorD LorentzVector;           
  typedef math::PtEtaPhiMLorentzVector PolarLorentzVector;  
  typedef math::XYZPointD Point;                            
  typedef math::XYZVectorD Vector;                          

  typedef reco::GenParticleRefVector::iterator genp_iterator;
  typedef std::vector<SimTrack>::const_iterator g4t_iterator;

  SimCluster();

  SimCluster(const SimTrack &simtrk);
  SimCluster(EncodedEventId eventID, uint32_t particleID);  // for PU

  // destructor
  ~SimCluster();

  int pdgId() const {
    if (genParticles_.empty())
      return g4Tracks_[0].type();
    else
      return (*genParticles_.begin())->pdgId();
  }

  EncodedEventId eventId() const { return event_; }

  uint64_t particleId() const { return particleId_; }

  // Setters for G4 and reco::GenParticle
  void addGenParticle(const reco::GenParticleRef &ref) { genParticles_.push_back(ref); }
  void addG4Track(const SimTrack &t) { g4Tracks_.push_back(t); }
  genp_iterator genParticle_begin() const { return genParticles_.begin(); }
  genp_iterator genParticle_end() const { return genParticles_.end(); }
  g4t_iterator g4Track_begin() const { return g4Tracks_.begin(); }
  g4t_iterator g4Track_end() const { return g4Tracks_.end(); }

  // Getters for Embd and Sim Tracks
  const reco::GenParticleRefVector &genParticles() const { return genParticles_; }
  // Only for clusters from the signal vertex
  const std::vector<SimTrack> &g4Tracks() const { return g4Tracks_; }

  float charge() const { return g4Tracks_[0].charge(); }
  int threeCharge() const { return lrintf(3.f * charge()); }

  const math::XYZTLorentzVectorF &p4() const { return theMomentum_; }

  math::XYZVectorF momentum() const { return p4().Vect(); }

  math::XYZVectorF boostToCM() const { return p4().BoostToCM(); }

  float p() const { return p4().P(); }

  float energy() const { return p4().E(); }

  float et() const { return p4().Et(); }

  float mass() const { return p4().M(); }

  float massSqr() const { return pow(mass(), 2); }

  float mt() const { return p4().Mt(); }

  float mtSqr() const { return p4().Mt2(); }

  float px() const { return p4().Px(); }

  float py() const { return p4().Py(); }

  float pz() const { return p4().Pz(); }

  float pt() const { return p4().Pt(); }

  float phi() const { return p4().Phi(); }

  float theta() const { return p4().Theta(); }

  float eta() const { return p4().Eta(); }

  float rapidity() const { return p4().Rapidity(); }

  float y() const { return rapidity(); }

  int status() const { return genParticles_.empty() ? -99 : (*genParticles_[0]).status(); }

  static const unsigned int longLivedTag;  

  bool longLived() const { return status() & longLivedTag; }

  int numberOfSimHits() const { return nsimhits_; }

  int numberOfRecHits() const { return hits_.size(); }

  void addRecHitAndFraction(uint32_t hit, float fraction) {
    hits_.emplace_back(hit);
    fractions_.emplace_back(fraction);
  }

  void addHitEnergy(float energy) { energies_.emplace_back(energy); }

  std::vector<std::pair<uint32_t, float>> hits_and_fractions() const {
    std::vector<std::pair<uint32_t, float>> result;
    for (size_t i = 0; i < hits_.size(); ++i) {
      result.emplace_back(hits_[i], fractions_[i]);
    }
    return result;
  }

  std::vector<std::pair<uint32_t, float>> hits_and_energies() const {
    assert(hits_.size() == energies_.size());
    std::vector<std::pair<uint32_t, float>> result;
    result.reserve(hits_.size());
    for (size_t i = 0; i < hits_.size(); ++i) {
      result.emplace_back(hits_[i], energies_[i]);
    }
    return result;
  }

  void clearHitsAndFractions() {
    std::vector<uint32_t>().swap(hits_);
    std::vector<float>().swap(fractions_);
  }

  void clearHitsEnergy() { std::vector<float>().swap(energies_); }

  float simEnergy() const { return simhit_energy_; }

  void addSimHit(const PCaloHit &hit) {
    simhit_energy_ += hit.energy();
    ++nsimhits_;
  }

protected:
  uint64_t nsimhits_{0};
  EncodedEventId event_;

  uint32_t particleId_{0};
  float simhit_energy_{0.f};
  std::vector<uint32_t> hits_;
  std::vector<float> fractions_;
  std::vector<float> energies_;

  math::XYZTLorentzVectorF theMomentum_;

  std::vector<SimTrack> g4Tracks_;
  reco::GenParticleRefVector genParticles_;
};

#endif  // SimDataFormats_SimCluster_H