jetConverters.h

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#ifndef RecoJets_FFTJetAlgorithms_jetConverters_h
#define RecoJets_FFTJetAlgorithms_jetConverters_h

#include "fftjet/RecombinedJet.hh"

#include "DataFormats/JetReco/interface/FFTJet.h"
#include "RecoJets/FFTJetAlgorithms/interface/fftjetTypedefs.h"

namespace fftjetcms {
  // The function below makes a storable FFTJet
  template <class Real>
  reco::FFTJet<Real> jetToStorable(const fftjet::RecombinedJet<VectorLike>& jet);

  // The function below restores the original RecombinedJet object
  template <class Real>
  fftjet::RecombinedJet<VectorLike> jetFromStorable(const reco::FFTJet<Real>& jet);
}  // namespace fftjetcms

//
//  Implementation follows
//

namespace fftjetcms {
  template <class Real>
  reco::FFTJet<Real> jetToStorable(const fftjet::RecombinedJet<VectorLike>& jet) {
    typedef reco::PattRecoPeak<Real> StoredPeak;

    double hessian[3] = {0., 0., 0.};
    const fftjet::Peak& peak(jet.precluster());
    peak.hessian(hessian);

    return reco::FFTJet<Real>(StoredPeak(peak.eta(),
                                         peak.phi(),
                                         peak.magnitude(),
                                         hessian,
                                         peak.driftSpeed(),
                                         peak.magSpeed(),
                                         peak.lifetime(),
                                         peak.scale(),
                                         peak.nearestNeighborDistance(),
                                         peak.clusterRadius(),
                                         peak.clusterSeparation(),
                                         peak.splitTime(),
                                         peak.mergeTime()),
                              jet.vec(),
                              jet.ncells(),
                              jet.etSum(),
                              jet.centroidEta(),
                              jet.centroidPhi(),
                              jet.etaWidth(),
                              jet.phiWidth(),
                              jet.etaPhiCorr(),
                              jet.fuzziness(),
                              jet.convergenceDistance(),
                              jet.recoScale(),
                              jet.recoScaleRatio(),
                              jet.membershipFactor(),
                              jet.code(),
                              jet.status());
  }

  template <class Real>
  fftjet::RecombinedJet<VectorLike> jetFromStorable(const reco::FFTJet<Real>& jet) {
    typedef reco::PattRecoPeak<Real> StoredPeak;
    typedef fftjet::RecombinedJet<VectorLike> RecoFFTJet;

    double hessian[3] = {0., 0., 0.};
    const StoredPeak& p(jet.f_precluster());
    p.hessian(hessian);
    const double pileupPt = jet.f_pileup().Pt();

    fftjet::Peak peak(p.eta(),
                      p.phi(),
                      p.magnitude(),
                      hessian,
                      p.driftSpeed(),
                      p.magSpeed(),
                      p.lifetime(),
                      p.scale(),
                      p.nearestNeighborDistance(),
                      jet.f_membershipFactor(),
                      jet.f_recoScale(),
                      jet.f_recoScaleRatio(),
                      p.clusterRadius(),
                      p.clusterSeparation(),
                      jet.f_code(),
                      jet.f_status());
    peak.setSplitTime(p.splitTime());
    peak.setMergeTime(p.mergeTime());

    return RecoFFTJet(peak,
                      jet.f_vec(),
                      jet.f_ncells(),
                      jet.f_etSum(),
                      jet.f_centroidEta(),
                      jet.f_centroidPhi(),
                      jet.f_etaWidth(),
                      jet.f_phiWidth(),
                      jet.f_etaPhiCorr(),
                      jet.f_fuzziness(),
                      pileupPt,
                      0.0,
                      jet.f_convergenceDistance());
  }
}  // namespace fftjetcms

#endif  // RecoJets_FFTJetAlgorithms_jetConverters_h