GSFAndBREMLinker.cc

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#include "RecoParticleFlow/PFProducer/interface/BlockElementLinkerBase.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrack.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementGsfTrack.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementBrem.h"
#include "RecoParticleFlow/PFClusterTools/interface/LinkByRecHit.h"

class GSFAndBREMLinker : public BlockElementLinkerBase {
public:
  GSFAndBREMLinker(const edm::ParameterSet& conf) :
    BlockElementLinkerBase(conf),
    _useKDTree(conf.getParameter<bool>("useKDTree")),
    _debug(conf.getUntrackedParameter<bool>("debug",false)) {}
  
  double testLink 
  ( const reco::PFBlockElement*,
    const reco::PFBlockElement* ) const override;

private:
  bool _useKDTree,_debug;
};

DEFINE_EDM_PLUGIN(BlockElementLinkerFactory, 
          GSFAndBREMLinker, 
          "GSFAndBREMLinker");

double GSFAndBREMLinker::testLink
  ( const reco::PFBlockElement* elem1,
    const reco::PFBlockElement* elem2) const {   
  double dist = -1.0;
  const reco::PFBlockElementGsfTrack * gsfelem(NULL);
  const reco::PFBlockElementBrem * bremelem(NULL);
  if( elem1->type() < elem2->type() ) {
    gsfelem = static_cast<const reco::PFBlockElementGsfTrack *>(elem1);
    bremelem = static_cast<const reco::PFBlockElementBrem *>(elem2);
  } else {
    gsfelem = static_cast<const reco::PFBlockElementGsfTrack *>(elem2);
    bremelem = static_cast<const reco::PFBlockElementBrem *>(elem1);
  }  
  const reco::GsfPFRecTrackRef& gsfref = gsfelem->GsftrackRefPF();
  const reco::GsfPFRecTrackRef& bremref = bremelem->GsftrackRefPF();
  if( gsfref.isNonnull() && bremref.isNonnull() && gsfref == bremref ) {
    dist = 0.001;
  }
  return dist;
}