Basic2DGenericTopoClusterizer.cc

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#include "Basic2DGenericTopoClusterizer.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#ifdef PFLOW_DEBUG
#define LOGVERB(x) edm::LogVerbatim(x)
#define LOGWARN(x) edm::LogWarning(x)
#define LOGERR(x) edm::LogError(x)
#define LOGDRESSED(x) edm::LogInfo(x)
#else
#define LOGVERB(x) LogTrace(x)
#define LOGWARN(x) edm::LogWarning(x)
#define LOGERR(x) edm::LogError(x)
#define LOGDRESSED(x) LogDebug(x)
#endif

void Basic2DGenericTopoClusterizer::
buildClusters(const edm::Handle<reco::PFRecHitCollection>& input,
          const std::vector<bool>& rechitMask,
          const std::vector<bool>& seedable,
          reco::PFClusterCollection& output) {
  auto const & hits = *input;  
  std::vector<bool> used(hits.size(),false);
  std::vector<unsigned int> seeds;
  
  // get the seeds and sort them descending in energy
  seeds.reserve(hits.size());  
  for( unsigned int i = 0; i < hits.size(); ++i ) {
    if( !rechitMask[i] || !seedable[i] || used[i] ) continue;
    seeds.emplace_back(i);
  }
  // maxHeap would be better
  std::sort(seeds.begin(),seeds.end(),
            [&](unsigned int i, unsigned int j) { return hits[i].energy()>hits[j].energy();});  
  
  reco::PFCluster temp;
  for( auto seed : seeds ) {    
    if( !rechitMask[seed] || !seedable[seed] || used[seed] ) continue;    
    temp.reset();
    buildTopoCluster(input,rechitMask,seed,used,temp);
    if( !temp.recHitFractions().empty() ) output.push_back(temp);
  }
}

void Basic2DGenericTopoClusterizer::
buildTopoCluster(const edm::Handle<reco::PFRecHitCollection>& input,
         const std::vector<bool>& rechitMask,
         unsigned int kcell,
         std::vector<bool>& used,        
         reco::PFCluster& topocluster) {
  auto const & cell = (*input)[kcell];
  int cell_layer = (int)cell.layer();
  if( cell_layer == PFLayer::HCAL_BARREL2 && 
      std::abs(cell.positionREP().eta()) > 0.34 ) {
      cell_layer *= 100;
    }    
  const std::pair<double,double>& thresholds =
      _thresholds.find(cell_layer)->second;
  if( cell.energy() < thresholds.first || 
      cell.pt2() < thresholds.second ) {
    LOGDRESSED("GenericTopoCluster::buildTopoCluster()")
      << "RecHit " << cell.detId() << " with enegy " 
      << cell.energy() << " GeV was rejected!." << std::endl;
    return;
  }
  auto k = kcell;
  used[k] = true;
  auto ref = makeRefhit(input,k);
  topocluster.addRecHitFraction(reco::PFRecHitFraction(ref, 1.0));
  
  auto const & neighbours = 
    ( _useCornerCells ? cell.neighbours8() : cell.neighbours4() );
  
  for( auto nb : neighbours ) {
    if( used[nb] || !rechitMask[nb] ) {
      LOGDRESSED("GenericTopoCluster::buildTopoCluster()")
        << "  RecHit " << cell.detId() << "\'s" 
    << " neighbor RecHit " << input->at(nb).detId() 
    << " with enegy " 
    << input->at(nb).energy() << " GeV was rejected!" 
    << " Reasons : " << used[nb] << " (used) " 
    << !rechitMask[nb] << " (masked)." << std::endl;
      continue;
    }
    buildTopoCluster(input,rechitMask,nb,used,topocluster);
  }
}