/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/RecoParticleFlow/PFClusterTools/src/ClusterClusterMapping.cc

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#include "RecoParticleFlow/PFClusterTools/interface/ClusterClusterMapping.h"

// returns true as soon as the two clusters have one hit in common
bool ClusterClusterMapping::overlap(const reco::CaloCluster & sc1, const reco::CaloCluster & sc2, float minfrac,bool debug)  {
  const std::vector< std::pair<DetId, float> > & hits1 = sc1.hitsAndFractions();
  const std::vector< std::pair<DetId, float> > & hits2 = sc2.hitsAndFractions();
  unsigned nhits1=hits1.size();
  unsigned nhits2=hits2.size();
  
  for(unsigned i1=0;i1<nhits1;++i1)
    { 
      // consider only with a minimum fraction of minfrac (default 1%) of the RecHit
      if(hits1[i1].second<minfrac) {
          if(debug) std::cout << " Discarding " << hits1[i1].first << " with " << hits1[i1].second << std::endl;
          continue;
        }
      for(unsigned i2=0;i2<nhits2;++i2)
        {
          // consider only with a minimum fraction of minfract (default 1%) of the RecHit
          if(hits2[i2].second<minfrac ) {
            if(debug) std::cout << " Discarding " << hits2[i2].first << " with " << hits2[i2].second << std::endl;
            continue;
          }
          if(hits1[i1].first==hits2[i2].first)
            {
              if(debug)
                {
                  std::cout << " Matching hits " << hits1[i1].first << " with " <<  hits1[i1].second << " and " <<  hits2[i2].first;
                  std::cout << " with " << hits2[i2].second << std::endl;                 
                }
              return true;
            }
        }
    }
  return false;
}

int ClusterClusterMapping::checkOverlap(const reco::PFCluster & pfc, std::vector<const reco::SuperCluster *> sc,float minfrac,bool debug) {
  int result=-1;
  unsigned nsc=sc.size();
  
  for(unsigned isc=0;isc<nsc;++isc) {
    if(overlap(pfc,*(sc[isc]),minfrac,debug))
      return isc;
  }
  return result;
}