/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/Calibration/IsolatedParticles/src/FindCaloHitCone.cc

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#include "Calibration/IsolatedParticles/interface/FindCaloHitCone.h"
#include "DataFormats/EcalDetId/interface/EcalSubdetector.h"
#include <iostream>

namespace spr {


  //Ecal Endcap OR Barrel RecHits
  std::vector<EcalRecHitCollection::const_iterator> findCone(const CaloGeometry* geo, edm::Handle<EcalRecHitCollection>& hits, const GlobalPoint& hpoint1, const GlobalPoint& point1, double dR, const GlobalVector& trackMom) {
  
    std::vector<EcalRecHitCollection::const_iterator> hit;
  
    for (EcalRecHitCollection::const_iterator j=hits->begin(); 
         j!=hits->end(); j++) {

      bool keepHit = false;
    
      if (j->id().subdetId() == EcalEndcap) {
        EEDetId EEid = EEDetId(j->id());
        const GlobalPoint rechitPoint = geo->getPosition(EEid);
        if (spr::getDistInPlaneTrackDir(point1, trackMom, rechitPoint)<dR) keepHit = true;
      } else if (j->id().subdetId() == EcalBarrel) {
        EBDetId EBid = EBDetId(j->id());
        const GlobalPoint rechitPoint = geo->getPosition(EBid);
        if (spr::getDistInPlaneTrackDir(point1, trackMom, rechitPoint)<dR) keepHit = true;
      }

      if (keepHit) hit.push_back(j);
    }
    return hit;
  }

  // Ecal Endcap AND Barrel RecHits
  std::vector<EcalRecHitCollection::const_iterator> findCone(const CaloGeometry* geo, edm::Handle<EcalRecHitCollection>& barrelhits, edm::Handle<EcalRecHitCollection>& endcaphits, const GlobalPoint& hpoint1, const GlobalPoint& point1, double dR, const GlobalVector& trackMom) {
  
    std::vector<EcalRecHitCollection::const_iterator> hit;
  
    // Only check both barrel and endcap when track is near transition
    // region: 1.479-2*0.087 < trkEta < 1.479+2*0.087
  
    bool doBarrel=false, doEndcap=false;
    if ( std::abs(point1.eta()) < 1.653) doBarrel=true; // 1.479+2*0.087
    if ( std::abs(point1.eta()) > 1.305) doEndcap=true; // 1.479-2*0.087    
  
    if (doBarrel) {  
      for (EcalRecHitCollection::const_iterator j=barrelhits->begin(); 
           j!=barrelhits->end(); j++) {

        bool keepHit = false;
        if (j->id().subdetId() == EcalBarrel) {
          EBDetId EBid = EBDetId(j->id());
          const GlobalPoint rechitPoint = geo->getPosition(EBid);
          if (spr::getDistInPlaneTrackDir(point1, trackMom, rechitPoint)<dR) keepHit = true;
        } else {
          std::cout << "PROBLEM : Endcap RecHits in Barrel Collection!?" 
                    << std::endl;
        }
        if (keepHit) hit.push_back(j);
      }
    } // doBarrel
  
    if (doEndcap) {  
    
      for (EcalRecHitCollection::const_iterator j=endcaphits->begin(); 
           j!=endcaphits->end(); j++) {
      
        bool keepHit = false;
      
        if (j->id().subdetId() == EcalEndcap) {
          EEDetId EEid = EEDetId(j->id());
          const GlobalPoint rechitPoint = geo->getPosition(EEid);
          if (spr::getDistInPlaneTrackDir(point1, trackMom, rechitPoint)<dR) keepHit = true;
        } else {
          std::cout << "PROBLEM : Barrel RecHits in Endcap Collection!?" 
                    << std::endl;
        }
        if (keepHit) hit.push_back(j);
      }
    } // doEndcap
  
    return hit;
  }


  //HBHE RecHits
  std::vector<HBHERecHitCollection::const_iterator> findCone(const CaloGeometry* geo, edm::Handle<HBHERecHitCollection>& hits, const GlobalPoint& hpoint1, const GlobalPoint& point1, double dR, const GlobalVector& trackMom) {

    std::vector<HBHERecHitCollection::const_iterator> hit;
    // Loop over Hcal RecHits
    for (HBHERecHitCollection::const_iterator j=hits->begin(); 
         j!=hits->end(); j++) {   
      DetId detId(j->id());
      const GlobalPoint rechitPoint = geo->getPosition(detId);
      if (spr::getDistInPlaneTrackDir(hpoint1, trackMom, rechitPoint)<dR) hit.push_back(j);
    }  
    return hit;
  }

  // PCalo SimHits
  std::vector<edm::PCaloHitContainer::const_iterator> findCone(const CaloGeometry* geo, edm::Handle<edm::PCaloHitContainer>& hits, const GlobalPoint& hpoint1, const GlobalPoint& point1, double dR, const GlobalVector& trackMom) {

    std::vector<edm::PCaloHitContainer::const_iterator> hit;  
    edm::PCaloHitContainer::const_iterator ihit;
    for (ihit=hits->begin(); ihit!=hits->end(); ihit++) {
      DetId detId(ihit->id());
      const GlobalPoint rechitPoint = geo->getPosition(detId);
      if (spr::getDistInPlaneTrackDir(hpoint1, trackMom, rechitPoint)<dR) {
        hit.push_back(ihit);
      }
    }
    return hit;
  }

}