CMSSW_4_4_3_patch1/src/RecoParticleFlow/PFClusterProducer/plugins/PFRecHitProducerHCAL.cc

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#include "RecoParticleFlow/PFClusterProducer/plugins/PFRecHitProducerHCAL.h"

#include <memory>

#include "DataFormats/ParticleFlowReco/interface/PFRecHit.h"

#include "DataFormats/HcalRecHit/interface/HFRecHit.h"
#include "DataFormats/HcalRecHit/interface/HBHERecHit.h"
#include "DataFormats/HcalRecHit/interface/HcalRecHitCollections.h"
#include "DataFormats/HcalDetId/interface/HcalSubdetector.h"

#include "DataFormats/DetId/interface/DetId.h"
#include "DataFormats/EcalDetId/interface/EEDetId.h"
#include "DataFormats/EcalDetId/interface/EBDetId.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"


#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "Geometry/CaloGeometry/interface/TruncatedPyramid.h"
#include "Geometry/Records/interface/CaloGeometryRecord.h"

#include "Geometry/CaloTopology/interface/HcalTopology.h"
#include "RecoCaloTools/Navigation/interface/CaloNavigator.h"

#include "DataFormats/CaloTowers/interface/CaloTowerCollection.h"

#include "Geometry/CaloTopology/interface/CaloTowerTopology.h"
#include "RecoCaloTools/Navigation/interface/CaloTowerNavigator.h"

#include "RecoLocalCalo/HcalRecAlgos/interface/HcalCaloFlagLabels.h"


using namespace std;
using namespace edm;

PFRecHitProducerHCAL::PFRecHitProducerHCAL(const edm::ParameterSet& iConfig)
  : PFRecHitProducer( iConfig ) 
{

 

  // access to the collections of rechits 

  
  inputTagHcalRecHitsHBHE_ =
    iConfig.getParameter<InputTag>("hcalRecHitsHBHE");
    
  inputTagHcalRecHitsHF_ =
    iConfig.getParameter<InputTag>("hcalRecHitsHF");
    
 
  inputTagCaloTowers_ = 
    iConfig.getParameter<InputTag>("caloTowers");
   
  thresh_HF_ = 
    iConfig.getParameter<double>("thresh_HF");
  navigation_HF_ = 
    iConfig.getParameter<bool>("navigation_HF");
  weight_HFem_ =
    iConfig.getParameter<double>("weight_HFem");
  weight_HFhad_ =
    iConfig.getParameter<double>("weight_HFhad");

  HCAL_Calib_ =
    iConfig.getParameter<bool>("HCAL_Calib");
  HF_Calib_ =
    iConfig.getParameter<bool>("HF_Calib");
  HCAL_Calib_29 = 
    iConfig.getParameter<double>("HCAL_Calib_29");
  HF_Calib_29 = 
    iConfig.getParameter<double>("HF_Calib_29");

  shortFibre_Cut = iConfig.getParameter<double>("ShortFibre_Cut");
  longFibre_Fraction = iConfig.getParameter<double>("LongFibre_Fraction");

  longFibre_Cut = iConfig.getParameter<double>("LongFibre_Cut");
  shortFibre_Fraction = iConfig.getParameter<double>("ShortFibre_Fraction");

  applyLongShortDPG_ = iConfig.getParameter<bool>("ApplyLongShortDPG");

  longShortFibre_Cut = iConfig.getParameter<double>("LongShortFibre_Cut");
  minShortTiming_Cut = iConfig.getParameter<double>("MinShortTiming_Cut");
  maxShortTiming_Cut = iConfig.getParameter<double>("MaxShortTiming_Cut");
  minLongTiming_Cut = iConfig.getParameter<double>("MinLongTiming_Cut");
  maxLongTiming_Cut = iConfig.getParameter<double>("MaxLongTiming_Cut");

  applyTimeDPG_ = iConfig.getParameter<bool>("ApplyTimeDPG");
  applyPulseDPG_ = iConfig.getParameter<bool>("ApplyPulseDPG");

  ECAL_Compensate_ = iConfig.getParameter<bool>("ECAL_Compensate");
  ECAL_Threshold_ = iConfig.getParameter<double>("ECAL_Threshold");
  ECAL_Compensation_ = iConfig.getParameter<double>("ECAL_Compensation");
  ECAL_Dead_Code_ = iConfig.getParameter<unsigned int>("ECAL_Dead_Code");

  EM_Depth_ = iConfig.getParameter<double>("EM_Depth");
  HAD_Depth_ = iConfig.getParameter<double>("HAD_Depth");

  //--ab
  produces<reco::PFRecHitCollection>("HFHAD").setBranchAlias("HFHADRecHits");
  produces<reco::PFRecHitCollection>("HFEM").setBranchAlias("HFEMRecHits");
  //--ab
}



PFRecHitProducerHCAL::~PFRecHitProducerHCAL() {}



void PFRecHitProducerHCAL::createRecHits(vector<reco::PFRecHit>& rechits,
                                         vector<reco::PFRecHit>& rechitsCleaned,
                                         edm::Event& iEvent, 
                                         const edm::EventSetup& iSetup ) {

  
  // this map is necessary to find the rechit neighbours efficiently
  //C but I should think about using Florian's hashed index to do this.
  //C in which case the map might not be necessary anymore
  //C however the hashed index does not seem to be implemented for HCAL
  // 
  // the key of this map is detId. 
  // the value is the index in the rechits vector
  map<unsigned,  unsigned > idSortedRecHits;
  map<unsigned,  unsigned > idSortedRecHitsHFEM;
  map<unsigned,  unsigned > idSortedRecHitsHFHAD;
  typedef map<unsigned, unsigned >::iterator IDH;  


  edm::ESHandle<CaloGeometry> geoHandle;
  iSetup.get<CaloGeometryRecord>().get(geoHandle);
  
  // get the hcalBarrel geometry
  const CaloSubdetectorGeometry *hcalBarrelGeometry = 
    geoHandle->getSubdetectorGeometry(DetId::Hcal, HcalBarrel);

  // get the endcap geometry
  const CaloSubdetectorGeometry *hcalEndcapGeometry = 
    geoHandle->getSubdetectorGeometry(DetId::Hcal, HcalEndcap);

  //--ab
  auto_ptr< vector<reco::PFRecHit> > HFHADRecHits( new vector<reco::PFRecHit> ); 
  auto_ptr< vector<reco::PFRecHit> > HFEMRecHits( new vector<reco::PFRecHit> ); 
  //--ab

  // 2 possibilities to make HCAL clustering :
  // - from the HCAL rechits
  // - from the CaloTowers. 
  // ultimately, clustering will be done taking CaloTowers as an 
  // input. This possibility is currently under investigation, and 
  // was thus made optional.

  // in the first step, we will fill the map of PFRecHits hcalrechits
  // either from CaloTowers or from HCAL rechits. 

  // in the second step, we will perform clustering on this map.

  if( !(inputTagCaloTowers_ == InputTag()) ) {
      
    edm::Handle<CaloTowerCollection> caloTowers; 
    CaloTowerTopology caloTowerTopology; 
    const CaloSubdetectorGeometry *caloTowerGeometry = 0; 
    // = geometry_->getSubdetectorGeometry(id)

    // get calotowers
    bool found = iEvent.getByLabel(inputTagCaloTowers_,
                                   caloTowers);

    if(!found) {
      ostringstream err;
      err<<"could not find rechits "<<inputTagCaloTowers_;
      LogError("PFRecHitProducerHCAL")<<err.str()<<endl;
    
      throw cms::Exception( "MissingProduct", err.str());
    }
    else {
      assert( caloTowers.isValid() );

      // get HF rechits
      edm::Handle<HFRecHitCollection>  hfHandle;  
      found = iEvent.getByLabel(inputTagHcalRecHitsHF_,
                                hfHandle);
      
      if(!found) {
        ostringstream err;
        err<<"could not find HF rechits "<<inputTagHcalRecHitsHF_;
        LogError("PFRecHitProducerHCAL")<<err.str()<<endl;
        
        throw cms::Exception( "MissingProduct", err.str());
      }
      else {
        assert( hfHandle.isValid() );
      }
      
      // get HBHE rechits
      edm::Handle<HBHERecHitCollection>  hbheHandle;  
      found = iEvent.getByLabel(inputTagHcalRecHitsHBHE_,
                                hbheHandle);
      
      if(!found) {
        ostringstream err;
        err<<"could not find HBHE rechits "<<inputTagHcalRecHitsHBHE_;
        LogError("PFRecHitProducerHCAL")<<err.str()<<endl;
        
        throw cms::Exception( "MissingProduct", err.str());
      }
      else {
        assert( hbheHandle.isValid() );
      }
      
      // create rechits
      typedef CaloTowerCollection::const_iterator ICT;
    
      for(ICT ict=caloTowers->begin(); ict!=caloTowers->end();ict++) {
          
        const CaloTower& ct = (*ict);
          
        //C     
        if(!caloTowerGeometry) 
          caloTowerGeometry = geoHandle->getSubdetectorGeometry(ct.id());

          
        // get the hadronic energy.
        
        // Mike: Just ask for the Hadronic part only now!
        // Patrick : ARGH ! While this is ok for the HCAL, this is 
        // just wrong for the HF (in which em/had are artificially 
        // separated. 
        double energy = ct.hadEnergy();
        //Auguste: Photons in HF have no hadEnergy in fastsim: -> all RecHit collections are empty with photons.
        double energyEM = ct.emEnergy(); // For HF !
        //so test the total energy to deal with the photons in  HF:
        if( (energy+energyEM) < 1e-9 ) continue;
          
        assert( ct.constituentsSize() );          
        //Mike: The DetId will be taken by the first Hadronic constituent
        //         of the tower. That is only what we need

        
        //get the constituents of the tower
        const std::vector<DetId>& hits = ct.constituents();
        const std::vector<DetId>& allConstituents = theTowerConstituentsMap->constituentsOf(ct.id());

        /*
        for(unsigned int i=0;i< hits.size();++i) {
          if(hits[i].det()==DetId::Hcal) {
            HcalDetId did = hits[i];
            if ( did.subdet()==HcalEndcap || did.subdet()==HcalForward ) { 
              //double en = hits[i].energy();
              int ieta = did.ieta();
              const CaloCellGeometry *thisCell = hcalEndcapGeometry->getGeometry(did);
              const GlobalPoint& position = thisCell->getPosition();
              if ( abs(ieta) > 27 && abs(ieta) < 33 && energy > 10. ) { 
                std::cout << "HE/HF hit " << i << " at eta = " << ieta 
                          << " with CT energy = " << energy 
                          << " at eta, z (hit) = " << position.eta() << " " << position.z()
                          << " at eta, z (cte) = " << ct.emPosition().eta() << " " << ct.emPosition().z()
                          << " at eta, z (cth) = " << ct.hadPosition().eta() << " " << ct.hadPosition().z()
                          << " at eta, z (cto) = " << ct.eta() << " " << ct.vz() 
                          << std::endl;
              }
            }
          }
        }
        */
        
        //Reserve the DetId we are looking for:

        HcalDetId detid;
        // EcalDetId edetid;
        bool foundHCALConstituent = false;

 
        //Loop on the calotower constituents and search for HCAL
        double dead = 0.;
        double alive = 0.;
        for(unsigned int i=0;i< hits.size();++i) {
          if(hits[i].det()==DetId::Hcal) { 
            foundHCALConstituent = true;
            detid = hits[i];
            // An HCAL tower was found: Look for dead ECAL channels in the same CaloTower.
            if ( ECAL_Compensate_ && energy > ECAL_Threshold_ ) {
              for(unsigned int j=0;j<allConstituents.size();++j) { 
                if ( allConstituents[j].det()==DetId::Ecal ) { 
                  alive += 1.;
                  EcalChannelStatus::const_iterator chIt = theEcalChStatus->find(allConstituents[j]);
                  unsigned int dbStatus = chIt != theEcalChStatus->end() ? chIt->getStatusCode() : 0;
                  if ( dbStatus > ECAL_Dead_Code_ ) dead += 1.;
                }
              }
            } 
            // Protection: tower 29 in HF is merged with tower 30. 
            // Just take the position of tower 30 in that case. 
            if ( detid.subdet() == HcalForward && abs(detid.ieta()) == 29 ) continue; 
            break;
          }
        }

        // In case of dead ECAL channel, rescale the HCAL energy...
        double rescaleFactor = alive > 0. ? 1. + ECAL_Compensation_*dead/alive : 1.;
          
        reco::PFRecHit* pfrh = 0;
        reco::PFRecHit* pfrhCleaned = 0;
        //---ab: need 2 rechits for the HF:
        reco::PFRecHit* pfrhHFEM = 0;
        reco::PFRecHit* pfrhHFHAD = 0;
        reco::PFRecHit* pfrhHFEMCleaned = 0;
        reco::PFRecHit* pfrhHFHADCleaned = 0;
        reco::PFRecHit* pfrhHFEMCleaned29 = 0;
        reco::PFRecHit* pfrhHFHADCleaned29 = 0;

        if(foundHCALConstituent)
          {
            // std::cout << ", new Energy = " << energy << std::endl;
            switch( detid.subdet() ) {
            case HcalBarrel: 
              {
                if(energy < thresh_Barrel_ ) continue;

                /*
                // Check the timing
                if ( energy > 5. ) { 
                  for(unsigned int i=0;i< hits.size();++i) {
                    if( hits[i].det() != DetId::Hcal ) continue; 
                    HcalDetId theDetId = hits[i]; 
                    typedef HBHERecHitCollection::const_iterator iHBHE;
                    iHBHE theHit = hbheHandle->find(theDetId); 
                    if ( theHit != hbheHandle->end() ) 
                      std::cout << "HCAL hit : " 
                                << theDetId.ieta() << " " << theDetId.iphi() << " " 
                                << theHit->energy() << " " << theHit->time() << std::endl;
                  }
                }
                */


                // if ( HCAL_Calib_ ) energy   *= std::min(max_Calib_,myPFCorr->getValues(detid)->getValue());
                //if ( rescaleFactor > 1. ) 
                // std::cout << "Barrel HCAL energy rescaled from = " << energy << " to " << energy*rescaleFactor << std::endl;
                if ( rescaleFactor > 1. ) { 
                  pfrhCleaned = createHcalRecHit( detid, 
                                                  energy, 
                                                  PFLayer::HCAL_BARREL1, 
                                                  hcalBarrelGeometry,
                                                  ct.id().rawId() );
                  pfrhCleaned->setRescale(rescaleFactor);
                  energy *= rescaleFactor;
                }
                pfrh = createHcalRecHit( detid, 
                                         energy, 
                                 PFLayer::HCAL_BARREL1, 
                                         hcalBarrelGeometry,
                                         ct.id().rawId() );
                pfrh->setRescale(rescaleFactor);
              }
              break;
            case HcalEndcap:
              {
                if(energy < thresh_Endcap_ ) continue;

                /*
                // Check the timing
                if ( energy > 5. ) { 
                  for(unsigned int i=0;i< hits.size();++i) {
                    if( hits[i].det() != DetId::Hcal ) continue; 
                    HcalDetId theDetId = hits[i]; 
                    typedef HBHERecHitCollection::const_iterator iHBHE;
                    iHBHE theHit = hbheHandle->find(theDetId); 
                    if ( theHit != hbheHandle->end() ) 
                      std::cout << "HCAL hit : " 
                                << theDetId.ieta() << " " << theDetId.iphi() << " " 
                                << theHit->energy() << " " << theHit->time() << std::endl;
                  }
                }
                */

                // Apply tower 29 calibration
                if ( HCAL_Calib_ && abs(detid.ieta()) == 29 ) energy *= HCAL_Calib_29;
                //if ( rescaleFactor > 1. ) 
                // std::cout << "End-cap HCAL energy rescaled from = " << energy << " to " << energy*rescaleFactor << std::endl;
                if ( rescaleFactor > 1. ) { 
                  pfrhCleaned = createHcalRecHit( detid, 
                                                  energy, 
                                                  PFLayer::HCAL_ENDCAP, 
                                                  hcalEndcapGeometry,
                                                  ct.id().rawId() );
                  pfrhCleaned->setRescale(rescaleFactor);
                  energy *= rescaleFactor;
                }
                pfrh = createHcalRecHit( detid, 
                                         energy, 
                                         PFLayer::HCAL_ENDCAP, 
                                         hcalEndcapGeometry,
                                         ct.id().rawId() );
                pfrh->setRescale(rescaleFactor);
              }
              break;
            case HcalOuter:
              {
              }
              break;
            case HcalForward:
              {
                //---ab: 2 rechits for HF:
                //double energyemHF = weight_HFem_*ct.emEnergy();
                //double energyhadHF = weight_HFhad_*ct.hadEnergy();
                double energyemHF = weight_HFem_ * energyEM;
                double energyhadHF = weight_HFhad_ * energy;
                // Some energy in the tower !
                if((energyemHF+energyhadHF) < thresh_HF_ ) continue;

                // Some cleaning in the HF 
                double longFibre = energyemHF + energyhadHF/2.;
                double shortFibre = energyhadHF/2.;
                int ieta = detid.ieta();
                int iphi = detid.iphi();
                HcalDetId theLongDetId (HcalForward, ieta, iphi, 1);
                HcalDetId theShortDetId (HcalForward, ieta, iphi, 2);
                typedef HFRecHitCollection::const_iterator iHF;
                iHF theLongHit = hfHandle->find(theLongDetId); 
                iHF theShortHit = hfHandle->find(theShortDetId); 
                // 
                double theLongHitEnergy = 0.;
                double theShortHitEnergy = 0.;
                bool flagShortDPG =  false; 
                bool flagLongDPG = false; 
                bool flagShortTimeDPG = false; 
                bool flagLongTimeDPG = false;
                bool flagShortPulseDPG = false;
                bool flagLongPulseDPG = false;
                //
                if ( theLongHit != hfHandle->end() ) { 
                  theLongHitEnergy = theLongHit->energy();
                  flagLongDPG = applyLongShortDPG_ && theLongHit->flagField(HcalCaloFlagLabels::HFLongShort)==1;
                  flagLongTimeDPG = applyTimeDPG_ && theLongHit->flagField(HcalCaloFlagLabels::HFInTimeWindow)==1;
                  flagLongPulseDPG = applyPulseDPG_ && theLongHit->flagField(HcalCaloFlagLabels::HFDigiTime)==1;
                }
                //
                if ( theShortHit != hfHandle->end() ) { 
                  theShortHitEnergy = theShortHit->energy();
                  flagShortDPG =  applyLongShortDPG_ && theShortHit->flagField(HcalCaloFlagLabels::HFLongShort)==1;
                  flagShortTimeDPG = applyTimeDPG_ && theShortHit->flagField(HcalCaloFlagLabels::HFInTimeWindow)==1;
                  flagShortPulseDPG = applyPulseDPG_ && theShortHit->flagField(HcalCaloFlagLabels::HFDigiTime)==1;
                }

                // Then check the timing in short and long fibres in all other towers.
                if ( theShortHitEnergy > longShortFibre_Cut && 
                     ( theShortHit->time() < minShortTiming_Cut ||
                       theShortHit->time() > maxShortTiming_Cut || 
                       flagShortTimeDPG || flagShortPulseDPG ) ) { 
                  // rescaleFactor = 0. ;
                  pfrhHFHADCleaned = createHcalRecHit( detid, 
                                                       theShortHitEnergy, 
                                                       PFLayer::HF_HAD, 
                                                       hcalEndcapGeometry,
                                                       ct.id().rawId() );
                  pfrhHFHADCleaned->setRescale(theShortHit->time());
                  /*
                  std::cout << "ieta/iphi = " << ieta << " " << iphi 
                            << ", Energy em/had/long/short = " 
                            << energyemHF << " " << energyhadHF << " "
                            << theLongHitEnergy << " " << theShortHitEnergy << " " 
                            << ". Time = " << theShortHit->time() << " " 
                            << ". The short and long flags : " 
                            << flagShortDPG << " " << flagLongDPG << " "  
                            << flagShortTimeDPG << " " << flagLongTimeDPG << " "  
                            << flagShortPulseDPG << " " << flagLongPulseDPG << " "  
                            << ". Short fibres were cleaned." << std::endl;
                  */
                  shortFibre -= theShortHitEnergy;
                  theShortHitEnergy = 0.;
                }
                
                
                if ( theLongHitEnergy > longShortFibre_Cut && 
                     ( theLongHit->time() < minLongTiming_Cut ||
                       theLongHit->time() > maxLongTiming_Cut  || 
                       flagLongTimeDPG || flagLongPulseDPG ) ) { 
                  //rescaleFactor = 0. ;
                  pfrhHFEMCleaned = createHcalRecHit( detid, 
                                                      theLongHitEnergy, 
                                                      PFLayer::HF_EM, 
                                                      hcalEndcapGeometry,
                                                      ct.id().rawId() );
                  pfrhHFEMCleaned->setRescale(theLongHit->time());
                  /*
                  std::cout << "ieta/iphi = " << ieta << " " << iphi 
                            << ", Energy em/had/long/short = " 
                            << energyemHF << " " << energyhadHF << " "
                            << theLongHitEnergy << " " << theShortHitEnergy << " " 
                            << ". Time = " << theLongHit->time() << " " 
                            << ". The short and long flags : " 
                            << flagShortDPG << " " << flagLongDPG << " "  
                            << flagShortTimeDPG << " " << flagLongTimeDPG << " "  
                            << flagShortPulseDPG << " " << flagLongPulseDPG << " "  
                            << ". Long fibres were cleaned." << std::endl;
                  */
                  longFibre -= theLongHitEnergy;
                  theLongHitEnergy = 0.;
                }

                // Some energy must be in the long fibres is there is some energy in the short fibres ! 
                if ( theShortHitEnergy > shortFibre_Cut && 
                     ( theLongHitEnergy/theShortHitEnergy < longFibre_Fraction || 
                       flagShortDPG ) ) {
                  // Check if the long-fibre hit was not cleaned already (because hot)
                  // In this case don't apply the cleaning
                  const HcalChannelStatus* theStatus = theHcalChStatus->getValues(theLongDetId);
                  unsigned theStatusValue = theStatus->getValue();
                  // The channel is killed
                  if ( !theStatusValue ) { 
                    // rescaleFactor = 0. ;
                    pfrhHFHADCleaned = createHcalRecHit( detid, 
                                                         theShortHitEnergy, 
                                                         PFLayer::HF_HAD, 
                                                         hcalEndcapGeometry,
                                                         ct.id().rawId() );
                    pfrhHFHADCleaned->setRescale(theShortHit->time());
                    /*
                    std::cout << "ieta/iphi = " << ieta << " " << iphi 
                              << ", Energy em/had/long/short = " 
                              << energyemHF << " " << energyhadHF << " "
                              << theLongHitEnergy << " " << theShortHitEnergy << " " 
                              << ". Time = " << theShortHit->time() << " " 
                              << ". The status value is " << theStatusValue
                              << ". The short and long flags : " 
                              << flagShortDPG << " " << flagLongDPG << " "  
                              << flagShortTimeDPG << " " << flagLongTimeDPG << " "  
                              << flagShortPulseDPG << " " << flagLongPulseDPG << " "  
                              << ". Short fibres were cleaned." << std::endl;
                    */
                    shortFibre -= theShortHitEnergy;
                    theShortHitEnergy = 0.;
                  }
                }

                if ( theLongHitEnergy > longFibre_Cut && 
                     ( theShortHitEnergy/theLongHitEnergy < shortFibre_Fraction || 
                       flagLongDPG ) ) {
                  // Check if the long-fibre hit was not cleaned already (because hot)
                  // In this case don't apply the cleaning
                  const HcalChannelStatus* theStatus = theHcalChStatus->getValues(theShortDetId);
                  unsigned theStatusValue = theStatus->getValue();
                  // The channel is killed
                  if ( !theStatusValue ) { 
                    //rescaleFactor = 0. ;
                    pfrhHFEMCleaned = createHcalRecHit( detid, 
                                                      theLongHitEnergy, 
                                                      PFLayer::HF_EM, 
                                                      hcalEndcapGeometry,
                                                      ct.id().rawId() );
                    pfrhHFEMCleaned->setRescale(theLongHit->time());
                    /*
                    std::cout << "ieta/iphi = " << ieta << " " << iphi 
                              << ", Energy em/had/long/short = " 
                              << energyemHF << " " << energyhadHF << " "
                              << theLongHitEnergy << " " << theShortHitEnergy << " " 
                              << ". The status value is " << theStatusValue
                              << ". Time = " << theLongHit->time() << " " 
                              << ". The short and long flags : " 
                              << flagShortDPG << " " << flagLongDPG << " "  
                              << flagShortTimeDPG << " " << flagLongTimeDPG << " "  
                              << flagShortPulseDPG << " " << flagLongPulseDPG << " "  
                              << ". Long fibres were cleaned." << std::endl;
                    */
                    longFibre -= theLongHitEnergy;
                    theLongHitEnergy = 0.;
                  }
                }

                // Special treatment for tower 29
                // A tower with energy only at ieta = +/- 29 is not physical -> Clean
                if ( abs(ieta) == 29 ) { 
                  // rescaleFactor = 0. ;
                  // Clean long fibres
                  if ( theLongHitEnergy > shortFibre_Cut/2. ) { 
                    pfrhHFEMCleaned29 = createHcalRecHit( detid, 
                                                          theLongHitEnergy, 
                                                          PFLayer::HF_EM, 
                                                          hcalEndcapGeometry,
                                                          ct.id().rawId() );
                    pfrhHFEMCleaned29->setRescale(theLongHit->time());
                    /*
                    std::cout << "ieta/iphi = " << ieta << " " << iphi 
                              << ", Energy em/had/long/short = " 
                              << energyemHF << " " << energyhadHF << " "
                              << theLongHitEnergy << " " << theShortHitEnergy << " " 
                              << ". Long fibres were cleaned." << std::endl;
                    */
                    longFibre -= theLongHitEnergy;
                    theLongHitEnergy = 0.;
                  }
                  // Clean short fibres
                  if ( theShortHitEnergy > shortFibre_Cut/2. ) { 
                    pfrhHFHADCleaned29 = createHcalRecHit( detid, 
                                                           theShortHitEnergy, 
                                                           PFLayer::HF_HAD, 
                                                           hcalEndcapGeometry,
                                                           ct.id().rawId() );
                    pfrhHFHADCleaned29->setRescale(theShortHit->time());
                    /*
                    std::cout << "ieta/iphi = " << ieta << " " << iphi 
                              << ", Energy em/had/long/short = " 
                              << energyemHF << " " << energyhadHF << " "
                              << theLongHitEnergy << " " << theShortHitEnergy << " " 
                              << ". Short fibres were cleaned." << std::endl;
                    */
                    shortFibre -= theShortHitEnergy;
                    theShortHitEnergy = 0.;
                  }
                }
                // Check the timing of the long and short fibre rechits
                
                // First, check the timing of long and short fibre in eta = 29 if tower 30.
                else if ( abs(ieta) == 30 ) { 
                  int ieta29 = ieta > 0 ? 29 : -29;
                  HcalDetId theLongDetId29 (HcalForward, ieta29, iphi, 1);
                  HcalDetId theShortDetId29 (HcalForward, ieta29, iphi, 2);
                  iHF theLongHit29 = hfHandle->find(theLongDetId29); 
                  iHF theShortHit29 = hfHandle->find(theShortDetId29); 
                  // 
                  double theLongHitEnergy29 = 0.;
                  double theShortHitEnergy29 = 0.;
                  bool flagShortDPG29 =  false; 
                  bool flagLongDPG29 = false; 
                  bool flagShortTimeDPG29 = false; 
                  bool flagLongTimeDPG29 = false;
                  bool flagShortPulseDPG29 = false;
                  bool flagLongPulseDPG29 = false;
                  //
                  if ( theLongHit29 != hfHandle->end() ) {                  
                    theLongHitEnergy29 = theLongHit29->energy() ;
                    flagLongDPG29 = applyLongShortDPG_ && theLongHit29->flagField(HcalCaloFlagLabels::HFLongShort)==1;
                    flagLongTimeDPG29 = applyTimeDPG_ && theLongHit29->flagField(HcalCaloFlagLabels::HFInTimeWindow)==1;
                    flagLongPulseDPG29 = applyPulseDPG_ && theLongHit29->flagField(HcalCaloFlagLabels::HFDigiTime)==1;
                  }
                  //
                  if ( theShortHit29 != hfHandle->end() ) {                 
                    theShortHitEnergy29 = theShortHit29->energy();                
                    flagShortDPG29 = applyLongShortDPG_ && theShortHit29->flagField(HcalCaloFlagLabels::HFLongShort)==1;
                    flagShortTimeDPG29 = applyTimeDPG_ && theShortHit29->flagField(HcalCaloFlagLabels::HFInTimeWindow)==1;
                    flagShortPulseDPG29 = applyPulseDPG_ && theShortHit29->flagField(HcalCaloFlagLabels::HFDigiTime)==1;
                  }

                  if ( theLongHitEnergy29 > longShortFibre_Cut && 
                       ( theLongHit29->time() < minLongTiming_Cut ||
                         theLongHit29->time() > maxLongTiming_Cut ||
                         flagLongTimeDPG29 || flagLongPulseDPG29 ) ) { 
                    //rescaleFactor = 0. ;
                    pfrhHFEMCleaned29 = createHcalRecHit( detid, 
                                                          theLongHitEnergy29, 
                                                          PFLayer::HF_EM, 
                                                          hcalEndcapGeometry,
                                                          ct.id().rawId() );
                    pfrhHFEMCleaned29->setRescale(theLongHit29->time());
                    /*
                    std::cout << "ieta/iphi = " << ieta29 << " " << iphi 
                              << ", Energy em/had/long/short = " 
                              << energyemHF << " " << energyhadHF << " "
                              << theLongHitEnergy29 << " " << theShortHitEnergy29 << " " 
                              << ". Time = " << theLongHit29->time() << " " 
                              << ". The short and long flags : " 
                              << flagShortDPG29 << " " << flagLongDPG29 << " "  
                              << flagShortTimeDPG29 << " " << flagLongTimeDPG29 << " "  
                              << flagShortPulseDPG29 << " " << flagLongPulseDPG29 << " "  
                              << ". Long fibres were cleaned." << std::endl;
                    */
                    longFibre -= theLongHitEnergy29;
                    theLongHitEnergy29 = 0;
                  }

                  if ( theShortHitEnergy29 > longShortFibre_Cut && 
                       ( theShortHit29->time() < minShortTiming_Cut ||
                         theShortHit29->time() > maxShortTiming_Cut ||
                         flagShortTimeDPG29 || flagShortPulseDPG29 ) ) { 
                    //rescaleFactor = 0. ;
                    pfrhHFHADCleaned29 = createHcalRecHit( detid, 
                                                         theShortHitEnergy29, 
                                                         PFLayer::HF_HAD, 
                                                         hcalEndcapGeometry,
                                                         ct.id().rawId() );
                    pfrhHFHADCleaned29->setRescale(theShortHit29->time());
                    /*
                    std::cout << "ieta/iphi = " << ieta29 << " " << iphi 
                              << ", Energy em/had/long/short = " 
                              << energyemHF << " " << energyhadHF << " "
                              << theLongHitEnergy29 << " " << theShortHitEnergy29 << " " 
                              << ". Time = " << theShortHit29->time() << " " 
                              << ". The short and long flags : " 
                              << flagShortDPG29 << " " << flagLongDPG29 << " "  
                              << flagShortTimeDPG29 << " " << flagLongTimeDPG29 << " "  
                              << flagShortPulseDPG29 << " " << flagLongPulseDPG29 << " "  
                              << ". Short fibres were cleaned." << std::endl;
                    */
                    shortFibre -= theShortHitEnergy29;
                    theShortHitEnergy29 = 0.;
                  }

                  // Some energy must be in the long fibres is there is some energy in the short fibres ! 
                  if ( theShortHitEnergy29 > shortFibre_Cut && 
                       ( theLongHitEnergy29/theShortHitEnergy29 < 2.*longFibre_Fraction || 
                         flagShortDPG29 ) ) {
                    // Check if the long-fibre hit was not cleaned already (because hot)
                    // In this case don't apply the cleaning
                    const HcalChannelStatus* theStatus = theHcalChStatus->getValues(theLongDetId29);
                    unsigned theStatusValue = theStatus->getValue();
                    // The channel is killed
                    if ( !theStatusValue ) { 
                      //rescaleFactor = 0. ;
                      pfrhHFHADCleaned29 = createHcalRecHit( detid, 
                                                           theShortHitEnergy29, 
                                                           PFLayer::HF_HAD, 
                                                           hcalEndcapGeometry,
                                                           ct.id().rawId() );
                      pfrhHFHADCleaned29->setRescale(theShortHit29->time());
                      /*
                      std::cout << "ieta/iphi = " << ieta29 << " " << iphi 
                                << ", Energy em/had/long/short = " 
                                << energyemHF << " " << energyhadHF << " "
                                << theLongHitEnergy29 << " " << theShortHitEnergy29 << " " 
                                << ". Time = " << theShortHit29->time() << " " 
                                << ". The status value is " << theStatusValue
                                << ". The short and long flags : " 
                                << flagShortDPG29 << " " << flagLongDPG29 << " "  
                                << flagShortTimeDPG29 << " " << flagLongTimeDPG29 << " "  
                                << flagShortPulseDPG29 << " " << flagLongPulseDPG29 << " "  
                                << ". Short fibres were cleaned." << std::endl;
                      */
                      shortFibre -= theShortHitEnergy29;
                      theShortHitEnergy29 = 0.;
                    }       
                  }
                  
                  // Some energy must be in the short fibres is there is some energy in the long fibres ! 
                  if ( theLongHitEnergy29 > longFibre_Cut && 
                       ( theShortHitEnergy29/theLongHitEnergy29 < shortFibre_Fraction || 
                         flagLongDPG29 ) ) {
                    // Check if the long-fibre hit was not cleaned already (because hot)
                    // In this case don't apply the cleaning
                    const HcalChannelStatus* theStatus = theHcalChStatus->getValues(theShortDetId29);
                    unsigned theStatusValue = theStatus->getValue();
                    // The channel is killed
                    if ( !theStatusValue ) { 
                      //rescaleFactor = 0. ;
                      pfrhHFEMCleaned29 = createHcalRecHit( detid, 
                                                            theLongHitEnergy29, 
                                                            PFLayer::HF_EM, 
                                                            hcalEndcapGeometry,
                                                            ct.id().rawId() );
                      pfrhHFEMCleaned29->setRescale(theLongHit29->time());
                      /* 
                      std::cout << "ieta/iphi = " << ieta29 << " " << iphi 
                                << ", Energy em/had/long/short = " 
                                << energyemHF << " " << energyhadHF << " "
                                << theLongHitEnergy29 << " " << theShortHitEnergy29 << " " 
                                << ". The status value is " << theStatusValue
                                << ". Time = " << theLongHit29->time() << " " 
                                << ". The short and long flags : " 
                                << flagShortDPG29 << " " << flagLongDPG29 << " "  
                                << flagShortTimeDPG29 << " " << flagLongTimeDPG29 << " "  
                                << flagShortPulseDPG29 << " " << flagLongPulseDPG29 << " "  
                                << ". Long fibres were cleaned." << std::endl;
                      */
                      longFibre -= theLongHitEnergy29;
                      theLongHitEnergy29 = 0.;
                    }
                  }

                  // Check that the energy in tower 29 is smaller than in tower 30
                  // First in long fibres
                  if ( theLongHitEnergy29 > std::max(theLongHitEnergy,shortFibre_Cut/2) ) { 
                    pfrhHFEMCleaned29 = createHcalRecHit( detid, 
                                                          theLongHitEnergy29, 
                                                          PFLayer::HF_EM, 
                                                          hcalEndcapGeometry,
                                                          ct.id().rawId() );
                    pfrhHFEMCleaned29->setRescale(theLongHit29->time());
                    /*
                    std::cout << "ieta/iphi = " << ieta29 << " " << iphi 
                              << ", Energy L29/S29/L30/S30 = " 
                              << theLongHitEnergy29 << " " << theShortHitEnergy29 << " "
                              << theLongHitEnergy << " " << theShortHitEnergy << " " 
                              << ". Long fibres were cleaned." << std::endl;
                    */
                    longFibre -= theLongHitEnergy29;
                    theLongHitEnergy29 = 0.;
                  }
                  // Second in short fibres
                  if ( theShortHitEnergy29 > std::max(theShortHitEnergy,shortFibre_Cut/2.) ) { 
                    pfrhHFHADCleaned29 = createHcalRecHit( detid, 
                                                           theShortHitEnergy29, 
                                                           PFLayer::HF_HAD, 
                                                           hcalEndcapGeometry,
                                                           ct.id().rawId() );
                    pfrhHFHADCleaned29->setRescale(theShortHit29->time());
                    /*
                    std::cout << "ieta/iphi = " << ieta << " " << iphi 
                              << ", Energy L29/S29/L30/S30 = " 
                              << theLongHitEnergy29 << " " << theShortHitEnergy29 << " "
                              << theLongHitEnergy << " " << theShortHitEnergy << " " 
                              << ". Short fibres were cleaned." << std::endl;
                    */
                    shortFibre -= theShortHitEnergy29;
                    theShortHitEnergy29 = 0.;
                  }
                }


                // Determine EM and HAD after cleaning of short and long fibres
                energyhadHF = 2.*shortFibre;
                energyemHF = longFibre - shortFibre;

                // The EM energy might be negative, as it amounts to Long - Short
                // In that case, put the EM "energy" in the HAD energy
                // Just to avoid systematic positive bias due to "Short" high fluctuations
                if ( energyemHF < thresh_HF_ ) { 
                  energyhadHF += energyemHF;
                  energyemHF = 0.;
                }

                // Apply HCAL calibration factors flor towers close to 29, if requested
                if ( HF_Calib_ && abs(detid.ieta()) <= 32 ) { 
                  energyhadHF *= HF_Calib_29;
                  energyemHF *= HF_Calib_29;
                }
                                
                // Create an EM and a HAD rechit if above threshold.
                if ( energyemHF > thresh_HF_ || energyhadHF > thresh_HF_ ) { 
                  pfrhHFEM = createHcalRecHit( detid, 
                                               energyemHF, 
                                               PFLayer::HF_EM, 
                                               hcalEndcapGeometry,
                                               ct.id().rawId() );
                  pfrhHFHAD = createHcalRecHit( detid, 
                                                energyhadHF, 
                                                PFLayer::HF_HAD, 
                                                hcalEndcapGeometry,
                                                ct.id().rawId() );
                  pfrhHFEM->setEnergyUp(energyhadHF);
                  pfrhHFHAD->setEnergyUp(energyemHF);
                }
                
              }
              break;
            default:
              LogError("PFRecHitProducerHCAL")
                <<"CaloTower constituent: unknown layer : "
                <<detid.subdet()<<endl;
            } 

            if(pfrh) { 
              rechits.push_back( *pfrh );
              delete pfrh;
              idSortedRecHits.insert( make_pair(ct.id().rawId(), 
                                                rechits.size()-1 ) ); 
            }
            if(pfrhCleaned) { 
              rechitsCleaned.push_back( *pfrhCleaned );
              delete pfrhCleaned;
            }
            //---ab: 2 rechits for HF:     
            if(pfrhHFEM) { 
              HFEMRecHits->push_back( *pfrhHFEM );
              delete pfrhHFEM;
              idSortedRecHitsHFEM.insert( make_pair(ct.id().rawId(), 
                                                HFEMRecHits->size()-1 ) ); 
            }
            if(pfrhHFHAD) { 
              HFHADRecHits->push_back( *pfrhHFHAD );
              delete pfrhHFHAD;
              idSortedRecHitsHFHAD.insert( make_pair(ct.id().rawId(), 
                                                HFHADRecHits->size()-1 ) ); 
            }
            //---ab        
            if(pfrhHFEMCleaned) { 
              rechitsCleaned.push_back( *pfrhHFEMCleaned );
              delete pfrhHFEMCleaned;
            }
            if(pfrhHFHADCleaned) { 
              rechitsCleaned.push_back( *pfrhHFHADCleaned );
              delete pfrhHFHADCleaned;
            }
            if(pfrhHFEMCleaned29) { 
              rechitsCleaned.push_back( *pfrhHFEMCleaned29 );
              delete pfrhHFEMCleaned29;
            }
            if(pfrhHFHADCleaned29) { 
              rechitsCleaned.push_back( *pfrhHFHADCleaned29 );
              delete pfrhHFHADCleaned29;
            }
          }
      }
      // do navigation 
      for(unsigned i=0; i<rechits.size(); i++ ) {
        findRecHitNeighboursCT( rechits[i], 
                                idSortedRecHits, 
                                caloTowerTopology);
      }
      for(unsigned i=0; i<HFEMRecHits->size(); i++ ) {
        findRecHitNeighboursCT( (*HFEMRecHits)[i], 
                                idSortedRecHitsHFEM, 
                                caloTowerTopology);
      }
      for(unsigned i=0; i<HFHADRecHits->size(); i++ ) {
        findRecHitNeighboursCT( (*HFHADRecHits)[i], 
                                idSortedRecHitsHFHAD, 
                                caloTowerTopology);
      }
      iEvent.put( HFHADRecHits,"HFHAD" );       
      iEvent.put( HFEMRecHits,"HFEM" ); 
    }   
  }
  else if( !(inputTagHcalRecHitsHBHE_ == InputTag()) ) { 
    // clustering is not done on CaloTowers but on HCAL rechits.
       
  
    // get the hcal topology
    HcalTopology hcalTopology;
    
    // HCAL rechits 
    //    vector<edm::Handle<HBHERecHitCollection> > hcalHandles;  
    edm::Handle<HBHERecHitCollection>  hcalHandle;  

    
    bool found = iEvent.getByLabel(inputTagHcalRecHitsHBHE_, 
                                   hcalHandle );

    if(!found) {
      ostringstream err;
      err<<"could not find rechits "<<inputTagHcalRecHitsHBHE_;
      LogError("PFRecHitProducerHCAL")<<err.str()<<endl;
    
      throw cms::Exception( "MissingProduct", err.str());
    }
    else {
      assert( hcalHandle.isValid() );
      
      const edm::Handle<HBHERecHitCollection>& handle = hcalHandle;
      for(unsigned irechit=0; irechit<handle->size(); irechit++) {
        const HBHERecHit& hit = (*handle)[irechit];
        
        double energy = hit.energy();
        
        reco::PFRecHit* pfrh = 0;
        

        const HcalDetId& detid = hit.detid();
        switch( detid.subdet() ) {
        case HcalBarrel:
          {
            if(energy < thresh_Barrel_ ) continue;
            pfrh = createHcalRecHit( detid, 
                                     energy, 
                                     PFLayer::HCAL_BARREL1, 
                                     hcalBarrelGeometry );
          }
          break;
        case HcalEndcap:
          {
            if(energy < thresh_Endcap_ ) continue;
            pfrh = createHcalRecHit( detid, 
                                     energy, 
                                     PFLayer::HCAL_ENDCAP, 
                                     hcalEndcapGeometry );        
          }
          break;
        case HcalForward:
          {
            if(energy < thresh_HF_ ) continue;
            pfrh = createHcalRecHit( detid, 
                                     energy, 
                                     PFLayer::HF_HAD, 
                                     hcalEndcapGeometry );
          }
          break;
        default:
          LogError("PFRecHitProducerHCAL")
            <<"HCAL rechit: unknown layer : "<<detid.subdet()<<endl;
          continue;
        } 

        if(pfrh) { 
          rechits.push_back( *pfrh );
          delete pfrh;
          idSortedRecHits.insert( make_pair(detid.rawId(), 
                                            rechits.size()-1 ) ); 
        }
      }
      
      
      // do navigation:
      for(unsigned i=0; i<rechits.size(); i++ ) {
        
        findRecHitNeighbours( rechits[i], idSortedRecHits, 
                              hcalTopology, 
                              *hcalBarrelGeometry, 
                              hcalTopology,
                              *hcalEndcapGeometry);
      } // loop for navigation
    }  // endif hcal rechits were found
  } // endif clustering on rechits in hcal
}






reco::PFRecHit* 
PFRecHitProducerHCAL::createHcalRecHit( const DetId& detid,
                                        double energy,
                                        PFLayer::Layer layer,
                                        const CaloSubdetectorGeometry* geom,
                                        unsigned newDetId ) {
  
  const CaloCellGeometry *thisCell = geom->getGeometry(detid);
  if(!thisCell) {
    edm::LogError("PFRecHitProducerHCAL")
      <<"warning detid "<<detid.rawId()<<" not found in layer "
      <<layer<<endl;
    return 0;
  }
  
  const GlobalPoint& position = thisCell->getPosition();
  
  double depth_correction = 0.;
  switch ( layer ) { 
  case PFLayer::HF_EM:
    depth_correction = position.z() > 0. ? EM_Depth_ : -EM_Depth_;
    break;
  case PFLayer::HF_HAD:
    depth_correction = position.z() > 0. ? HAD_Depth_ : -HAD_Depth_;
    break;
  default:
    break;
  }

  unsigned id = detid;
  if(newDetId) id = newDetId;
  reco::PFRecHit *rh = 
    new reco::PFRecHit( id,  layer, energy, 
                        position.x(), position.y(), position.z()+depth_correction, 
                        0,0,0 );
 
  
  
  
  // set the corners
  const CaloCellGeometry::CornersVec& corners = thisCell->getCorners();

  assert( corners.size() == 8 );

  rh->setNECorner( corners[0].x(), corners[0].y(),  corners[0].z()+depth_correction );
  rh->setSECorner( corners[1].x(), corners[1].y(),  corners[1].z()+depth_correction );
  rh->setSWCorner( corners[2].x(), corners[2].y(),  corners[2].z()+depth_correction );
  rh->setNWCorner( corners[3].x(), corners[3].y(),  corners[3].z()+depth_correction );
 
  return rh;
}




void 
PFRecHitProducerHCAL::findRecHitNeighbours
( reco::PFRecHit& rh, 
  const map<unsigned,unsigned >& sortedHits, 
  const CaloSubdetectorTopology& barrelTopology, 
  const CaloSubdetectorGeometry& barrelGeometry, 
  const CaloSubdetectorTopology& endcapTopology, 
  const CaloSubdetectorGeometry& endcapGeometry ) {
  
  //cout<<"------PFRecHitProducerHcaL:findRecHitNeighbours navigation value "<<navigation_HF_<<endl;
 if(navigation_HF_ == false){
    if( rh.layer() == PFLayer::HF_HAD )
      return;
    if( rh.layer() == PFLayer::HF_EM )
      return;
  } 
  DetId detid( rh.detId() );

  const CaloSubdetectorTopology* topology = 0;
  const CaloSubdetectorGeometry* geometry = 0;
  const CaloSubdetectorGeometry* othergeometry = 0;
  
  switch( rh.layer() ) {
  case PFLayer::ECAL_ENDCAP: 
    topology = &endcapTopology;
    geometry = &endcapGeometry;
    break;
  case PFLayer::ECAL_BARREL: 
    topology = &barrelTopology;
    geometry = &barrelGeometry;
    break;
  case PFLayer::HCAL_ENDCAP:
    topology = &endcapTopology;
    geometry = &endcapGeometry;
    othergeometry = &barrelGeometry;
    break;
  case PFLayer::HCAL_BARREL1:
    topology = &barrelTopology;
    geometry = &barrelGeometry;
    othergeometry = &endcapGeometry;
    break;
  case PFLayer::PS1:
  case PFLayer::PS2:
    topology = &barrelTopology;
    geometry = &barrelGeometry;
    othergeometry = &endcapGeometry;
    break;
  default:
    assert(0);
  }
  
  assert( topology && geometry );

  CaloNavigator<DetId> navigator(detid, topology);

  DetId north = navigator.north();  
  
  DetId northeast(0);
  if( north != DetId(0) ) {
    northeast = navigator.east();  
  }
  navigator.home();


  DetId south = navigator.south();

  

  DetId southwest(0); 
  if( south != DetId(0) ) {
    southwest = navigator.west();
  }
  navigator.home();


  DetId east = navigator.east();
  DetId southeast;
  if( east != DetId(0) ) {
    southeast = navigator.south(); 
  }
  navigator.home();
  DetId west = navigator.west();
  DetId northwest;
  if( west != DetId(0) ) {   
    northwest = navigator.north();  
  }
  navigator.home();
    
  IDH i = sortedHits.find( north.rawId() );
  if(i != sortedHits.end() ) 
    rh.add4Neighbour( i->second );
  
  i = sortedHits.find( northeast.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
  
  i = sortedHits.find( south.rawId() );
  if(i != sortedHits.end() ) 
    rh.add4Neighbour( i->second );
    
  i = sortedHits.find( southwest.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
    
  i = sortedHits.find( east.rawId() );
  if(i != sortedHits.end() ) 
    rh.add4Neighbour( i->second );
    
  i = sortedHits.find( southeast.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
    
  i = sortedHits.find( west.rawId() );
  if(i != sortedHits.end() ) 
     rh.add4Neighbour( i->second );
   
  i = sortedHits.find( northwest.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
    

}


void 
PFRecHitProducerHCAL::findRecHitNeighboursCT
( reco::PFRecHit& rh, 
  const map<unsigned, unsigned >& sortedHits, 
  const CaloSubdetectorTopology& topology ) {
  //cout<<"------PFRecHitProducerHcaL:findRecHitNeighboursCT navigation value "<<navigation_HF_<<endl;
  //  cout<<"----------- rechit print out"<<endl;
  // if(( rh.layer() == PFLayer::HF_HAD )||(rh.layer() == PFLayer::HF_EM)) {  
    
  //    cout<<rh<<endl;
    //  }
  if(navigation_HF_ == false){
    if( rh.layer() == PFLayer::HF_HAD )
      return;
    if( rh.layer() == PFLayer::HF_EM )
      return;
  }
  CaloTowerDetId ctDetId( rh.detId() );
    

  vector<DetId> northids = topology.north(ctDetId);
  vector<DetId> westids = topology.west(ctDetId);
  vector<DetId> southids = topology.south(ctDetId);
  vector<DetId> eastids = topology.east(ctDetId);


  CaloTowerDetId badId;

  // all the following detids will be CaloTowerDetId
  CaloTowerDetId north;
  CaloTowerDetId northwest;
  CaloTowerDetId northwest2;
  CaloTowerDetId west;
  CaloTowerDetId west2;
  CaloTowerDetId southwest;
  CaloTowerDetId southwest2;
  CaloTowerDetId south;
  CaloTowerDetId southeast;
  CaloTowerDetId southeast2;
  CaloTowerDetId east;
  CaloTowerDetId east2;
  CaloTowerDetId northeast;
  CaloTowerDetId northeast2;
  
  // for north and south, there is no ambiguity : 1 or 0 neighbours
  
  switch( northids.size() ) {
  case 0: 
    break;
  case 1: 
    north = northids[0];
    break;
  default:
  stringstream err("PFRecHitProducerHCAL::findRecHitNeighboursCT : incorrect number of neighbours north: "); 
    err<<northids.size();
    throw( err.str() ); 
  }

  switch( southids.size() ) {
  case 0: 
    break;
  case 1: 
    south = southids[0];
    break;
  default:
  stringstream err("PFRecHitProducerHCAL::findRecHitNeighboursCT : incorrect number of neighbours south: "); 
    err<<southids.size();
    throw( err.str() ); 
  }
  
  // for east and west, one must take care 
  // of the pitch change in HCAL endcap.

  switch( eastids.size() ) {
  case 0: 
    break;
  case 1: 
    east = eastids[0];
    northeast = getNorth(east, topology);
    southeast = getSouth(east, topology);
    break;
  case 2:  
    // in this case, 0 is more on the north than 1
    east = eastids[0];
    east2 = eastids[1];
    northeast = getNorth(east, topology );
    southeast = getSouth(east2, topology);    
    northeast2 = getNorth(northeast, topology );
    southeast2 = getSouth(southeast, topology);    
    break;
  default:
  stringstream err("PFRecHitProducerHCAL::findRecHitNeighboursCT : incorrect number of neighbours eastids: "); 
    err<<eastids.size();
    throw( err.str() ); 
  }
  
  
  switch( westids.size() ) {
  case 0: 
    break;
  case 1: 
    west = westids[0];
    northwest = getNorth(west, topology);
    southwest = getSouth(west, topology);
    break;
  case 2:  
    // in this case, 0 is more on the north than 1
    west = westids[0];
    west2 = westids[1];
    northwest = getNorth(west, topology );
    southwest = getSouth(west2, topology );    
    northwest2 = getNorth(northwest, topology );
    southwest2 = getSouth(southwest, topology );    
    break;
  default:
  stringstream err("PFRecHitProducerHCAL::findRecHitNeighboursCT : incorrect number of neighbours westids: "); 
    err<< westids.size();
    throw( err.str() ); 
  }




  // find and set neighbours
    
  IDH i = sortedHits.find( north.rawId() );
  if(i != sortedHits.end() ) 
    rh.add4Neighbour( i->second );
  
  i = sortedHits.find( northeast.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
  
  i = sortedHits.find( northeast2.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
  
  i = sortedHits.find( south.rawId() );
  if(i != sortedHits.end() ) 
    rh.add4Neighbour( i->second );
    
  i = sortedHits.find( southwest.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
    
  i = sortedHits.find( southwest2.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
    
  i = sortedHits.find( east.rawId() );
  if(i != sortedHits.end() ) 
    rh.add4Neighbour( i->second );
    
  i = sortedHits.find( east2.rawId() );
  if(i != sortedHits.end() ) 
    rh.add4Neighbour( i->second );
    
  i = sortedHits.find( southeast.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
    
  i = sortedHits.find( southeast2.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );
    
  i = sortedHits.find( west.rawId() );
  if(i != sortedHits.end() ) 
     rh.add4Neighbour( i->second );
   
  i = sortedHits.find( west2.rawId() );
  if(i != sortedHits.end() ) 
     rh.add4Neighbour( i->second );
   
  i = sortedHits.find( northwest.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );

  i = sortedHits.find( northwest2.rawId() );
  if(i != sortedHits.end() ) 
    rh.add8Neighbour( i->second );

  //  cout<<"----------- rechit print out"<<endl;
  // if(( rh.layer() == PFLayer::HF_HAD )||(rh.layer() == PFLayer::HF_EM)) {  
    
  //   cout<<rh<<endl;
    //  }
}



DetId 
PFRecHitProducerHCAL::getSouth(const DetId& id, 
                               const CaloSubdetectorTopology& topology) {

  DetId south;
  vector<DetId> sids = topology.south(id);
  if(sids.size() == 1)
    south = sids[0];
  
  return south;
} 



DetId 
PFRecHitProducerHCAL::getNorth(const DetId& id, 
                               const CaloSubdetectorTopology& topology) {

  DetId north;
  vector<DetId> nids = topology.north(id);
  if(nids.size() == 1)
    north = nids[0];
  
  return north;
}