PFSimulateTruthShowerTool.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
#include "PFSimulateTruthShowerTool.h"
 
#include "eflowRecCluster.h"
#include "eflowRecTrack.h"
#include "eflowTrackClusterLink.h"
 
#include "xAODTruth/TruthParticleContainer.h"
 
PFSimulateTruthShowerTool::PFSimulateTruthShowerTool(const std::string& type,
                                                       const std::string& name,
                                                       const IInterface* parent) :
                                                       AthAlgTool(type, name, parent){}
 
StatusCode PFSimulateTruthShowerTool::initialize(){
 
    ATH_CHECK(m_tileActiveCaloCalibrationHitReadHandleKey.initialize());
    ATH_CHECK(m_lArActiveCaloCalibrationHitReadHandleKey.initialize());
 
    return StatusCode::SUCCESS;
}
 
StatusCode PFSimulateTruthShowerTool::finalize(){
    return StatusCode::SUCCESS;
}
 
void PFSimulateTruthShowerTool::simulateShower(eflowCaloObject& thisEFlowCaloObject) const{
 
  SG::ReadHandle<CaloCalibrationHitContainer> tileActiveCaloCalibrationHitReadHandle(m_tileActiveCaloCalibrationHitReadHandleKey);
  if (!tileActiveCaloCalibrationHitReadHandle.isValid()){
    ATH_MSG_WARNING("TileActiveCaloCalibrationHitReadHandle is not valid");
    return;
  }
 
  SG::ReadHandle<CaloCalibrationHitContainer> lArActiveCaloCalibrationHitReadHandle(m_lArActiveCaloCalibrationHitReadHandleKey);
  if (!lArActiveCaloCalibrationHitReadHandle.isValid()){
    ATH_MSG_WARNING("lArActiveCaloCalibrationHitReadHandle is not valid");
    return;
  }
 
    for (unsigned int trackCounter = 0; trackCounter < thisEFlowCaloObject.nTracks();trackCounter++){
        
        eflowRecTrack* thisTrack = thisEFlowCaloObject.efRecTrack(trackCounter);
 
        typedef ElementLink<xAOD::TruthParticleContainer> TruthLink;
 
        const static SG::Accessor<TruthLink> truthLinkAccessor("truthParticleLink");
        //if truthLink not valid don't print a WARNING because this is an expected condition as discussed here:
        //https://indico.cern.ch/event/795039/contributions/3391771/attachments/1857138/3050771/TruthTrackFTAGWS.pdf
        TruthLink truthLink = truthLinkAccessor(*(thisTrack->getTrack()));
        
        if (!truthLink.isValid()) continue;
 
        //get uniqueID of particle
        const int uniqueID = (*truthLink)->uid();
 
        std::map<Identifier,double> identifierToTruthEnergyMap;
 
        for (auto thisCalibHit : *tileActiveCaloCalibrationHitReadHandle) this->fillMap(identifierToTruthEnergyMap,uniqueID,*thisCalibHit);
        for (auto thisCalibHit : *lArActiveCaloCalibrationHitReadHandle) this->fillMap(identifierToTruthEnergyMap,uniqueID,*thisCalibHit);
 
        //find the matched clusters
        for (auto thisLink : thisTrack->getClusterMatches()){
            for (auto thisCell : *(thisLink->getCluster()->getCluster()->getOwnCellLinks())){
                //look up the truth energy for this cell
                if (identifierToTruthEnergyMap.count(thisCell->ID()) == 0) continue;
                double truthEnergy = identifierToTruthEnergyMap[thisCell->ID()];
                thisTrack->insertTruthEnergyPair(thisCell,truthEnergy);
            }//cell loop
        }//matched cluster loop
    }//track loop
}
 
void PFSimulateTruthShowerTool::fillMap(std::map<Identifier,double>& identifierToTruthEnergyMap, int uniqueID, const CaloCalibrationHit& thisCalibHit) const{
  if (HepMC::uniqueID(thisCalibHit) == uniqueID) {
        Identifier thisIdentifier = thisCalibHit.cellID();
        unsigned int count = identifierToTruthEnergyMap.count(thisIdentifier);
        if (0 == count) identifierToTruthEnergyMap[thisIdentifier] = thisCalibHit.energyEM() + thisCalibHit.energyNonEM();
        else identifierToTruthEnergyMap[thisIdentifier] += (thisCalibHit.energyEM() + thisCalibHit.energyNonEM());
    }
}