GepJetAlg.cxx

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/*
 *   Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 */
 
#include "./GepJetAlg.h"
 
// Interface to jet reconstruction objects
#include "./IJetMaker.h"
 
// concrete jet reconstruction classes.
#include "./ModAntikTJetMaker.h"
#include "./ConeJetMaker.h"
 
// input and output types
#include "./Cluster.h"
#include "./Jet.h"
 
#include "xAODEventInfo/EventInfo.h"
#include "xAODJet/JetAuxContainer.h"
 
GepJetAlg::GepJetAlg( const std::string& name, ISvcLocator* pSvcLocator ) :
    AthReentrantAlgorithm( name, pSvcLocator ){
 
}
 
 
StatusCode GepJetAlg::initialize() {
  ATH_MSG_INFO ("Initializing " << name() << "...");
  ATH_MSG_INFO ("Jet alg " << m_jetAlgName);
 
  // Initialize data access keys
  CHECK(m_caloClustersKey.initialize());
  CHECK(m_jFexSRJetsKey.initialize());
  CHECK(m_outputGepJetsKey.initialize());
 
  return StatusCode::SUCCESS;
}
 
 
StatusCode GepJetAlg::execute(const EventContext& context) const {
  ATH_MSG_DEBUG ("Executing " << name() << "...");
  
  
  SG::WriteHandle<xAOD::JetContainer>
    h_outputJets = SG::makeHandle(m_outputGepJetsKey, context);
 
 
  CHECK(h_outputJets.record(std::make_unique<xAOD::JetContainer>(),
                std::make_unique<xAOD::JetAuxContainer>()));
    
  // read in clusters
  auto h_caloClusters = SG::makeHandle(m_caloClustersKey, context);
  CHECK(h_caloClusters.isValid());
  ATH_MSG_DEBUG("Read in " << h_caloClusters->size() << " clusters");
 
  const auto& clusters = *h_caloClusters; 
 
 
 
  std::vector<Gep::Cluster> gepClusters;
  std::transform(clusters.cbegin(),
         clusters.cend(),
         std::back_inserter(gepClusters),
         [](const auto& cluster){
           return Gep::Cluster(cluster->p4());});
         
 
 
  // create a  jet maker
  std::unique_ptr<Gep::IJetMaker> jetMaker{};
  
 
  if ( m_jetAlgName=="ModAntikT" ) {
    jetMaker.reset(new Gep::ModAntikTJetMaker());
  }
  
  else if ( m_jetAlgName=="Cone" ) {
 
    // Use jJFexSR RoIs as seeds
    auto h_seeds = SG::makeHandle(m_jFexSRJetsKey, context);
    CHECK(h_seeds.isValid());
    ATH_MSG_DEBUG("No of seeds "<< h_seeds->size());
    jetMaker.reset(new Gep::ConeJetMaker(0.4, *h_seeds));
    
  } else {
    ATH_MSG_ERROR( "Unknown JetMaker " <<  m_jetAlgName);
    return StatusCode::FAILURE;
  }
 
  ATH_MSG_DEBUG( "jet maker: " << jetMaker->toString());
  
  std::vector<Gep::Jet> gepJets = jetMaker->makeJets( gepClusters );
  
  ATH_MSG_DEBUG("Number of jets found for " <<
         m_jetAlgName << " " <<gepJets.size());
 
  // if no jets were found, skip event
  if( gepJets.empty() ){
    return StatusCode::SUCCESS;
  }
  
  // store gep jets in athena format
  for(const auto& gjet: gepJets){
    
    std::unique_ptr<xAOD::Jet> xAODJet{new xAOD::Jet()};
    xAOD::Jet* p_xAODJet = xAODJet.get();
 
    // store the xAOD::Jet in the output container to prepare the Aux container
    // The move invalids the unique_ptr, but we still have the bare pointer
    // which allows the updating of the xAODJet from the gep jet data.
    h_outputJets->push_back(std::move(xAODJet));
    
    xAOD::JetFourMom_t p4;
    p4.SetPt(gjet.vec.Pt());
    p4.SetEta(gjet.vec.Eta());
    p4.SetPhi(gjet.vec.Phi());
    p4.SetM(gjet.vec.M());
 
    p_xAODJet->setJetP4(p4);
    
    p_xAODJet->setAttribute("RCut", gjet.radius);
    p_xAODJet->setAttribute("SeedEta", gjet.seedEta); // < gep attributes
    p_xAODJet->setAttribute("SeedPhi", gjet.seedPhi); //
    p_xAODJet->setAttribute("SeedEt", gjet.seedEt); //
 
    for (const auto& i: gjet.constituentsIndices) {
      p_xAODJet->addConstituent(clusters.at(i));
    }
    
  }
    
  return StatusCode::SUCCESS;
}