HadronOriginDecorator.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "DerivationFrameworkMCTruth/HadronOriginDecorator.h"
#include "StoreGate/WriteDecorHandle.h"
 
namespace DerivationFramework {
 
  StatusCode HadronOriginDecorator::initialize(){
    ATH_MSG_VERBOSE( "Initialize" );
    ATH_CHECK( m_particlesKey.initialize() );
    ATH_CHECK(m_originDecoratorKey.initialize());
    ATH_CHECK(m_Tool.retrieve());
    return StatusCode::SUCCESS;
  }
 
  StatusCode HadronOriginDecorator::addBranches(const EventContext& ctx) const{
    // Retrieve truth collections
    SG::ReadHandle<xAOD::TruthParticleContainer> truthParticles(m_particlesKey,ctx);
    if (!truthParticles.isValid()) {
      ATH_MSG_ERROR("Couldn't retrieve TruthParticle collection with name " << m_particlesKey);
      return StatusCode::FAILURE;
    }
 
    std::map<const xAOD::TruthParticle*, DerivationFramework::HadronOriginClassifier::HF_id>  hadronMap=m_Tool->GetOriginMap(ctx);
    SG::WriteDecorHandle<xAOD::TruthParticleContainer, int> originDecorator(m_originDecoratorKey, ctx);
    for (auto* truthParticle : *truthParticles) {
      originDecorator(*truthParticle) = (hadronMap.find(truthParticle)!=hadronMap.end()) ? static_cast<int>(hadronMap[truthParticle]) : 6;
    }
 
    return StatusCode::SUCCESS;
  }
 
}