MM_HitsTruthRelink.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#include "MM_HitsTruthRelink.h"
 
 
MM_HitsTruthRelink::MM_HitsTruthRelink(const std::string &name, ISvcLocator *pSvcLocator)
  : HitsTruthRelinkBase(name, pSvcLocator)
{
}
 
 
StatusCode MM_HitsTruthRelink::initialize()
{
  ATH_CHECK(HitsTruthRelinkBase::initialize());
 
  // Check and initialize keys
  ATH_CHECK( m_inputHitsKey.initialize() );
  ATH_MSG_VERBOSE("Initialized ReadHandleKey: " << m_inputHitsKey);
  ATH_CHECK( m_outputHitsKey.initialize() );
  ATH_MSG_VERBOSE("Initialized WriteHandleKey: " << m_outputHitsKey);
  return StatusCode::SUCCESS;
}
 
 
StatusCode MM_HitsTruthRelink::execute(const EventContext &ctx) const
{
  ATH_MSG_DEBUG("Doing truth relinking");
 
  SG::ReadHandle<MMSimHitCollection> inputCollection(m_inputHitsKey, ctx);
  if (!inputCollection.isValid()) {
    ATH_MSG_ERROR("Could not get input hits collection " << inputCollection.name() << " from store " << inputCollection.store());
    return StatusCode::FAILURE;
  }
  ATH_MSG_DEBUG("Found input hits collection " << inputCollection.name() << " in store " << inputCollection.store());
 
  SG::WriteHandle<MMSimHitCollection> outputCollection(m_outputHitsKey, ctx);
  ATH_CHECK(outputCollection.record(std::make_unique<MMSimHitCollection>()));
  if (!outputCollection.isValid()) {
    ATH_MSG_ERROR("Could not record output hits collection " << outputCollection.name() << " to store " << outputCollection.store());
    return StatusCode::FAILURE;
  }
  ATH_MSG_DEBUG("Recorded output hits collection " << outputCollection.name() << " in store " << outputCollection.store());
 
  // Do relinking
  int referenceId{};
  ATH_CHECK(getReferenceId(ctx, &referenceId));
 
  for (const MMSimHit &hit : *inputCollection) {
    HepMcParticleLink particleLink = updatedLink(ctx, hit.particleLink(), referenceId);
    int           id            = hit.MMId();
    double        time          = hit.globalTime();
    Amg::Vector3D position      = hit.globalPosition();
    int           pdgID         = hit.particleEncoding();
    double        kineticEnergy = hit.kineticEnergy();
    Amg::Vector3D direction     = hit.globalDirection();
    double        energyDeposit = hit.depositEnergy();
 
    outputCollection->Emplace(id, time, position, pdgID, kineticEnergy, direction, energyDeposit, particleLink);
  }
 
  return StatusCode::SUCCESS;
}