WriteExampleElectron.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "WriteExampleElectron.h"
 
// the user data-class definitions
#include "AthenaPoolExampleData/ExampleElectron.h"
#include "AthenaPoolExampleData/ExampleElectronAuxContainer.h"
#include "AthenaPoolExampleData/ExampleElectronContainer.h"
#include "AthenaPoolExampleData/ExampleHitContainer.h"
#include "AthenaPoolExampleData/ExampleTrackContainer.h"
#include "GaudiKernel/EventContext.h"
#include "StoreGate/WriteDecorHandle.h"
#include "StoreGate/WriteHandle.h"
 
using namespace AthPoolEx;
 
//___________________________________________________________________________
WriteExampleElectron::WriteExampleElectron(const std::string& name,
                                           ISvcLocator* pSvcLocator)
    : AthReentrantAlgorithm(name, pSvcLocator) {}
 
//___________________________________________________________________________
StatusCode WriteExampleElectron::initialize() {
  ATH_MSG_INFO(name() << ": in initialize()");
 
  ATH_CHECK(m_exampleElectronContainerKey.initialize());
  ATH_CHECK(m_exampleTrackKey.initialize());
  ATH_CHECK(m_exampleHitKey.initialize());
  ATH_CHECK(m_decor1Key.initialize());
  ATH_CHECK(m_decor2Key.initialize());
 
  return StatusCode::SUCCESS;
}
 
//___________________________________________________________________________
StatusCode WriteExampleElectron::execute(const EventContext& ctx) const {
  ATH_MSG_DEBUG("WriteExampleElectron in execute()");
  std::size_t idx_trk = 0;
  float idx_decor = 0.0f;
 
  auto elecCont = std::make_unique<xAOD::ExampleElectronContainer>();
  auto elecStore = std::make_unique<xAOD::ExampleElectronAuxContainer>();
  elecCont->setStore(elecStore.get());
 
  /*
   * Convert ExampleTrack to xAOD::ExampleElectron
   */
 
  SG::ReadHandle<ExampleTrackContainer> trackCont(m_exampleTrackKey, ctx);
 
  elecCont->push_back(std::make_unique<xAOD::ExampleElectron>());
 
  for (const ExampleTrack* track : *trackCont) {
    ATH_MSG_INFO(name() << ": track # " << idx_trk << " pT = " << track->getPT()
                        << ".");
 
    // proceed to take this tracks pT
    elecCont->back()->setPt(track->getPT());
 
    // Print out the pT that's being saved
    ATH_MSG_INFO(name() << ": track # " << idx_trk
                        << "is an electron with pT = " << elecCont->back()->pt()
                        << ";");
 
    idx_trk++;
  }
 
  SG::WriteHandle<xAOD::ExampleElectronContainer> objs(
      m_exampleElectronContainerKey, ctx);
  ATH_CHECK(objs.record(std::move(elecCont), std::move(elecStore)));
 
  /*
   * Writing Decorations
   */
 
  // WriteDecorHandle for the decoration 'TestContainer.decor1'
  SG::WriteDecorHandle<xAOD::ExampleElectronContainer, float> hdl1(m_decor1Key,
                                                                   ctx);
 
  // And for the second decoration 'TestContainer.decor2'
  SG::WriteDecorHandle<xAOD::ExampleElectronContainer, float> hdl2(m_decor2Key,
                                                                   ctx);
 
  if (objs.isValid()) {
    // Access example electrons
    for (const xAOD::ExampleElectron* obj : *objs) {
      hdl1(*obj) = 115.9 + 12.34 * idx_decor;  // decor1
      hdl2(*obj) = 114.9 + idx_decor;          // decor2
 
      // Verify writing out two decorations
      ATH_MSG_INFO(name() << ": DecorationWriter: decor1 = " << hdl1(*obj)
                          << ", decor2 = " << hdl2(*obj) << ". ");
      idx_decor++;
    }
  } else {
    ATH_MSG_ERROR(name() << ": objs is not valid");
  }
 
  ATH_MSG_INFO(name() << ": registered all data");
  return StatusCode::SUCCESS;
}
 
//___________________________________________________________________________
StatusCode WriteExampleElectron::finalize() {
  ATH_MSG_INFO(name() << ": in finalize()");
  return StatusCode::SUCCESS;
}