GNNAuxTaskDecoratorAlg.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#include "FlavorTagDiscriminants/GNNAuxTaskDecoratorAlg.h"
 
#include "xAODTracking/TrackParticle.h"
#include "xAODBTagging/BTagging.h"
 
#include "StoreGate/WriteDecorHandle.h"
#include "StoreGate/ReadDecorHandle.h"
 
#include <vector>
#include <map>
 
namespace FlavorTagDiscriminants {
  GNNAuxTaskDecoratorAlg::GNNAuxTaskDecoratorAlg(
    const std::string& name, ISvcLocator* svcloc):
    AthReentrantAlgorithm(name, svcloc)
  {
  }
  StatusCode GNNAuxTaskDecoratorAlg::initialize() {
    ATH_CHECK(m_jetContainerKey.initialize());
    ATH_CHECK(m_trackContainerKey.initialize());
 
    m_trackLinksKey = m_jetContainerKey.key() + "." + m_trackLinksKey.key();
    ATH_CHECK(m_trackLinksKey.initialize());
 
    m_trackAuxTasksDecorKeys.reserve(m_trackAuxTasks.size());
    m_readDecorKeys.reserve(m_trackAuxTasks.size());
    for (std::pair<std::string,std::string> auxTask : m_trackAuxTasks) {
      SG::WriteDecorHandleKey<xAOD::TrackParticleContainer>& trackAuxTaskDecorKey = m_trackAuxTasksDecorKeys.emplace_back(this, name()+auxTask.second, m_trackContainerKey.key()+"."+auxTask.second, "");
      SG::ReadDecorHandleKey<xAOD::BTaggingContainer>& readDecorKey = m_readDecorKeys.emplace_back(this, name()+auxTask.first, m_jetContainerKey.key()+"."+auxTask.first, "");
      ATH_CHECK(trackAuxTaskDecorKey.initialize());
      ATH_CHECK(readDecorKey.initialize());
    }
 
    return StatusCode::SUCCESS;
  }
 
  StatusCode GNNAuxTaskDecoratorAlg::execute(const EventContext& ctx) const {
    // define the required WriteDecorHandle objects
    std::vector<SG::WriteDecorHandle<xAOD::TrackParticleContainer, char>> track_wdhs;
    for (const auto& wdhk: m_trackAuxTasksDecorKeys) {
      track_wdhs.emplace_back(wdhk, ctx);
    }
 
    // define the required ReadDecorHandle objects
    std::vector<SG::ReadDecorHandle<xAOD::BTaggingContainer, std::vector<char>>> jet_rdhs;
    for (const auto& rdhk: m_readDecorKeys) {
      jet_rdhs.emplace_back(rdhk, ctx);
    }
 
    // decorate all the tracks with defaults values
    SG::ReadHandle<xAOD::TrackParticleContainer> tracks(m_trackContainerKey, ctx);
    ATH_CHECK(tracks.isValid());
 
    for (const auto& track: *tracks) {
      for (auto& wdh: track_wdhs) {
        char value = -1;
        wdh(*track) = value;
      }
    }
 
    // adding actual aux task results to a subset of tracks
    SG::ReadHandle<xAOD::BTaggingContainer> jets(m_jetContainerKey, ctx);
    ATH_CHECK(jets.isValid());
    SG::ReadDecorHandle<xAOD::TrackParticleContainer, std::vector<ElementLink<xAOD::TrackParticleContainer>>> trackLinks_rdh(m_trackLinksKey, ctx);
    for (const auto& jet: *jets) {
      auto irdh = jet_rdhs.begin();
      auto iwdh = track_wdhs.begin();
      for (; irdh != jet_rdhs.end() && iwdh != track_wdhs.end(); ++irdh, ++iwdh) {
        std::vector<char> values = (*irdh)(*jet);
        auto& trackLinks = trackLinks_rdh(*jet);
        if (values.size() != trackLinks.size()) {
            throw std::logic_error("Track aux task output size " + std::to_string(values.size()) + " doesn't match the size of track list " + std::to_string(trackLinks.size()));
        }
        std::vector<ElementLink<xAOD::TrackParticleContainer>>::const_iterator it = trackLinks.begin();
        std::vector<char>::const_iterator ival = values.begin();
        for (; it != trackLinks.end() && ival != values.end(); ++it, ++ival) {
          (*iwdh)(***it) = *ival;
        }
      }
    }
 
    return StatusCode::SUCCESS;
  }
 
  StatusCode GNNAuxTaskDecoratorAlg::finalize() {
    return StatusCode::SUCCESS;
  }
 
}