xAODTauRetriever.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "xAODJiveXML/xAODTauRetriever.h"
 
#include "xAODTau/TauJetContainer.h"
#include "xAODTau/TauxAODHelpers.h"
 
#include "AthenaKernel/Units.h"
using Athena::Units::GeV;
 
namespace JiveXML {

  xAODTauRetriever::xAODTauRetriever(const std::string& type,const std::string& name,const IInterface* parent):
    AthAlgTool(type,name,parent){}
 
 
  StatusCode xAODTauRetriever::initialize(){
    ATH_CHECK(m_keys.initialize());
    return StatusCode::SUCCESS;
  }
 
  
  StatusCode xAODTauRetriever::retrieve(ToolHandle<IFormatTool> &FormatTool) {
 
    ATH_MSG_DEBUG("In retrieve()");
 
    // Loop through the keys and retrieve the corresponding data
    for (const auto& key : m_keys) {
      SG::ReadHandle<xAOD::TauJetContainer> cont(key);
      if (cont.isValid()) {
    DataMap data = getData(&(*cont));
    if (FormatTool->AddToEvent(dataTypeName(), key.key() + "_xAOD", &data).isFailure()) {
      ATH_MSG_WARNING("Failed to add collection " << key.key());
    } else {
      ATH_MSG_DEBUG(" (" << key.key() << ") retrieved");
    }
      } else {
    ATH_MSG_WARNING("Collection " << key.key() << " not found in SG");
      }
    }
    return StatusCode::SUCCESS;
  }

  const DataMap xAODTauRetriever::getData(const xAOD::TauJetContainer* tauCont) {
 
    ATH_MSG_DEBUG("in getData()");
 
    DataMap DataMap;
 
    DataVect pt; pt.reserve(tauCont->size());
    DataVect phi; phi.reserve(tauCont->size());
    DataVect eta; eta.reserve(tauCont->size());
    DataVect charge; charge.reserve(tauCont->size());
 
    DataVect numTracks; numTracks.reserve(tauCont->size());
    DataVect isolFrac; isolFrac.reserve(tauCont->size());
    DataVect logLhRatio; logLhRatio.reserve(tauCont->size());
    DataVect label; label.reserve(tauCont->size());
    DataVect tracks; tracks.reserve(tauCont->size());
    DataVect sgKey; sgKey.reserve(tauCont->size());
    DataVect trackLinkCount; trackLinkCount.reserve(tauCont->size());
    DataVect isTauString; isTauString.reserve(tauCont->size());
 
    DataVect mass; mass.reserve(tauCont->size());
    DataVect energy; energy.reserve(tauCont->size());
 
    xAOD::TauJetContainer::const_iterator tauItr  = tauCont->begin();
    xAOD::TauJetContainer::const_iterator tauItrE = tauCont->end();
 
    int counter = 0;
 
    for (; tauItr != tauItrE; ++tauItr) {
      ATH_MSG_DEBUG("  Tau #" << counter++ << " : eta = "  << (*tauItr)->eta() << ", phi = "
            << (*tauItr)->phi());
 
      phi.emplace_back(DataType((*tauItr)->phi()));
      eta.emplace_back(DataType((*tauItr)->eta()));
      pt.emplace_back(DataType((*tauItr)->pt()/GeV));
 
      isolFrac.emplace_back(DataType( 1. ));
      logLhRatio.emplace_back(DataType( 1. ));
      label.emplace_back(DataType( "xAOD_tauJet_withoutQuality" ));
      charge.emplace_back(DataType( (*tauItr)->charge() ));
      isTauString.emplace_back(DataType( "xAOD_tauJet_withoutQuality" ));
 
      mass.emplace_back(DataType((*tauItr)->m()/GeV));
      energy.emplace_back( DataType((*tauItr)->e()/GeV ) );
 
      // track-vertex association code in xAOD from Nick Styles, Apr14:
      // InnerDetector/InDetRecAlgs/InDetPriVxFinder/InDetVxLinksToTrackParticles
 
      int trkCnt = 0;
#ifndef XAODTAU_VERSIONS_TAUTRACK_V1_H
      const std::vector< ElementLink< xAOD::TrackParticleContainer > > tpLinks =  (*tauItr)->trackLinks();
#else
      const std::vector< ElementLink< xAOD::TrackParticleContainer > > tpLinks =  xAOD::TauHelpers::trackParticleLinks(*tauItr);
#endif
 
      //iterating over the links
      unsigned int tp_size = tpLinks.size();
      numTracks.emplace_back(DataType( tp_size )); // same as:  (*tauItr)->nTracks()
      trackLinkCount.emplace_back(DataType( tp_size ));
      if(tp_size){ // links exist
    for(unsigned int tp = 0; tp<tp_size; ++tp)
      {
        ElementLink< xAOD::TrackParticleContainer >  tpl = tpLinks.at(tp);
 
        //checking a container name consitency
        //       if(tpl.key() == m_tracksName) // doesn't work. tpl.key is a number ?
 
        ATH_MSG_DEBUG("  tau #" << counter << " track association index: " << tpl.index()
              << ", collection : "  << tpl.key()
              << ", Tracks : " << tp  << " out of " << tp_size << ", own count: " << trkCnt++);
        tracks.emplace_back(DataType( tpl.index() ));
        sgKey.emplace_back( m_tracksName.value() );
      }
      } //links exist
 
    } // end TauIterator
 
    // four-vectors
    DataMap["phi"] = phi;
    DataMap["eta"] = eta;
    DataMap["pt"] = pt;
    DataMap["mass"] = mass;
    DataMap["energy"] = energy;
 
    DataMap["numTracks"] = numTracks;
    DataMap["isolFrac"] = isolFrac;
    DataMap["logLhRatio"] = logLhRatio;
    DataMap["label"] = label;
    DataMap["charge"] = charge;
    DataMap["trackLinkCount"] = trackLinkCount;
    DataMap["isTauString"] = isTauString;
 
    //This is needed once we know numTracks and associations:
    //If there had been any tracks, add a tag
    if ((numTracks.size()) != 0){
      //Calculate average number of tracks per vertex
      double NTracksPerVertex = tracks.size()*1./numTracks.size();
      std::string tag = "trackIndex multiple=\"" +DataType(NTracksPerVertex).toString()+"\"";
      DataMap[tag] = tracks;
      tag = "trackKey multiple=\"" +DataType(NTracksPerVertex).toString()+"\"";
      DataMap[tag] = sgKey;
    }
 
    //    DataMap["energy"] = energy;
    //    DataMap["mass"] = mass;
 
    ATH_MSG_DEBUG(dataTypeName() << " retrieved with " << phi.size() << " entries");
 
    return DataMap;
 
  }
 
 
} // JiveXML namespace