InDetUsedInFitTrackDecoratorTool.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// Local include(s):
#include "InDetUsedInFitTrackDecoratorTool/InDetUsedInFitTrackDecoratorTool.h"
 
// FrameWork include(s):
#include "AthLinks/ElementLink.h"
#include "AsgTools/CurrentContext.h"
#include "AsgDataHandles/ReadHandle.h"
#include "AsgDataHandles/WriteDecorHandle.h"
 
// STL include(s):
#include <algorithm>
#include <numeric>
#include <utility>
#include <vector>
 
// Constructor
InDet::InDetUsedInFitTrackDecoratorTool::InDetUsedInFitTrackDecoratorTool(const std::string& name) :
  asg::AsgTool(name)
{ }
 
// Destructor
InDet::InDetUsedInFitTrackDecoratorTool::~InDetUsedInFitTrackDecoratorTool()
= default;
 
// Initialize
StatusCode InDet::InDetUsedInFitTrackDecoratorTool::initialize()
{
  // Print configuration
  ATH_MSG_DEBUG("Initializing " << name() << "...");
  ATH_MSG_DEBUG("Using AMVFVerticesDecoName: " << m_vtxDecoKey);
  ATH_MSG_DEBUG("Using AMVFWeightsDecoName: "  << m_wgtDecoKey);
  ATH_MSG_DEBUG("Using TrackContainer: "       << m_trkContKey);
  ATH_MSG_DEBUG("Using VertexContainer: "      << m_vtxContKey);
 
  // Instantiate and initialize our container reads
  ATH_CHECK(m_trkContKey.initialize());
  ATH_CHECK(m_vtxContKey.initialize());
 
  // Instantiate and initialize our decorator writes
  ATH_CHECK(m_vtxDecoKey.initialize());
  ATH_CHECK(m_wgtDecoKey.initialize());
 
  return StatusCode::SUCCESS;
}
 
// Finalize
StatusCode InDet::InDetUsedInFitTrackDecoratorTool::finalize()
{
  ATH_MSG_DEBUG("Finalizing " << name() << "...");
 
  return StatusCode::SUCCESS;
}
 
void InDet::InDetUsedInFitTrackDecoratorTool::decorate(const xAOD::TrackParticleContainer* trkCont, const xAOD::VertexContainer* vtxCont, const EventContext& ctx) const
{
  ATH_MSG_DEBUG("In decorate(...) for " << name() <<  "...");
 
  // Decor handles for the AMVF vertices and weights
  SG::WriteDecorHandle<xAOD::TrackParticleContainer, std::vector<ElementLink<xAOD::VertexContainer>>> vtxDeco(m_vtxDecoKey, ctx);
  SG::WriteDecorHandle<xAOD::TrackParticleContainer, std::vector<float>> wgtDeco(m_wgtDecoKey, ctx);
  bool isVtxDeco_available = vtxDeco.isAvailable();
  if(isVtxDeco_available) return;
 
  //vector to collect results
  std::vector<std::pair<const xAOD::Vertex*,float> > vxWithWeight;
 
  // Iterate over our tracks:
  for (const xAOD::TrackParticle*  trk : *trkCont) {
    if (!trk) continue;
 
    vxWithWeight.clear();
 
    // Iterate over our vertices
    for (const auto *const vtx : *vtxCont) {
      if (!vtx) continue;
 
      //Search for vertex linked to this track
      const auto& trkLinks=vtx->trackParticleLinks();
      const size_t nTrackLinks=trkLinks.size();
      for (unsigned i=0;i<nTrackLinks;++i) {
        if (trkLinks[i].isValid() && *(trkLinks[i]) == trk) {//ptr comparison
          vxWithWeight.emplace_back(vtx,vtx->trackWeights()[i]);
          break; //Found pointer, quit loop
        }
      }
    }//end loop over vertices
 
    //sort by weight
    std::sort(vxWithWeight.begin(),vxWithWeight.end(),
        [](std::pair<const xAOD::Vertex*,float>& a, std::pair<const xAOD::Vertex*,float>& b){ return a.second > b.second; } );
 
    //split vector of pairs into two vectors in sync:
 
    std::vector<ElementLink<xAOD::VertexContainer>> AMVFVertices;
    std::vector<float> AMVFWeights;
    AMVFVertices.reserve(vxWithWeight.size());
    AMVFWeights.reserve(vxWithWeight.size());
 
    for (const auto& p : vxWithWeight) {
      AMVFVertices.emplace_back(p.first,*vtxCont,ctx);
      AMVFWeights.emplace_back(p.second);
    }
 
    // Actually perform the decoration
    vtxDeco(*trk) = std::move(AMVFVertices);
    wgtDeco(*trk) = std::move(AMVFWeights);
 
  } // end, loop over tracks
 
}
 
void InDet::InDetUsedInFitTrackDecoratorTool::decorate(const EventContext& ctx) const
{
  // Open our track container
  SG::ReadHandle<xAOD::TrackParticleContainer> trkCont(m_trkContKey, ctx);
  if (!trkCont.isValid())
    ATH_MSG_FATAL("Unable to retrieve xAOD::TrackParticleContainer " << m_trkContKey.key());
 
  // Open our vertex container
  SG::ReadHandle<xAOD::VertexContainer> vtxCont(m_vtxContKey, ctx);
  if (!vtxCont.isValid())
    ATH_MSG_FATAL("Unable to retrieve xAOD::VertexContainer " << m_vtxContKey.key());
 
  // Perform the decoration
  decorate(trkCont.get(), vtxCont.get(), ctx);
 
}