InDetSecVtxFinder.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
/***************************************************************************
                         InDetSecVtxFinder.cxx  -  Description
                             -------------------
    begin   : Nov 10, 2016
    authors : Lianyou SHAN ( IHEP-Beijing ) Neža Ribarič (Lancaster university, UK)
    email   : shanly@mail.ihep.ac.cn, neza.ribaric@cern.ch
    changes : Changed name from InDetInclusiveSecVtx, added the option to chose the vertexing tool (ISV,AMVF) 
 ***************************************************************************/
#include "InDetSecVtxFinder/InDetSecVtxFinder.h"
 
 
// forward declares
 
#include "xAODTracking/Vertex.h"
#include "xAODTracking/VertexAuxContainer.h"
#include "xAODTracking/TrackParticle.h"
#include "xAODTracking/TrackParticleAuxContainer.h"
#include "VxSecVertex/VxSecVertexInfo.h"
// normal includes
#include "TrkParticleBase/TrackParticleBaseCollection.h"
#include "AthContainers/ConstAccessor.h"
#include "GaudiKernel/EventContext.h"
 
 
namespace InDet
{
 
  InDetSecVtxFinder::InDetSecVtxFinder ( const std::string &n, ISvcLocator *pSvcLoc ) : AthAlgorithm ( n, pSvcLoc ),
      // for summary output at the end
      m_numEventsProcessed(0),
      m_totalNumVerticesWithoutDummy(0)
  {}
 
  
  StatusCode InDetSecVtxFinder::initialize()
  {
    /* Get the VertexFinderTool */
    ATH_CHECK( m_AdaptiveMultiVertexFinderTool.retrieve());

 
    ATH_CHECK(m_inputTrackParticles.initialize());
    ATH_CHECK(m_outputSecondaryVertices.initialize());
    ATH_CHECK(m_inputPrimaryVertices.initialize());
   
    ATH_MSG_DEBUG("Initialization successful");
  
    return StatusCode::SUCCESS;
  }
 
 
  StatusCode InDetSecVtxFinder::execute()
  {
    m_numEventsProcessed++;
 
    const EventContext& ctx = Gaudi::Hive::currentContext();
 
    SG::WriteHandle<xAOD::VertexContainer> outputVertices (m_outputSecondaryVertices, ctx);
 
    xAOD::VertexContainer* theXAODContainer = nullptr;
    xAOD::VertexAuxContainer* theXAODAuxContainer = nullptr;
    std::pair<xAOD::VertexContainer*,xAOD::VertexAuxContainer*> theXAODContainers
    = std::make_pair( theXAODContainer, theXAODAuxContainer );
 
    // retrieve the PRIMARY Vertex
 
    SG::ReadHandle<xAOD::VertexContainer> vtxCont(m_inputPrimaryVertices, ctx);
    
    if(vtxCont.isValid()){
      const xAOD::Vertex *privtx = static_cast< const xAOD::Vertex * >( *(vtxCont->begin()) );
      static const SG::ConstAccessor<float> zAcc ("z");
      if( privtx->vertexType() != xAOD::VxType::PriVtx || privtx->nTrackParticles() < 2 || !zAcc.isAvailable(*privtx)){
        ATH_MSG_WARNING(" Illed Primary vertex, keeping privtx_z0 = 0  ");
      }
      else{
    m_AdaptiveMultiVertexFinderTool->setPrimaryVertexPosition( privtx->position().x(), privtx->position().y(), privtx->position().z());
      }  
    }
 
    else{
      ATH_MSG_WARNING("couldn't retrieve Primary vertex, keeping privtx_z0 = 0 ");
    }
 
    std::unique_ptr<Trk::VxSecVertexInfo> foundVrts;
    SG::ReadHandle<xAOD::TrackParticleContainer> trackParticleCollection(m_inputTrackParticles, ctx);
    ATH_CHECK(trackParticleCollection.isValid());
    theXAODContainers = m_AdaptiveMultiVertexFinderTool->findVertex ( trackParticleCollection.cptr());
    
    // now  re-merge and resort the vertex container and store to SG
    xAOD::VertexContainer* myVertexContainer = nullptr;
    xAOD::VertexAuxContainer* myVertexAuxContainer = nullptr;
    std::pair<xAOD::VertexContainer*, xAOD::VertexAuxContainer*> myVxContainers = std::make_pair( myVertexContainer, myVertexAuxContainer );
    ATH_MSG_DEBUG("Vertexing done, sorting the vertex container");
    if (theXAODContainers.first) {
      //sort xAOD::Vertex container
      
      myVxContainers.first = theXAODContainers.first;
      myVxContainers.second = theXAODContainers.second;
 
      if (myVxContainers.first == 0) {
        ATH_MSG_WARNING("Vertex container has no associated store.");
 
        return StatusCode::SUCCESS;
      }
 
      if (not myVxContainers.first->hasStore()) {
        ATH_MSG_WARNING("Vertex container has no associated store.");
 
        return StatusCode::SUCCESS;
      }
 
      ATH_MSG_DEBUG("Successfully reconstructed " << myVxContainers.first->size()-1 << " vertices (excluding dummy)");
      m_totalNumVerticesWithoutDummy += (myVxContainers.first->size()-1); 
 
    }
 
    ATH_CHECK(outputVertices.record(std::unique_ptr<xAOD::VertexContainer>(myVxContainers.first),std::unique_ptr<xAOD::VertexAuxContainer>(myVxContainers.second)));
  
      
    ATH_MSG_DEBUG( "Recorded Vertices with key: " << m_outputSecondaryVertices.key() );
 
    return StatusCode::SUCCESS;
  } 
  
  StatusCode InDetSecVtxFinder::finalize()
  {
    ATH_MSG_DEBUG("Summary from Secondary Vertex Finder (InnerDetector/InDetRecAlgs/InDetSecVtxFinder)");
    ATH_MSG_DEBUG("=== " << m_totalNumVerticesWithoutDummy << " vertices recoed in " << m_numEventsProcessed << " events (excluding dummy).");
 
    if (m_numEventsProcessed!=0) {
      ATH_MSG_DEBUG( "=== " << double(m_totalNumVerticesWithoutDummy)/double(m_numEventsProcessed) << " vertices per event (excluding dummy).");
    }
    
    return StatusCode::SUCCESS;
  }
  
} // end namespace InDet