ParticleSelectionAlg.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
// ParticleSelectionAlg.cxx
// Implementation file for class ParticleSelectionAlg
// Author: Karsten Koeneke <karsten.koeneke@cern.ch>
 
// EventUtils includes
#include "ParticleSelectionAlg.h"
 
// FrameWork includes
#include "Gaudi/Property.h"
#include "DerivationFrameworkInterfaces/IAugmentationTool.h"
 
// EDM includes
#include "EventInfo/EventStreamInfo.h"
#include "xAODBase/IParticleContainer.h"
#include "xAODBase/IParticle.h"
#include "xAODCore/AuxContainerBase.h"
#include "xAODEgamma/PhotonContainer.h"
#include "xAODEgamma/PhotonAuxContainer.h"
#include "xAODEgamma/ElectronContainer.h"
#include "xAODEgamma/ElectronAuxContainer.h"
#include "xAODMuon/MuonContainer.h"
#include "xAODMuon/MuonAuxContainer.h"
#include "xAODTau/TauJetContainer.h"
#include "xAODTau/TauJetAuxContainer.h"
#include "xAODJet/JetContainer.h"
#include "xAODJet/JetAuxContainer.h"
#include "xAODPFlow/PFOContainer.h"
#include "xAODPFlow/PFOAuxContainer.h"
#include "xAODTracking/NeutralParticleContainer.h"
#include "xAODTracking/NeutralParticleAuxContainer.h"
#include "xAODTracking/TrackParticleContainer.h"
#include "xAODTracking/TrackParticleAuxContainer.h"
#include "xAODParticleEvent/ParticleContainer.h"
#include "xAODParticleEvent/ParticleAuxContainer.h"
#include "xAODCaloEvent/CaloClusterContainer.h"
#include "xAODCaloEvent/CaloClusterAuxContainer.h"
#include "xAODTruth/TruthParticleContainer.h"
#include "xAODTruth/TruthParticleAuxContainer.h"
#include "xAODParticleEvent/CompositeParticleContainer.h"
#include "xAODParticleEvent/CompositeParticleAuxContainer.h"
#include "xAODCutFlow/CutBookkeeper.h"
#include "xAODCutFlow/CutBookkeeperContainer.h"
#include "xAODCutFlow/CutBookkeeperAuxContainer.h"
 
// Public methods:
 
// Constructors
ParticleSelectionAlg::ParticleSelectionAlg( const std::string& name,
                                            ISvcLocator* pSvcLocator ) :
  ExpressionParserUser< ::AthAnalysisAlgorithm>( name, pSvcLocator )
{
  m_cutBKCName = name; // cppcheck-suppress useInitializationList; deprecated Property constructor
}
 
 
 
// Destructor
ParticleSelectionAlg::~ParticleSelectionAlg()
{}
 
 
 
// Athena Algorithm's Hooks
StatusCode ParticleSelectionAlg::initialize()
{
  ATH_MSG_DEBUG ("Initializing " << name() << "...");
 
  // Print out the used configuration
  ATH_MSG_DEBUG ( " using EventInfo = " << m_evtInfoName );
  ATH_MSG_DEBUG ( " using InputContainer = " << m_inCollKey );
  ATH_MSG_DEBUG ( " using OutputContainer = " << m_outCollKey );
  ATH_MSG_DEBUG ( " using WriteSplitOutputContainer = " << m_writeSplitAux );
  ATH_MSG_DEBUG ( " using OutputContainerOwnershipPolicy = " << m_outOwnPolicyName );
  ATH_MSG_DEBUG ( " using SelectionToolList = " << m_selTools );
  ATH_MSG_DEBUG ( " using Selection = " << m_selection );
  ATH_MSG_DEBUG ( " using DoCutBookkeeping = " << m_doCutFlow );
  ATH_MSG_DEBUG ( " using CutBookkeeperContainer = " << m_cutBKCName );
 
  
  // initialize proxy loaders for expression parsing
  if ( !(m_selection.value().empty()) ){
     ATH_CHECK( initializeParser(m_selection.value()));
  }
 
  // initialize the counters
  m_nEventsProcessed = 0;
 
  // Determine the ownership policy of the output container
  if ( m_outOwnPolicyName.value() == "OWN_ELEMENTS" ) {
    m_outOwnPolicy = SG::OWN_ELEMENTS;
  }
  else if ( m_outOwnPolicyName.value() == "VIEW_ELEMENTS" ) {
    m_outOwnPolicy = SG::VIEW_ELEMENTS;
  }
  else {
    ATH_MSG_ERROR("Unrecognized ownership policy for the output container: " << m_outOwnPolicyName );
    return StatusCode::FAILURE;
  }
 
  // Retrieve all tools
  ATH_CHECK( m_selTools.retrieve() );
 
  ATH_MSG_DEBUG ( "==> done with initialize " << name() << "..." );
  return StatusCode::SUCCESS;
}
 
 
 
StatusCode ParticleSelectionAlg::finalize()
{
  ATH_MSG_DEBUG ("Finalizing " << name() << "...");
 
  // Release all tools and services
  ATH_CHECK( m_selTools.release() );
 
  ATH_CHECK( finalizeParser() );
 
  return StatusCode::SUCCESS;
}
 
 
 
StatusCode ParticleSelectionAlg::start()
{
  ATH_MSG_DEBUG ("start " << name() << "...");
 
  // Nothing to be done here, if cut-flow bookkeeping was not requested
  if (!m_doCutFlow){ return StatusCode::SUCCESS; }
 
  // Get some properties from the input meta data
  std::string inputStreamName = "Stream";
  const CLID clid = ClassID_traits<EventStreamInfo>::ID();
  std::vector<std::string> streamNameList;
  inputMetaStore()->keys(clid, streamNameList);
  if ( streamNameList.size() >=1 ){ inputStreamName = streamNameList[0]; }
  // Get the processing cycle number that we need to set for us
  int maxInputCycle = -1;
  if ( inputMetaStore()->contains<xAOD::CutBookkeeperContainer>(m_cutBKCName.value()) ){
    xAOD::CutBookkeeperContainer* inCutBKCont = nullptr;
    ATH_CHECK( inputMetaStore()->retrieve(inCutBKCont, m_cutBKCName.value() ) );
    if (inCutBKCont){
      maxInputCycle = inCutBKCont->maxCycle();
    }
  }
  if (maxInputCycle<0){ maxInputCycle = 0; }
  else { maxInputCycle += 1; }
 
  // Check if we already have a container in the output meta-data store
  xAOD::CutBookkeeperContainer* cutBKCont = nullptr;
  if ( outputMetaStore()->contains<xAOD::CutBookkeeperContainer>(m_cutBKCName.value()) ){
    ATH_CHECK( inputMetaStore()->retrieve(cutBKCont, m_cutBKCName.value() ) );
    // Set the index where we will start having our CutBookkeepers in this container
    m_cutBKStartIdx = cutBKCont->size();
  }
  else {
    // Create and register the container that will hold the cut-flow information
    cutBKCont = new xAOD::CutBookkeeperContainer();
    // Take care of the peculiarities of the new xAOD EDM, i.e., create the needed AuxStore
    xAOD::CutBookkeeperAuxContainer* cutBKAuxCont = new xAOD::CutBookkeeperAuxContainer();
    cutBKCont->setStore( cutBKAuxCont ); //gives it a new associated aux container
    ATH_CHECK( outputMetaStore()->record( cutBKCont, m_cutBKCName.value() ) );
    ATH_CHECK( outputMetaStore()->record( cutBKAuxCont, m_cutBKCName.value()+"Aux." ) );
    ATH_MSG_VERBOSE( "Recorded xAOD::CutBookkeeperContainer " << m_cutBKCName.value() << "Aux." );
  }
 
  //------------- for the AsgSelectionTools --------------
  // Now, register one CutBookkeeper per cut that will be applied.
  // For each of the registered tools, get the TAccept and ask it for all known cuts.
  for ( std::size_t toolIdx=0; toolIdx < m_selTools.size(); ++toolIdx ){
    const ToolHandle<IAsgSelectionTool>& tool = m_selTools[toolIdx];
    // Fill the index bookkeeping at what index in the CutBookkeeperContainer
    // the CutBookkeepers for this tool start.
    m_selToolIdxOffset.push_back( cutBKCont->size() );
    // Get some needed quantities
    const std::string toolName = tool->name();
    const asg::AcceptInfo& acceptInfo = tool->getAcceptInfo();
    const unsigned int nCuts = acceptInfo.getNCuts();
    for ( unsigned int iCut=0; iCut<nCuts; ++iCut ){
      // Get the name and description of this cut
      const std::string cutName  = acceptInfo.getCutName(iCut);
      const std::string cutDescr = acceptInfo.getCutDescription(iCut);
      // Create a new xAOD::CutBookkeeper and add it to the container
      xAOD::CutBookkeeper* cutBK = new xAOD::CutBookkeeper();
      cutBKCont->push_back(cutBK);
      // Now, set its properties
      cutBK->setName(toolName+"_"+cutName);
      cutBK->setDescription(cutDescr);
      cutBK->setCutLogic(xAOD::CutBookkeeper::CutLogic::REQUIRE); // Each cut must be passed, thus REQUIRE, i.e, logical AND
      cutBK->setInputStream(inputStreamName);
      cutBK->setCycle(maxInputCycle);
    }
  }
 
  //------------- for the ExpressionParsing in this algorithm --------------
  if ( !(m_selection.value().empty()) ){
    // Create a new xAOD::CutBookkeeper and add it to the container
    xAOD::CutBookkeeper* cutBK = new xAOD::CutBookkeeper();
    cutBKCont->push_back(cutBK);
    // Now, set its properties
    cutBK->setName(this->name());
    cutBK->setDescription(m_selection.value());
    cutBK->setCutLogic(xAOD::CutBookkeeper::CutLogic::REQUIRE); // Each cut must be passed, thus REQUIRE, i.e, logical AND
    cutBK->setInputStream(inputStreamName);
    cutBK->setCycle(maxInputCycle);
    m_idxSelParster = cutBK->index();
  }
 
  return StatusCode::SUCCESS;
}
 
 
 
 
StatusCode ParticleSelectionAlg::execute()
{
  // Increase the event counter
  ++m_nEventsProcessed;
  // Simple status message at the beginning of each event execute,
  ATH_MSG_DEBUG ( "==> execute " << name() << " on " << m_nEventsProcessed << ". event..." );
 
 
  // Figure out what type the input container has, if we didn't do it yet
  if ( m_contType == UNKNOWN ){
    if ( evtStore()->contains<xAOD::PhotonContainer>(m_inCollKey.value()) ){ m_contType = PHOTON; }
    else if ( evtStore()->contains<xAOD::ElectronContainer>(m_inCollKey.value()) ){ m_contType = ELECTRON; }
    else if ( evtStore()->contains<xAOD::MuonContainer>(m_inCollKey.value()) ){ m_contType = MUON; }
    else if ( evtStore()->contains<xAOD::TauJetContainer>(m_inCollKey.value()) ){ m_contType = TAU; }
    else if ( evtStore()->contains<xAOD::JetContainer>(m_inCollKey.value()) ){ m_contType = JET; }
    else if ( evtStore()->contains<xAOD::TruthParticleContainer>(m_inCollKey.value()) ){ m_contType = TRUTHPARTICLE; }
    else if ( evtStore()->contains<xAOD::CompositeParticleContainer>(m_inCollKey.value()) ){ m_contType = COMPOSITEPARTICLE; }
    else if ( evtStore()->contains<xAOD::PFOContainer>(m_inCollKey.value()) ){ m_contType = PARITCLEFLOW; }
    else if ( evtStore()->contains<xAOD::NeutralParticleContainer>(m_inCollKey.value()) ){ m_contType = NEUTRALPARTICLE; }
    else if ( evtStore()->contains<xAOD::TrackParticleContainer>(m_inCollKey.value()) ){ m_contType = TRACKPARTICLE; }
    else if ( evtStore()->contains<xAOD::ParticleContainer>(m_inCollKey.value()) ){ m_contType = PARTICLE; }
    else if ( evtStore()->contains<xAOD::CaloClusterContainer>(m_inCollKey.value()) ){ m_contType = CALOCLUSTER; }
  }
  if ( m_contType == UNKNOWN ){
    ATH_MSG_FATAL("We couldn't determine the type of the container... abort!");
    return StatusCode::FAILURE;
  }
 
  // Get the input container and create the output containers
  const xAOD::IParticleContainer* inContainer = nullptr;
  ATH_CHECK( evtStore()->retrieve( inContainer, m_inCollKey.value() ) );
  ATH_MSG_DEBUG ( "Input collection = " << m_inCollKey.value()
                  << " retrieved from StoreGate which has " << inContainer->size() << " entries." );
 
  // --------------------------------------------------------------------------
  // Do the expression parsing once per event already here
  // --------------------------------------------------------------------------
  std::vector<int> resultVec;
  resultVec.reserve(inContainer->size());
  if ( !(m_selection.value().empty()) ){
    resultVec = m_parser->evaluateAsVector();
    // Check that the lengths of the input container and the result vector are the same
    if ( inContainer->size() != resultVec.size() ) {
      ATH_MSG_ERROR("We got an input container, but its size (" << inContainer->size()
                    << ") doesn't match the size of the result vector: " << resultVec.size() );
      return StatusCode::FAILURE;
    }
    ATH_MSG_VERBOSE("Have a container of size " << inContainer->size()
                    << " and a result vector of size " << resultVec.size() );
  } // End: If expression parsing was requested in the first place
 
 
  // --------------------------------------------------------------------------
  // Do the heavy lifting of actually creating the new and reduced output container(s)
  // --------------------------------------------------------------------------
  if ( m_contType == PHOTON ){
    ATH_CHECK( (this->selectParticles<xAOD::PhotonContainer,xAOD::PhotonAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == ELECTRON ){
    ATH_CHECK( (this->selectParticles<xAOD::ElectronContainer,xAOD::ElectronAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == MUON ){
    ATH_CHECK( (this->selectParticles<xAOD::MuonContainer,xAOD::MuonAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == TAU ){
    ATH_CHECK( (this->selectParticles<xAOD::TauJetContainer,xAOD::TauJetAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == JET ){
    ATH_CHECK( (this->selectParticles<xAOD::JetContainer,xAOD::JetAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == TRUTHPARTICLE ){
    ATH_CHECK( (this->selectParticles<xAOD::TruthParticleContainer,xAOD::TruthParticleAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == COMPOSITEPARTICLE ){
    ATH_CHECK( (this->selectParticles<xAOD::CompositeParticleContainer,xAOD::CompositeParticleAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == PARITCLEFLOW ){
    ATH_CHECK( (this->selectParticles<xAOD::PFOContainer,xAOD::PFOAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == NEUTRALPARTICLE ){
    ATH_CHECK( (this->selectParticles<xAOD::NeutralParticleContainer,xAOD::NeutralParticleAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == TRACKPARTICLE ){
    ATH_CHECK( (this->selectParticles<xAOD::TrackParticleContainer,xAOD::TrackParticleAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == PARTICLE ){
    ATH_CHECK( (this->selectParticles<xAOD::ParticleContainer,xAOD::ParticleAuxContainer>(inContainer,resultVec)) );
  }
  else if ( m_contType == CALOCLUSTER ){
    ATH_CHECK( (this->selectParticles<xAOD::CaloClusterContainer,xAOD::CaloClusterAuxContainer>(inContainer,resultVec)) );
  }
 
  return StatusCode::SUCCESS;
}