ViewContainerThinning.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// ViewContainerThinning.cxx 
// Implementation file for class ViewContainerThinning
// Author: S.Binet<binet@cern.ch>
 
// DerivationFrameworkJetEtMiss includes
#include "ViewContainerThinning.h"
 
// STL includes
 
// FrameWork includes
#include "StoreGate/ThinningHandle.h"
#include "StoreGate/ReadHandle.h"
 
#include "xAODCaloEvent/CaloClusterContainer.h"
#include "xAODTracking/TrackParticleContainer.h"
#include "xAODTruth/TruthParticleContainer.h"
 
 
 
namespace DerivationFramework {
 
  template <class T>
  StatusCode
  ViewContainerThinning::doThinningT (const EventContext& ctx,
                                      const SG::ThinningHandleKey<T>& key,
                                      const SG::ReadHandleKey<T>& viewKey) const
  {
 
    SG::ThinningHandle<T> sourceCont (key, ctx);
    SG::ReadHandle<T>     viewCont   (viewKey, ctx);
    
    std::vector<bool> masks;
    masks.assign( sourceCont->size(), false);
    
    for( const auto* part: *viewCont){ 
      masks[ part->index() ] = true;
    }
 
    sourceCont.keep (masks);
    return StatusCode::SUCCESS;
  }
 
 
  // Athena algtool's Hooks
  StatusCode ViewContainerThinning::initialize()
  {
    ATH_MSG_INFO ("Initializing " << name() << "...");
 
    ATH_CHECK( m_trackParticleKey.initialize (m_streamName, !m_trackParticleKey.empty()) );
    ATH_CHECK( m_caloClusterKey.initialize   (m_streamName, !m_caloClusterKey.empty()) );
    ATH_CHECK( m_truthParticleKey.initialize (m_streamName, !m_truthParticleKey.empty()) );
 
    ATH_CHECK( m_trackParticleViewKey.initialize (!m_trackParticleViewKey.empty()) );
    ATH_CHECK( m_caloClusterViewKey.initialize   (!m_caloClusterViewKey.empty()) );
    ATH_CHECK( m_truthParticleViewKey.initialize (!m_truthParticleViewKey.empty()) );
 
    return StatusCode::SUCCESS;
  }
 
  StatusCode ViewContainerThinning::finalize()
  {
    return StatusCode::SUCCESS;
  }
 
 
 
  StatusCode ViewContainerThinning::doThinning(const EventContext& ctx) const
  {
 
    if (!m_trackParticleKey.empty()) {
      ATH_CHECK( doThinningT (ctx, m_trackParticleKey, m_trackParticleViewKey) );
    }
 
    if (!m_caloClusterKey.empty()) {
      ATH_CHECK( doThinningT (ctx, m_caloClusterKey, m_caloClusterViewKey) );
    }
 
    if (!m_truthParticleKey.empty()) {
      ATH_CHECK( doThinningT (ctx, m_truthParticleKey, m_truthParticleViewKey) );
    }
    return StatusCode::SUCCESS;
  }
 
}