HepMcParticleLinkCnv_p3.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// Framework includes
#include "GaudiKernel/MsgStream.h"
#include "AthenaKernel/proxyDictFromEventContext.h"
 
#include "GeneratorObjectsTPCnv/HepMcParticleLinkCnv_p3.h"
 
 
void HepMcParticleLinkCnv_p3::persToTrans( const HepMcParticleLink_p3* persObj,
                                           HepMcParticleLink* transObj,
                                           MsgStream &/*msg*/ ) const
{
  HepMcParticleLink::PositionFlag flag = HepMcParticleLink::IS_EVENTNUM;
 
  if (persObj->m_mcEvtIndex == 0) {
    flag = HepMcParticleLink::IS_POSITION;
  }
 
  transObj->setExtendedBarCode
    ( HepMcParticleLink::ExtendedBarCode( persObj->m_id,
                                          persObj->m_mcEvtIndex,
                                          flag) );
 
  transObj->setTruthSuppressionType(HepMcParticleLink::ExtendedBarCode::truthSuppressionTypeFromChar (persObj->m_truthSupp));
}
 
void HepMcParticleLinkCnv_p3::transToPers( const HepMcParticleLink* transObj,
                                           HepMcParticleLink_p3* persObj,
                                           MsgStream &msg ) const
{
  // In the case that the standard production workflow is being used
  // then the first event in the McEventCollection is the only one
  // where the eventIndex could exceed the maximum value of unsigned
  // short. In this case we can work around the issue by using an
  // m_mcEvtIndex of zero as a special case, in which m_mcEvtIndex
  // should be interpreted as the position in the McEventCollection
  // rather than the value of GenEvent::event_number().
  IProxyDict* proxy = Atlas::proxyDictFromEventContext();
  unsigned short index{0};
  const HepMcParticleLink::index_type position =
    HepMcParticleLink::getEventPositionInCollection(transObj->eventIndex(),
                                                    proxy).at(0);
  if (position!=0) {
    index = transObj->eventIndex();
    if(transObj->eventIndex()!=static_cast<HepMcParticleLink::index_type>(index)) {
      msg << MSG::WARNING << "Attempting to persistify an eventIndex larger than max unsigned short!" << endmsg;
    }
  }
  persObj->m_mcEvtIndex = index;
  persObj->m_id = transObj->id();
  persObj->m_truthSupp = transObj->getTruthSuppressionTypeAsChar();
}