xAODTEventBranch.cxx

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//
// Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
//
 
// Local include(s):
#include "xAODRootAccess/tools/xAODTEventBranch.h"
#include "xAODRootAccess/tools/Message.h"
#include "xAODRootAccess/TEvent.h"
 
ClassImp( xAODTEventBranch )
 
xAODTEventBranch::xAODTEventBranch( ::TTree& parent, xAOD::TEvent& event,
                                    const std::type_info& ti,
                                    const char* brName, const char* brType )
   : ::TBranchObject(),
     m_event( &event ), m_ti( &ti ), m_object( nullptr ) {
 
   // Now that the object is established in memory, let's initialise it:
   Init( &parent, 0, brName, brType, &m_object, 32000, 0, -1, kTRUE );
}
 
::Int_t xAODTEventBranch::GetEntry( ::Long64_t entry, ::Int_t /*getall*/ ) {
 
   // Check if the branch is active:
   if( TestBit( kDoNotProcess ) ) {
      return 0;
   }
 
   // Check whether we already have the requested entry:
   if( fReadEntry == entry ) {
      return 1;
   }
 
   // Load the requested entry:
   if( m_event->getEntry( entry ) < 0 ) {
      Error( "GetEntry",
             XAOD_MESSAGE( "Problems with loading entry %lld" ), entry );
      return -1;
   }
 
   // Update the internal pointer:
   m_object = m_event->getInputObject( GetName(), *m_ti );
   if( ! m_object ) {
      Error( "GetEntry",
             XAOD_MESSAGE( "Failed to read variable of type \"%s\" with "
                           "key \"%s\"" ),
             GetClassName(), GetName() );
      return -1;
   }
 
   // We were successful:
   fReadEntry = entry;
   return 1;
}
 
::TClass* xAODTEventBranch::IsA() const {
 
   return ::TBranchObject::IsA();
}