RNTCollectionCursor.h

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef RNTCOLLECTIONCURSOR_H
#define RNTCOLLECTIONCURSOR_H
 
#include "PersistentDataModel/Token.h"
 
#include "CollectionBase/CollectionRowBuffer.h"
#include "CollectionBase/ICollectionDescription.h"
#include "CollectionBase/ICollectionCursor.h"
 
#include <memory>
 
#include "RVersion.h"
 
#if ROOT_VERSION_CODE >= ROOT_VERSION( 6, 35, 0 )
namespace ROOT {
   class REntry;
   class RNTupleReader;
}
#else
namespace ROOT::Experimental {
   class REntry;
   class RNTupleReader;
}
namespace ROOT {
   using REntry = ROOT::Experimental::REntry;
   using RNTupleReader = ROOT::Experimental::RNTupleReader;
}
#endif
 
namespace pool {
   namespace RootCollection {
 
      class RNTCollectionCursor : public ICollectionCursor
      {
      public:
 
         RNTCollectionCursor(
            const pool::ICollectionDescription& description,
            const pool::CollectionRowBuffer& collectionRowBuffer,
            ROOT::RNTupleReader* reader );
 
        
         virtual bool next() override;
 
         virtual const pool::CollectionRowBuffer& currentRow() const override;
 
         virtual std::size_t size() override;
 
         virtual bool seek(std::size_t position) override;
 
         virtual const Token& eventRef() const override;
 
         virtual void close() override;
 
         virtual ~RNTCollectionCursor();
 
      protected:
 
         const ICollectionDescription&  m_description;
 
         ROOT::RNTupleReader*                 m_RNTReader;
 
         std::unique_ptr< ROOT::REntry >      m_RNTEntry;
 
         pool::CollectionRowBuffer      m_collectionRowBuffer;
 
         std::vector< std::pair< Token*, std::string > >  m_tokens;
 
     std::size_t                    m_idx;
         bool                           m_dummyRef;
      };
   }
}
 
#endif