RNTupleCollectionCursor.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef RNTUPLECOLLECTIONCURSOR_H
#define RNTUPLECOLLECTIONCURSOR_H
 
#include "PersistentDataModel/Token.h"
 
#include "CollectionSvc/CollectionRowBuffer.h"
#include "CollectionSvc/CollectionDescription.h"
#include "CollectionSvc/ICollectionCursor.h"
 
#include <memory>
 
#include "RVersion.h"
 
namespace ROOT {
   class REntry;
   class RNTupleReader;
}
 
namespace pool {
   namespace RootCollection {

      class RNTupleCollectionCursor : public ICollectionCursor
      {
      public:
 
         RNTupleCollectionCursor(
            const pool::CollectionDescription& 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 ~RNTupleCollectionCursor();
 
      protected:
 
         const CollectionDescription&        m_description;
 
         ROOT::RNTupleReader*                m_RNTReader;

         std::unique_ptr< ROOT::REntry >     m_RNTEntry;

         pool::CollectionRowBuffer           m_collectionRowBuffer;

         std::string                         m_tokenStr;
 
          std::size_t                         m_idx;
      };
   }
}
 
#endif