RTreeColumnReader.hxx

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// Author: Enrico Guiraud CERN 09/2020
// Author: Vincenzo Eduardo Padulano CERN 09/2024
 
/*************************************************************************
 * Copyright (C) 1995-2024, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_RDF_RTREECOLUMNREADER
#define ROOT_RDF_RTREECOLUMNREADER
 
#include "RColumnReaderBase.hxx"
#include <ROOT/RVec.hxx>
#include "ROOT/RDF/Utils.hxx"
#include <Rtypes.h> // Long64_t, R__CLING_PTRCHECK
 
#include <array>
#include <memory>
#include <string>
#include <cstddef>
 
class TTreeReader;
 
namespace ROOT {
namespace Internal {
 
class TTreeReaderOpaqueValue;
class TTreeReaderUntypedArray;
class TTreeReaderUntypedValue;
 
namespace RDF {
 
class R__CLING_PTRCHECK(off) RTreeOpaqueColumnReader final : public ROOT::Detail::RDF::RColumnReaderBase {
   std::unique_ptr<ROOT::Internal::TTreeReaderOpaqueValue> fTreeValue;
 
   void *GetImpl(Long64_t);
 
public:
   /// Construct the RTreeColumnReader. Actual initialization is performed lazily by the Init method.
   RTreeOpaqueColumnReader(TTreeReader &r, std::string_view colName);
 
   // Rule of five
 
   RTreeOpaqueColumnReader(const RTreeOpaqueColumnReader &) = delete;
   RTreeOpaqueColumnReader &operator=(const RTreeOpaqueColumnReader &) = delete;
   RTreeOpaqueColumnReader(RTreeOpaqueColumnReader &&) = delete;
   RTreeOpaqueColumnReader &operator=(RTreeOpaqueColumnReader &&) = delete;
   ~RTreeOpaqueColumnReader() final; // Define destructor when data member type is fully defined
};
 
/// RTreeColumnReader specialization for TTree values read via TTreeReaderUntypedValue
class R__CLING_PTRCHECK(off) RTreeUntypedValueColumnReader final : public ROOT::Detail::RDF::RColumnReaderBase {
   std::unique_ptr<ROOT::Internal::TTreeReaderUntypedValue> fTreeValue;
 
   void *GetImpl(Long64_t);
 
public:
   RTreeUntypedValueColumnReader(TTreeReader &r, std::string_view colName, std::string_view typeName);
 
   // Rule of five
 
   RTreeUntypedValueColumnReader(const RTreeUntypedValueColumnReader &) = delete;
   RTreeUntypedValueColumnReader &operator=(const RTreeUntypedValueColumnReader &) = delete;
   RTreeUntypedValueColumnReader(RTreeUntypedValueColumnReader &&) = delete;
   RTreeUntypedValueColumnReader &operator=(RTreeUntypedValueColumnReader &&) = delete;
   ~RTreeUntypedValueColumnReader() final; // Define destructor when data member type is fully defined
};
 
/// RTreeColumnReader specialization for TTree values read via TTreeReaderUntypedValue
class R__CLING_PTRCHECK(off) RTreeUntypedArrayColumnReader final : public ROOT::Detail::RDF::RColumnReaderBase {
public:
   enum class ECollectionType {
      kRVec,
      kStdArray,
      kRVecBool
   };
 
   RTreeUntypedArrayColumnReader(TTreeReader &r, std::string_view colName, std::string_view valueTypeName,
                                 ECollectionType collType);
 
   // Rule of five
 
   RTreeUntypedArrayColumnReader(const RTreeUntypedArrayColumnReader &) = delete;
   RTreeUntypedArrayColumnReader &operator=(const RTreeUntypedArrayColumnReader &) = delete;
   RTreeUntypedArrayColumnReader(RTreeUntypedArrayColumnReader &&) = delete;
   RTreeUntypedArrayColumnReader &operator=(RTreeUntypedArrayColumnReader &&) = delete;
   ~RTreeUntypedArrayColumnReader() final; // Define destructor when data member type is fully defined
 
private:
   std::unique_ptr<ROOT::Internal::TTreeReaderUntypedArray> fTreeArray;
   ECollectionType fCollectionType;
 
   using Byte_t = std::byte;
   /// We return a reference to this RVec to clients, to guarantee a stable address and contiguous memory layout.
   RVec<Byte_t> fRVec{};
 
   Long64_t fLastEntry = -1;
 
   /// The size of the collection value type.
   std::size_t fValueSize{};
 
   /// Whether we already printed a warning about performing a copy of the TTreeReaderArray contents
   bool fCopyWarningPrinted = false;
 
   void *GetImpl(Long64_t entry);
};
 
} // namespace RDF
} // namespace Internal
} // namespace ROOT
 
#endif