ROOT::Experimental::Internal::RNTupleColumnReader Class Reference

Every RDF column is represented by exactly one RNTuple field.

Definition at line 156 of file RNTupleDS.cxx.

Public Member Functions
	RNTupleColumnReader (RNTupleDS *ds, RFieldBase *protoField)
	~RNTupleColumnReader ()=default
void	Connect (RPageSource &source, Long64_t entryOffset)
	Connect the field and its subfields to the page source.
void	Disconnect (bool keepValue)
void *	GetImpl (Long64_t entry) final
Public Member Functions inherited from ROOT::Detail::RDF::RColumnReaderBase
virtual	~RColumnReaderBase ()=default
template<typename T >
T &	Get (Long64_t entry)
	Return the column value for the given entry.

Private Types
using	RFieldBase = ROOT::Experimental::RFieldBase
using	RPageSource = ROOT::Experimental::Internal::RPageSource

Private Attributes
RNTupleDS *	fDataSource
	The data source that owns this column reader.
Long64_t	fEntryOffset = 0
	For chains, the logical entry and the physical entry in any particular file can be different.
std::unique_ptr< RFieldBase >	fField
	The field backing the RDF column.
Long64_t	fLastEntry = -1
	Last entry number that was read.
RFieldBase *	fProtoField
	The prototype field from which fField is cloned.
std::unique_ptr< RFieldBase::RValue >	fValue
	The memory location used to read from fField.
std::shared_ptr< void >	fValuePtr
	Used to reuse the object created by fValue when reconnecting sources.

Inheritance diagram for ROOT::Experimental::Internal::RNTupleColumnReader:

Member Typedef Documentation

RFieldBase

using ROOT::Experimental::Internal::RNTupleColumnReader::RFieldBase = ROOT::Experimental::RFieldBase

private

Definition at line 157 of file RNTupleDS.cxx.

RPageSource

using ROOT::Experimental::Internal::RNTupleColumnReader::RPageSource = ROOT::Experimental::Internal::RPageSource

private

Definition at line 158 of file RNTupleDS.cxx.

Constructor & Destructor Documentation

RNTupleColumnReader()

ROOT::Experimental::Internal::RNTupleColumnReader::RNTupleColumnReader ( RNTupleDS *  ds, RFieldBase *  protoField  )

inline

Definition at line 172 of file RNTupleDS.cxx.

~RNTupleColumnReader()

ROOT::Experimental::Internal::RNTupleColumnReader::~RNTupleColumnReader ( )

default

Member Function Documentation

Connect()

void ROOT::Experimental::Internal::RNTupleColumnReader::Connect ( RPageSource &  source, Long64_t  entryOffset  )

inline

Connect the field and its subfields to the page source.

Definition at line 176 of file RNTupleDS.cxx.

Disconnect()

void ROOT::Experimental::Internal::RNTupleColumnReader::Disconnect ( bool  keepValue )

inline

Definition at line 207 of file RNTupleDS.cxx.

GetImpl()

void * ROOT::Experimental::Internal::RNTupleColumnReader::GetImpl ( Long64_t  entry )

inlinefinalvirtual

Implements ROOT::Detail::RDF::RColumnReaderBase.

Definition at line 217 of file RNTupleDS.cxx.

Member Data Documentation

fDataSource

RNTupleDS* ROOT::Experimental::Internal::RNTupleColumnReader::fDataSource

private

The data source that owns this column reader.

Definition at line 160 of file RNTupleDS.cxx.

fEntryOffset

Long64_t ROOT::Experimental::Internal::RNTupleColumnReader::fEntryOffset = 0

private

For chains, the logical entry and the physical entry in any particular file can be different.

The entry offset stores the logical entry number (sum of all previous physical entries) when a file of the corresponding data source was opened.

Definition at line 169 of file RNTupleDS.cxx.

fField

std::unique_ptr<RFieldBase> ROOT::Experimental::Internal::RNTupleColumnReader::fField

private

The field backing the RDF column.

Definition at line 162 of file RNTupleDS.cxx.

fLastEntry

Long64_t ROOT::Experimental::Internal::RNTupleColumnReader::fLastEntry = -1

private

Last entry number that was read.

Definition at line 165 of file RNTupleDS.cxx.

fProtoField

RFieldBase* ROOT::Experimental::Internal::RNTupleColumnReader::fProtoField

private

The prototype field from which fField is cloned.

Definition at line 161 of file RNTupleDS.cxx.

fValue

std::unique_ptr<RFieldBase::RValue> ROOT::Experimental::Internal::RNTupleColumnReader::fValue

private

The memory location used to read from fField.

Definition at line 163 of file RNTupleDS.cxx.

fValuePtr

std::shared_ptr<void> ROOT::Experimental::Internal::RNTupleColumnReader::fValuePtr

private

Used to reuse the object created by fValue when reconnecting sources.

Definition at line 164 of file RNTupleDS.cxx.