ROOT::Internal::RNTupleDescriptorBuilder Class Reference

A helper class for piece-wise construction of an RNTupleDescriptor.

Used by RPageStorage implementations in order to construct the RNTupleDescriptor from the various header parts.

Definition at line 1525 of file RNTupleDescriptor.hxx.

Public Member Functions
RResult< void >	AddCluster (RClusterDescriptor &&clusterDesc)
RResult< void >	AddClusterGroup (RClusterGroupDescriptor &&clusterGroup)
RResult< void >	AddColumn (RColumnDescriptor &&columnDesc)
RResult< void >	AddExtraTypeInfo (RExtraTypeInfoDescriptor &&extraTypeInfoDesc)
void	AddField (const RFieldDescriptor &fieldDesc)
RResult< void >	AddFieldLink (ROOT::DescriptorId_t fieldId, ROOT::DescriptorId_t linkId)
RResult< void >	AddFieldProjection (ROOT::DescriptorId_t sourceId, ROOT::DescriptorId_t targetId)
void	AddToOnDiskFooterSize (std::uint64_t size)
	The real footer size also include the page list envelopes.
void	BeginHeaderExtension ()
	Mark the beginning of the header extension; any fields and columns added after a call to this function are annotated as begin part of the header extension.
ROOT::Experimental::Internal::RNTupleSerializer::StreamerInfoMap_t	BuildStreamerInfos () const
	Get the streamer info records for custom classes. Currently requires the corresponding dictionaries to be loaded.
RResult< void >	EnsureValidDescriptor () const
	Checks whether invariants hold:
const RNTupleDescriptor &	GetDescriptor () const
RNTupleDescriptor	MoveDescriptor ()
void	ReplaceExtraTypeInfo (RExtraTypeInfoDescriptor &&extraTypeInfoDesc)
void	Reset ()
	Clears so-far stored clusters, fields, and columns and return to a pristine RNTupleDescriptor.
void	SetFeature (unsigned int flag)
void	SetNTuple (const std::string_view name, const std::string_view description)
void	SetOnDiskHeaderSize (std::uint64_t size)
void	SetOnDiskHeaderXxHash3 (std::uint64_t xxhash3)
void	SetSchemaFromExisting (const RNTupleDescriptor &descriptor)
	Copies the "schema" part of descriptor into the builder's descriptor.
void	ShiftAliasColumns (std::uint32_t offset)
	Shift column IDs of alias columns by offset

Private Member Functions
RResult< void >	EnsureFieldExists (ROOT::DescriptorId_t fieldId) const

Private Attributes
RNTupleDescriptor	fDescriptor

#include <ROOT/RNTupleDescriptor.hxx>

Member Function Documentation

AddCluster()

ROOT::RResult< void > ROOT::Internal::RNTupleDescriptorBuilder::AddCluster

(

RClusterDescriptor &&

clusterDesc

)

Definition at line 1246 of file RNTupleDescriptor.cxx.

AddClusterGroup()

ROOT::RResult< void > ROOT::Internal::RNTupleDescriptorBuilder::AddClusterGroup

(

RClusterGroupDescriptor &&

clusterGroup

)

Definition at line 1190 of file RNTupleDescriptor.cxx.

AddColumn()

ROOT::RResult< void > ROOT::Internal::RNTupleDescriptorBuilder::AddColumn

(

RColumnDescriptor &&

columnDesc

)

Definition at line 1136 of file RNTupleDescriptor.cxx.

AddExtraTypeInfo()

ROOT::RResult< void > ROOT::Internal::RNTupleDescriptorBuilder::AddExtraTypeInfo

(

RExtraTypeInfoDescriptor &&

extraTypeInfoDesc

)

Definition at line 1256 of file RNTupleDescriptor.cxx.

AddField()

void ROOT::Internal::RNTupleDescriptorBuilder::AddField

(

const RFieldDescriptor &

fieldDesc

)

Definition at line 1073 of file RNTupleDescriptor.cxx.

AddFieldLink()

ROOT::RResult< void > ROOT::Internal::RNTupleDescriptorBuilder::AddFieldLink	(	ROOT::DescriptorId_t	fieldId,
		ROOT::DescriptorId_t	linkId )

Definition at line 1084 of file RNTupleDescriptor.cxx.

AddFieldProjection()

ROOT::RResult< void > ROOT::Internal::RNTupleDescriptorBuilder::AddFieldProjection	(	ROOT::DescriptorId_t	sourceId,
		ROOT::DescriptorId_t	targetId )

Definition at line 1108 of file RNTupleDescriptor.cxx.

AddToOnDiskFooterSize()

void ROOT::Internal::RNTupleDescriptorBuilder::AddToOnDiskFooterSize ( std::uint64_t size )

inline

The real footer size also include the page list envelopes.

Definition at line 1549 of file RNTupleDescriptor.hxx.

BeginHeaderExtension()

void ROOT::Internal::RNTupleDescriptorBuilder::BeginHeaderExtension

(

)

Mark the beginning of the header extension; any fields and columns added after a call to this function are annotated as begin part of the header extension.

Definition at line 1217 of file RNTupleDescriptor.cxx.

BuildStreamerInfos()

RNTupleSerializer::StreamerInfoMap_t ROOT::Internal::RNTupleDescriptorBuilder::BuildStreamerInfos

(

)

const

Get the streamer info records for custom classes. Currently requires the corresponding dictionaries to be loaded.

Definition at line 1277 of file RNTupleDescriptor.cxx.

EnsureFieldExists()

ROOT::RResult< void > ROOT::Internal::RNTupleDescriptorBuilder::EnsureFieldExists ( ROOT::DescriptorId_t fieldId ) const

private

Definition at line 932 of file RNTupleDescriptor.cxx.

EnsureValidDescriptor()

ROOT::RResult< void > ROOT::Internal::RNTupleDescriptorBuilder::EnsureValidDescriptor

(

)

const

Checks whether invariants hold:

• RNTuple name is valid
• Fields have valid parents
• Number of columns is constant across column representations

Definition at line 939 of file RNTupleDescriptor.cxx.

GetDescriptor()

const RNTupleDescriptor & ROOT::Internal::RNTupleDescriptorBuilder::GetDescriptor ( ) const

inline

Definition at line 1536 of file RNTupleDescriptor.hxx.

MoveDescriptor()

ROOT::RNTupleDescriptor ROOT::Internal::RNTupleDescriptorBuilder::MoveDescriptor

(

)

Definition at line 974 of file RNTupleDescriptor.cxx.

ReplaceExtraTypeInfo()

void ROOT::Internal::RNTupleDescriptorBuilder::ReplaceExtraTypeInfo

(

RExtraTypeInfoDescriptor &&

extraTypeInfoDesc

)

Definition at line 1267 of file RNTupleDescriptor.cxx.

Reset()

void ROOT::Internal::RNTupleDescriptorBuilder::Reset

(

)

Clears so-far stored clusters, fields, and columns and return to a pristine RNTupleDescriptor.

Definition at line 1201 of file RNTupleDescriptor.cxx.

SetFeature()

void ROOT::Internal::RNTupleDescriptorBuilder::SetFeature

(

unsigned int

flag

)

Definition at line 997 of file RNTupleDescriptor.cxx.

SetNTuple()

void ROOT::Internal::RNTupleDescriptorBuilder::SetNTuple	(	const std::string_view	name,
		const std::string_view	description )

Definition at line 990 of file RNTupleDescriptor.cxx.

SetOnDiskHeaderSize()

void ROOT::Internal::RNTupleDescriptorBuilder::SetOnDiskHeaderSize ( std::uint64_t size )

inline

Definition at line 1547 of file RNTupleDescriptor.hxx.

SetOnDiskHeaderXxHash3()

void ROOT::Internal::RNTupleDescriptorBuilder::SetOnDiskHeaderXxHash3 ( std::uint64_t xxhash3 )

inline

Definition at line 1546 of file RNTupleDescriptor.hxx.

SetSchemaFromExisting()

void ROOT::Internal::RNTupleDescriptorBuilder::SetSchemaFromExisting

(

const RNTupleDescriptor &

descriptor

)

Copies the "schema" part of descriptor into the builder's descriptor.

This resets the builder's descriptor.

Definition at line 1212 of file RNTupleDescriptor.cxx.

ShiftAliasColumns()

void ROOT::Internal::RNTupleDescriptorBuilder::ShiftAliasColumns

(

std::uint32_t

offset

)

Shift column IDs of alias columns by offset

If the descriptor is constructed in pieces consisting of physical and alias columns (regular and projected fields), the natural column order would be

• Physical and alias columns of piece one
• Physical and alias columns of piece two
• etc. What we want, however, are first all physical column IDs and then all alias column IDs. This method adds offset to the logical column IDs of all alias columns and fixes up the corresponding column IDs in the projected field descriptors. In this way, a new piece of physical and alias columns can first shift the existing alias columns by the number of new physical columns, resulting in the following order
• Physical columns of piece one
• Physical columns of piece two
• ...

Logical columns of piece two

• ...

Definition at line 1223 of file RNTupleDescriptor.cxx.

Member Data Documentation

fDescriptor

RNTupleDescriptor ROOT::Internal::RNTupleDescriptorBuilder::fDescriptor

private

Definition at line 1527 of file RNTupleDescriptor.hxx.

Libraries for ROOT::Internal::RNTupleDescriptorBuilder:

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The documentation for this class was generated from the following files:

• tree/ntuple/v7/inc/ROOT/RNTupleDescriptor.hxx
• tree/ntuple/v7/src/RNTupleDescriptor.cxx