This class is the textual representation of the content of a columnar dataset.

This class is provided to the user, and it can be used to print on screen the entries of the dataset requested through the Display action in a compact representation or to return the full representation of the events as a string. In order to apply proper formatting the content is buffered in memory as strings.

Definition at line 64 of file RDisplay.hxx.

Public Member Functions
	RDisplay (const VecStr_t &columnNames, const VecStr_t &types, size_t nMaxCollectionElements)
	Creates an RDisplay to print the event values.

std::string	AsString () const
	Returns the representation as a string.

void	Print () const
	Prints the representation to the standard output.

Private Types
using	DElement_t = ROOT::Internal::RDF::RDisplayElement

using	VecStr_t = std::vector< std::string >

Private Member Functions
void	AddCollectionToRow (const VecStr_t &collection)
	Adds a collection to the table.

bool	AddInterpreterString (std::stringstream &, ROOT::RVec< bool > &boolArr, const int &index)
	AddInterpreterString overload for arrays of booleans.

bool	AddInterpreterString (std::stringstream &, ROOT::RVec< char > &charArr, const int &index)
	AddInterpreterString overload for arrays of chars.

template<typename T , std::enable_if_t< ROOT::Internal::RDF::IsDataContainer< T >::value, int > = 0>
bool	AddInterpreterString (std::stringstream &stream, T &collection, const int &index)
	Appends collection.size() cling::printValue calls to the stringstream.

template<typename T , std::enable_if_t<!ROOT::Internal::RDF::IsDataContainer< T >::value, int > = 0>
bool	AddInterpreterString (std::stringstream &stream, T &element, const int &index)
	Appends a cling::printValue call to the stringstream.

template<typename... Columns>
void	AddRow (Columns &... columns)
	Adds a row of events to the table.

void	AddToRow (const std::string &stringEle)
	Adds a single element to the next slot in the table.

std::string	DashesBetweenLines (size_t lastColToPrint, bool allColumnsFit) const
	Generate dashes between entries in Print() and AsString() Methods.

void	EnsureCurrentColumnWidth (size_t w)

size_t	GetNColumnsToShorten () const
	Get the number of columns that do NOT fit in the characters limit.

void	MovePosition ()
	Moves to the next cell.

Private Attributes
std::vector< VecStr_t >	fCollectionsRepresentations
	Used by the JITted code to store the string representation of the data in case of collection.

size_t	fCurrentColumn = 0
	Column that is being filled.

size_t	fCurrentRow = 0
	Row that is being filled.

std::vector< bool >	fIsCollection
	True if the column contains a collection.

size_t	fNColumns
	Number of columns to be printed.

size_t	fNextRow = 1
	Next row to be filled.

size_t	fNMaxCollectionElements = 10

VecStr_t	fRepresentations
	Used by the JITted code to store the string representation of the data.

std::vector< std::vector< DElement_t > >	fTable
	String representation of the data to be printed.

VecStr_t	fTypes
	This attribute stores the type of each column. It is needed by the interpreter to print it.

std::vector< unsigned short >	fWidths
	Tracks the maximum width of each column, based on the largest element.

Static Private Attributes
static constexpr unsigned	fgMaxWidth = 100
	Maximum width of the table that Print() displays.

static constexpr char	fgSeparator = ' '
	Spacing used to align the table entries.

Friends
template<typename T >
class	ROOT::Internal::RDF::DisplayHelper

#include <ROOT/RDF/RDisplay.hxx>

Member Typedef Documentation

◆ DElement_t

using ROOT::RDF::RDisplay::DElement_t = ROOT::Internal::RDF::RDisplayElement

private

Definition at line 69 of file RDisplay.hxx.

◆ VecStr_t

using ROOT::RDF::RDisplay::VecStr_t = std::vector<std::string>

private

Definition at line 68 of file RDisplay.hxx.

Constructor & Destructor Documentation

◆ RDisplay()

ROOT::RDF::RDisplay::RDisplay	(	const VecStr_t &	columnNames,
		const VecStr_t &	types,
		size_t	nMaxCollectionElements
	)

Creates an RDisplay to print the event values.

Parameters

[in]	columnNames	Columns to print
[in]	types	The type of each column
[in]	nMaxCollectionElements	Number of maximum elements in collection.

Definition at line 178 of file RDFDisplay.cxx.

Member Function Documentation

◆ AddCollectionToRow()

void ROOT::RDF::RDisplay::AddCollectionToRow ( const VecStr_t & collection )

private

Adds a collection to the table.

Starting from the slot, the elements are added one under the other, each one using a single cell of an entire row

Definition at line 128 of file RDFDisplay.cxx.

◆ AddInterpreterString() [1/4]

bool ROOT::RDF::RDisplay::AddInterpreterString	(	std::stringstream &	,
		ROOT::RVec< bool > &	boolArr,
		const int &	index
	)

inlineprivate

AddInterpreterString overload for arrays of booleans.

Parameters

[in]	boolArr	The bool array to convert to string representation
[in]	index	To which column the event belongs

Returns: true, the event is a collection

This specialization for arrays of booleans skips the cling::printValue (i.e. appends nothing to the stream) and directly writes to fCollectionsRepresentations the string representation of the array of chars.

Definition at line 166 of file RDisplay.hxx.

◆ AddInterpreterString() [2/4]

bool ROOT::RDF::RDisplay::AddInterpreterString	(	std::stringstream &	,
		ROOT::RVec< char > &	charArr,
		const int &	index
	)

inlineprivate

AddInterpreterString overload for arrays of chars.

Parameters

[in]	charArr	The character array to convert to string representation
[in]	index	To which column the event belongs

Returns: false, the event is not a collection

This specialization for arrays of characters skips the cling::printValue (i.e. appends nothing to the stream) and directly writes to fRepresentations the string representation of the array of chars.

Definition at line 147 of file RDisplay.hxx.

◆ AddInterpreterString() [3/4]

template<typename T , std::enable_if_t< ROOT::Internal::RDF::IsDataContainer< T >::value, int > = 0>

bool ROOT::RDF::RDisplay::AddInterpreterString	(	std::stringstream &	stream,
		T &	collection,
		const int &	index
	)

inlineprivate

Appends collection.size() cling::printValue calls to the stringstream.

Template Parameters

T	the type of the event to convert

Parameters

[in]	stream	Where the conversion function call will be chained.
[in]	collection	The event to convert to its string representation
[in]	index	To which column the event belongs to

Returns: true, the event is a collection This function chains a sequence of call to cling::printValue, one for each element of the collection.

Definition at line 116 of file RDisplay.hxx.

◆ AddInterpreterString() [4/4]

template<typename T , std::enable_if_t<!ROOT::Internal::RDF::IsDataContainer< T >::value, int > = 0>

bool ROOT::RDF::RDisplay::AddInterpreterString	(	std::stringstream &	stream,
		T &	element,
		const int &	index
	)

inlineprivate

Appends a cling::printValue call to the stringstream.

Template Parameters

T	the type of the event to convert

Parameters

[in]	stream	Where the conversion function call will be chained.
[in]	element	The event to convert to its string representation
[in]	index	To which column the event belongs to

Returns: false, the event is not a collection

Definition at line 100 of file RDisplay.hxx.

◆ AddRow()

template<typename... Columns>

void ROOT::RDF::RDisplay::AddRow ( Columns &... columns )

inlineprivate

Adds a row of events to the table.

Definition at line 206 of file RDisplay.hxx.

◆ AddToRow()

void ROOT::RDF::RDisplay::AddToRow ( const std::string & stringEle )

private

Adds a single element to the next slot in the table.

Definition at line 116 of file RDFDisplay.cxx.

◆ AsString()

std::string ROOT::RDF::RDisplay::AsString ( ) const

Returns the representation as a string.

Definition at line 285 of file RDFDisplay.cxx.

◆ DashesBetweenLines()

std::string ROOT::RDF::RDisplay::DashesBetweenLines	(	size_t	lastColToPrint,
		bool	allColumnsFit
	)		const

private

Generate dashes between entries in Print() and AsString() Methods.

Definition at line 207 of file RDFDisplay.cxx.

◆ EnsureCurrentColumnWidth()

void ROOT::RDF::RDisplay::EnsureCurrentColumnWidth ( size_t w )

private

Definition at line 105 of file RDFDisplay.cxx.

◆ GetNColumnsToShorten()

size_t ROOT::RDF::RDisplay::GetNColumnsToShorten ( ) const

private

Get the number of columns that do NOT fit in the characters limit.

Definition at line 191 of file RDFDisplay.cxx.

◆ MovePosition()

void ROOT::RDF::RDisplay::MovePosition ( )

private

Moves to the next cell.

Moves to the next cell, and if the row is full moves to the next row.

Definition at line 166 of file RDFDisplay.cxx.

◆ Print()

void ROOT::RDF::RDisplay::Print ( ) const

Prints the representation to the standard output.

Collections are shortened to the first and last element. The overall width is shortened to a fixed number of columns that should fit the screen width.

Definition at line 221 of file RDFDisplay.cxx.

Friends And Related Symbol Documentation

◆ ROOT::Internal::RDF::DisplayHelper

template<typename T >

friend class ROOT::Internal::RDF::DisplayHelper

friend

Definition at line 66 of file RDisplay.hxx.

Member Data Documentation

◆ fCollectionsRepresentations

std::vector<VecStr_t> ROOT::RDF::RDisplay::fCollectionsRepresentations

private

Used by the JITted code to store the string representation of the data in case of collection.

Each row corresponds to a column, each column to a value of the collection.

Definition at line 80 of file RDisplay.hxx.

◆ fCurrentColumn

size_t ROOT::RDF::RDisplay::fCurrentColumn = 0

private

Column that is being filled.

Definition at line 88 of file RDisplay.hxx.

◆ fCurrentRow

size_t ROOT::RDF::RDisplay::fCurrentRow = 0

private

Row that is being filled.

Definition at line 86 of file RDisplay.hxx.

◆ fgMaxWidth

constexpr unsigned ROOT::RDF::RDisplay::fgMaxWidth = 100

staticconstexprprivate

Maximum width of the table that Print() displays.

Definition at line 71 of file RDisplay.hxx.

◆ fgSeparator

constexpr char ROOT::RDF::RDisplay::fgSeparator = ' '

staticconstexprprivate

Spacing used to align the table entries.

Definition at line 70 of file RDisplay.hxx.

◆ fIsCollection

std::vector<bool> ROOT::RDF::RDisplay::fIsCollection

private

True if the column contains a collection.

Collections are treated differently during the printing.

Definition at line 74 of file RDisplay.hxx.

◆ fNColumns

size_t ROOT::RDF::RDisplay::fNColumns

private

Number of columns to be printed.

Definition at line 84 of file RDisplay.hxx.

◆ fNextRow

size_t ROOT::RDF::RDisplay::fNextRow = 1

private

Next row to be filled.

Definition at line 87 of file RDisplay.hxx.

◆ fNMaxCollectionElements

size_t ROOT::RDF::RDisplay::fNMaxCollectionElements = 10

private

Definition at line 90 of file RDisplay.hxx.

◆ fRepresentations

VecStr_t ROOT::RDF::RDisplay::fRepresentations

private

Used by the JITted code to store the string representation of the data.

Definition at line 79 of file RDisplay.hxx.

◆ fTable

std::vector<std::vector<DElement_t> > ROOT::RDF::RDisplay::fTable

private

String representation of the data to be printed.

Definition at line 76 of file RDisplay.hxx.

◆ fTypes

VecStr_t ROOT::RDF::RDisplay::fTypes

private

This attribute stores the type of each column. It is needed by the interpreter to print it.

Definition at line 73 of file RDisplay.hxx.

◆ fWidths

std::vector<unsigned short> ROOT::RDF::RDisplay::fWidths

private

Tracks the maximum width of each column, based on the largest element.

Definition at line 77 of file RDisplay.hxx.

Libraries for ROOT::RDF::RDisplay:

[legend]

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

tree/dataframe/inc/ROOT/RDF/RDisplay.hxx
tree/dataframe/src/RDFDisplay.cxx

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Friends

Member Typedef Documentation

◆ DElement_t

◆ VecStr_t

Constructor & Destructor Documentation

◆ RDisplay()

Member Function Documentation

◆ AddCollectionToRow()

◆ AddInterpreterString() [1/4]

◆ AddInterpreterString() [2/4]

◆ AddInterpreterString() [3/4]

◆ AddInterpreterString() [4/4]

◆ AddRow()

◆ AddToRow()

◆ AsString()

◆ DashesBetweenLines()

◆ EnsureCurrentColumnWidth()

◆ GetNColumnsToShorten()

◆ MovePosition()

◆ Print()

Friends And Related Symbol Documentation

◆ ROOT::Internal::RDF::DisplayHelper

Member Data Documentation

◆ fCollectionsRepresentations

◆ fCurrentColumn

◆ fCurrentRow

◆ fgMaxWidth

◆ fgSeparator

◆ fIsCollection

◆ fNColumns

◆ fNextRow

◆ fNMaxCollectionElements

◆ fRepresentations

◆ fTable

◆ fTypes

◆ fWidths