casacore::ConcatRows Class Reference

Class holding the row numbers in a ConcatTable. More...

#include <ConcatRows.h>

Public Member Functions
	ConcatRows ()
	Construct an empty block. More...
void	reserve (uInt ntable)
	Reserve the block for the given nr of tables. More...
void	add (rownr_t nrow)
	Add a table with the given nr of rows. More...
uInt	ntable () const
	Give the nr of tables. More...
rownr_t	nrow () const
	Get the total nr of rows. More...
rownr_t	operator[] (uInt i) const
	Give the nr of rows for the i-th table. More...
rownr_t	offset (uInt i) const
	Give the offset for the i-th table. More...
void	mapRownr (uInt &tableNr, rownr_t &tabRownr, rownr_t rownr) const
	Map an overall row number to a table and row number. More...

Private Member Functions
void	findRownr (rownr_t rownr) const
	Find the row number and fill in the lastXX_p values. More...

Private Attributes
Block< rownr_t >	itsRows
uInt	itsNTable
rownr_t	itsLastStRow
rownr_t	itsLastEndRow
uInt	itsLastTableNr

Detailed Description

Class holding the row numbers in a ConcatTable.

Intended use:

Internal

Review Status

Reviewed By:

UNKNOWN

Test programs:

tConcatRows

Prerequisite

• Block

Synopsis

ConcatRows is used to hold the row numbers forming the concatenation of oher tables. table. It contains a vector which can hold the row numbers in 2 ways:

1. As a normal series of row numbers. This is used by e.g. class ConcatTable
2. As a series of Slices. In this case 3 subsequent entries in the vector are used to represent start, end, and increment. This is used by a function like ScalarColumn::getColumnRange.

Class ConcatRowsIter can be used to iterate through a ConcatRows object. Each step in the iteration goes to the next slice. If the ConcatRows object contains a simple series of row numbers, each slice contains only one row number. This can degrade performance, so it is possible to use shortcuts by testing if the object contains slices (using isSliced()) and getting the row number vector directly (using rowVector()).

Motivation

ConcatRows is meant to have one class representing the various ways of picking row numbers. This simplifies the interface of the table and data manager classes dealing with getting/putting the data.

Definition at line 83 of file ConcatRows.h.

Constructor & Destructor Documentation

casacore::ConcatRows::ConcatRows ( )

inline

Construct an empty block.

Definition at line 87 of file ConcatRows.h.

Member Function Documentation

void casacore::ConcatRows::add

(

rownr_t

nrow

)

Add a table with the given nr of rows.

void casacore::ConcatRows::findRownr ( rownr_t  rownr ) const

private

Find the row number and fill in the lastXX_p values.

Referenced by mapRownr().

void casacore::ConcatRows::mapRownr ( uInt &  tableNr, rownr_t &  tabRownr, rownr_t  rownr  ) const

inline

Map an overall row number to a table and row number.

Definition at line 118 of file ConcatRows.h.

References findRownr(), itsLastEndRow, itsLastStRow, and itsLastTableNr.

rownr_t casacore::ConcatRows::nrow ( ) const

inline

Get the total nr of rows.

Definition at line 106 of file ConcatRows.h.

References itsNTable, and itsRows.

uInt casacore::ConcatRows::ntable ( ) const

inline

Give the nr of tables.

Definition at line 102 of file ConcatRows.h.

References itsNTable.

rownr_t casacore::ConcatRows::offset ( uInt  i ) const

inline

Give the offset for the i-th table.

Definition at line 114 of file ConcatRows.h.

References itsRows.

rownr_t casacore::ConcatRows::operator[] ( uInt  i ) const

inline

Give the nr of rows for the i-th table.

Definition at line 110 of file ConcatRows.h.

References itsRows.

void casacore::ConcatRows::reserve ( uInt  ntable )

inline

Reserve the block for the given nr of tables.

Definition at line 95 of file ConcatRows.h.

References itsRows, and casacore::Block< T >::resize().

Member Data Documentation

rownr_t casacore::ConcatRows::itsLastEndRow

mutableprivate

Definition at line 135 of file ConcatRows.h.

Referenced by mapRownr().

rownr_t casacore::ConcatRows::itsLastStRow

mutableprivate

Definition at line 134 of file ConcatRows.h.

Referenced by mapRownr().

uInt casacore::ConcatRows::itsLastTableNr

mutableprivate

Definition at line 136 of file ConcatRows.h.

Referenced by mapRownr().

uInt casacore::ConcatRows::itsNTable

private

Definition at line 133 of file ConcatRows.h.

Referenced by nrow(), and ntable().

Block<rownr_t> casacore::ConcatRows::itsRows

private

Definition at line 132 of file ConcatRows.h.

Referenced by nrow(), offset(), operator[](), and reserve().

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

• tables/Tables/ConcatRows.h