A class to provide easy access to MSDataDescription columns. More...

#include <MSDataDescColumns.h>

Public Member Functions
	MSDataDescColumns (const MSDataDescription &msDataDesc)
	Create a columns object that accesses the data in the specified Table. More...

	~MSDataDescColumns ()
	The destructor does nothing special. More...

ScalarColumn< Bool > &	flagRow ()
	Access to required columns. More...

ScalarColumn< Int > &	polarizationId ()

ScalarColumn< Int > &	spectralWindowId ()

const ScalarColumn< Bool > &	flagRow () const
	Const access to required columns. More...

const ScalarColumn< Int > &	polarizationId () const

const ScalarColumn< Int > &	spectralWindowId () const

ScalarColumn< Int > &	lagId ()
	Access to optional columns. More...

const ScalarColumn< Int > &	lagId () const
	Const access to optional columns. More...

rownr_t	nrow () const
	Convenience function that returns the number of rows in any of the columns. More...

Int64	match (uInt spwId, uInt polId, Int64 tryRow=-1)
	returns the last row that contains the specified entries in the SPECTRAL_WINDOW_ID & POLARIZATION_ID columns. More...

Protected Member Functions
	MSDataDescColumns ()

void	attach (const MSDataDescription &msDataDesc)

Private Member Functions
	MSDataDescColumns (const MSDataDescColumns &)

MSDataDescColumns &	operator= (const MSDataDescColumns &)

void	attachOptionalCols (const MSDataDescription &msDataDesc)

Private Attributes
ScalarColumn< Bool >	flagRow_p

ScalarColumn< Int >	polarizationId_p

ScalarColumn< Int >	spectralWindowId_p

ScalarColumn< Int >	lagId_p

Detailed Description

A class to provide easy access to MSDataDescription columns.

Intended use:

Public interface

Review Status

Reviewed By:: Bob Garwood
Date Reviewed:: 1997/02/01

Prerequisite

MSDataDesc
ScalarColumn

Etymology

MSDataDescColumns stands for MeasurementSet DataDescription Table columns.

Synopsis

This class provides access to the columns in the MSDataDesc Table, it does the declaration of all the Scalar and ArrayColumns with the correct types, so the application programmer doesn't have to worry about getting those right. There is an access function for every predefined column. Access to non-predefined columns will still have to be done with explicit declarations. See MSColumns for an example.
Warning: The Table that is used to construct this class must not be destroyed (or go out of scope) before this class does; Otherwise the scalar and array columns use by this class will be left dangling;

Motivation

See MSColumns for the motivation.

Definition at line 74 of file MSDataDescColumns.h.

Constructor & Destructor Documentation

casacore::MSDataDescColumns::MSDataDescColumns ( const MSDataDescription & msDataDesc )

Create a columns object that accesses the data in the specified Table.

casacore::MSDataDescColumns::~MSDataDescColumns ( )

The destructor does nothing special.

casacore::MSDataDescColumns::MSDataDescColumns ( )

protected

casacore::MSDataDescColumns::MSDataDescColumns ( const MSDataDescColumns & )

private

Member Function Documentation

void casacore::MSDataDescColumns::attach ( const MSDataDescription & msDataDesc )

protected

void casacore::MSDataDescColumns::attachOptionalCols ( const MSDataDescription & msDataDesc )

private

ScalarColumn<Bool>& casacore::MSDataDescColumns::flagRow ( )

inline

Access to required columns.

Definition at line 85 of file MSDataDescColumns.h.

References flagRow_p.

const ScalarColumn<Bool>& casacore::MSDataDescColumns::flagRow ( ) const

inline

Const access to required columns.

Definition at line 92 of file MSDataDescColumns.h.

References flagRow_p.

ScalarColumn<Int>& casacore::MSDataDescColumns::lagId ( )

inline

Access to optional columns.

Definition at line 99 of file MSDataDescColumns.h.

References lagId_p.

const ScalarColumn<Int>& casacore::MSDataDescColumns::lagId ( ) const

inline

Const access to optional columns.

Definition at line 104 of file MSDataDescColumns.h.

References lagId_p.

Int64 casacore::MSDataDescColumns::match	(	uInt	spwId,
		uInt	polId,
		Int64	tryRow = `-1`
	)

returns the last row that contains the specified entries in the SPECTRAL_WINDOW_ID & POLARIZATION_ID columns.

Returns -1 if no match could be found. Flagged rows can never match. If tryRow is non-negative, then that row is tested to see if it matches before any others are tested. Setting tryRow to a positive value greater than the table length will throw an exception (AipsError).

rownr_t casacore::MSDataDescColumns::nrow ( ) const

inline

Convenience function that returns the number of rows in any of the columns.

Definition at line 108 of file MSDataDescColumns.h.

References flagRow_p, and casacore::TableColumn::nrow().

MSDataDescColumns& casacore::MSDataDescColumns::operator= ( const MSDataDescColumns & )

private

ScalarColumn<Int>& casacore::MSDataDescColumns::polarizationId ( )

inline

Definition at line 86 of file MSDataDescColumns.h.

References polarizationId_p.

const ScalarColumn<Int>& casacore::MSDataDescColumns::polarizationId ( ) const