Description of columns containing tables. More...

#include <SubTabDesc.h>

Inheritance diagram for casacore::SubTableDesc:

Public Member Functions
	SubTableDesc (const String &columnName, const String &comment, const String &tableDescName, int options=0)
	Construct from a table description with the given name. More...

	SubTableDesc (const String &columnName, const String &comment, const TableDesc &, int options=0)
	Construct from the given table description, which will be copied and frozen. More...

	SubTableDesc (const String &columnName, const String &comment, TableDesc *, int options=0)
	Construct from the given table description, which will be used directly. More...

	SubTableDesc (const SubTableDesc &)
	Copy constructor (copy semantics). More...

	~SubTableDesc ()

SubTableDesc &	operator= (const SubTableDesc &)
	Assignment (copy semantics). More...

BaseColumnDesc *	clone () const
	Clone this column description to another. More...

TableDesc *	tableDesc ()
	Get the table description. More...

String	className () const
	Get the name of this class. More...

PlainColumn *	makeColumn (ColumnSet *) const
	Create a Column column object out of this. More...

void	show (ostream &os) const
	Show the column. More...

Public Member Functions inherited from casacore::BaseColumnDesc
	BaseColumnDesc (const String &name, const String &comment, const String &dataManagerType, const String &dataManagerGroup, DataType, const String &dataTypeId, Int options, uInt ndim, const IPosition &shape, Bool isScalar, Bool isArray, Bool isTable)
	Construct the column base object. More...

	BaseColumnDesc (const BaseColumnDesc &)
	Copy constructor (copy semantics). More...

virtual	~BaseColumnDesc ()

TableRecord &	rwKeywordSet ()
	Get access to the set of keywords. More...

const TableRecord &	keywordSet () const

const String &	name () const
	Get the name of the column. More...

DataType	dataType () const
	Get the data type of the column. More...

const String &	dataTypeId () const
	Get the type id for non-standard data types (i.e. More...

const String &	dataManagerType () const
	Get the type name of the default data manager. More...

String &	dataManagerType ()
	Get the type name of the default data manager. More...

const String &	dataManagerGroup () const
	Get the data manager group. More...

String &	dataManagerGroup ()
	Get the data manager group. More...

void	setDefaultDataManager (Bool always)
	Set the data manager type and group to the default. More...

const String &	comment () const
	Get comment string. More...

String &	comment ()
	Get comment string (allowing it to be changed). More...

Int	options () const
	Get the options. More...

Bool	isScalar () const
	Test if column is scalar, array or table. More...

Bool	isArray () const

Bool	isTable () const

Int	ndim () const
	Get the number of dimensions. More...

const IPosition &	shape () const
	Get the predefined shape. More...

void	setNdim (uInt ndim)
	Set the number of dimensions. More...

void	setShape (const IPosition &shape)
	Set the predefined shape. More...

void	setShape (const IPosition &shape, Bool directOption)

void	setOptions (Int options)
	Set the options to the given value. More...

uInt	maxLength () const
	Get the maximum value length. More...

void	setMaxLength (uInt maxLength)
	Set the maximum value length. More...

const TableDesc *	tableDesc () const
	Get table description (in case column contains subtables). More...

void	setName (const String &name)
	Set the name of the column (for a rename). More...

Static Public Member Functions
static BaseColumnDesc *	makeDesc (const String &name)
	Create the object from AipsIO (this function is registered). More...

Protected Member Functions
virtual void	putDesc (AipsIO &) const
	Put the object. More...

virtual void	getDesc (AipsIO &)
	Get the object. More...

Protected Member Functions inherited from casacore::BaseColumnDesc
BaseColumnDesc &	operator= (const BaseColumnDesc &)
	Assignment (copy semantics). More...

void	putFile (AipsIO &, const TableAttr &) const
	Put the object. More...

void	getFile (AipsIO &, const TableAttr &)
	Get the object. More...

RefColumn *	makeRefColumn (RefTable , BaseColumn ) const
	Make a RefColumn object out of the description. More...

virtual ConcatColumn *	makeConcatColumn (ConcatTable *) const
	Make a ConcatColumn object out of the description. More...

Private Member Functions
Bool	readTableDesc ()
	Read table description (if passed by name). More...

void	handleAdd (ColumnDescSet &)
	Handle the addition of the subtable description (clear the flag). More...

Private Attributes
TableDesc *	tabDescPtr_p

String	tabDescTyp_p

Bool	byName_p

Bool	allocSelf_p

Bool	shallowCopy_p

Friends
class	ColumnDesc

Additional Inherited Members
Protected Attributes inherited from casacore::BaseColumnDesc
String	colName_p

String	comment_p

String	dataManType_p

String	dataManGroup_p

DataType	dtype_p

String	dtypeId_p

Int	option_p

Int	nrdim_p

IPosition	shape_p

uInt	maxLength_p

TableRecord *	keySetPtr_p

Bool	isScalar_p

Bool	isArray_p

Bool	isTable_p

Detailed Description

Description of columns containing tables.

Intended use:

Public interface

Review Status

Reviewed By:: UNKNOWN
Date Reviewed:: before2004/08/25

Prerequisite

Etymology

SubTableDesc holds a description of a subtable contained in the columns of the parent table.

Synopsis

SubTableDesc describes a table column containing subtables. The semantics of subtables are described below. The column description is constructed using a table description describing the subtable. This subtable decription or its name is stored with the column description. When a table containing this column gets created, the subtable description gets copied and this copy is thereafter frozen.

Constructing a column description for a subtable can be done in 3 ways:

It can be constructed with the name of a table description kept in a file. Only this name will be stored with the column description. Only when the table column gets created, it will read the newest version of this table description. This is a completely dynamic way of defining the column. When the subtable description in the file changes, this column in newly created tables gets the latest version.
It can be constructed with a given table description. This means that a copy of that description will be made. The frozen subtable description will be stored with the column description. This is a completely static way of defining the column.
It can be constructed with a pointer to a table description. This means that a copy will only be made when the column description gets written. Thus changes to the subtable description will as long as possible be reflected in the column description. This is a mix of the first two ways.

A column can be direct or indirect. Direct columns will be written directly in the table file. All cells in the column must have the same description and it is therefore not possible to change a description. The subtables in indirect columns will be stored in separate files. The cells in indirect columns can contain different tables.

Example

// First build the new description of a subtable.
// Define keyword subkey (integer) having value 10.
// Define columns ra and dec (double).
TableDesc subTableDesc("tTableDesc_sub", "1", TableDesc::New);
subTableDesc.keywordSet().keysInt()("subkey") = 10;
subTableDesc.addColumn (TpDouble, "ra");
subTableDesc.addColumn (TpDouble, "dec");
// Now create a new table description
TableDesc td("tTableDesc", "1", TableDesc::New);
// Add columns containing subtables.
// This is done in 3 slighty different ways, which all have
// their own (dis)advantages.
// This is described in detail at the SubTableDesc constructors.
td.addColumn (SubTableDesc("sub1", "subtable by name","tTableDesc_sub"));
td.addColumn (SubTableDesc("sub2", "subtable copy",    subTableDesc));
td.addColumn (SubTableDesc("sub3", "subtable pointer", &subTableDesc));

Motivation

Several column description classes are needed to allow the user to define attributes which are special for each column type. For columns containing a table this is the table description.

To Do

Probably only direct table descriptions should be allowed. Indirect arrays can have a shape in the description (although they can have #dim), so tables should behave similarly.

Definition at line 143 of file SubTabDesc.h.

Constructor & Destructor Documentation

casacore::SubTableDesc::SubTableDesc	(	const String &	columnName,
		const String &	comment,
		const String &	tableDescName,
		int	options = `0`
	)

Construct from a table description with the given name.

The description does not need to exist yet. Only when the table gets created, the description will be read and must exist. This means that the table description is not frozen; the most recent description will be used when creating the column.

casacore::SubTableDesc::SubTableDesc	(	const String &	columnName,
		const String &	comment,
		const TableDesc &	,
		int	options = `0`
	)

Construct from the given table description, which will be copied and frozen.

casacore::SubTableDesc::SubTableDesc	(	const String &	columnName,
		const String &	comment,
		TableDesc *	,
		int	options = `0`
	)

Construct from the given table description, which will be used directly.

The description gets frozen when the column is written. Care should be taken, because the given table description must not be deleted before the column description gets destructed.

casacore::SubTableDesc::SubTableDesc ( const SubTableDesc & )

Copy constructor (copy semantics).

casacore::SubTableDesc::~SubTableDesc ( )

Member Function Documentation

String casacore::SubTableDesc::className ( ) const

virtual

Get the name of this class.

Implements casacore::BaseColumnDesc.

BaseColumnDesc* casacore::SubTableDesc::clone ( ) const

virtual

Clone this column description to another.

Implements casacore::BaseColumnDesc.

virtual void casacore::SubTableDesc::getDesc ( AipsIO & )

protectedvirtual

Get the object.

Implements casacore::BaseColumnDesc.

void casacore::SubTableDesc::handleAdd ( ColumnDescSet & )

privatevirtual

Handle the addition of the subtable description (clear the flag).

Reimplemented from casacore::BaseColumnDesc.

PlainColumn* casacore::SubTableDesc::makeColumn ( ColumnSet * ) const

virtual

Create a Column column object out of this.

This is used by class ColumnSet to construct a table column object.

Implements casacore::BaseColumnDesc.

static BaseColumnDesc* casacore::SubTableDesc::makeDesc ( const String & name )

static

Create the object from AipsIO (this function is registered).

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

Assignment (copy semantics).

virtual void casacore::SubTableDesc::putDesc ( AipsIO & ) const

protectedvirtual

Put the object.

Implements casacore::BaseColumnDesc.

Bool casacore::SubTableDesc::readTableDesc ( )

private

Read table description (if passed by name).

If the table description is not found, a False value is returned.

void casacore::SubTableDesc::show ( ostream & os ) const

virtual

Show the column.

Implements casacore::BaseColumnDesc.

TableDesc* casacore::SubTableDesc::tableDesc ( )

virtual

Get the table description.

Thrown Exceptions

TableNoFile

Reimplemented from casacore::BaseColumnDesc.

Friends And Related Function Documentation

friend class ColumnDesc

friend

Definition at line 146 of file SubTabDesc.h.

Member Data Documentation

Bool casacore::SubTableDesc::allocSelf_p

private

Definition at line 210 of file SubTabDesc.h.

Bool casacore::SubTableDesc::byName_p

private

Definition at line 209 of file SubTabDesc.h.

Bool casacore::SubTableDesc::shallowCopy_p

private

Definition at line 211 of file SubTabDesc.h.

TableDesc* casacore::SubTableDesc::tabDescPtr_p

private

Definition at line 207 of file SubTabDesc.h.

String casacore::SubTableDesc::tabDescTyp_p

private

Definition at line 208 of file SubTabDesc.h.

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

casa/casacore/tables/Tables/SubTabDesc.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Intended use:

Review Status

Prerequisite

Etymology

Synopsis

Example

Motivation

To Do

Constructor & Destructor Documentation

Member Function Documentation

Thrown Exceptions

Friends And Related Function Documentation

Member Data Documentation