Envelope class for the description of a table column. More...

#include <ColumnDesc.h>

Public Types
enum	Option { Direct, Undefined, FixedShape }
	Enumerate the possible column options. More...

typedef BaseColumnDesc *	ColumnDescCtor (const String &className)
	Define the type of a XXColumnDesc construction function. More...

Public Member Functions
	ColumnDesc (const BaseColumnDesc &)
	Construct from a column description. More...

	ColumnDesc (const ColumnDesc &that)
	Copy constructor (copy semantics). More...

	ColumnDesc ()
	Default constructor (needed for ColumnDescSet). More...

	~ColumnDesc ()

ColumnDesc &	operator= (const ColumnDesc &that)
	Assignment (copy semantics). More...

Bool	operator== (const ColumnDesc &) const
	Comparison. More...

Bool	operator!= (const ColumnDesc &) const

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...

DataType	trueDataType () const
	Get the true 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 (allowing it to be changed). More...

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

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

void	setDefaultDataManager (Bool always=True)
	If `always==True` they are always set, otherwise only if empty. 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	isFixedShape () const
	Check if the column is defined with a fixed shape. More...

Bool	isScalar () const
	Test if column is a scalar. More...

Bool	isArray () const
	Test if column is an array. More...

Bool	isTable () const
	Test if column is a table. More...

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...

TableDesc *	tableDesc ()

void	show () const
	Show the column on cout. More...

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

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

RefColumn *	makeRefColumn (RefTable rtp, BaseColumn bcp) const
	Create a RefColumn column object out of this column description. More...

ConcatColumn *	makeConcatColumn (ConcatTable *rtp) const
	Create a ConcatColumn column object out of this column description. More...

Static Public Member Functions
static ColumnDescCtor *	getCtor (const String &name)
	Get a construction function for a XXColumnDesc object (thread-safe). More...

static void	registerCtor (const String &name, ColumnDescCtor *func)
	Register a "XXColumnDesc" constructor (thread-safe). More...

Protected Attributes
BaseColumnDesc *	colPtr_p

Bool	allocated_p

Private Member Functions
	ColumnDesc (BaseColumnDesc *)
	Construct from a pointer (for class BaseColumn). More...

void	checkAdd (const ColumnDescSet &cds) const
	Check if a column can be handled by ColumnDescSet. More...

void	checkRename (const ColumnDescSet &cds, const String &newName) const
	Check when a column gets renamed in a table description. More...

void	handleAdd (ColumnDescSet &cds)
	Take action after a column has been handled by ColumnDescSet. More...

void	handleRename (ColumnDescSet &cds, const String &oldName)

void	handleRemove (ColumnDescSet &cds)

void	renameAction (const String &newName, const String &oldName)
	This function allows each column to act upon a rename of another column. More...

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

void	putFile (AipsIO &ios, const TableAttr &) const
	Store the object in AipsIO. More...

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

Static Private Member Functions
static std::map< String, ColumnDescCtor * > &	getRegisterMap ()
	Define a map which maps the name of the various XXColumnDesc classes to a static function constructing them. More...

static std::map< String, ColumnDescCtor * >	initRegisterMap ()
	Register the main data managers. More...

Static Private Attributes
static Mutex	theirMutex
	A mutex for additions to the constructor map. More...

Friends
class	ColumnDescSet

class	ColumnSet

class	BaseColumn

AipsIO &	operator<< (AipsIO &ios, const ColumnDesc &cd)
	Write into AipsIO. More...

AipsIO &	operator>> (AipsIO &ios, ColumnDesc &cd)
	Read from AipsIO. More...

ostream &	operator<< (ostream &ios, const ColumnDesc &cd)
	Show on ostream. More...

Detailed Description

Envelope class for the description of a table column.

Intended use:

Public interface

Review Status

Reviewed By:: Paul Shannon
Date Reviewed:: 1994/08/11
Test programs:: none

Prerequisite

Tables module (see especially Tables.h, the module header file)
Envelope/Letter class design (see J. Coplien, Advanced C++)

Synopsis

Class ColumnDesc is an envelope for the letter class BaseColDesc and its derivations like ScalarColumnDesc,

ScalarRecordColumnDesc. ArrayColumnDesc, and SubTableDesc. ColumnDesc is meant to examine or slightly modify already existing column descriptions. It allows the retrieval of attributes like name, data type, etc.. For non-const ColumnDesc objects it is possible to modify the attributes comment and keyword set.

Since there are several types of columns, the class ColumnDesc cannot handle all details of those column types. Therefore, to create a column description, an instance of the specialized classes ArrayColumnDesc<T>, etc. has to be constructed. In there column type dependent things like array shape and default value can be defined.

This class also enumerates the possible options which can be used when defining a column via classes like ScalarColumnDesc<T>. These options are:

FixedShape: This is only useful for columns containing arrays and tables. FixedShape means that the shape of the array or table must be the same in each cell of the column. If not given, the array or table shape may vary. Option Direct forces FixedShape.
Direct: This is only useful for columns containing arrays and tables. Direct means that the data is directly stored in the table. Direct forces option FixedShape. If not given, the array or table is indirect, which implies that the data will be stored in a separate file.
Undefined: Undefined is only useful for scalars. If not given, all possible values of the scalar have a meaning. If given, a value equal to the default value in the column description is an undefined value. The function TableColumn::isDefined will return False for such values.

Example

TableDesc tableDesc("theTableDesc", TableDesc::New);
// Add a float scalar column.
tableDesc.addColumn (ScalarColumnDesc<float> ("NAME");
// Get the description of a column and change the comments.
// In order to change the comments, a reference must be used
// (because the ColumnDesc copy constructor and assign have copy
// semantics).
ColumnDesc& myColDesc = tableDesc.columnDesc ("aName");
myColDesc.comment() += "some more comments";

Motivation

When getting the description of an arbitrary column, a pointer to that description is needed to allow proper execution of virtual functions. An envelope class is needed to hide this from the user.

Definition at line 131 of file ColumnDesc.h.

Member Typedef Documentation

typedef BaseColumnDesc* casacore::ColumnDesc::ColumnDescCtor(const String &className)

Define the type of a XXColumnDesc construction function.

Definition at line 351 of file ColumnDesc.h.

Member Enumeration Documentation

enum casacore::ColumnDesc::Option

Enumerate the possible column options.

They can be combined by adding (logical or-ing) them.

Enumerator
Direct	direct table or array
Undefined	undefined values are possible
FixedShape	fixed array/table shape

Definition at line 141 of file ColumnDesc.h.

Constructor & Destructor Documentation

casacore::ColumnDesc::ColumnDesc ( const BaseColumnDesc & )

Construct from a column description.

This constructor is merely for the purpose of the automatic conversion of an object like ScalarColumnDesc<T> to ColumnDesc when adding a column to the table description using the function TableDesc::addColumn.

casacore::ColumnDesc::ColumnDesc ( const ColumnDesc & that )

Copy constructor (copy semantics).

casacore::ColumnDesc::ColumnDesc ( )

inline

Default constructor (needed for ColumnDescSet).

Definition at line 161 of file ColumnDesc.h.

casacore::ColumnDesc::~ColumnDesc ( )

casacore::ColumnDesc::ColumnDesc ( BaseColumnDesc * )

private

Construct from a pointer (for class BaseColumn).

Member Function Documentation

void casacore::ColumnDesc::checkAdd ( const ColumnDescSet & cds ) const

inlineprivate

Check if a column can be handled by ColumnDescSet.

It is called before the column gets actually added, etc..

Check if the column can be added to the table description. It is implemented for a virtual column to check if the columns it uses really exist.

Definition at line 385 of file ColumnDesc.h.

References casacore::BaseColumnDesc::checkAdd(), and colPtr_p.

void casacore::ColumnDesc::checkRename	(	const ColumnDescSet &	cds,
		const String &	newName
	)		const

inlineprivate

Check when a column gets renamed in a table description.

It is not used.

Definition at line 389 of file ColumnDesc.h.

References casacore::BaseColumnDesc::checkRename(), and colPtr_p.

const String& casacore::ColumnDesc::comment ( ) const

inline

Get comment string.

Definition at line 230 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::comment().

String& casacore::ColumnDesc::comment ( )

inline

Get comment string (allowing it to be changed).

Definition at line 234 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::comment().

const String& casacore::ColumnDesc::dataManagerGroup ( ) const

inline

Get the data manager group.

Definition at line 217 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::dataManagerGroup().

String& casacore::ColumnDesc::dataManagerGroup ( )

inline

Get the data manager group.

(allowing it to be changed).

Definition at line 222 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::dataManagerGroup().

const String& casacore::ColumnDesc::dataManagerType ( ) const

inline

Get the type name of the default data manager.

Definition at line 208 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::dataManagerType().

String& casacore::ColumnDesc::dataManagerType ( )

inline

Get the type name of the default data manager (allowing it to be changed).

Definition at line 213 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::dataManagerType().

DataType casacore::ColumnDesc::dataType ( ) const

inline

Get the data type of the column.

This always returns the type of a scalar, even when the column contains arrays.

Definition at line 194 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::dataType().

const String& casacore::ColumnDesc::dataTypeId ( ) const

inline

Get the type id for non-standard data types (i.e.

for TpOther). For standard data types the returned string is empty.

Definition at line 204 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::dataTypeId().

static ColumnDescCtor* casacore::ColumnDesc::getCtor ( const String & name )

static

Get a construction function for a XXColumnDesc object (thread-safe).

void casacore::ColumnDesc::getFile	(	AipsIO &	,
		const TableAttr &
	)

private

Get the object from AipsIO.

static std::map<String, ColumnDescCtor*>& casacore::ColumnDesc::getRegisterMap ( )

staticprivate

Define a map which maps the name of the various XXColumnDesc classes to a static function constructing them.

This is used when reading a column description back; it in fact determines the exact column type and is an easier thing to do than an enormous switch statement. The map is filled with the main XXColumnDesc construction functions by the function registerColumnDesc upon the first call of ColumnDesc::getFile.

void casacore::ColumnDesc::handleAdd ( ColumnDescSet & cds )

inlineprivate

Take action after a column has been handled by ColumnDescSet.

It is called after the column has been actually added, etc.. This gives, for instance, the virtual column class the opportunity to update the virtual column list.

Definition at line 398 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::handleAdd().

void casacore::ColumnDesc::handleRemove ( ColumnDescSet & cds )

inlineprivate

Definition at line 402 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::handleRemove().

void casacore::ColumnDesc::handleRename	(	ColumnDescSet &	cds,
		const String &	oldName
	)

inlineprivate

Definition at line 400 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::handleRename().

static std::map<String, ColumnDescCtor*> casacore::ColumnDesc::initRegisterMap ( )

staticprivate

Register the main data managers.

Bool casacore::ColumnDesc::isArray ( ) const

inline

Test if column is an array.

Definition at line 257 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::isArray().

Bool casacore::ColumnDesc::isFixedShape ( ) const

Check if the column is defined with a fixed shape.

This is always true for scalars. For arrays it is true when the FixedShape flag was set when the column was defined.

Bool casacore::ColumnDesc::isScalar ( ) const

inline

Test if column is a scalar.

Definition at line 254 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::isScalar().

Bool casacore::ColumnDesc::isTable ( ) const

inline

Test if column is a table.

Definition at line 260 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::isTable().

const TableRecord& casacore::ColumnDesc::keywordSet ( ) const

inline

Definition at line 183 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::keywordSet().

PlainColumn* casacore::ColumnDesc::makeColumn ( ColumnSet * csp ) const

inlineprivate

Create a PlainColumn column object out of this column description.

Definition at line 413 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::makeColumn().

ConcatColumn* casacore::ColumnDesc::makeConcatColumn ( ConcatTable * rtp ) const

inline

Create a ConcatColumn column object out of this column description.

Definition at line 346 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::makeConcatColumn().

RefColumn* casacore::ColumnDesc::makeRefColumn	(	RefTable *	rtp,
		BaseColumn *	bcp
	)		const

inline

Create a RefColumn column object out of this column description.

Definition at line 342 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::makeRefColumn().

uInt casacore::ColumnDesc::maxLength ( ) const

inline

Get the maximum value length.

Definition at line 303 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::maxLength().

const String& casacore::ColumnDesc::name ( ) const

Get the name of the column.

Int casacore::ColumnDesc::ndim ( ) const

inline

Get the number of dimensions.

Definition at line 264 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::ndim().

Bool casacore::ColumnDesc::operator!= ( const ColumnDesc & ) const

ColumnDesc& casacore::ColumnDesc::operator= ( const ColumnDesc & that )

Assignment (copy semantics).

Bool casacore::ColumnDesc::operator== ( const ColumnDesc & ) const

Comparison.

Two descriptions are equal when their data types, value types (scalar, array or table) and possible dimensionalities are equal.

int casacore::ColumnDesc::options ( ) const

inline

Get the options.

The possible options are defined by the enum Option. E.g.

const ColumnDesc& coldesc = tableDesc.getColumn ("column_name");
if (coldesc.option() & ColumnDesc::Direct  ==  ColumnDesc::Direct) {
// the column has the Direct flag set
}

Definition at line 245 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::options().

void casacore::ColumnDesc::putFile	(	AipsIO &	ios,
		const TableAttr &
	)		const

private

Store the object in AipsIO.

static void casacore::ColumnDesc::registerCtor	(	const String &	name,
		ColumnDescCtor *	func
	)

static

Register a "XXColumnDesc" constructor (thread-safe).

void casacore::ColumnDesc::renameAction	(	const String &	newName,
		const String &	oldName
	)

inlineprivate

This function allows each column to act upon a rename of another column.

If the old name is used internally, the column can update itself. It is called after handleRename has been called.

Definition at line 409 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::renameAction().

TableRecord& casacore::ColumnDesc::rwKeywordSet ( )

inline

Get access to the set of keywords.

Definition at line 181 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::rwKeywordSet().

void casacore::ColumnDesc::setDefaultDataManager ( Bool always = True )

inline

If always==True they are always set, otherwise only if empty.

Definition at line 226 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::setDefaultDataManager().

void casacore::ColumnDesc::setMaxLength ( uInt maxLength )

inline

Set the maximum value length.

So far, this is only possible for columns containing String values. An exception is thrown if the column data type is not TpString. Some storage managers support fixed length strings and can store them more efficiently than variable length strings.

Definition at line 311 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::setMaxLength().

void casacore::ColumnDesc::setName ( const String & name )

inline

Set the name of the column.

Definition at line 338 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::setName().

void casacore::ColumnDesc::setNdim ( uInt ndim )

inline

Set the number of dimensions.

This is only allowed for arrays. ndim can be zero to clear the number of dimensions and the shape. Otherwise it can only be used if the dimensionality has not been defined yet.

Definition at line 278 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::setNdim().

void casacore::ColumnDesc::setOptions ( int options )

inline

Set the options to the given value.

Option ColumnDesc::Direct forces FixedShape. If FixedShape is not given (implicitly or explicitly), the column can have no shape, so its shape is cleared.

Definition at line 299 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::setOptions().

void casacore::ColumnDesc::setShape ( const IPosition & shape )

inline

Set the predefined shape.

This is only allowed for arrays, for which the shape has not been defined yet. If the dimensionality has already been defined, it must match. It will set the option FixedShape if not set yet.
The first version leaves the Direct option as is. The second version sets the Direct option as given.

Definition at line 289 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::setShape().

void casacore::ColumnDesc::setShape	(	const IPosition &	shape,
		Bool	directOption
	)

inline

Definition at line 291 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::setShape().

const IPosition& casacore::ColumnDesc::shape ( ) const

inline

Get the predefined shape.

If not defined, a zero shape will be returned.

Definition at line 269 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::shape().

void casacore::ColumnDesc::show ( ) const

Show the column on cout.

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

Show the column.

const TableDesc* casacore::ColumnDesc::tableDesc ( ) const

inline

Get table description (in case column contains subtables).

Definition at line 316 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::tableDesc().

TableDesc* casacore::ColumnDesc::tableDesc ( )

inline

Definition at line 318 of file ColumnDesc.h.

References colPtr_p, and casacore::BaseColumnDesc::tableDesc().

DataType casacore::ColumnDesc::trueDataType ( ) const

Get the true data type of the column.

Unlike dataType, it returns an array data type (e.g. TpArrayInt) when the column contains arrays.

Friends And Related Function Documentation

friend class BaseColumn

friend

Definition at line 135 of file ColumnDesc.h.

friend class ColumnDescSet

friend

Definition at line 133 of file ColumnDesc.h.

friend class ColumnSet

friend

Definition at line 134 of file ColumnDesc.h.

AipsIO& operator<<	(	AipsIO &	ios,
		const ColumnDesc &	cd
	)

friend

Write into AipsIO.

ostream& operator<<	(	ostream &	ios,
		const ColumnDesc &	cd
	)

friend

Show on ostream.

AipsIO& operator>>	(	AipsIO &	ios,
		ColumnDesc &	cd
	)

friend

Read from AipsIO.

Member Data Documentation

Bool casacore::ColumnDesc::allocated_p

protected

Definition at line 425 of file ColumnDesc.h.

BaseColumnDesc* casacore::ColumnDesc::colPtr_p

protected

Definition at line 424 of file ColumnDesc.h.

Referenced by checkAdd(), checkRename(), comment(), dataManagerGroup(), dataManagerType(), dataType(), dataTypeId(), handleAdd(), handleRemove(), handleRename(), isArray(), isScalar(), isTable(), keywordSet(), makeColumn(), makeConcatColumn(), makeRefColumn(), maxLength(), ndim(), options(), renameAction(), rwKeywordSet(), setDefaultDataManager(), setMaxLength(), setName(), setNdim(), setOptions(), setShape(), shape(), and tableDesc().

Mutex casacore::ColumnDesc::theirMutex

staticprivate

A mutex for additions to the constructor map.

Definition at line 361 of file ColumnDesc.h.

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

casa/casacore/tables/Tables/ColumnDesc.h

Public Types

Public Member Functions

Static Public Member Functions

Protected Attributes

Private Member Functions

Static Private Member Functions

Static Private Attributes

Friends

Detailed Description

Intended use:

Review Status

Prerequisite

Synopsis

Example

Motivation

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation