Virtual scalar column using TaQL. More...

#include <VirtualTaQLColumn.h>

Inheritance diagram for casacore::VirtualTaQLColumn:

Public Member Functions
	VirtualTaQLColumn (const String &expr, const String &style=String())
	Construct it with the given TaQL expression. More...

	VirtualTaQLColumn (const Record &spec)
	Construct it with the given specification. More...

virtual	~VirtualTaQLColumn ()
	Destructor is mandatory. More...

virtual DataManager *	clone () const
	Clone the engine object. More...

virtual Record	dataManagerSpec () const
	Get the data manager specification. More...

virtual String	dataManagerType () const
	Return the type name of the engine. More...

const String &	expression () const
	Return the TaQL expression used. More...

virtual void	setShapeColumn (const IPosition &aShape)
	Set the shape of an array in the column. More...

virtual void	setMaxLength (uInt maxLength)
	Set the maximum length of a 'fixed length' string. More...

virtual int	dataType () const
	Functions to return column info. More...

virtual Bool	isWritable () const
	Test if data can be put into this column. More...

virtual uInt	ndim (rownr_t rownr)
	Get the dimensionality of the item in the given row. More...

virtual IPosition	shape (rownr_t rownr)
	Get the shape of the item in the given row. More...

virtual Bool	isShapeDefined (rownr_t rownr)
	Is the value shape defined in the given row? By default it returns True. More...

Public Member Functions inherited from casacore::VirtualColumnEngine
	VirtualColumnEngine ()
	Create the object. More...

virtual	~VirtualColumnEngine ()

Public Member Functions inherited from casacore::DataManager
	DataManager ()
	Default constructor. More...

virtual	~DataManager ()

virtual String	dataManagerName () const
	Return the name of the data manager. More...

void	dataManagerInfo (Record &info) const
	Add SEQNR and SPEC (the DataManagerSpec subrecord) to the info. More...

virtual Record	getProperties () const
	Get data manager properties that can be modified. More...

virtual void	setProperties (const Record &spec)
	Modify data manager properties given in record fields. More...

virtual Bool	canReallocateColumns () const
	Tell if the data manager wants to reallocate the data manager column objects. More...

virtual DataManagerColumn *	reallocateColumn (DataManagerColumn *column)
	Reallocate the column object if it is part of this data manager. More...

uInt	sequenceNr () const
	Get the (unique) sequence nr of this data manager. More...

uInt	ncolumn () const
	Get the nr of columns in this data manager (can be zero). More...

Bool	asBigEndian () const
	Have the data to be stored in big or little endian canonical format? More...

const TSMOption &	tsmOption () const
	Get the TSM option. More...

MultiFileBase *	multiFile ()
	Get the MultiFile pointer (can be 0). More...

String	keywordName (const String &keyword) const
	Compose a keyword name from the given keyword appended with the sequence number (e.g. More...

String	fileName () const
	Compose a unique filename from the table name and sequence number. More...

ByteIO::OpenOption	fileOption () const
	Get the AipsIO option of the underlying file. More...

virtual Bool	isRegular () const
	Is this a regular storage manager? It is regular if it allows addition of rows and writing data in them. More...

Table &	table () const
	Get the table this object is associated with. More...

virtual void	reopenRW ()
	Reopen the data manager for read/write access. More...

virtual Bool	canAddColumn () const
	Does the data manager allow to add columns? (default no) More...

virtual Bool	canRemoveColumn () const
	Does the data manager allow to delete columns? (default no) More...

virtual Bool	canRenameColumn () const
	Does the data manager allow to rename columns? (default yes) More...

virtual void	setMaximumCacheSize (uInt nMiB)
	Set the maximum cache size (in bytes) to be used by a storage manager. More...

virtual void	showCacheStatistics (std::ostream &) const
	Show the data manager's IO statistics. More...

DataManagerColumn *	createScalarColumn (const String &columnName, int dataType, const String &dataTypeId)
	Create a column in the data manager on behalf of a table column. More...

DataManagerColumn *	createDirArrColumn (const String &columnName, int dataType, const String &dataTypeId)
	Create a direct array column. More...

DataManagerColumn *	createIndArrColumn (const String &columnName, int dataType, const String &dataTypeId)
	Create an indirect array column. More...

DataManager *	getClone () const
	Has the object already been cloned? More...

void	setClone (DataManager *clone) const
	Set the pointer to the clone. More...

Public Member Functions inherited from casacore::DataManagerColumn
	DataManagerColumn ()
	Create a column. More...

virtual	~DataManagerColumn ()
	Frees up the storage. More...

void	setIsFixedShape (Bool isFixedShape)
	Set the isFixedShape flag. More...

Bool	isFixedShape () const
	Is this a fixed shape column? More...

virtual String	dataTypeId () const
	Get the data type id of the column for dataType==TpOther. More...

void	setFixedShapeColumn (const IPosition &shape)
	Set the shape of all (fixed-shaped) arrays in the column. More...

virtual void	setShape (rownr_t rownr, const IPosition &shape)
	Set the shape of an (variable-shaped) array in the given row. More...

virtual void	setShapeTiled (rownr_t rownr, const IPosition &shape, const IPosition &tileShape)
	Set the shape and tile shape of an (variable-shaped) array in the given row. More...

virtual IPosition	tileShape (rownr_t rownr)
	Get the tile shape of the item in the given row. More...

virtual Bool	canChangeShape () const
	Can the data manager handle chaging the shape of an existing array? Default is no. More...

ColumnCache &	columnCache ()
	Get access to the ColumnCache object. More...

const ColumnCache *	columnCachePtr () const

void	get (rownr_t rownr, Bool *dataPtr)
	Get the scalar value in the given row. More...

void	get (rownr_t rownr, uChar *dataPtr)

void	get (rownr_t rownr, Short *dataPtr)

void	get (rownr_t rownr, uShort *dataPtr)

void	get (rownr_t rownr, Int *dataPtr)

void	get (rownr_t rownr, uInt *dataPtr)

void	get (rownr_t rownr, Int64 *dataPtr)

void	get (rownr_t rownr, float *dataPtr)

void	get (rownr_t rownr, double *dataPtr)

void	get (rownr_t rownr, Complex *dataPtr)

void	get (rownr_t rownr, DComplex *dataPtr)

void	get (rownr_t rownr, String *dataPtr)

void	get (rownr_t rownr, void *dataPtr)
	This function is the get for all non-standard data types. More...

void	put (rownr_t rownr, const Bool *dataPtr)
	Put the scalar value into the given row. More...

void	put (rownr_t rownr, const uChar *dataPtr)

void	put (rownr_t rownr, const Short *dataPtr)

void	put (rownr_t rownr, const uShort *dataPtr)

void	put (rownr_t rownr, const Int *dataPtr)

void	put (rownr_t rownr, const uInt *dataPtr)

void	put (rownr_t rownr, const Int64 *dataPtr)

void	put (rownr_t rownr, const float *dataPtr)

void	put (rownr_t rownr, const double *dataPtr)

void	put (rownr_t rownr, const Complex *dataPtr)

void	put (rownr_t rownr, const DComplex *dataPtr)

void	put (rownr_t rownr, const String *dataPtr)

void	put (rownr_t rownr, const void *dataPtr)
	This function is the put for all non-standard data types. More...

virtual void	putScalarColumnV (const ArrayBase &dataPtr)
	Put all scalar values in the column. More...

virtual void	putScalarColumnCellsV (const RefRows &rownrs, const ArrayBase &dataPtr)
	Put some scalar values in the column. More...

virtual void	putArrayV (rownr_t rownr, const ArrayBase &data)
	Put the array value into the given row. More...

virtual void	getArrayColumnV (ArrayBase &data)
	Get all array values in the column. More...

virtual void	putArrayColumnV (const ArrayBase &data)
	Put all array values in the column. More...

virtual void	getArrayColumnCellsV (const RefRows &rownrs, ArrayBase &data)
	Get some array values in the column. More...

virtual void	putArrayColumnCellsV (const RefRows &rownrs, const ArrayBase &data)
	Put some array values in the column. More...

virtual void	getSliceV (rownr_t rownr, const Slicer &slicer, ArrayBase &data)
	Get a section of the array in the given row. More...

virtual void	putSliceV (rownr_t rownr, const Slicer &slicer, const ArrayBase &data)
	Put into a section of the array in the given row. More...

virtual void	getColumnSliceV (const Slicer &slicer, ArrayBase &data)
	Get a section of all arrays in the column. More...

virtual void	putColumnSliceV (const Slicer &slicer, const ArrayBase &data)
	Put into a section of all arrays in the column. More...

virtual void	getColumnSliceCellsV (const RefRows &rownrs, const Slicer &slicer, ArrayBase &data)
	Get a section of some arrays in the column. More...

virtual void	putColumnSliceCellsV (const RefRows &rownrs, const Slicer &slicer, const ArrayBase &data)
	Put into a section of some arrays in the column. More...

void	throwGet () const
	Throw an "invalid operation" exception for the default implementation of get. More...

void	throwPut () const
	Throw an "invalid operation" exception for the default implementation of put. More...

void	setColumnName (const String &colName)
	Set the column name. More...

const String &	columnName () const
	Get rhe column name. More...

Static Public Member Functions
static String	className ()
	Return the name of the class. More...

static void	registerClass ()
	Register the class name and the static makeObject "constructor". More...

static DataManager *	makeObject (const String &dataManagerName, const Record &spec)
	Define the "constructor" to construct this engine when a table is read back. More...

Static Public Member Functions inherited from casacore::DataManager
static void	registerCtor (const String &type, DataManagerCtor func)
	Register a mapping of a data manager type to its static construction function. More...

static DataManagerCtor	getCtor (const String &dataManagerType)
	Get the "constructor" of a data manager (thread-safe). More...

static Bool	isRegistered (const String &dataManagerType)
	Test if a data manager is registered (thread-safe). More...

static DataManager *	unknownDataManager (const String &dataManagerType, const Record &spec)
	Serve as default function for theirRegisterMap, which catches all unknown data manager types. More...

Private Member Functions
	VirtualTaQLColumn (const VirtualTaQLColumn &)
	Copy is not needed and therefore forbidden (so it is made private). More...

VirtualTaQLColumn &	operator= (const VirtualTaQLColumn &)
	Assignment is not needed and therefore forbidden (so it is made private). More...

virtual DataManagerColumn *	makeScalarColumn (const String &columnName, int dataType, const String &)
	Create the column object for the scalar column in this engine. More...

virtual DataManagerColumn *	makeIndArrColumn (const String &columnName, int dataType, const String &dataTypeId)
	Create the column object for the indirect array column in this engine. More...

virtual void	create64 (rownr_t)
	Let the engine initialize the object for a new table. More...

virtual void	prepare ()
	Prepare compiles the expression. More...

virtual void	getBool (rownr_t rownr, Bool *dataPtr)
	Get the scalar value in the given row. More...

virtual void	getuChar (rownr_t rownr, uChar *dataPtr)

virtual void	getShort (rownr_t rownr, Short *dataPtr)

virtual void	getuShort (rownr_t rownr, uShort *dataPtr)

virtual void	getInt (rownr_t rownr, Int *dataPtr)

virtual void	getuInt (rownr_t rownr, uInt *dataPtr)

virtual void	getInt64 (rownr_t rownr, Int64 *dataPtr)

virtual void	getfloat (rownr_t rownr, float *dataPtr)

virtual void	getdouble (rownr_t rownr, double *dataPtr)

virtual void	getComplex (rownr_t rownr, Complex *dataPtr)

virtual void	getDComplex (rownr_t rownr, DComplex *dataPtr)

virtual void	getString (rownr_t rownr, String *dataPtr)

virtual void	getArrayV (rownr_t rownr, ArrayBase &arr)
	Get the array value in the given row. More...

void	getResult (rownr_t rownr)
	Get the array result into itsCurArray. More...

void	makeCurArray ()
	Make the result cache. More...

virtual void	getScalarColumnV (ArrayBase &arr)
	Get functions implemented by means of their DataManagerColumn::getXXBase counterparts, but optimized for constant expressions. More...

virtual void	getScalarColumnCellsV (const RefRows &rownrs, ArrayBase &arr)
	Get some scalar values in the column. More...

void	fillColumnCache ()
	Fill the ColumnCache object with a constant scalar value. More...

void	fillArray (ArrayBase &data)
	Fill an array with a constant scalar value. More...

Private Attributes
int	itsDataType

Bool	itsIsArray

Bool	itsIsConst

Bool	itsTempWritable

String	itsColumnName

String	itsExpr

String	itsStyle

TableExprNode *	itsNode

IPosition	itsShape

uInt	itsMaxLen

union {
Bool itsBool

uChar itsuChar

Short itsShort

uShort itsuShort

Int itsInt

uInt itsuInt

Int64 itsInt64

Float itsFloat

Double itsDouble

};

Complex	itsComplex

DComplex	itsDComplex

String	itsString

ArrayBase *	itsCurArray

rownr_t	itsCurRow

Additional Inherited Members
Static Public Attributes inherited from casacore::DataManager
static rownr_t	MAXROWNR32
	Define the highest row number that can be represented as signed 32-bit. More...

Protected Member Functions inherited from casacore::DataManager
void	decrementNcolumn ()
	Decrement number of columns (in case a column is deleted). More...

void	setEndian (Bool bigEndian)
	Tell the data manager if big or little endian format is needed. More...

void	setTsmOption (const TSMOption &tsmOption)
	Tell the data manager which TSM option to use. More...

void	setMultiFile (MultiFileBase *mfile)
	Tell the data manager that MultiFile can be used. More...

virtual Bool	hasMultiFileSupport () const
	Does the data manager support use of MultiFile? A derived class has to return True if it can use the MultiFile. More...

void	throwDataTypeOther (const String &columnName, int dataType) const
	Throw an exception in case data type is TpOther, because the storage managers (and maybe other data managers) do not support such columns. More...

Protected Member Functions inherited from casacore::DataManagerColumn
virtual void	getOther (rownr_t rownr, void *dataPtr)
	This function is the get for all non-standard data types. More...

virtual void	putBool (rownr_t rownr, const Bool *dataPtr)
	Put the scalar value into the given row. More...

virtual void	putuChar (rownr_t rownr, const uChar *dataPtr)

virtual void	putShort (rownr_t rownr, const Short *dataPtr)

virtual void	putuShort (rownr_t rownr, const uShort *dataPtr)

virtual void	putInt (rownr_t rownr, const Int *dataPtr)

virtual void	putuInt (rownr_t rownr, const uInt *dataPtr)

virtual void	putInt64 (rownr_t rownr, const Int64 *dataPtr)

virtual void	putfloat (rownr_t rownr, const float *dataPtr)

virtual void	putdouble (rownr_t rownr, const double *dataPtr)

virtual void	putComplex (rownr_t rownr, const Complex *dataPtr)

virtual void	putDComplex (rownr_t rownr, const DComplex *dataPtr)

virtual void	putString (rownr_t rownr, const String *dataPtr)

virtual void	putOther (rownr_t rownr, const void *dataPtr)
	This function is the put for all non-standard data types. More...

void	getScalarColumnBase (ArrayBase &dataPtr)
	The default implementations of get and put functions. More...

void	putScalarColumnBase (const ArrayBase &dataPtr)

void	getScalarColumnCellsBase (const RefRows &rownrs, ArrayBase &dataPtr)

void	putScalarColumnCellsBase (const RefRows &rownrs, const ArrayBase &dataPtr)

void	getArrayColumnBase (ArrayBase &data)

void	putArrayColumnBase (const ArrayBase &data)

void	getArrayColumnCellsBase (const RefRows &rownrs, ArrayBase &data)

void	putArrayColumnCellsBase (const RefRows &rownrs, const ArrayBase &data)

void	getSliceBase (rownr_t rownr, const Slicer &slicer, ArrayBase &data)

void	putSliceBase (rownr_t rownr, const Slicer &slicer, const ArrayBase &data)

void	getColumnSliceBase (const Slicer &slicer, ArrayBase &data)

void	putColumnSliceBase (const Slicer &slicer, const ArrayBase &data)

void	getColumnSliceCellsBase (const RefRows &rownrs, const Slicer &slicer, ArrayBase &data)

void	putColumnSliceCellsBase (const RefRows &rownrs, const Slicer &slicer, const ArrayBase &data)

Detailed Description

Virtual scalar column using TaQL.

Review Status

Reviewed By:: GvD
Date Reviewed:: 2004/07/09

Prerequisite

VirtualScalarColumn

Synopsis

VirtualTaQLColumn is a virtual column engine to define the contents of a column as a TaQL CALC expression in which possibly other columns are used. It is (of course) only possible to get data from the column; puts cannot be done. See note 199 for a description of TaQL. The TaQL style can be specified (such as 0- or 1-based indexing).
The expression result can be a scalar or array of the basic TaQL data types. The column data type has to be conformant with that TaQL type, thus a column of any integer type has to be used for an integer TaQL result.
Constant expressions are precalculated and cached making the retrieval of e.g. the full column much faster (factor 4).
A possible use for a virtual TaQL column is a column in a MeasurementSet containing a constant value. It could also be used for on-the-fly calculation of J2000 UVW-values or HADEC using an expression such as "derivedmscal.newuvw()"
Caution: One has to be careful with deleting columns; If in an existing table a TaQL expression uses a deleted column, the expression cannot be parsed anymore and the table cannot be opened anymore; In the future the Table System will be made more forgiving;

Example

The following example creates a table with a few columns. One column is virtual and has a random value if Col3 is true. Otherwise it has value 0.

// Create the table description.
TableDesc td;
td.addColumn (ScalarColumnDesc<DComplex>("Col1"));
td.addColumn (ScalarColumnDesc<Int>("Col2"));
td.addColumn (ScalarColumnDesc<Bool>("Col3"));
td.addColumn (ScalarColumnDesc<Double>("ColVirt"));
// Now create a new table from the description.
SetupNewTable newTab("tmtest", td, Table::New);
// Define the expression of the virtual column and bind the column to it.
// The other columns are by default bound to StandardStMan.
VirtualTaQLColumn engine("iif(Col3,rand(),0)");
newTab.bindColumn("ColVirt", engine);
Table tab(newTab);

Definition at line 97 of file VirtualTaQLColumn.h.

Constructor & Destructor Documentation

casacore::VirtualTaQLColumn::VirtualTaQLColumn	(	const String &	expr,
		const String &	style = `String()`
	)

Construct it with the given TaQL expression.

casacore::VirtualTaQLColumn::VirtualTaQLColumn ( const Record & spec )

Construct it with the given specification.

virtual casacore::VirtualTaQLColumn::~VirtualTaQLColumn ( )

virtual

Destructor is mandatory.

casacore::VirtualTaQLColumn::VirtualTaQLColumn ( const VirtualTaQLColumn & )

private

Copy is not needed and therefore forbidden (so it is made private).

Member Function Documentation

static String casacore::VirtualTaQLColumn::className ( )

static

Return the name of the class.

virtual DataManager* casacore::VirtualTaQLColumn::clone ( ) const

virtual

Clone the engine object.

Implements casacore::DataManager.

virtual void casacore::VirtualTaQLColumn::create64 ( rownr_t )

privatevirtual

Let the engine initialize the object for a new table.

It defines a column keyword holding the expression.

Reimplemented from casacore::VirtualColumnEngine.

virtual Record casacore::VirtualTaQLColumn::dataManagerSpec ( ) const

virtual

Get the data manager specification.

Reimplemented from casacore::DataManager.

virtual String casacore::VirtualTaQLColumn::dataManagerType ( ) const

virtual

Return the type name of the engine.

(i.e. its class name VirtualTaQLColumn).

Implements casacore::DataManager.

virtual int casacore::VirtualTaQLColumn::dataType ( ) const

virtual

Functions to return column info.

Implements casacore::DataManagerColumn.

const String& casacore::VirtualTaQLColumn::expression ( ) const

inline

Return the TaQL expression used.

Definition at line 137 of file VirtualTaQLColumn.h.

References itsExpr.

void casacore::VirtualTaQLColumn::fillArray ( ArrayBase & data )

private

Fill an array with a constant scalar value.

void casacore::VirtualTaQLColumn::fillColumnCache ( )

private

Fill the ColumnCache object with a constant scalar value.

virtual void casacore::VirtualTaQLColumn::getArrayV	(	rownr_t	rownr,
		ArrayBase &	arr
	)

privatevirtual

Get the array value in the given row.

The array given by arr has to have the correct shape (which is guaranteed by the ArrayColumn get function).

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getBool	(	rownr_t	rownr,
		Bool *	dataPtr
	)

privatevirtual

Get the scalar value in the given row.

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getComplex	(	rownr_t	rownr,
		Complex *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getDComplex	(	rownr_t	rownr,
		DComplex *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getdouble	(	rownr_t	rownr,
		double *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getfloat	(	rownr_t	rownr,
		float *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getInt	(	rownr_t	rownr,
		Int *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getInt64	(	rownr_t	rownr,
		Int64 *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

void casacore::VirtualTaQLColumn::getResult ( rownr_t rownr )

private

Get the array result into itsCurArray.

virtual void casacore::VirtualTaQLColumn::getScalarColumnCellsV	(	const RefRows &	rownrs,
		ArrayBase &	dataPtr
	)

privatevirtual

Get some scalar values in the column.

The vector given in data has to have the correct length (which is guaranteed by the ScalarColumn getColumn function). The default implementation does a getXX per row.

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getScalarColumnV ( ArrayBase & arr )

privatevirtual

Get functions implemented by means of their DataManagerColumn::getXXBase counterparts, but optimized for constant expressions.

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getShort	(	rownr_t	rownr,
		Short *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getString	(	rownr_t	rownr,
		String *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getuChar	(	rownr_t	rownr,
		uChar *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getuInt	(	rownr_t	rownr,
		uInt *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::getuShort	(	rownr_t	rownr,
		uShort *	dataPtr
	)

privatevirtual

Reimplemented from casacore::DataManagerColumn.

virtual Bool casacore::VirtualTaQLColumn::isShapeDefined ( rownr_t rownr )

virtual

Is the value shape defined in the given row? By default it returns True.

Reimplemented from casacore::DataManagerColumn.

virtual Bool casacore::VirtualTaQLColumn::isWritable ( ) const

virtual

Test if data can be put into this column.

This does not test if the data file is writable, only if it is in principle allowed to store data into the column. (It may not be allowed for virtual columns). The default is True.

Reimplemented from casacore::DataManagerColumn.

void casacore::VirtualTaQLColumn::makeCurArray ( )

private

Make the result cache.

virtual DataManagerColumn* casacore::VirtualTaQLColumn::makeIndArrColumn	(	const String &	columnName,
		int	dataType,
		const String &	dataTypeId
	)

privatevirtual

Create the column object for the indirect array column in this engine.

Reimplemented from casacore::VirtualColumnEngine.

static DataManager* casacore::VirtualTaQLColumn::makeObject	(	const String &	dataManagerName,
		const Record &	spec
	)

static

Define the "constructor" to construct this engine when a table is read back.

This "constructor" has to be registered by the user of the engine. If the engine is commonly used, its registration can be added into the registerAllCtor function in DataManReg.cc. This function gets automatically invoked by the table system.

virtual DataManagerColumn* casacore::VirtualTaQLColumn::makeScalarColumn	(	const String &	columnName,
		int	dataType,
		const String &
	)

privatevirtual

Create the column object for the scalar column in this engine.

Reimplemented from casacore::VirtualColumnEngine.

virtual uInt casacore::VirtualTaQLColumn::ndim ( rownr_t rownr )

virtual

Get the dimensionality of the item in the given row.

By default it returns shape(rownr).nelements().

Reimplemented from casacore::DataManagerColumn.

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

private

Assignment is not needed and therefore forbidden (so it is made private).

virtual void casacore::VirtualTaQLColumn::prepare ( )

privatevirtual

Prepare compiles the expression.

Reimplemented from casacore::VirtualColumnEngine.

static void casacore::VirtualTaQLColumn::registerClass ( )

static

Register the class name and the static makeObject "constructor".

This will make the engine known to the table system.

virtual void casacore::VirtualTaQLColumn::setMaxLength ( uInt maxLength )

virtual

Set the maximum length of a 'fixed length' string.

It is only called (right after the constructor) if the string has a fixed length.

Reimplemented from casacore::DataManagerColumn.

virtual void casacore::VirtualTaQLColumn::setShapeColumn ( const IPosition & aShape )

virtual

Set the shape of an array in the column.

It is only called (right after the constructor) if the array has a fixed shape.

Reimplemented from casacore::DataManagerColumn.

virtual IPosition casacore::VirtualTaQLColumn::shape ( rownr_t rownr )

virtual

Get the shape of the item in the given row.

By default it returns a zero-length IPosition (for a scalar value).

Reimplemented from casacore::DataManagerColumn.

Member Data Documentation

union { ... }

Bool casacore::VirtualTaQLColumn::itsBool

Definition at line 235 of file VirtualTaQLColumn.h.

String casacore::VirtualTaQLColumn::itsColumnName

private

Definition at line 228 of file VirtualTaQLColumn.h.

Complex casacore::VirtualTaQLColumn::itsComplex

private

Definition at line 245 of file VirtualTaQLColumn.h.

ArrayBase* casacore::VirtualTaQLColumn::itsCurArray

private

Definition at line 248 of file VirtualTaQLColumn.h.

rownr_t casacore::VirtualTaQLColumn::itsCurRow

private

Definition at line 249 of file VirtualTaQLColumn.h.

int casacore::VirtualTaQLColumn::itsDataType

private

Definition at line 224 of file VirtualTaQLColumn.h.

DComplex casacore::VirtualTaQLColumn::itsDComplex

private

Definition at line 246 of file VirtualTaQLColumn.h.

Double casacore::VirtualTaQLColumn::itsDouble

Definition at line 243 of file VirtualTaQLColumn.h.

String casacore::VirtualTaQLColumn::itsExpr

private

Definition at line 229 of file VirtualTaQLColumn.h.

Referenced by expression().

Float casacore::VirtualTaQLColumn::itsFloat

Definition at line 242 of file VirtualTaQLColumn.h.

Int casacore::VirtualTaQLColumn::itsInt

Definition at line 239 of file VirtualTaQLColumn.h.

Int64 casacore::VirtualTaQLColumn::itsInt64

Definition at line 241 of file VirtualTaQLColumn.h.

Bool casacore::VirtualTaQLColumn::itsIsArray

private

Definition at line 225 of file VirtualTaQLColumn.h.

Bool casacore::VirtualTaQLColumn::itsIsConst

private

Definition at line 226 of file VirtualTaQLColumn.h.

uInt casacore::VirtualTaQLColumn::itsMaxLen

private

Definition at line 233 of file VirtualTaQLColumn.h.

TableExprNode* casacore::VirtualTaQLColumn::itsNode

private

Definition at line 231 of file VirtualTaQLColumn.h.

IPosition casacore::VirtualTaQLColumn::itsShape

private

Definition at line 232 of file VirtualTaQLColumn.h.

Short casacore::VirtualTaQLColumn::itsShort

Definition at line 237 of file VirtualTaQLColumn.h.

String casacore::VirtualTaQLColumn::itsString

private

Definition at line 247 of file VirtualTaQLColumn.h.

String casacore::VirtualTaQLColumn::itsStyle

private

Definition at line 230 of file VirtualTaQLColumn.h.

Bool casacore::VirtualTaQLColumn::itsTempWritable

private

Definition at line 227 of file VirtualTaQLColumn.h.

uChar casacore::VirtualTaQLColumn::itsuChar

Definition at line 236 of file VirtualTaQLColumn.h.

uInt casacore::VirtualTaQLColumn::itsuInt

Definition at line 240 of file VirtualTaQLColumn.h.

uShort casacore::VirtualTaQLColumn::itsuShort

Definition at line 238 of file VirtualTaQLColumn.h.

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

tables/DataMan/VirtualTaQLColumn.h

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