#include <EpochEngine.h>

Public Member Functions
	EpochEngine ()

virtual	~EpochEngine ()

Bool	sidFrac () const
	Tell if the fraction has to be used for sidereal times. More...

Array< Double >	getArrayDouble (const TableExprId &id)
	Get the values. More...

Array< MEpoch >	getEpochs (const TableExprId &id)
	Get the epochs. More...

void	handleEpoch (std::vector< TENShPtr > &args, uInt &argnr)
	Handle the argument(s) giving the input epochs and reference type. More...

void	setConverter (MEpoch::Types toType, Bool sidFrac)
	Set the MeasConvert object. More...

void	setPositionEngine (PositionEngine &engine)
	Set the possible position engine. More...

Public Member Functions inherited from casacore::MeasEngine< MEpoch >
	MeasEngine ()

virtual	~MeasEngine ()

M::Types	refType () const
	Get the reference type. More...

Bool	handleMeasType (const TENShPtr &operand, Bool doThrow)
	Handle a doppler reference type. More...

Record	makeAttributes (typename M::Types refType, Int valueType=1) const
	Make the expression result attributes. More...

Public Member Functions inherited from casacore::BaseEngine
	BaseEngine ()

virtual	~BaseEngine ()

void	adaptForConstant (const IPosition &shapeConstant, uInt nvalues=0)
	Adapt the output shape and dimensionality for possible constant values. More...

void	extendBase (const BaseEngine &, Bool removeFirstAxis=False)
	Extend the shape (if not empty) with the engine's shape. More...

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

Int	ndim () const
	Get the output dimensionality. More...

const Unit &	unit () const
	Get the unit of the function's result. More...

const Unit &	inUnit () const
	Get the unit of the expression. More...

Bool	isConstant () const
	Tell if the expression is constant. More...

Private Member Functions
virtual String	stripMeasType (const String &type)
	Strip a possible prefix from the epoch type. More...

virtual void	handleValues (TableExprNode &operand, const TableExprId &id, Array< MEpoch > &epochs)
	Let a derive class handle the values. More...

Private Attributes
Bool	itsSidFrac

MeasFrame	itsFrame

MEpoch::Convert	itsConverter

PositionEngine *	itsPositionEngine

Additional Inherited Members
Protected Member Functions inherited from casacore::MeasEngine< MEpoch >
void	handleMeasArray (const TENShPtr &operand)
	Handle the operand representing an array of Meas values. More...

void	handleConstant (const TENShPtr &operand)
	Handle a constant Meas value. More...

Protected Member Functions inherited from casacore::BaseEngine
virtual void	deriveAttr (const Unit &unit, Int nval)
	Let a derived class derive its attributes. More...

virtual void	setValueType (Int valueType)
	Let a derived class set its value type. More...

Protected Attributes inherited from casacore::MeasEngine< MEpoch >
Array< MEpoch >	itsConstants

M::Types	itsRefType

ScalarMeasColumn< MEpoch >	itsMeasScaCol

ArrayMeasColumn< MEpoch >	itsMeasArrCol

Protected Attributes inherited from casacore::BaseEngine
Bool	itsIsConst

IPosition	itsShape

Int	itsNDim

Unit	itsInUnit

Unit	itsOutUnit

TableExprNode	itsExprNode

Detailed Description

Engine for TaQL UDF Epoch conversions

Intended use:

Public interface

Review Status

Test programs:: tMeas

Prerequisite

EngineBase

Synopsis

EpochEngine defines Engines (user defined functions) that can be used in TaQL to convert Measures for epochs. In this way such derived values appear to be ordinary TaQL functions.

In TaQL these functions can be called like:

meas.epoch (toref, time, fromref)
meas.last (time, fromref, pos, posref)
For example,
meas.epoch ('UTC', 1e9 s, 'WGS84')

toref is a single constant string.
pos can have various value types. A single numeric array is a series of RA,DEC in J2000. If given as a set, the last argument of the set can be the reference types of the values in the set. The values can be strings (indicating planetary objects) or value pairs giving lon,lat. The default reference type is J2000.

All functions have data type double and unit radian.

A epoch can also be a table column which usually knows its type. It can also be an expression (e.g. EPOCH[0,]) which also knows the type.

Motivation

It makes it possible to handle measures in TaQL.

Definition at line 90 of file EpochEngine.h.

Constructor & Destructor Documentation

◆ EpochEngine()

casacore::EpochEngine::EpochEngine ( )

◆ ~EpochEngine()

virtual casacore::EpochEngine::~EpochEngine ( )

virtual

Member Function Documentation

◆ getArrayDouble()

Array<Double> casacore::EpochEngine::getArrayDouble ( const TableExprId & id )

Get the values.

◆ getEpochs()

Array<MEpoch> casacore::EpochEngine::getEpochs ( const TableExprId & id )

Get the epochs.

◆ handleEpoch()

void casacore::EpochEngine::handleEpoch	(	std::vector< TENShPtr > &	args,
		uInt &	argnr
	)

Handle the argument(s) giving the input epochs and reference type.

The epoch can be a column in a table.

◆ handleValues()

virtual void casacore::EpochEngine::handleValues	(	TableExprNode &	operand,
		const TableExprId &	id,
		Array< MEpoch > &	positions
	)

privatevirtual

Let a derive class handle the values.

Implements casacore::MeasEngine< MEpoch >.

◆ setConverter()

void casacore::EpochEngine::setConverter	(	MEpoch::Types	toType,
		Bool	sidFrac
	)

Set the MeasConvert object.

◆ setPositionEngine()

void casacore::EpochEngine::setPositionEngine ( PositionEngine & engine )

Set the possible position engine.

It can be done only once.

◆ sidFrac()

Bool casacore::EpochEngine::sidFrac ( ) const

inline

Tell if the fraction has to be used for sidereal times.

Definition at line 98 of file EpochEngine.h.

References itsSidFrac.

◆ stripMeasType()

virtual String casacore::EpochEngine::stripMeasType ( const String & type )

privatevirtual

Strip a possible prefix from the epoch type.

Reimplemented from casacore::BaseEngine.

Member Data Documentation

◆ itsConverter

MEpoch::Convert casacore::EpochEngine::itsConverter

private

Definition at line 129 of file EpochEngine.h.

◆ itsFrame

MeasFrame casacore::EpochEngine::itsFrame

private

Definition at line 128 of file EpochEngine.h.

◆ itsPositionEngine

PositionEngine* casacore::EpochEngine::itsPositionEngine

private

Definition at line 130 of file EpochEngine.h.

◆ itsSidFrac

Bool casacore::EpochEngine::itsSidFrac

private

Definition at line 127 of file EpochEngine.h.

Referenced by sidFrac().

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

meas/MeasUDF/EpochEngine.h

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Intended use:

Review Status

Prerequisite

Synopsis

Motivation

Constructor & Destructor Documentation

◆ EpochEngine()

◆ ~EpochEngine()

Member Function Documentation

◆ getArrayDouble()

◆ getEpochs()

◆ handleEpoch()

◆ handleValues()

◆ setConverter()

◆ setPositionEngine()

◆ sidFrac()

◆ stripMeasType()

Member Data Documentation

◆ itsConverter

◆ itsFrame

◆ itsPositionEngine

◆ itsSidFrac