casacore::TableExprGroupNull Class Reference

Class derived from TableExprGroupFuncBase representing a no function. More...

#include <ExprGroup.h>

Inheritance diagram for casacore::TableExprGroupNull:

Public Member Functions
	TableExprGroupNull (TableExprNodeRep *node)
virtual	~TableExprGroupNull ()
virtual Bool	isLazy () const
	Does the aggregate function use lazy semantics? The default implementation returns False. More...
virtual void	apply (const TableExprId &id)
	Get the operand's value for the given row and apply it to the aggregation. More...
Public Member Functions inherited from casacore::TableExprGroupFuncBase
	TableExprGroupFuncBase (TableExprNodeRep *node)
	Construct from the TaQL aggregation node. More...
virtual	~TableExprGroupFuncBase ()
uInt	seqnr () const
	Get the function's sequence nr. More...
void	setSeqnr (uInt seqnr)
	Set the function's sequence nr. More...
virtual void	finish ()
	If needed, finish the aggregation. More...
virtual CountedPtr< vector < TableExprId > >	getIds () const
	Get the assembled TableExprIds of a group. More...
virtual Bool	getBool (const vector< TableExprId > &=vector< TableExprId >())
	Get the aggregated value. More...
virtual Int64	getInt (const vector< TableExprId > &=vector< TableExprId >())
virtual Double	getDouble (const vector< TableExprId > &=vector< TableExprId >())
virtual DComplex	getDComplex (const vector< TableExprId > &=vector< TableExprId >())
virtual MVTime	getDate (const vector< TableExprId > &=vector< TableExprId >())
virtual String	getString (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Bool >	getArrayBool (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Int64 >	getArrayInt (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< Double >	getArrayDouble (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< DComplex >	getArrayDComplex (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< MVTime >	getArrayDate (const vector< TableExprId > &=vector< TableExprId >())
virtual MArray< String >	getArrayString (const vector< TableExprId > &=vector< TableExprId >())

Additional Inherited Members
Protected Attributes inherited from casacore::TableExprGroupFuncBase
TableExprNodeRep *	itsNode
TableExprNodeRep *	itsOperand
uInt	itsSeqnr

Detailed Description

Class derived from TableExprGroupFuncBase representing a no function.

Intended use:

Internal

Review Status

Test programs:

tExprGroup

Synopsis

This class represents a null aggregate function which is meant for possible aggregate functionality in UDFs.

Definition at line 266 of file ExprGroup.h.

Constructor & Destructor Documentation

casacore::TableExprGroupNull::TableExprGroupNull ( TableExprNodeRep *  node )

explicit

virtual casacore::TableExprGroupNull::~TableExprGroupNull ( )

virtual

Member Function Documentation

virtual void casacore::TableExprGroupNull::apply ( const TableExprId &  id )

virtual

Get the operand's value for the given row and apply it to the aggregation.

This function should not be called for lazy classes.

Implements casacore::TableExprGroupFuncBase.

virtual Bool casacore::TableExprGroupNull::isLazy ( ) const

virtual

Does the aggregate function use lazy semantics? The default implementation returns False.

Reimplemented from casacore::TableExprGroupFuncBase.

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

• tables/TaQL/ExprGroup.h