Scalar column in table select expression tree. More...

#include <ExprDerNode.h>

Inheritance diagram for casa::TableExprNodeColumn:

Public Member Functions
	TableExprNodeColumn (const Table &, const String &columnName)
	~TableExprNodeColumn ()
virtual void	replaceTablePtr (const Table &)
	Replace the Table pointer in this node.
Bool	getBool (const TableExprId &id)
	Is the expression a column aggregate function?
Int64	getInt (const TableExprId &id)
Double	getDouble (const TableExprId &id)
DComplex	getDComplex (const TableExprId &id)
String	getString (const TableExprId &id)
const ROTableColumn &	getColumn () const
Bool	getColumnDataType (DataType &) const
	Get the data type of this scalar column.
Array< Bool >	getColumnBool ()
	Get the value of the expression evaluated for the entire column.
Array< uChar >	getColumnuChar ()
Array< Short >	getColumnShort ()
Array< uShort >	getColumnuShort ()
Array< Int >	getColumnInt ()
Array< uInt >	getColumnuInt ()
Array< Float >	getColumnFloat ()
Array< Double >	getColumnDouble ()
Array< Complex >	getColumnComplex ()
Array< DComplex >	getColumnDComplex ()
Array< String >	getColumnString ()
Static Public Member Functions
static Unit	getColumnUnit (const ROTableColumn &)
	Get the column unit (can be empty).
Protected Attributes
ROTableColumn *	tabColPtr_p

Detailed Description

Scalar column in table select expression tree.

Intended use:

Internal

Review Status

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

Prerequisite

TableExprNode

Synopsis

This class represents a scalar column in a table select expression tree. When the select expression gets evaluated, the value of the given row in the column is used.

Definition at line 298 of file ExprDerNode.h.

Constructor & Destructor Documentation

casa::TableExprNodeColumn::TableExprNodeColumn	(	const Table &	,
		const String &	columnName
	)

casa::TableExprNodeColumn::~TableExprNodeColumn ( )

Member Function Documentation

Bool casa::TableExprNodeColumn::getBool ( const TableExprId & id ) [virtual]

Is the expression a column aggregate function?

virtual Bool isAggregate() const; Get a scalar value for this node in the given row. The appropriate functions are implemented in the derived classes and will usually invoke the get in their children and apply the operator on the resulting values.

Reimplemented from casa::TableExprNodeRep.

const ROTableColumn& casa::TableExprNodeColumn::getColumn ( ) const