casa::TableExprFuncNode Class Reference
[Tables_internal_classes]

#include <ExprFuncNode.h>

Inheritance diagram for casa::TableExprFuncNode:

[legend]Collaboration diagram for casa::TableExprFuncNode:

[legend]List of all members.

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Detailed Description

Class representing a function in table select expression.

Intended use:

Internal

Review Status

Reviewed By:

UNKNOWN

Date Reviewed:

before2004/08/25

Prerequisite

• TableExprNodeMulti

Synopsis

This class represents a function in a table select tree. The rownumber function is represented by class TableExprNodeRownr . The rowid function is represented by class TableExprNodeRowid . The rand function is represented by class TableExprNodeRandom .

When one wants to add a function to the table selection grammar, the following has to be done:

• Add the function to the enum below.
• Implement the function in the get functions in ExprFuncNode(Array).cc.
• Implement the function in the checkOperands in ExprFuncNode.cc.
• Declare and define the function in ExprNode.h (for C++ binding).
• Add the function to findFunc in TableParse.cc (for TaQL).

Definition at line 74 of file ExprFuncNode.h.

Public Types
enum	FunctionType
Public Member Functions
	TableExprFuncNode (FunctionType, NodeDataType, ValueType, const TableExprNodeSet &source)
	Constructor.
	~TableExprFuncNode ()
	Destructor.
Bool	getBool (const TableExprId &id)
	'get' Functions to get the desired result of a function
Double	getDouble (const TableExprId &id)
DComplex	getDComplex (const TableExprId &id)
String	getString (const TableExprId &id)
Regex	getRegex (const TableExprId &id)
MVTime	getDate (const TableExprId &id)
PtrBlock< TableExprNodeRep * >	operands ()
	Some functions to be used by TableExprNodeFuncArray.
FunctionType	funcType () const
NodeDataType	argDataType () const
Static Public Member Functions
static NodeDataType	checkOperands (Block< Int > &dtypeOper, ValueType &resVT, Block< Int > &vtypeOper, FunctionType, PtrBlock< TableExprNodeRep * > &)
	Check the data and value types of the operands.
static void	fillUnits (TableExprNodeRep *node, PtrBlock< TableExprNodeRep * > &nodes, FunctionType func)
	Fill the result unit in the node.
static TableExprNodeRep *	fillNode (TableExprFuncNode *thisNode, PtrBlock< TableExprNodeRep * > &nodes, const Block< Int > &dtypeOper)
	Link the children to the node and convert the children to constants if possible.
static void	fillChildNodes (TableExprFuncNode *thisNode, PtrBlock< TableExprNodeRep * > &nodes, const Block< Int > &dtypeOper)
	Link the children to the node and convert the children to constants if possible.
static void	fillUnit (TableExprNodeRep &node, FunctionType func)
	Fill the unit of the node for the functions with a predefined unit (like asin).
Private Member Functions
void	tryToConst ()
	Try if the function gives a constant result.
Static Private Member Functions
static const Unit &	makeEqualUnits (PtrBlock< TableExprNodeRep * > &nodes, uInt starg, uInt endarg)
	Make the units of nodes from starg till endarg equal.
Private Attributes
FunctionType	funcType_p
NodeDataType	argDataType_p

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Member Enumeration Documentation

enum casa::TableExprFuncNode::FunctionType

Definition at line 78 of file ExprFuncNode.h.

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Constructor & Destructor Documentation

casa::TableExprFuncNode::TableExprFuncNode	(	FunctionType	,
		NodeDataType	,
		ValueType	,
		const TableExprNodeSet &	source
	)

Constructor.

casa::TableExprFuncNode::~TableExprFuncNode

(

)

Destructor.

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Member Function Documentation

Bool casa::TableExprFuncNode::getBool

(

const TableExprId &

id

)

[virtual]

'get' Functions to get the desired result of a function

Reimplemented from casa::TableExprNodeRep.

Double casa::TableExprFuncNode::getDouble

(

const TableExprId &

id

)

[virtual]

Reimplemented from casa::TableExprNodeRep.

DComplex casa::TableExprFuncNode::getDComplex

(

const TableExprId &

id

)

[virtual]

Reimplemented from casa::TableExprNodeRep.

String casa::TableExprFuncNode::getString

(

const TableExprId &

id

)

[virtual]

Reimplemented from casa::TableExprNodeRep.

Regex casa::TableExprFuncNode::getRegex

(

const TableExprId &

id

)

[virtual]

Reimplemented from casa::TableExprNodeRep.

MVTime casa::TableExprFuncNode::getDate

(

const TableExprId &

id

)

[virtual]

Reimplemented from casa::TableExprNodeRep.

static NodeDataType casa::TableExprFuncNode::checkOperands	(	Block< Int > &	dtypeOper,
		ValueType &	resVT,
		Block< Int > &	vtypeOper,
		FunctionType	,
		PtrBlock< TableExprNodeRep * > &
	)			[static]

Check the data and value types of the operands.

It sets the exptected data and value types of the operands. Set the value type of the function result and returns the data type of the function result.

static void casa::TableExprFuncNode::fillUnits	(	TableExprNodeRep *	node,
		PtrBlock< TableExprNodeRep * > &	nodes,
		FunctionType	func
	)			[static]

Fill the result unit in the node.

Adapt the children nodes if their units need to be converted.

static TableExprNodeRep* casa::TableExprFuncNode::fillNode	(	TableExprFuncNode *	thisNode,
		PtrBlock< TableExprNodeRep * > &	nodes,
		const Block< Int > &	dtypeOper
	)			[static]

Link the children to the node and convert the children to constants if possible.

Also convert the node to constant if possible.

static void casa::TableExprFuncNode::fillChildNodes	(	TableExprFuncNode *	thisNode,
		PtrBlock< TableExprNodeRep * > &	nodes,
		const Block< Int > &	dtypeOper
	)			[static]

Link the children to the node and convert the children to constants if possible.

static void casa::TableExprFuncNode::fillUnit	(	TableExprNodeRep &	node,
		FunctionType	func
	)			[static]

Fill the unit of the node for the functions with a predefined unit (like asin).

PtrBlock<TableExprNodeRep*> casa::TableExprFuncNode::operands

(

)

[inline]

Some functions to be used by TableExprNodeFuncArray.

Definition at line 269 of file ExprFuncNode.h.

References casa::TableExprNodeMulti::operands_p.

Referenced by casa::TableExprFuncNodeArray::operands().

FunctionType casa::TableExprFuncNode::funcType

(

)

const [inline]

Definition at line 271 of file ExprFuncNode.h.

References funcType_p.

Referenced by casa::TableExprFuncNodeArray::funcType().

NodeDataType casa::TableExprFuncNode::argDataType

(

)

const [inline]

Definition at line 273 of file ExprFuncNode.h.

References argDataType_p.

Referenced by casa::TableExprFuncNodeArray::argDataType().

void casa::TableExprFuncNode::tryToConst

(

)

[private]

Try if the function gives a constant result.

If so, set the expression type to Constant.

static const Unit& casa::TableExprFuncNode::makeEqualUnits	(	PtrBlock< TableExprNodeRep * > &	nodes,
		uInt	starg,
		uInt	endarg
	)			[static, private]

Make the units of nodes from starg till endarg equal.

Return the unit found.

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Member Data Documentation

FunctionType casa::TableExprFuncNode::funcType_p [private]

Definition at line 288 of file ExprFuncNode.h.

Referenced by funcType().

NodeDataType casa::TableExprFuncNode::argDataType_p [private]

Definition at line 289 of file ExprFuncNode.h.

Referenced by argDataType().

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

• tables/implement/Tables/ExprFuncNode.h

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