FunctRoundHalfToEvenExpression Class Reference

Represents XQuery standard function fn:round-half-to-even. More...

#include <functroundhalftoevenexpression.h>

Inheritance diagram for FunctRoundHalfToEvenExpression:

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Collaboration diagram for FunctRoundHalfToEvenExpression:

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List of all members.

Public Member Functions
	FunctRoundHalfToEvenExpression (AggregateFunctExpression *_aggfunct)
	Constructor.
virtual	~FunctRoundHalfToEvenExpression ()
virtual void	eval (OutputStream &eos, Environment *env, unsigned modus)
Private Member Functions
virtual long double	calculateValue (OutputStream &eos, Environment *env, unsigned modus, bool &non_value)

---

Detailed Description

Represents XQuery standard function fn:round-half-to-even.

Represents XQuery standard function fn:round-half-to-even, which takes a AggregateFunctExpression, e.g. fn:round-half-to-even(fn:count($x/bib/book)) or fn:round-half-to-even(fn:sum(/bib//book)), as argument and returns the round half to even result of the entered AggregateFunctExpression.

Author:

Michael Schmidt

Gunnar Jehl

Version:

2.1

License:

Software License Agreement (BSD License)

Definition at line 61 of file functroundhalftoevenexpression.h.

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Constructor & Destructor Documentation

FunctRoundHalfToEvenExpression::FunctRoundHalfToEvenExpression

(

AggregateFunctExpression *

_aggfunct

)

Constructor.

Constructor - creating object for a AggregateFunctExpression.

Parameters:

[in]

_aggfunct

Pointer to a AggregateFunctExpression object.

Definition at line 37 of file functroundhalftoevenexpression.cpp.

FunctRoundHalfToEvenExpression::~FunctRoundHalfToEvenExpression

(

)

[virtual]

Destructor.

Definition at line 41 of file functroundhalftoevenexpression.cpp.

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Member Function Documentation

long double FunctRoundHalfToEvenExpression::calculateValue	(	OutputStream &	eos,
		Environment *	env,
		unsigned	modus,
		bool &	non_value
	)			[private, virtual]

Result calculation of the corresponding rounding function.

Result calculation of the corresponding rounding function.

Parameters:

[in]	eos	Pointer to a OutputStream object.
[in]	env	Pointer to a Environment object.
[in]	modus	Evaluation modus.
[in]	non_value	Indicator if rounding function is called on an non value, i.e. is called on an empty sequence of the corresponding aggregate function.

Return values:

long

double Result of the corresponding rounding function.

Implements RoundingExpression.

Definition at line 95 of file functroundhalftoevenexpression.cpp.

References RoundingExpression::aggfunct, AggregateFunctExpression::getNextValue(), Value::getNumVal(), MiscFunctions::getRoundFrom(), Value::getType(), AggregateFunctExpression::prepareOperand(), and AggregateFunctExpression::unprepareOperand().

Referenced by eval().

void FunctRoundHalfToEvenExpression::eval	(	OutputStream &	eos,
		Environment *	env,
		unsigned	modus
	)			[virtual]

Evaluates the expression in the given environment.

Evaluates the expression in the given environment. The evaluation takes place in the environment that is passed to this method. In addition, the parameter modus is one of the following: EVAL_QUERY, EVAL_QUERY_SILENT or EVAL_SIGNOFF (see also the corresponding defines for more information). This method implements the XQuery semantics for the standard expression types, but also the GCX specific extensions like signOff-statements.

Parameters:

[in]	eos	Pointer to a OutputStream object.
[in]	env	Pointer to an Environment object.
[in]	modus	The query evaluation mode.

Exceptions:

RuntimeException

If illegal evaluation mode.

Implements RoundingExpression.

Definition at line 44 of file functroundhalftoevenexpression.cpp.

References calculateValue(), OperandExpression::cur_val, EVAL_QUERY, EVAL_QUERY_SILENT, EVAL_SIGNOFF, MiscFunctions::getStringFromNumerical(), OUTPUT_ROUNDHALFTOEVEN_ON_NON_VALUE, Value::setNumVal(), and Value::setStrVal().