FunctCoverExpression Class Reference

Represents XQuery non-standard function fn:cover. More...

#include <functcoverexpression.h>

Inheritance diagram for FunctCoverExpression:

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Collaboration diagram for FunctCoverExpression:

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List of all members.

Public Member Functions
	FunctCoverExpression (AggregateFunctExpression *_aggfunct)
	Constructor.
virtual	~FunctCoverExpression ()
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)

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Detailed Description

Represents XQuery non-standard function fn:cover.

Represents XQuery non-standard function fn:cover, which takes a AggregateFunctExpression, e.g. fn:cover(fn:count($x/bib/book)) or fn:cover(fn:sum(/bib//book)), as argument and returns the cover 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 functcoverexpression.h.

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Constructor & Destructor Documentation

FunctCoverExpression::FunctCoverExpression

(

AggregateFunctExpression *

_aggfunct

)

Constructor.

Constructor - creating object for a AggregateFunctExpression.

Parameters:

[in]

_aggfunct

Pointer to a AggregateFunctExpression object.

Definition at line 37 of file functcoverexpression.cpp.

FunctCoverExpression::~FunctCoverExpression

(

)

[virtual]

Destructor.

Definition at line 41 of file functcoverexpression.cpp.

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Member Function Documentation

long double FunctCoverExpression::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 93 of file functcoverexpression.cpp.

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

Referenced by eval().

void FunctCoverExpression::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 functcoverexpression.cpp.

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