FunctTruncateExpression Class Reference

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

#include <functtruncateexpression.h>

Inheritance diagram for FunctTruncateExpression:

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Collaboration diagram for FunctTruncateExpression:

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List of all members.

Public Member Functions
	FunctTruncateExpression (AggregateFunctExpression *_aggfunct)
	Constructor.
virtual	~FunctTruncateExpression ()
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:truncate.

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

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Constructor & Destructor Documentation

FunctTruncateExpression::FunctTruncateExpression

(

AggregateFunctExpression *

_aggfunct

)

Constructor.

Constructor - creating object for a AggregateFunctExpression.

Parameters:

[in]

_aggfunct

Pointer to a AggregateFunctExpression object.

Definition at line 37 of file functtruncateexpression.cpp.

FunctTruncateExpression::~FunctTruncateExpression

(

)

[virtual]

Destructor.

Definition at line 41 of file functtruncateexpression.cpp.

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Member Function Documentation

long double FunctTruncateExpression::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 94 of file functtruncateexpression.cpp.

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

Referenced by eval().

void FunctTruncateExpression::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 functtruncateexpression.cpp.

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