NumericConstExpression Class Reference

Represents an XQuery numeric value. More...

#include <numericconstexpression.h>

Inheritance diagram for NumericConstExpression:

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Collaboration diagram for NumericConstExpression:

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List of all members.

Public Member Functions
	NumericConstExpression (const char *_num)
	Constructor.
virtual	~NumericConstExpression ()
void	print (OutputStream &dos) const
void	eval (OutputStream &eos, Environment *env, unsigned modus)
virtual Value *	getNextValue ()
Private Attributes
long double	num
	The entered numeric value.

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Detailed Description

Represents an XQuery numeric value.

Represents an XQuery numeric value, e.g. 3, which takes therefore a numeric value as argument and returns this (numeric) value.

Author:

Michael Schmidt

Gunnar Jehl

Version:

2.1

License:

Software License Agreement (BSD License)

Definition at line 49 of file numericconstexpression.h.

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Constructor & Destructor Documentation

NumericConstExpression::NumericConstExpression

(

const char *

_num

)

Constructor.

Constructor - creating object for a string (numeric value), which will be casted to a numeric value.

Parameters:

[in]

_num

Pointer to a char object.

Definition at line 38 of file numericconstexpression.cpp.

NumericConstExpression::~NumericConstExpression

(

)

[virtual]

Destructor.

Definition at line 43 of file numericconstexpression.cpp.

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Member Function Documentation

void NumericConstExpression::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 ConstExpression.

Definition at line 50 of file numericconstexpression.cpp.

References EVAL_QUERY, EVAL_SIGNOFF, and num.

Value * NumericConstExpression::getNextValue

(

)

[virtual]

Returns the next value of the operand.

Returns the next value of the operand for iteration.

Return values:

Value*

Pointer to a Value object.

Implements ConstExpression.

Definition at line 71 of file numericconstexpression.cpp.

References OperandExpression::cur_val, OperandExpression::initial, num, and Value::setNumVal().

void NumericConstExpression::print

(

OutputStream &

dos

)

const [virtual]

Prints the expression.

Prints the expression.

Parameters:

[in]

dos

Pointer to a OutputStream object.

Return values:

void

Implements Expression.

Definition at line 46 of file numericconstexpression.cpp.

References num.

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Member Data Documentation

long double NumericConstExpression::num [private]

The entered numeric value.

The entered numeric value, which was (after casting) the argument of the constructor.

Definition at line 85 of file numericconstexpression.h.

Referenced by eval(), getNextValue(), and print().