Reads data from storage, averaging over the raw samples. More...

#include <AverageReader.h>

Inheritance diagram for AverageReader:

Public Member Functions
	AverageReader (Index &index, double delta)
	Create a reader for an index. More...

const RawValue::Data *	find (const std::string &channel_name, const epicsTime *start)
	Returns sample of the specified channel.

const std::string &	getName () const
	Returns the channel name.

const RawValue::Data *	next ()
	Returns the next sample.

const RawValue::Data *	get () const
	Returns the present sample.

DbrType	getType () const
	Return the value type.

DbrCount	getCount () const
	Returns the count of the sample value.

const CtrlInfo &	getInfo () const
	Returns CtrlInfo.

bool	changedType ()
	Checks if type changed.

bool	changedInfo ()
	Checks if CtrlInfo changed.

bool	isRaw () const

double	getMinimum () const

double	getMaximum () const

Public Member Functions inherited from DataReader
virtual const RawValue::Data *	find (const stdString &channel_name, const epicsTime *start)=0
	Locate data. More...

void	toString (stdString &text) const
	Convert current value to string. More...

Detailed Description

Reads data from storage, averaging over the raw samples.

The AverageReader is an implementaion of a DataReader that returns the average value of the raw values within each 'bin' of 'delta' seconds on the time axis.

Assume the averaging delta is 10.0 seconds. In order to get nice-looking time stamps like 01:30:00, 01:30:10, 01:30:10, ..., the averaging reader creates bins ending at 01:30:05, 01:30:15, 01:30:15, ....

The averaged data from 01:30:05 to just before 01:30:15 is then time-stamped 01:30:10. In addition, the minimum and maximum value for the bin is available.

On the other hand, if a bin only contains a single value, that original value is returned. And if the bin contains special values like "Archive Off", that special value is returned.

Constructor & Destructor Documentation

AverageReader::AverageReader	(	Index &	index,
		double	delta
	)

Create a reader for an index.

Parameters

index	index file
delta	The averaging time interval in seconds.

Member Function Documentation

double AverageReader::getMaximum ( ) const

inline

Returns: minimum value in the current bin (if isRaw).

See Also: isRaw()

double AverageReader::getMinimum ( ) const

inline

Returns: minimum value in the current bin (if isRaw).

See Also: isRaw()

bool AverageReader::isRaw ( ) const

inline

Returns: true if the current value is a raw sample without min/max info

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

/home/malitsky/projects/epics-archiver/sourceforge/trunk/ea4-cpp/include/common/storage/AverageReader.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation