DigitalSpaces::DataResourceStreambuf Class Reference
[DataResources]

#include <ContainerImplementations.h>

Inherits std::streambuf.

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Detailed Description

Provides a buffer between DIDataResource and the DataResourceIStream.

A std::vector<char> is used for internal buffering. A chunk size is specified that is how much data should be pulled through the DIDataResource at one time.

You should not use this class directly, instead use DataResourceIStream.

Note:

Due to the private constructor, you will not be able to use this directly.

Protected Member Functions
void	ChangeDataResource (DIDataResource *pDataResource)
	Function that changes the data source.
void	RefreshBuffer ()
	Function that fills m_localBuffer with data from m_pDataResource.
Overridden functions from std::streambuf
int	uflow ()
int	underflow ()
std::streambuf::pos_type	seekoff (std::streambuf::off_type off, std::ios_base::seekdir way, std::ios_base::openmode which)
std::streambuf::pos_type	seekpos (std::streambuf::pos_type sp, std::ios_base::openmode which)
Protected Attributes
DIDataResource *	m_pDataResource
	The data source.
std::vector< char >	m_localBuffer
	Storage buffer for data extracted from m_pDataResource.
const unsigned int	m_bufferChunkSize
	Size of m_localBuffer.
Private Member Functions
	DataResourceStreambuf (DIDataResource *pDataResource, unsigned int bufferChunkSize)
	Constructor used by DataResourceIStream.
Friends
class	DataResourceIStream

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Constructor & Destructor Documentation

DigitalSpaces::DataResourceStreambuf::DataResourceStreambuf	(	DIDataResource *	pDataResource,
		unsigned int	bufferChunkSize
	)			[private]

Constructor used by DataResourceIStream.

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Member Function Documentation

int DigitalSpaces::DataResourceStreambuf::uflow

(

)

[protected]

int DigitalSpaces::DataResourceStreambuf::underflow

(

)

[protected]

std::streambuf::pos_type DigitalSpaces::DataResourceStreambuf::seekoff	(	std::streambuf::off_type	off,
		std::ios_base::seekdir	way,
		std::ios_base::openmode	which
	)			[protected]

std::streambuf::pos_type DigitalSpaces::DataResourceStreambuf::seekpos	(	std::streambuf::pos_type	sp,
		std::ios_base::openmode	which
	)			[protected]

void DigitalSpaces::DataResourceStreambuf::ChangeDataResource

(

DIDataResource *

pDataResource

)

[protected]

Function that changes the data source.

Note:

I see no usage of this in the implementation, not sure how the std::streambuf implementation would accept this. Probably just see the data in the new DIDataResource as a continuation of the old DIDataResource.

void DigitalSpaces::DataResourceStreambuf::RefreshBuffer

(

)

[protected]

Function that fills m_localBuffer with data from m_pDataResource.

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Friends And Related Function Documentation

friend class DataResourceIStream [friend]

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Field Documentation

DIDataResource* DigitalSpaces::DataResourceStreambuf::m_pDataResource [protected]

The data source.

std::vector<char> DigitalSpaces::DataResourceStreambuf::m_localBuffer [protected]

Storage buffer for data extracted from m_pDataResource.

Note:

This may be better as a boost::array, since we never use it as a vector anyway. May be better to malloc some memory, its not ever used in any other manner.

const unsigned int DigitalSpaces::DataResourceStreambuf::m_bufferChunkSize [protected]

Size of m_localBuffer.

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

• ContainerImplementations/ContainerImplementations.h