iolink::RandomAccessFactory Class Reference

A factory to create RandomAccess instances from various ressources. More...

#include <iolink/storage/RandomAccessFactory.h>

Public Member Functions
	RandomAccessFactory (const RandomAccessFactory &other)=delete
	RandomAccessFactory (RandomAccessFactory &&other)=delete
RandomAccessFactory &	operator= (const RandomAccessFactory &other)=delete
RandomAccessFactory &	operator= (RandomAccessFactory &&other)=delete

Static Public Member Functions
static std::shared_ptr< RandomAccess >	allocate (size_t size)
	Create an in-memory RandomAccess of given size.
static std::shared_ptr< RandomAccess >	copyInMemory (std::shared_ptr< RandomAccess > randomAccess)
	Load given RandomAccess in memory. More...
static std::shared_ptr< RandomAccess >	mapFile (const std::string &filePath)
	Get an accessor from a file mapped in memory. More...
static std::shared_ptr< RandomAccess >	fromBuffer (void *buffer, size_t size)
	Create a RandomAccess from given memory area. More...
static std::shared_ptr< RandomAccess >	openURIRead (const Uri &uri)
	Create a RandomAccess from given URI, opening URI in Read Only. More...
static std::shared_ptr< RandomAccess >	openHTTPRead (const Uri &uri, const std::string &method, const HTTPHeaders &headers)
	Create a RandomAccess from given HTTP URI, opening URI in Read Only. More...
static std::shared_ptr< RandomAccess >	extractRegion (std::shared_ptr< RandomAccess > src, size_t offset)
	Creates an accessor to a subset of a RandomAccess. More...
static std::shared_ptr< RandomAccess >	extractRegion (std::shared_ptr< RandomAccess > src, size_t offset, size_t size)
	Creates an accessor to a subset of a RandomAccess. More...
static std::shared_ptr< RandomAccess >	fromStream (std::shared_ptr< StreamAccess > stream)
	Create a RandomAccess that will delegate to a StreamAccess. More...

Detailed Description

A factory to create RandomAccess instances from various ressources.

Member Function Documentation

copyInMemory()

static std::shared_ptr<RandomAccess> iolink::RandomAccessFactory::copyInMemory ( std::shared_ptr< RandomAccess >  randomAccess )

static

Load given RandomAccess in memory.

If storage is already an in-memory RandomAccess, return it (no copy are done).

Exceptions

InvalidArgument

if input randomAccess is null

extractRegion() [1/2]

static std::shared_ptr<RandomAccess> iolink::RandomAccessFactory::extractRegion ( std::shared_ptr< RandomAccess >  src, size_t  offset  )

static

Creates an accessor to a subset of a RandomAccess.

Parameters

src	The accessor to create the subset from
offset	The offset from the start of the source accessor

Exceptions

InvalidArgument	if input randomAccess is null
Error	When offset is out of range.

extractRegion() [2/2]

static std::shared_ptr<RandomAccess> iolink::RandomAccessFactory::extractRegion ( std::shared_ptr< RandomAccess >  src, size_t  offset, size_t  size  )

static

Creates an accessor to a subset of a RandomAccess.

Parameters

src	The accessor to create the subset from
offset	The offset from the start of the source accessor
size	The size of the subset.

Exceptions

InvalidArgument	if input randomAccess is null
Error	When the subset range is out of the source accessor range.

fromBuffer()

static std::shared_ptr<RandomAccess> iolink::RandomAccessFactory::fromBuffer ( void *  buffer, size_t  size  )

static

Create a RandomAccess from given memory area.

Warning

The return DataAccess does not have the ownership of given buffer. You must carefully manage lifetime of each objects.

fromStream()

static std::shared_ptr<RandomAccess> iolink::RandomAccessFactory::fromStream ( std::shared_ptr< StreamAccess >  stream )

static

Create a RandomAccess that will delegate to a StreamAccess.

Exceptions

InvalidArgument

if input stream is null

mapFile()

static std::shared_ptr<RandomAccess> iolink::RandomAccessFactory::mapFile ( const std::string &  filePath )

static

Get an accessor from a file mapped in memory.

Parameters

filePath

The path to the file to map.

Returns

A RandomAccess with read and write capabilities.

Exceptions

Error

If the file does not exist already

openHTTPRead()

static std::shared_ptr<RandomAccess> iolink::RandomAccessFactory::openHTTPRead ( const Uri &  uri, const std::string &  method, const HTTPHeaders &  headers  )

static

Create a RandomAccess from given HTTP URI, opening URI in Read Only.

Requested HTTP server must support HTTP range requests.

Parameters

uri	The HTTP(S) URI to get.
method	The HTTP request method.
headers	The HTTP request headers.

openURIRead()

static std::shared_ptr<RandomAccess> iolink::RandomAccessFactory::openURIRead ( const Uri &  uri )

static

Create a RandomAccess from given URI, opening URI in Read Only.

If the URI scheme is 'file': creates a ReadRandomAccess using StreamAccessFactory::openFileRead(). If the URI scheme is 'http(s)': calls openHTTPRead(), using the GET method and no headers.

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

• iolink/public/include/iolink/storage/RandomAccessFactory.h