iolink::RandomAccess Class Reference

Interface representing a generic array-like accessor. More...

#include <iolink/storage/RandomAccess.h>

Inheritance diagram for iolink::RandomAccess:

Public Member Functions
virtual RandomAccessCapabilitySet	capabilities () const =0
bool	support (RandomAccessCapabilitySet flags)
	Checks if the RandomAccess supports the given capabilities.
virtual size_t	size () const =0
	Return the number of bytes of the resource accessed.
std::string	toString () const
	Return a string representation.
virtual size_t	read (size_t offset, size_t size, void *dst)
	Read content of data into given buffer. More...
virtual size_t	write (size_t offset, size_t size, const void *src)
	Write content of src buffer into data. More...
virtual void	resize (size_t newSize)
	Resize content data. More...
virtual void *	buffer ()
	Return a mutable pointer to the internal memory buffer. More...
virtual const void *	bufferReadOnly () const
	Return an immutable pointer to the internal memory buffer. More...
virtual size_t	bufferSize ()
	Size in bytes of the internal buffer. More...
Public Member Functions inherited from iolink::DataAccess
virtual std::shared_ptr< DataStorage >	storage () const =0
	Get the storage to which this data accessor belong.
virtual const std::string &	resourceId () const =0
	Return the resource identifier of this data accessor.

Detailed Description

Interface representing a generic array-like accessor.

This interface capabilities are indicated by the RandomAccessCapabilitySet returned by the method RandomAccess::capabilities. Each capability enables the use of a specific set of methods. When one of those methods is called, if its corresponding capability is not supported, a NotImplemented exception will be thrown.

See also

RandomAccessCapability for capabilities managed by this object

Member Function Documentation

buffer()

virtual void* iolink::RandomAccess::buffer ( )

virtual

Return a mutable pointer to the internal memory buffer.

Available when the RandomAccess has the MEMORY_ACCESS capability.

Exceptions

NotImplemented

If the implementation does not support memory access.

bufferReadOnly()

virtual const void* iolink::RandomAccess::bufferReadOnly ( ) const

virtual

Return an immutable pointer to the internal memory buffer.

Available when the RandomAccess has the MEMORY_ACCESS capability.

Exceptions

NotImplemented

If the implementation does not support memory access.

bufferSize()

virtual size_t iolink::RandomAccess::bufferSize ( )

virtual

Size in bytes of the internal buffer.

Available when the RandomAccess has the MEMORY_ACCESS capability.

Exceptions

NotImplemented

If the implementation does not support memory access.

capabilities()

virtual RandomAccessCapabilitySet iolink::RandomAccess::capabilities ( ) const

pure virtual

Returns

capabilities for current RandomAccess

read()

virtual size_t iolink::RandomAccess::read ( size_t  offset, size_t  size, void *  dst  )

virtual

Read content of data into given buffer.

Available when the RandomAccess has the READ capability.

Parameters

offset	Offset in byte to the begining of read area
size	Size in byte of read area
dst	Destination buffer. This buffer should have a size of "size"

Exceptions

exception

if offset is out of range

Returns

Count of actually read bytes (can be zero or less than given size).

resize()

virtual void iolink::RandomAccess::resize ( size_t  newSize )

virtual

Resize content data.

Available when the RandomAccess has the RESIZE capability.

Parameters

newSize

New size of data. Content of data is undefined after being resized.

write()

virtual size_t iolink::RandomAccess::write ( size_t  offset, size_t  size, const void *  src  )

virtual

Write content of src buffer into data.

Available when the RandomAccess has the WRITE capability.

Parameters

offset	Offset in byte to the beginning of write area
size	Size in byte of write area
src	Source buffer. This buffer should have a size of "size"

Exceptions

exception

if offset is out of range

Returns

Count of actually written bytes (can be zero or less than given size).

---

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

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