saga::filesystem::file Class Reference

The SAGA file package file API. More...

#include <file.hpp>

Inheritance diagram for saga::filesystem::file:

List of all members.

Public Member Functions
	file (session const &s, saga::url url, int mode=Read)
	Creates the object.
	file (saga::url url, int mode=Read)
	Creates the object.
	file (saga::object const &o)
	Creates the object.
	file (void)
	Creates the object.
	~file (void)
	Destroys the object.
file &	operator= (saga::object const &o)
	Brief description starts here.
saga::off_t	get_size (void)
	Returns the number of bytes in the file.
saga::ssize_t	read (saga::mutable_buffer buffer, saga::ssize_t length=0)
	Reads up to length bytes from the file into the buffer.
saga::ssize_t	write (saga::const_buffer buffer, saga::ssize_t length=0)
	Writes up to length bytes from buffer into the file at the current file position.
saga::off_t	seek (saga::off_t offset, seek_mode mode)
	Reposition the file pointer.
void	read_v (std::vector< saga::filesystem::iovec > buffer_vec)
	Gather/scatter read.
void	write_v (std::vector< saga::filesystem::const_iovec > buffer_vec)
	Gather/scatter write.
saga::ssize_t	size_p (std::string pattern)
	Determine the storage size required for a pattern I/O operation.
saga::ssize_t	read_p (std::string pattern, saga::mutable_buffer buffer)
	Pattern-based read.
saga::ssize_t	write_p (std::string pattern, saga::const_buffer buffer)
	Pattern-based write.
std::vector< std::string >	modes_e ()
	List the extended modes available in this implementation, and/or on server side.
saga::size_t	size_e (std::string ext_mode, std::string specification)
	determine the storage size required for an extended I/O operation
saga::ssize_t	read_e (std::string ext_mode, std::string specification, saga::mutable_buffer buffer)
	Extended read.
saga::ssize_t	write_e (std::string ext_mode, std::string specification, saga::const_buffer buffer)
	Extended write.
Static Public Member Functions
static file	create (session const &s, saga::url url, int mode=Read)
	Factory function resembling file(session, url, int) constructor.
static file	create (saga::url url, int mode=Read)
	Factory function resembling file(url, int) constructor.
template<typename Tag >
static saga::task	create (saga::url url, int mode=Read)
	Factory function resembling entry(url, int) constructor.

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Detailed Description

The SAGA file package file API.

This class represents an open file descriptor for read/write operations on a physical file. Its concept is similar to the file descriptor returned by the open (2) call in POSIX.

Example:

Definition at line 103 of file file.hpp.

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Constructor & Destructor Documentation

saga::filesystem::file::file	(	session const &	s,
		saga::url	url,
		int	mode = Read
	)

Creates the object.

Definition at line 34 of file file.cpp.

saga::filesystem::file::file	(	saga::url	url,
		int	mode = Read
	)			[explicit]

Creates the object.

Definition at line 46 of file file.cpp.

saga::filesystem::file::file

(

saga::object const &

o

)

[explicit]

Creates the object.

Definition at line 52 of file file.cpp.

References saga::BadParameter, saga::object::File, and saga::object::get_type().

saga::filesystem::file::file

(

void

)

Creates the object.

Definition at line 61 of file file.cpp.

saga::filesystem::file::~file

(

void

)

Destroys the object.

Definition at line 65 of file file.cpp.

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Member Function Documentation

static file saga::filesystem::file::create	(	session const &	s,
		saga::url	url,
		int	mode = Read
	)			[inline, static]

Factory function resembling file(session, url, int) constructor.

Reimplemented from saga::name_space::entry.

Definition at line 178 of file file.hpp.

static file saga::filesystem::file::create	(	saga::url	url,
		int	mode = Read
	)			[inline, static]

Factory function resembling file(url, int) constructor.

Reimplemented from saga::name_space::entry.

Definition at line 186 of file file.hpp.

template<typename Tag >

static saga::task saga::filesystem::file::create	(	saga::url	url,
		int	mode = Read
	)			[inline, static]

Factory function resembling entry(url, int) constructor.

Reimplemented from saga::name_space::entry.

Definition at line 191 of file file.hpp.

file & saga::filesystem::file::operator=

(

saga::object const &

o

)

Brief description starts here.

Reimplemented from saga::name_space::entry.

Definition at line 69 of file file.cpp.

saga::off_t saga::filesystem::file::get_size

(

void

)

[inline]

Returns the number of bytes in the file.

Definition at line 206 of file file.hpp.

References saga::task::get_result().

saga::ssize_t saga::filesystem::file::read	(	saga::mutable_buffer	buffer,
		saga::ssize_t	length = 0
	)			[inline]

Reads up to length bytes from the file into the buffer.

Parameters:

	length	Number of bytes to be read
	buffer	Buffer to read into

Returns:

Number of bytes successfully read

Definition at line 222 of file file.hpp.

References saga::task::get_result().

saga::ssize_t saga::filesystem::file::write	(	saga::const_buffer	buffer,
		saga::ssize_t	length = 0
	)			[inline]

Writes up to length bytes from buffer into the file at the current file position.

Parameters:

	length	Number of bytes to write
	buffer	Data to write

Returns:

Number of bytes successfully written

Definition at line 239 of file file.hpp.

References saga::task::get_result().

saga::off_t saga::filesystem::file::seek	(	saga::off_t	offset,
		seek_mode	mode
	)			[inline]

Reposition the file pointer.

Parameters:

	offset	Offset in bytes to move pointer
	mode	Offset is relative to mode

Returns:

position of pointer after seek

Definition at line 255 of file file.hpp.

References saga::task::get_result().

void saga::filesystem::file::read_v

(

std::vector< saga::filesystem::iovec >

buffer_vec

)

[inline]

Gather/scatter read.

Parameters:

buffer_vec

Array of buffer_vec structs defining start (offset) and length (length) of each individual read, buffer to read into, and integer to store result into.

Definition at line 271 of file file.hpp.

References saga::task::get_result().

void saga::filesystem::file::write_v

(

std::vector< saga::filesystem::const_iovec >

buffer_vec

)

[inline]

Gather/scatter write.

Parameters:

buffer_vec

Array of buffer_vec structs defining start (offset) and length (length) of each individual write, and buffers containing the data to write

Definition at line 286 of file file.hpp.

References saga::task::get_result().

saga::ssize_t saga::filesystem::file::size_p

(

std::string

pattern

)

[inline]

Determine the storage size required for a pattern I/O operation.

Parameters:

pattern

Pattern to determine size for

Returns:

Size required for I/O operation with that pattern

Definition at line 299 of file file.hpp.

References saga::task::get_result().

saga::ssize_t saga::filesystem::file::read_p	(	std::string	pattern,
		saga::mutable_buffer	buffer
	)			[inline]

Pattern-based read.

Parameters:

	pattern	Pattern specification for read operation
	buffer	Buffer to store read bytes into

Returns:

Number of successfully read bytes

Definition at line 314 of file file.hpp.

References saga::task::get_result().

saga::ssize_t saga::filesystem::file::write_p	(	std::string	pattern,
		saga::const_buffer	buffer
	)			[inline]

Pattern-based write.

Parameters:

	pattern	Pattern specification for read operation
	buffer	Buffer to store read bytes into

Returns:

number of bytes successfully written

Definition at line 329 of file file.hpp.

References saga::task::get_result().

std::vector<std::string> saga::filesystem::file::modes_e

(

)

[inline]

List the extended modes available in this implementation, and/or on server side.

Parameters:

ret

Pattern to determine size for

Returns:

Size required for I/O operation with that pattern

Definition at line 344 of file file.hpp.

References saga::task::get_result().

saga::size_t saga::filesystem::file::size_e	(	std::string	ext_mode,
		std::string	specification
	)			[inline]

determine the storage size required for an extended I/O operation

Definition at line 356 of file file.hpp.

References saga::task::get_result().

saga::ssize_t saga::filesystem::file::read_e	(	std::string	ext_mode,
		std::string	specification,
		saga::mutable_buffer	buffer
	)			[inline]

Extended read.

Parameters:

	ext_mode	Extended mode to use
	specification	Specification of read operation
	buffer	Buffer to store read bytes into

Returns:

Number of successfully read bytes

Definition at line 371 of file file.hpp.

References saga::task::get_result().

saga::ssize_t saga::filesystem::file::write_e	(	std::string	ext_mode,
		std::string	specification,
		saga::const_buffer	buffer
	)			[inline]

Extended write.

Parameters:

	ext_mode	Extended mode to use
	specification	Specification of write operation
	buffer	Buffer to store read bytes into

Returns:

Number of successfully read bytes

Definition at line 392 of file file.hpp.

References saga::task::get_result().

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

• file.hpp
• file.cpp