sbuild::dirstream Class Reference

Access directories. More...

#include <sbuild-dirstream.h>

Collaboration diagram for sbuild::dirstream:

Collaboration graph
[legend]

List of all members.

Public Types

enum  error_code { DIR_OPEN, DIR_READ }
 Error codes. More...
typedef custom_error< error_codeerror
 Exception type.

Public Member Functions

 dirstream (std::string const &dir)
 The constructor.
virtual ~dirstream ()
 The destructor.
void open (std::string const &dirname)
 Open a directory for reading.
void close ()
 Close the directory.
bool eof () const
 Check for End Of File.
bool bad () const
 Check for errors.
 operator bool ()
 Check if the dirstream status is good.
bool operator! ()
 Check if the dirstream status is bad.

Private Member Functions

void read (int quantity=1)
 Read dirents from the underlying DIR stream into the data deque.

Private Attributes

std::string dirname
 The directory name.
DIR * dir
 The underlying DIR stream.
std::deque< direntrydata
 A list of direntries represents the directory stream as a LIFO stack.
bool error_status
 Error status.
bool eof_status
 End of File status.

Friends

dirstreamoperator>> (dirstream &stream, direntry &entry)
 The overloaded extraction operator.


Detailed Description

Access directories.

This is a wrapper around the opendir(3), readdir(3) and closedir(3) functions, which are used to read a stream of "dirents" through multiple readdir() calls.

dirstream calls opendir() and closedir() automatically, and represents each dirent as a dirstream::direntry. Like reading from and istream by pulling data out with the >> "extraction operator", direntries are also extracted from the dirstream with the >> operator.


Member Typedef Documentation

Exception type.


Member Enumeration Documentation

Error codes.

Enumerator:
DIR_OPEN  Failed to open directory.
DIR_READ  Failed to read directory.


Constructor & Destructor Documentation

dirstream::dirstream ( std::string const &  dir  ) 

The constructor.

Parameters:
dir the directory to read.

References open().

dirstream::~dirstream (  )  [virtual]

The destructor.

References close().


Member Function Documentation

void dirstream::open ( std::string const &  dirname  ) 

Open a directory for reading.

This uses the opendir(3) call to open the underlying DIR stream. Any previously open directory is closed before opening the new one. The dirstream error state is set if the open fails, and an exception will be thrown.

Parameters:
dirname the directory to read.
See also:
close()

References dir, DIR_OPEN, eof_status, error_status, and read().

Referenced by dirstream().

void dirstream::close (  ) 

Close the directory.

This uses the closedir(3) call to close the underlying DIR stream. All cached data is deleted and the error state set until open() is called.

See also:
open()

References data, dir, dirname, eof_status, and error_status.

Referenced by ~dirstream().

bool dirstream::eof (  )  const

Check for End Of File.

Note that the end of file status is only set adter a read fails, so this should be checked after each read.

Returns:
true if the dirstream is empty, otherwise false.

References eof_status.

Referenced by operator bool(), and operator!().

bool dirstream::bad (  )  const

Check for errors.

If there is an error, the dirstream is unusable until the next open() call.

Returns:
true if the dirstream is in an error state, otherwise false.

References error_status.

Referenced by operator bool(), and operator!().

sbuild::dirstream::operator bool (  ) 

Check if the dirstream status is good.

Returns:
true if the status is good (eof() and bad() both return false).

References bad(), and eof().

bool sbuild::dirstream::operator! (  ) 

Check if the dirstream status is bad.

Returns:
true if the status is bad (eof() or bad() return true).

References bad(), and eof().

void dirstream::read ( int  quantity = 1  )  [private]

Read dirents from the underlying DIR stream into the data deque.

If the read fails, the error state will be set, and an exception will be thrown.

Parameters:
quantity the number of dirents to read.

References data, dir, DIR_READ, dirname, and error_status.

Referenced by open(), and sbuild::operator>>().


Friends And Related Function Documentation

dirstream& operator>> ( dirstream stream,
direntry entry 
) [friend]

The overloaded extraction operator.

This is used to pull direntries from a dirstream.

Parameters:
stream the dirstream to get input from.
entry the direntry to set.
Returns:
the dirstream.


Member Data Documentation

std::string sbuild::dirstream::dirname [private]

The directory name.

Referenced by close(), and read().

DIR* sbuild::dirstream::dir [private]

The underlying DIR stream.

Referenced by close(), open(), and read().

std::deque<direntry> sbuild::dirstream::data [private]

A list of direntries represents the directory stream as a LIFO stack.

Referenced by close(), sbuild::operator>>(), and read().

Error status.

Referenced by bad(), close(), open(), and read().

End of File status.

Referenced by close(), eof(), open(), and sbuild::operator>>().


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

Generated on Sat Jul 5 12:00:04 2008 for sbuild by  doxygen 1.5.6