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

typedef custom_error< error_codeerror
 Exception type.
 DIR_OPEN
 Failed to open directory.
 DIR_READ
 Failed to read directory.
enum  error_code { DIR_OPEN, DIR_READ }
 Error codes. More...

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

typedef custom_error<error_code> sbuild::dirstream::error

Exception type.


Member Enumeration Documentation

enum sbuild::dirstream::error_code

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.

dirstream::~dirstream (  )  [virtual]

The destructor.


Member Function Documentation

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.

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()

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.

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()

sbuild::dirstream::operator bool (  ) 

Check if the dirstream status is good.

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

bool sbuild::dirstream::operator! (  ) 

Check if the dirstream status is bad.

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

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.


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

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

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

The underlying DIR stream.

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

The directory name.

bool sbuild::dirstream::eof_status [private]

End of File status.

bool sbuild::dirstream::error_status [private]

Error status.


The documentation for this class was generated from the following files:
Generated on Mon Sep 11 23:18:55 2006 for schroot by  doxygen 1.4.7