indexing
	description: "Directories, in the Unix sense, with creation and exploration features"

class interface
	DIRECTORY

create 

	make (dn: STRING)
			-- Create directory object for the directory
			-- of name dn.
		require
			string_exists: dn /= void

	make_open_read (dn: STRING)
			-- Create directory object for the directory
			-- of name dn and open it for reading.
		require
			string_exists: dn /= void

feature -- Initialization

	create_dir
			-- Create a physical directory.
		require
			physical_not_exists: not exists

	make (dn: STRING)
			-- Create directory object for the directory
			-- of name dn.
		require
			string_exists: dn /= void

	make_open_read (dn: STRING)
			-- Create directory object for the directory
			-- of name dn and open it for reading.
		require
			string_exists: dn /= void
	
feature -- Access

	change_name (new_name: STRING)
			-- Change file name to new_name
		require
			not_new_name_void: new_name /= void;
			file_exists: exists
		ensure
			name_changed: name.is_equal (new_name)

	close
			-- Close directory.
		require
			is_open: not is_closed

	has_entry (entry_name: STRING): BOOLEAN
			-- Has directory the entry entry_name?
			-- The use of dir_temp is required not
			-- to change the position in the current
			-- directory entries list.
		require
			string_exists: entry_name /= void

	name: STRING
			-- Directory name

	open_read
			-- Open directory name for reading.

	readentry
			-- Read next directory entry;
			-- make result available in lastentry.
			-- Make result void if all entries have been read.
		require
			is_opened: not is_closed

	start
			-- Go to first entry of directory.
		require
			is_opened: not is_closed
	
feature -- Measurement

	count: INTEGER
			-- Number of entries in directory.
		require
			directory_exists: exists
	
feature -- Status report

	empty: BOOLEAN
			-- Is directory empty?
		require
			directory_exists: exists

	exists: BOOLEAN
			-- Does the directory exist?

	is_closed: BOOLEAN
			-- Is current directory closed?

	is_executable: BOOLEAN
			-- Is the directory executable?
		require
			directory_exists: exists

	is_readable: BOOLEAN
			-- Is the directory readable?
		require
			directory_exists: exists

	is_writable: BOOLEAN
			-- Is the directory writable?
		require
			directory_exists: exists

	lastentry: STRING
			-- Last entry read by readentry
	
feature -- Removal

	delete
			-- Delete directory if empty
		require
			directory_exists: exists;
			empty_directory: empty

	dispose
			-- Ensure this medium is closed when garbage collected.
	
feature -- Conversion

	linear_representation: ARRAYED_LIST [STRING]
			-- The entries, in sequential format.
	
end -- class DIRECTORY