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	description: "Any medium that can perform input and/or output"
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

deferred class 
	IO_MEDIUM

feature -- Access

	name: STRING is
			-- Medium name
		deferred
		end

	retrieved: ANY is
			-- Retrieved object structure
			-- To access resulting object under correct type,
			-- use assignment attempt.
			-- Will raise an exception (code Retrieve_exception)
			-- if content is not a stored Eiffel structure.
		require
			exists: exists
			is_open_read: is_open_read
			support_storable: support_storable
		deferred
		ensure
			result_exists: Result /= void
		end
	
feature {NONE} -- Access

	C_memory: INTEGER is 2
			-- Code for the C memory managed
			-- by the garbage collector
			-- (from MEM_CONST)

	Eiffel_memory: INTEGER is 1
			-- Code for the Eiffel memory managed
			-- by the garbage collector
			-- (from MEM_CONST)

	Full_collector: INTEGER is 0
			-- Statistics for full collections
			-- (from MEM_CONST)

	Incremental_collector: INTEGER is 1
			-- Statistics for incremental collections
			-- (from MEM_CONST)

	Total_memory: INTEGER is 0
			-- Code for all the memory managed
			-- by the garbage collector
			-- (from MEM_CONST)
	
feature {NONE} -- Measurement

	gc_statistics (collector_type: INTEGER): GC_INFO is
			-- Garbage collection information for collector_type.
			-- (from MEMORY)
		require -- from MEMORY
			type_ok: collector_type = full_collector or collector_type = incremental_collector
		do
			create Result.make (collector_type)
		end

	memory_statistics (memory_type: INTEGER): MEM_INFO is
			-- Memory usage information for memory_type
			-- (from MEMORY)
		require -- from MEMORY
			type_ok: memory_type = total_memory or memory_type = eiffel_memory or memory_type = c_memory
		do
			create Result.make (memory_type)
		end
	
feature -- Status report

	exists: BOOLEAN is
			-- Does medium exist?
		deferred
		end

	extendible: BOOLEAN is
			-- May new items be added?
		deferred
		end

	handle: INTEGER is
			-- Handle to medium
		require
			valid_handle: handle_available
		deferred
		end

	handle_available: BOOLEAN is
			-- Is the handle available after class has been
			-- created?
		deferred
		end

	is_closed: BOOLEAN is
			-- Is the I/O medium open
		deferred
		end

	is_executable: BOOLEAN is
			-- Is medium executable?
		require
			handle_exists: exists
		deferred
		end

	is_open_read: BOOLEAN is
			-- Is this medium opened for input
		deferred
		end

	is_open_write: BOOLEAN is
			-- Is this medium opened for output
		deferred
		end

	is_plain_text: BOOLEAN is
			-- Is file reserved for text (character sequences)?
		do
		end

	is_readable: BOOLEAN is
			-- Is medium readable?
		require
			handle_exists: exists
		deferred
		end

	is_writable: BOOLEAN is
			-- Is medium writable?
		require
			handle_exists: exists
		deferred
		end

	last_character: CHARACTER
			-- Last character read by read_character

	last_double: DOUBLE
			-- Last double read by read_double

	last_integer: INTEGER
			-- Last integer read by read_integer

	last_real: REAL
			-- Last real read by read_real

	last_string: STRING
			-- Last string read

	readable: BOOLEAN is
			-- Is there a current item that may be read?
		require
			handle_exists: exists
		deferred
		end

	support_storable: BOOLEAN is
			-- Can medium be used to store an Eiffel object?
		deferred
		end
	
feature {NONE} -- Status report

	chunk_size: INTEGER is
			-- Minimal size of a memory chunk. The run-time always
			-- allocates a multiple of this size.
			-- If the environment variable EIF_MEMORY_CHUNK
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_get_chunk_size"
		end

	coalesce_period: INTEGER is
			-- Period of full coalesce (in number of collections)
			-- If the environment variable EIF_FULL_COALESCE_PERIOD
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- If null, no full coalescing is launched.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_coalesce_period"
		end

	collecting: BOOLEAN is
			-- Is garbage collection enabled?
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"gc_ison"
		end

	collection_period: INTEGER is
			-- Period of full collection.
			-- If the environment variable EIF_FULL_COLLECTION_PERIOD
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- If null, no full collection is launched.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_pget"
		end

	generation_object_limit: INTEGER is
			-- Maximum size of object in generational scavenge zone.
			-- If the environment variable EIF_GS_LIMIT
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_generation_object_limit"
		end

	largest_coalesced_block: INTEGER is
			-- Size of largest coalesced block since last call to
			-- largest_coalesced; 0 if none.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_largest"
		end

	max_mem: INTEGER is
			-- Maximum amount of bytes the run-time can allocate.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_get_max_mem"
		end

	memory_threshold: INTEGER is
			-- Minimum amount of bytes to be allocated before
			-- starting an automatic garbage collection.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_tget"
		end

	referers (an_object: ANY): ARRAY [ANY] is
			-- Objects that refer to an_object.
			-- (from MEMORY)
		local
			a: ANY
		do
			create Result.make (0, 200)
			a := Result.area
			find_referers ($an_object, $a, Result.count)
		end

	scavenge_zone_size: INTEGER is
			-- Size of generational scavenge zone.
			-- If the environment variable EIF_MEMORY_SCAVENGE
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_scavenge_zone_size"
		end

	tenure: INTEGER is
			-- Maximum age of object before being considered
			-- as old (old objects are not scanned during
			-- partial collection).
			-- If the environment variable EIF_TENURE_MAX
			-- is defined, it is set to the closest reasonable
			-- value from it.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"eif_tenure"
		end
	
feature -- Status setting

	close is
			-- Close medium.
		require
			medium_is_open: not is_closed
		deferred
		end
	
feature {NONE} -- Status setting

	allocate_compact is
			-- Enter `memory' mode: will try to compact memory
			-- before requesting more from the operating system.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_slow"
		end

	allocate_fast is
			-- Enter `speed' mode: will optimize speed of memory
			-- allocation rather than memory usage.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_speed"
		end

	allocate_tiny is
			-- Enter `tiny' mode: will enter `memory' mode
			-- after having freed as much memory as possible.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_tiny"
		end

	collection_off is
			-- Disable garbage collection.
			-- (from MEMORY)
		external
			"C | %"eif_garcol.h%""
		alias
			"gc_stop"
		end

	collection_on is
			-- Enable garbage collection.
			-- (from MEMORY)
		external
			"C | %"eif_garcol.h%""
		alias
			"gc_run"
		end

	disable_time_accounting is
			-- Disable GC time accounting (default).
			-- (from MEMORY)
		do
			gc_monitoring (False)
		end

	enable_time_accounting is
			-- Enable GC time accouting, accessible in gc_statistics.
			-- (from MEMORY)
		do
			gc_monitoring (True)
		end

	set_coalesce_period (value: INTEGER) is
			-- Set coalesce_period. Every value collection,
			-- the Garbage Collector will coalesce
			-- the whole memory.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value >= 0
		external
			"C | %"eif_memory.h%""
		alias
			"eif_set_coalesce_period"
		end

	set_collection_period (value: INTEGER) is
			-- Set collection_period. Every value collection,
			-- the Garbage collector will perform a collection
			-- on the whole memory (full collection), otherwise
			-- a simple partial collection is done.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value >= 0
		external
			"C | %"eif_memory.h%""
		alias
			"mem_pset"
		end

	set_max_mem (value: INTEGER) is
			-- Set the maximum amount of memory the run-time can allocate.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value > 0
		external
			"C | %"eif_memory.h%""
		alias
			"eif_set_max_mem"
		end

	set_memory_threshold (value: INTEGER) is
			-- Set a new memory_threshold in bytes. Whenever the memory
			-- allocated for Eiffel reaches this value, an automatic
			-- collection is performed.
			-- (from MEMORY)
		require -- from MEMORY
			positive_value: value > 0
		external
			"C | %"eif_memory.h%""
		alias
			"mem_tset"
		end
	
feature -- Element change

	basic_store (object: ANY) is
			-- Produce an external representation of the
			-- entire object structure reachable from object.
			-- Retrievable within current system only.
		require
			object_not_void: object /= void
			exists: exists
			is_open_write: is_open_write
			support_storable: support_storable
		deferred
		end

	general_store (object: ANY) is
			-- Produce an external representation of the
			-- entire object structure reachable from object.
			-- Retrievable from other systems for same platform
			-- (machine architecture).
		require
			object_not_void: object /= void
			exists: exists
			is_open_write: is_open_write
			support_storable: support_storable
		deferred
		end

	independent_store (object: ANY) is
			-- Produce an external representation of the
			-- entire object structure reachable from object.
			-- Retrievable from other systems for the same or other
			-- platform (machine architecture).
		require
			object_not_void: object /= void
			exists: exists
			is_open_write: is_open_write
			support_storable: support_storable
		deferred
		end
	
feature -- Removal

	dispose is
			-- Ensure this medium is closed when garbage collected.
		do
			if not is_closed then
				close
			end
		end
	
feature {NONE} -- Removal

	collect is
			-- Force a partial collection cycle if garbage
			-- collection is enabled; do nothing otherwise.
			-- (from MEMORY)
		external
			"C | %"eif_eiffel.h%""
		end

	free (object: ANY) is
			-- Free object, by-passing garbage collection.
			-- Erratic behavior will result if the object is still
			-- referenced.
			-- (from MEMORY)
		do
			mem_free ($object)
		end

	full_coalesce is
			-- Coalesce the whole memory: merge adjacent free
			-- blocks to reduce fragmentation. Useful, when
			-- a lot of memory is allocated with garbage collector off.
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"mem_coalesc"
		end

	full_collect is
			-- Force a full collection cycle if garbage
			-- collection is enabled; do nothing otherwise.
			-- (from MEMORY)
		external
			"C | %"eif_garcol.h%""
		alias
			"plsc"
		end

	mem_free (addr: POINTER) is
			-- Free memory of object at addr.
			-- (Preferred interface is free.)
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		end
	
feature -- Obsolete

	lastchar: CHARACTER is
			-- Last character read by read_character
		do
			Result := last_character
		end

	lastdouble: DOUBLE is
			-- Last double read by read_double
		do
			Result := last_double
		end

	lastint: INTEGER is
			-- Last integer read by read_integer
		do
			Result := last_integer
		end

	lastreal: REAL is
			-- Last real read by read_real
		do
			Result := last_real
		end

	laststring: STRING is
			-- Last string read
		do
			Result := last_string
		end
	
feature {NONE} -- Implementation

	find_referers (target: POINTER; esult: POINTER; result_size: INTEGER) is
			-- (from MEMORY)
		external
			"C | %"eif_traverse.h%""
		end

	gc_monitoring (flag: BOOLEAN) is
			-- Set up GC monitoring according to flag
			-- (from MEMORY)
		external
			"C | %"eif_memory.h%""
		alias
			"gc_mon"
		end
	
feature -- Input

	read_character is
			-- Read a new character.
			-- Make result available in last_character.
			-- Was declared in IO_MEDIUM as synonym of readchar.
		require
			is_readable: readable
		deferred
		end

	read_double is
			-- Read a new double.
			-- Make result available in last_double.
			-- Was declared in IO_MEDIUM as synonym of readdouble.
		require
			is_readable: readable
		deferred
		end

	read_integer is
			-- Read a new integer.
			-- Make result available in last_integer.
			-- Was declared in IO_MEDIUM as synonym of readint.
		require
			is_readable: readable
		deferred
		end

	read_line is
			-- Read characters until a new line or
			-- end of medium.
			-- Make result available in last_string.
			-- Was declared in IO_MEDIUM as synonym of readline.
		require
			is_readable: readable
		deferred
		end

	read_real is
			-- Read a new real.
			-- Make result available in last_real.
			-- Was declared in IO_MEDIUM as synonym of readreal.
		require
			is_readable: readable
		deferred
		end

	read_stream (nb_char: INTEGER) is
			-- Read a string of at most nb_char bound characters
			-- or until end of medium is encountered.
			-- Make result available in last_string.
			-- Was declared in IO_MEDIUM as synonym of readstream.
		require
			is_readable: readable
		deferred
		end

	readchar is
			-- Read a new character.
			-- Make result available in last_character.
			-- Was declared in IO_MEDIUM as synonym of read_character.
		require
			is_readable: readable
		deferred
		end

	readdouble is
			-- Read a new double.
			-- Make result available in last_double.
			-- Was declared in IO_MEDIUM as synonym of read_double.
		require
			is_readable: readable
		deferred
		end

	readint is
			-- Read a new integer.
			-- Make result available in last_integer.
			-- Was declared in IO_MEDIUM as synonym of read_integer.
		require
			is_readable: readable
		deferred
		end

	readline is
			-- Read characters until a new line or
			-- end of medium.
			-- Make result available in last_string.
			-- Was declared in IO_MEDIUM as synonym of read_line.
		require
			is_readable: readable
		deferred
		end

	readreal is
			-- Read a new real.
			-- Make result available in last_real.
			-- Was declared in IO_MEDIUM as synonym of read_real.
		require
			is_readable: readable
		deferred
		end

	readstream (nb_char: INTEGER) is
			-- Read a string of at most nb_char bound characters
			-- or until end of medium is encountered.
			-- Make result available in last_string.
			-- Was declared in IO_MEDIUM as synonym of read_stream.
		require
			is_readable: readable
		deferred
		end
	
feature -- Output

	new_line is
			-- Write a new line character to medium
			-- Was declared in IO_MEDIUM as synonym of put_new_line.
		require
			extendible: extendible
		deferred
		end

	put_boolean (b: BOOLEAN) is
			-- Write b to medium.
			-- Was declared in IO_MEDIUM as synonym of putbool.
		require
			extendible: extendible
		deferred
		end

	put_character (c: CHARACTER) is
			-- Write c to medium.
			-- Was declared in IO_MEDIUM as synonym of putchar.
		require
			extendible: extendible
		deferred
		end

	put_double (d: DOUBLE) is
			-- Write d to medium.
			-- Was declared in IO_MEDIUM as synonym of putdouble.
		require
			extendible: extendible
		deferred
		end

	put_integer (i: INTEGER) is
			-- Write i to medium.
			-- Was declared in IO_MEDIUM as synonym of putint.
		require
			extendible: extendible
		deferred
		end

	put_new_line is
			-- Write a new line character to medium
			-- Was declared in IO_MEDIUM as synonym of new_line.
		require
			extendible: extendible
		deferred
		end

	put_real (r: REAL) is
			-- Write r to medium.
			-- Was declared in IO_MEDIUM as synonym of putreal.
		require
			extendible: extendible
		deferred
		end

	put_string (s: STRING) is
			-- Write s to medium.
			-- Was declared in IO_MEDIUM as synonym of putstring.
		require
			extendible: extendible
			non_void: s /= void
		deferred
		end

	putbool (b: BOOLEAN) is
			-- Write b to medium.
			-- Was declared in IO_MEDIUM as synonym of put_boolean.
		require
			extendible: extendible
		deferred
		end

	putchar (c: CHARACTER) is
			-- Write c to medium.
			-- Was declared in IO_MEDIUM as synonym of put_character.
		require
			extendible: extendible
		deferred
		end

	putdouble (d: DOUBLE) is
			-- Write d to medium.
			-- Was declared in IO_MEDIUM as synonym of put_double.
		require
			extendible: extendible
		deferred
		end

	putint (i: INTEGER) is
			-- Write i to medium.
			-- Was declared in IO_MEDIUM as synonym of put_integer.
		require
			extendible: extendible
		deferred
		end

	putreal (r: REAL) is
			-- Write r to medium.
			-- Was declared in IO_MEDIUM as synonym of put_real.
		require
			extendible: extendible
		deferred
		end

	putstring (s: STRING) is
			-- Write s to medium.
			-- Was declared in IO_MEDIUM as synonym of put_string.
		require
			extendible: extendible
			non_void: s /= void
		deferred
		end
	
invariant

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class IO_MEDIUM


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