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note
	description: "[
		Objects that may be stored and retrieved along with all their dependents.
		This class may be used as ancestor by classes needing its facilities.
	]"
	library: "Free implementation of ELKS library"
	status: "See notice at end of class."
	legal: "See notice at end of class."
	date: "$Date: 2014-11-25 12:51:29 -0800 (Tue, 25 Nov 2014) $"
	revision: "$Revision: 96156 $"

class interface
	STORABLE

create 
	default_create

feature -- Access

	retrieved (medium: IO_MEDIUM): detachable ANY
			-- Retrieved object structure, from external
			-- representation previously stored in `medium'.
			-- To access resulting object under correct type,
			-- use assignment attempt.
			-- Will raise an exception (code Retrieve_exception)
			-- if medium content is not a stored Eiffel structure.
		require
			medium_not_void: medium /= Void
			medium_exists: medium.exists
			medium_is_open_read: medium.is_open_read
			medium_supports_storable: medium.support_storable

	retrieve_by_name (file_name: STRING_8): detachable ANY
			-- Retrieve object structure, from external
			-- representation previously stored in a file
			-- called `file_name'.
			-- To access resulting object under correct type,
			-- use assignment attempt.
			-- Will raise an exception (code Retrieve_exception)
			-- if file content is not a stored Eiffel structure.
			-- Will return Void if the file does not exist or
			-- is not readable.
		require
			file_name_exists: file_name /= Void
			file_name_meaningful: not file_name.is_empty
	
feature -- Setting

	set_discard_pointers (v: BOOLEAN)
			-- If `v' it will discard POINTER values and replace them by
			-- the default_pointer pointer. Otherwise it keeps the original value.
	
feature -- Element change

	basic_store (medium: IO_MEDIUM)
			-- Produce on `medium' an external representation of the
			-- entire object structure reachable from current object.
			-- Retrievable within current system only.
		require
			medium_not_void: medium /= Void
			medium_exists: medium.exists
			medium_is_open_write: medium.is_open_write
			medium_supports_storable: medium.support_storable

	independent_store (medium: IO_MEDIUM)
			-- Produce on `medium' an external representation of the
			-- entire object structure reachable from current object.
			-- Retrievable from other systems for the same or other
			-- platform (machine architecture).
		require
			medium_not_void: medium /= Void
			medium_exists: medium.exists
			medium_is_open_write: medium.is_open_write
			medium_supports_storable: medium.support_storable

	store_by_name (file_name: STRING_8)
			-- Produce on file called `file_name' an external
			-- representation of the entire object structure
			-- reachable from current object.
			-- Retrievable from other systems for same platform
			-- (machine architecture).
		require
			file_name_not_void: file_name /= Void
			file_name_meaningful: not file_name.is_empty
	
note
	copyright: "Copyright (c) 1984-2014, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class STORABLE


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