indexing
	description: "[
		A printer interface for outputing information to a UI.
	]"
	legal: "See notice at end of class."
	status: "See notice at end of class.";
	date: "$Date$";
	revision: "$Revision $"

deferred class
	TEXT_PRINTER

feature -- Output

	new_line is
			-- Write a new line character to medium
		require
			is_writable: is_writable
		deferred
		end

	put_string_8 (a_value: STRING_8) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
			a_value_attached: a_value /= Void
		deferred
		end

	put_string_32 (a_value: STRING_32) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
			a_value_attached: a_value /= Void
		deferred
		end

	put_character_8 (a_value: CHARACTER_8) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
			a_value_printable: a_value.is_printable
		deferred
		end

	put_character_32 (a_value: CHARACTER_32) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_integer_8 (a_value: INTEGER_8) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_integer_16 (a_value: INTEGER_16) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_integer_32 (a_value: INTEGER) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_integer_64 (a_value: INTEGER_64) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_natural_8 (a_value: NATURAL_8) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_natural_16 (a_value: NATURAL_16) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_natural_32 (a_value: NATURAL_32) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_natural_64 (a_value: NATURAL_64) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_boolean (a_value: BOOLEAN) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_real_32 (a_value: REAL_32) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

	put_real_64 (a_value: REAL_64) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		deferred
		end

feature -- Output defaults

	put_string (a_value: STRING_GENERAL) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
			a_value_attached: a_value /= Void
		local
			l_s8: STRING_8
			l_s32: STRING_32
		do
			l_s8 ?= a_value
			if l_s8 /= Void then
				put_string_8 (l_s8)
			else
				l_s32 ?= a_value
				check l_s32_attached: l_s32 /= Void end
				put_string_32 (l_s32)
			end
		end

	put_character (a_value: CHARACTER) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		do
			put_character_8 (a_value)
		end

	put_integer (a_value: INTEGER) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		do
			put_integer_32 (a_value)
		end

	put_natural (a_value: NATURAL) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		do
			put_natural_32 (a_value)
		end

	put_real (a_value: REAL_32) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		do
			put_real_32 (a_value)
		end

	put_double (a_value: DOUBLE) is
			-- Write `a_value' to printer.
		require
			is_writable: is_writable
		do
			put_real_64 (a_value)
		end

feature -- Basic operations

	flush is
			-- Flushes any buffered content.
		deferred
		end

feature -- Status report

	is_writable: BOOLEAN is
			-- Determines if printer can be written to
		deferred
		end

;indexing
	copyright:	"Copyright (c) 1984-2006, Eiffel Software"
	license:	"GPL version 2 (see http://www.eiffel.com/licensing/gpl.txt)"
	licensing_options:	"http://www.eiffel.com/licensing"
	copying: "[
			This file is part of Eiffel Software's Eiffel Development Environment.
			
			Eiffel Software's Eiffel Development Environment is free
			software; you can redistribute it and/or modify it under
			the terms of the GNU General Public License as published
			by the Free Software Foundation, version 2 of the License
			(available at the URL listed under "license" above).
			
			Eiffel Software's Eiffel Development Environment is
			distributed in the hope that it will be useful,	but
			WITHOUT ANY WARRANTY; without even the implied warranty
			of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
			See the	GNU General Public License for more details.
			
			You should have received a copy of the GNU General Public
			License along with Eiffel Software's Eiffel Development
			Environment; if not, write to the Free Software Foundation,
			Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
		]"
	source: "[
			 Eiffel Software
			 356 Storke Road, 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 {TEXT_PRINTER}