note
	description: "Object that represents a constant in Eiffel Query Language"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	author: ""
	date: "$Date$"
	revision: "$Revision$"

deferred class
	QL_CONSTANT

inherit
	HASHABLE

feature -- Access

	name: STRING
			-- Name of current
		deferred
		ensure
			result_attached: Result /= Void
			not_result_is_empty: not Result.is_empty
		end

	hash_code: INTEGER
			-- Hash code value
		do
			if internal_hash_code = 0 then
				internal_hash_code := name.hash_code
			end
			Result := internal_hash_code
		ensure then
			internal_hash_code_not_zero: internal_hash_code /= 0
			good_result: Result = internal_hash_code
		end

feature{NONE} -- Implementation

	internal_hash_code: INTEGER
			-- Computed hash-code.

invariant
	name_attached: name /= Void
	not_name_is_empty: not name.is_empty

note
	copyright: "Copyright (c) 1984-2013, 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
			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