note
	description: "Object that represents a special metric which only returns number of items in a given domain as value"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	author: ""
	date: "$Date$"
	revision: "$Revision$"

class
	QL_METRIC_COUNT

inherit
	QL_METRIC

	QL_SHARED_UNIT

feature -- Value

	value (a_domain: QL_DOMAIN): QL_QUANTITY_DOMAIN
			-- Value of current metric
		local
			l_quantity: QL_QUANTITY
		do
			unit := no_unit
			create l_quantity.make_with_value (a_domain.count)
			Result := l_quantity.wrapped_domain
		end

	criteria: LIST [QL_CRITERION]
			-- List of criteria set to current metric
		do
			create {LINKED_LIST [QL_CRITERION]} Result.make
		end

feature -- Setting

	set_criterion (a_criterion: QL_CRITERION)
			-- Set criterion used when calculate metric
			-- A metric can have several basic scopes, and `a_criterion' is only set into
			-- that scope which has the same scope as `a_criterion'.
		do
			-- Current metric doesn't need a criterion.
		end

	remove_criteria
			-- Remove all criteria
		do
			-- Nothing needs to be done here.
		end

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