note
	description: "Objects that enable to perform a database selection."
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date$"
	revision: "$Revision$"

deferred class
	DV_SEARCHER

inherit
	DV_COMPONENT

	DB_TABLES_ACCESS_USE

feature -- Status report

	user_component_set: BOOLEAN
			-- Is component user set?
		do
			Result := db_table_component /= Void
		end

	can_be_activated: BOOLEAN
			-- Can the component be activated?
		do
			Result := table_code /= 0
		end

feature {DV_COMPONENT} -- Basic operations

	set_table_code (tcode: INTEGER)
			-- Set `tcode' as code of database table from which table rows
			-- will be selected.
			-- This can be changed during activation phase.
		require
			valid_code: is_valid_code (tcode)
		do
			table_code := tcode
		end

	set_user_component (db_table_comp: DV_TABLE_COMPONENT)
			-- Set `db_table_comp' to component user.
		require
			not_activated: not is_activated
			db_table_component_not_void: db_table_comp /= Void
		do
			db_table_component := db_table_comp
		end

	refresh: ARRAYED_LIST [DB_TABLE]
			-- Return tablerows corresponding to last database reading, i.e.
			-- table rows may have changed but query is the same.
		require
			is_activated: is_activated
		deferred
		ensure
			result_not_void: Result /= Void
		end

feature {NONE} -- Implementation

	table_code: INTEGER
			-- Code of table to read.

	db_table_component: detachable DV_TABLE_COMPONENT;
			-- Component user.

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 DV_SEARCHER