Added notion of mapping factory, so one can implement a handler without having to implement new_mapping

Added filter context handler
Added WSF_STARTS_WITH_ROUTING_HANDLER and WSF_URI_ROUTING_HANDLER (in addition to the uri template version)

library/server/wsf/src/filter/wsf_filter_context_handler.e

@@ -0,0 +1,34 @@
+note
+	description: "Summary description for {WSF_FILTER_CONTEXT_HANDLER}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	WSF_FILTER_CONTEXT_HANDLER [C -> WSF_HANDLER_CONTEXT create make end, H -> WSF_CONTEXT_HANDLER [C]]
+
+inherit
+	WSF_FILTER_HANDLER [H]
+
+	WSF_CONTEXT_HANDLER [C]
+
+feature {NONE} -- Implementation
+
+	execute_next (ctx: C; req: WSF_REQUEST; res: WSF_RESPONSE)
+		do
+			if attached next as n then
+				n.execute (ctx, req, res)
+			end
+		end
+
+note
+	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, 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