new function. (query_backend_get_uids): new function. (query_backend_new):

2002-08-05  Rodrigo Moya <rodrigo@ximian.com>

	* pcs/query-backend.[ch] (query_backend_get_object_component): new
	function.
	(query_backend_get_uids): new function.
	(query_backend_new): create the static GHashTable if it hasn't been
	created yet.
	(query_backend_destroy): destroy the static GHashTable if empty.
	(foreach_uid_cb): call object_updated_cb, which does everything.

	* pcs/query.c: make use of the new QueryBackend class.
	(query_init): initialize new private structure member.
	(query_destroy): clean up new member, without freeing it, since it is
	managed internally in query-backend.c.
	(query_construct): create a QueryBackend for the query.

svn path=/trunk/; revision=17713

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