------------------------------------------------------------------------------
--                                                                          --
--                           OCARINA COMPONENTS                             --
--                                                                          --
--                OCARINA.CHECKER.QUERIES.ACCESS_PREDICATES                 --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--                 Copyright (C) 2007, GET-Telecom Paris.                   --
--                                                                          --
-- Ocarina  is free software;  you  can  redistribute  it and/or  modify    --
-- it under terms of the GNU General Public License as published by the     --
-- Free Software Foundation; either version 2, or (at your option) any      --
-- later version. Ocarina 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 distributed with Ocarina; see file COPYING.   --
-- If not, write to the Free Software Foundation, 51 Franklin Street, Fifth --
-- Floor, Boston, MA 02111-1301, USA.                                       --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable to be   --
-- covered  by the  GNU  General  Public  License. This exception does not  --
-- however invalidate  any other reasons why the executable file might be   --
-- covered by the GNU Public License.                                       --
--                                                                          --
--                 Ocarina is maintained by the Ocarina team                --
--                       (ocarina-users@listes.enst.fr)                     --
--                                                                          --
------------------------------------------------------------------------------

with Ocarina.Nodes;

package body Ocarina.Checker.Queries.Access_Predicates is
   use Types;
   use Ocarina.Nodes;

   ---------------------------
   -- Is_Accessed_Predicate --
   ---------------------------

   function Is_Accessed_Predicate
     (E      : Node_Id;
      D      : Node_Id;
      Option : Predicates_Search_Options := PSO_Direct)
     return Boolean
   is
      pragma Unreferenced (Option);

      P : Node_Id;
      N : Node_Id;
      K : Node_Id;
   begin
      if Kind (D) = K_Connection_Instance then
         P := Destination (D);
         return (Corresponding_Instance (Item (Last_Node (Path (P)))) = E);
      end if;

      P := First_Node (Features (D));

      while Present (P) loop
         N := First_Node (Destinations (P));
         while Present (N) loop
            K := Item (N);

            if Kind (K) = K_Subcomponent_Access_Instance then

               if Corresponding_Instance (K) = E then
                  return True;
               end if;

            end if;

            N := Next_Node (N);
         end loop;

         P := Next_Node (P);
      end loop;

      return False;
   end Is_Accessed_Predicate;

end Ocarina.Checker.Queries.Access_Predicates;