--------------------------------------------------
--------
------------------------
--                                                                          --
--                           OCARINA COMPONENTS                             --
--                                                                          --
--  O C A R I N A . D I A . P A R S E R . C O R E . C O N N E C T I O N S   --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--               Copyright (C) 2005-2006, 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 Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
with DOM.Core.Nodes;

package body Ocarina.Dia.Parser.Core.Connections is

   --  Parses a connection point
   procedure Get_Connection_Point
     (N  :        DOM.Core.node;
      CP : in out connection_point)
   is
      use DOM.Core;

      AS : constant named_node_map := DOM.Core.Nodes.Attributes (N);
   begin
      CP.Object_ID := To_Unbounded_String (Get_Required_Attribute (AS, "to"));
      CP.Port := Integer'value (Get_Required_Attribute (AS, "connection"));
   end Get_Connection_Point;

   --  Parses the connections associated to a Line node
   function Get_Connection (N : DOM.Core.node) return connection is
      use DOM.Core;

      E : DOM.Core.node;
      C : connection;
   begin
      if N /= null
        and then N.Node_Type = element_node
        and then DOM.Core.Nodes.Node_Name (N) = "dia:connections"
      then

         declare
            SP    : connection_point;
            EP    : connection_point;
            CL : constant DOM.Core.node_list := DOM.Core.Nodes.Child_Nodes (N);
            Index : Natural                     := 0;
         begin
            Get_Required_Child (CL, "dia:connection", Index, E);
            Get_Connection_Point (E, SP);
            Index := Index + 1;
            Get_Required_Child (CL, "dia:connection", Index, E);
            Get_Connection_Point (E, EP);
            C.Start_Point := SP;
            C.End_Point   := EP;
            return C;
         exception
            when Missing_Child =>
               raise Dangling_Connection;
            when Missing_Attribute =>
               raise Missing_Attribute;
         end;

      end if;
      raise Dangling_Connection;
   end Get_Connection;

end Ocarina.Dia.Parser.Core.Connections;