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------------------------------------------------------------------------------
--                              Ada Web Server                              --
--                                                                          --
--                     Copyright (C) 2000-2012, AdaCore                     --
--                                                                          --
--  This library 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 3,  or (at your  option) any --
--  later version. This library is distributed in the hope that it will be  --
--  useful, but WITHOUT ANY WARRANTY;  without even the implied warranty of --
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--                                                                          --
--                                                                          --
--  You should have received a copy of the GNU General Public License and   --
--  a copy of the GCC Runtime Library Exception along with this program;    --
--  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see   --
--  <http://www.gnu.org/licenses/>.                                         --
--                                                                          --
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--                                                                          --
------------------------------------------------------------------------------

--  Dispatch a specific request to a callback depending on the request method

with AWS.Dispatchers;
with AWS.Response;
with AWS.Status;

package AWS.Services.Dispatchers.Method is

   type Handler is new AWS.Dispatchers.Handler with private;

   procedure Register
     (Dispatcher : in out Handler;
      Method     : Status.Request_Method;
      Action     : AWS.Dispatchers.Handler'Class);
   --  Register callback to use for a specific request method

   procedure Register
     (Dispatcher : in out Handler;
      Method     : Status.Request_Method;
      Action     : Response.Callback);
   --  Idem as above but take a callback procedure as parameter

   procedure Unregister
     (Dispatcher : in out Handler;
      Method     : Status.Request_Method);
   --  Removes Method from the list of request method to handle

   procedure Register_Default_Callback
     (Dispatcher : in out Handler;
      Action     : AWS.Dispatchers.Handler'Class);
   --  Register the default callback. This will be used if no request method
   --  have been activated.

private

   overriding procedure Initialize (Dispatcher : in out Handler);
   overriding procedure Finalize   (Dispatcher : in out Handler);

   overriding function Dispatch
     (Dispatcher : Handler;
      Request    : Status.Data) return Response.Data;
   --  Dispatch to the corresponding method callback, if no such callback
   --  registered it dispatches to the default callback. If there is no default
   --  callback it returns an error message (code 404).

   overriding function Clone (Dispatcher : Handler) return Handler;
   --  Returns a deep copy of the dispatcher

   type Method_Table is
     array (Status.Request_Method) of AWS.Dispatchers.Handler_Class_Access;

   type Handler is new AWS.Dispatchers.Handler with record
      Action : AWS.Dispatchers.Handler_Class_Access;
      Table  : Method_Table;
   end record;

end AWS.Services.Dispatchers.Method;