File : src/aws-services-dispatchers-transient_pages.adb


------------------------------------------------------------------------------
--                              Ada Web Server                              --
--                                                                          --
--                            Copyright (C) 2003                            --
--                                ACT-Europe                                --
--                                                                          --
--  Authors: Dmitriy Anisimkov - Pascal Obry                                --
--                                                                          --
--  This library is free software; you can redistribute it and/or modify    --
--  it under the terms of the GNU General Public License as published by    --
--  the Free Software Foundation; either version 2 of the License, or (at   --
--  your option) any later version.                                         --
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--  This library is distributed in the hope that it will be useful, but     --
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--  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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      --
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------------------------------------------------------------------------------

--  $RCSfile: aws-services-dispatchers-transient_pages.adb,v $
--  $Revision: 1.3 $ $Date: 2003/11/12 22:52:50 $ $Author: obry $

with AWS.Dispatchers.Callback;
with AWS.Messages;
with AWS.Resources.Streams;
with AWS.Services.Transient_Pages;

package body AWS.Services.Dispatchers.Transient_Pages is

   use AWS.Dispatchers;

   use type AWS.Resources.Streams.Stream_Access;

   --------------
   -- Dispatch --
   --------------

   function Dispatch
     (Dispatcher : in Handler;
      Request    : in Status.Data)
      return Response.Data
   is
      use type Messages.Status_Code;

      Result : Response.Data;
   begin
      Result := Dispatch (Dispatcher.Action.all, Request);

      if Response.Status_Code (Result) = Messages.S404 then
         --  Page not found, look if this is a transient page

         declare
            URI    : constant String := Status.URI (Request);
            Stream : constant AWS.Resources.Streams.Stream_Access
              := Services.Transient_Pages.Get (URI);
         begin
            if Stream = null then
               --  This page is not a transient one
               return Result;

            else
               return Response.Stream
                 (Status.Content_Type (Request),
                  Stream,
                  Server_Close => False);
            end if;
         end;

      else
         return Result;
      end if;
   end Dispatch;

   --------------
   -- Register --
   --------------

   procedure Register
     (Dispatcher : in out Handler;
      Action     : in     AWS.Dispatchers.Handler'Class) is
   begin
      if Dispatcher.Action /= null then
         Free (Dispatcher.Action);
      end if;

      Dispatcher.Action := new AWS.Dispatchers.Handler'Class'(Action);
   end Register;

   procedure Register
     (Dispatcher : in out Handler;
      Action     : in     Response.Callback) is
   begin
      Register (Dispatcher, AWS.Dispatchers.Callback.Create (Action));
   end Register;

end AWS.Services.Dispatchers.Transient_Pages;