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-- F390A00.A
--
--                             Grant of Unlimited Rights
--
--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 
--     unlimited rights in the software and documentation contained herein.
--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
--     this public release, the Government intends to confer upon all 
--     recipients unlimited rights  equal to those held by the Government.  
--     These rights include rights to use, duplicate, release or disclose the 
--     released technical data and computer software in whole or in part, in 
--     any manner and for any purpose whatsoever, and to have or permit others 
--     to do so.
--
--                                    DISCLAIMER
--
--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 
--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 
--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
--     PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- FOUNDATION DESCRIPTION:
--      This file declares the root type and primitive subprograms of an
--      alert system abstraction, to be used for tests covering tagged
--      types and type extensions.
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--      04 Jun 96   SAIC    ACVC 2.1: Added pragma Elaborate for Ada.Calendar.
--
--!

with Ada.Calendar;
pragma Elaborate (Ada.Calendar);

package F390A00 is  -- Alert system abstraction.


   -- Declarations used by component Display_On and procedure Display.

   type Device_Enum      is (Null_Device, Teletype, Console, Big_Screen);
   type Display_Counters is array (Device_Enum) of Natural;

   Display_Count_For : Display_Counters := (others => 0);


   -- Declarations used by component Arrival_Time.

   Default_Time : constant Ada.Calendar.Time :=
                    Ada.Calendar.Time_Of (1901, 1, 1);
   Alert_Time   : constant Ada.Calendar.Time :=
                    Ada.Calendar.Time_Of (1991, 6, 15);



   type Alert_Type is tagged record                   -- Root tagged type.
      Arrival_Time : Ada.Calendar.Time := Default_Time;
      Display_On   : Device_Enum   := Null_Device;
   end record;


   procedure Display (A : in Alert_Type);             -- To be inherited by
                                                      -- all derivatives.

   procedure Handle (A : in out Alert_Type);          -- To be overridden by
                                                      -- all derivatives.

end F390A00;


     --==================================================================--


package body F390A00 is  -- Alert system abstraction.


   procedure Display (A : in Alert_Type) is
   begin
      Display_Count_For (A.Display_On) := Display_Count_For (A.Display_On) + 1;
   end Display;


   procedure Handle (A : in out Alert_Type) is
   begin
      A.Arrival_Time := Alert_Time;
      Display (A);
   end Handle;


end F390A00;