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-- C3900050.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.

--*

--

-- OBJECTIVE:

--      See C3900053.AM.

--

-- TEST DESCRIPTION:

--      See C3900053.AM.

--

-- TEST FILES:

--      This test consists of the following files:

--

--      => C3900050.A

--         C3900051.A

--         C3900052.A

--         C3900053.AM

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      15 May 96   SAIC    ACVC 2.1: Modified prologue. Added pragma Elaborate

--                          for Ada.Calendar.

--

--!

with Ada.Calendar;

pragma Elaborate (Ada.Calendar);

package C3900050 is  -- Alert system abstraction.

   -- 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);

   -- 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);

   type Alert_Type is tagged private;                 -- Root tagged type.

   procedure Set_Display (A : in out Alert_Type;      -- To be inherited by

                          D : in     Device_Enum);    -- all derivatives.

   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.

   -- The following functions are needed to verify the values of the

   -- root tagged type's private components.

   function Get_Time (A: Alert_Type) return Ada.Calendar.Time;

   function Get_Display (A: Alert_Type) return Device_Enum;

   function Initial_Values_Okay (A : in Alert_Type)

     return Boolean;

   function Bad_Final_Values (A : in Alert_Type)

     return Boolean;

private

   type Alert_Type is tagged record                    -- Root tagged type.

      Arrival_Time : Ada.Calendar.Time := Default_Time;

      Display_On   : Device_Enum   := Null_Device;

   end record;

end C3900050;

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

package body C3900050 is  -- Alert system abstraction.

   procedure Set_Display (A : in out Alert_Type;

                          D : in     Device_Enum) is

   begin

      A.Display_On := D;

   end Set_Display;

   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;

   function Get_Time (A: Alert_Type) return Ada.Calendar.Time is

   begin

      return A.Arrival_Time;

   end Get_Time;

   function Get_Display (A: Alert_Type) return Device_Enum is

   begin

      return A.Display_On;

   end Get_Display;

   function Initial_Values_Okay (A : in Alert_Type) return Boolean is

   begin

      return (A = (Arrival_Time => Default_Time,         -- Check "=" operator

                   Display_On   => Null_Device));        -- availability.

   end Initial_Values_Okay;                              -- Aggregate with

                                                         -- named associations.

   function Bad_Final_Values (A : in Alert_Type) return Boolean is

   begin

      return (A /= (Alert_Time, Null_Device));           -- Check "/=" operator

                                                         -- availability.

   end Bad_Final_Values;                                 -- Aggregate with

                                                         -- positional assoc.

end C3900050;