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-- FA13A00.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 foundation code is used to check visibility of separate
-- subunit of child packages.
-- Declares a package containing type definitions; package will be
-- with'ed by the root of the elevator abstraction.
--
-- Declare an elevator abstraction in a parent root package which manages
-- basic operations. This package has a private part. Declare a
-- private child package which calculates the floors for going up or
-- down. Declare a public child package which provides the actual
-- operations.
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
-- Simulates a fragment of an elevator operation application.
package FA13A00_0 is -- Building Manager
type Electrical_Power is (Off, V120, V240);
Power : Electrical_Power := V120;
-- other type definitions and procedure declarations in real application.
end FA13A00_0;
-- No bodies provided for FA13A00_0.
--==================================================================--
package FA13A00_1 is -- Basic Elevator Operations
type Call_Waiting_Type is private;
type Floor is (Basement, Floor1, Floor2, Floor3, Penthouse);
type Floor_No is range Floor'Pos(Floor'First) .. Floor'Pos(Floor'Last);
Current_Floor : Floor := Floor1;
TC_Operation : boolean := true;
procedure Call (F : in Floor; C : in out Call_Waiting_Type);
procedure Clear_Calls (C : in out Call_Waiting_Type);
private
type Call_Waiting_Type is array (Floor) of boolean;
Call_Waiting : Call_Waiting_Type := (others => false);
end FA13A00_1;
--==================================================================--
package body FA13A00_1 is
-- Call the elevator.
procedure Call (F : in Floor; C : in out Call_Waiting_Type) is
begin
C (F) := true;
end Call;
--------------------------------------------
-- Clear all calls of the elevator.
procedure Clear_Calls (C : in out Call_Waiting_Type) is
begin
C := (others => false);
end Clear_Calls;
end FA13A00_1;
--==================================================================--
-- Private child package of an elevator application. This package calculates
-- how many floors to go up or down.
private package FA13A00_1.FA13A00_2 is -- Floor Calculation
-- Other type definitions in real application.
procedure Up (HowMany : in Floor_No);
procedure Down (HowMany : in Floor_No);
end FA13A00_1.FA13A00_2;
--==================================================================--
package body FA13A00_1.FA13A00_2 is
-- Go up from the current floor.
procedure Up (HowMany : in Floor_No) is
begin
Current_Floor := Floor'val (Floor'pos (Current_Floor) + HowMany);
end Up;
--------------------------------------------
-- Go down from the current floor.
procedure Down (HowMany : in Floor_No) is
begin
Current_Floor := Floor'val (Floor'pos (Current_Floor) - HowMany);
end Down;
end FA13A00_1.FA13A00_2;
--==================================================================--
-- Public child package of an elevator application. This package provides
-- the actual operation of the elevator.
package FA13A00_1.FA13A00_3 is -- Move Elevator
-- Other type definitions in real application.
procedure Move_Elevator (F : in Floor;
C : in out Call_Waiting_Type);
end FA13A00_1.FA13A00_3;
--==================================================================--
with FA13A00_1.FA13A00_2; -- Floor Calculation
package body FA13A00_1.FA13A00_3 is
-- Going up or down depends on the current floor.
procedure Move_Elevator (F : in Floor;
C : in out Call_Waiting_Type) is
begin
if F > Current_Floor then
FA13A00_1.FA13A00_2.Up (Floor'Pos (F) - Floor'Pos (Current_Floor));
FA13A00_1.Call (F, C);
elsif F < Current_Floor then
FA13A00_1.FA13A00_2.Down (Floor'Pos (Current_Floor) - Floor'Pos (F));
FA13A00_1.Call (F, C);
end if;
end Move_Elevator;
end FA13A00_1.FA13A00_3;
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