172 lines
5.4 KiB
Plaintext
172 lines
5.4 KiB
Plaintext
-- FA13A00.A
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--
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-- Grant of Unlimited Rights
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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--
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-- DISCLAIMER
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- FOUNDATION DESCRIPTION:
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-- This foundation code is used to check visibility of separate
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-- subunit of child packages.
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-- Declares a package containing type definitions; package will be
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-- with'ed by the root of the elevator abstraction.
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--
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-- Declare an elevator abstraction in a parent root package which manages
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-- basic operations. This package has a private part. Declare a
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-- private child package which calculates the floors for going up or
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-- down. Declare a public child package which provides the actual
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-- operations.
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--
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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--
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--!
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-- Simulates a fragment of an elevator operation application.
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package FA13A00_0 is -- Building Manager
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type Electrical_Power is (Off, V120, V240);
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Power : Electrical_Power := V120;
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-- other type definitions and procedure declarations in real application.
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end FA13A00_0;
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-- No bodies provided for FA13A00_0.
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--==================================================================--
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package FA13A00_1 is -- Basic Elevator Operations
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type Call_Waiting_Type is private;
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type Floor is (Basement, Floor1, Floor2, Floor3, Penthouse);
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type Floor_No is range Floor'Pos(Floor'First) .. Floor'Pos(Floor'Last);
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Current_Floor : Floor := Floor1;
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TC_Operation : boolean := true;
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procedure Call (F : in Floor; C : in out Call_Waiting_Type);
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procedure Clear_Calls (C : in out Call_Waiting_Type);
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private
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type Call_Waiting_Type is array (Floor) of boolean;
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Call_Waiting : Call_Waiting_Type := (others => false);
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end FA13A00_1;
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--==================================================================--
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package body FA13A00_1 is
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-- Call the elevator.
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procedure Call (F : in Floor; C : in out Call_Waiting_Type) is
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begin
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C (F) := true;
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end Call;
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--------------------------------------------
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-- Clear all calls of the elevator.
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procedure Clear_Calls (C : in out Call_Waiting_Type) is
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begin
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C := (others => false);
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end Clear_Calls;
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end FA13A00_1;
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--==================================================================--
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-- Private child package of an elevator application. This package calculates
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-- how many floors to go up or down.
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private package FA13A00_1.FA13A00_2 is -- Floor Calculation
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-- Other type definitions in real application.
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procedure Up (HowMany : in Floor_No);
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procedure Down (HowMany : in Floor_No);
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end FA13A00_1.FA13A00_2;
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--==================================================================--
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package body FA13A00_1.FA13A00_2 is
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-- Go up from the current floor.
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procedure Up (HowMany : in Floor_No) is
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begin
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Current_Floor := Floor'val (Floor'pos (Current_Floor) + HowMany);
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end Up;
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--------------------------------------------
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-- Go down from the current floor.
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procedure Down (HowMany : in Floor_No) is
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begin
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Current_Floor := Floor'val (Floor'pos (Current_Floor) - HowMany);
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end Down;
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end FA13A00_1.FA13A00_2;
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--==================================================================--
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-- Public child package of an elevator application. This package provides
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-- the actual operation of the elevator.
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package FA13A00_1.FA13A00_3 is -- Move Elevator
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-- Other type definitions in real application.
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procedure Move_Elevator (F : in Floor;
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C : in out Call_Waiting_Type);
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end FA13A00_1.FA13A00_3;
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--==================================================================--
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with FA13A00_1.FA13A00_2; -- Floor Calculation
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package body FA13A00_1.FA13A00_3 is
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-- Going up or down depends on the current floor.
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procedure Move_Elevator (F : in Floor;
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C : in out Call_Waiting_Type) is
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begin
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if F > Current_Floor then
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FA13A00_1.FA13A00_2.Up (Floor'Pos (F) - Floor'Pos (Current_Floor));
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FA13A00_1.Call (F, C);
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elsif F < Current_Floor then
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FA13A00_1.FA13A00_2.Down (Floor'Pos (Current_Floor) - Floor'Pos (F));
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FA13A00_1.Call (F, C);
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end if;
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end Move_Elevator;
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end FA13A00_1.FA13A00_3;
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