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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;