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jeremybenn |
-- CA11007.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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-- OBJECTIVE:
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-- Check that the private part of a grandchild library unit can
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-- utilize its grandparent unit's private definition.
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--
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-- TEST DESCRIPTION:
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-- Declare a package, child package, and grandchild package, all
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-- with private parts in their specifications.
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--
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-- The private part of the grandchild package will make use of components
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-- that have been declared in the private part of the grandparent
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-- specification.
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--
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-- The child package demonstrates the extension of a parent file type
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-- into an abstraction of an analog file structure. The grandchild package
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-- extends the grandparent file type into an abstraction of a digital
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-- file structure, and provides conversion capability to/from the parent
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-- analog file structure.
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--
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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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package CA11007_0 is -- Package File_Package
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type File_Descriptor is private;
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type File_Type is tagged private;
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function Next_Available_File return File_Descriptor;
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private
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type File_Measure_Type is range 0 .. 1000;
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type File_Descriptor is new Integer;
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Null_Measure : constant File_Measure_Type := File_Measure_Type'First;
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Null_File : constant File_Descriptor := 0;
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type File_Type is tagged
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record
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Descriptor : File_Descriptor := Null_File;
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end record;
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end CA11007_0; -- Package File_Package
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--=================================================================--
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package body CA11007_0 is -- Package body File_Package
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File_Count : Integer := 0;
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function Next_Available_File return File_Descriptor is
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begin
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File_Count := File_Count + 1;
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return File_Descriptor (File_Count);
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end Next_Available_File;
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end CA11007_0; -- Package body File_Package
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--=================================================================--
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package CA11007_0.CA11007_1 is -- Child package Analog
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type Analog_File_Type is new File_Type with private;
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private
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type Wavelength_Type is new File_Measure_Type;
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Min_Wavelength : constant Wavelength_Type := Wavelength_Type'First;
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type Analog_File_Type is new File_Type with -- Parent type.
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record
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Wavelength : Wavelength_Type := Min_Wavelength;
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end record;
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end CA11007_0.CA11007_1; -- Child package Analog
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--=================================================================--
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package CA11007_0.CA11007_1.CA11007_2 is -- Grandchild package Digital
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type Digital_File_Type is new File_Type with private;
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procedure Recording (File : out Digital_File_Type);
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procedure Convert (From : in Analog_File_Type;
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To : out Digital_File_Type);
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function Validate (File : in Digital_File_Type) return Boolean;
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function Valid_Conversion (To : Digital_File_Type) return Boolean;
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function Valid_Initial (From : Analog_File_Type) return Boolean;
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private
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type Track_Type is new File_Measure_Type; -- Grandparent type.
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Min_Tracks : constant Track_Type :=
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Track_Type (Null_Measure) + Track_Type'First; -- Grandparent private
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Max_Tracks : constant Track_Type := -- constant.
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Track_Type (Null_Measure) + Track_Type'Last;
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type Digital_File_Type is new File_Type with -- Grandparent type.
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record
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Tracks : Track_Type := Min_Tracks;
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end record;
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end CA11007_0.CA11007_1.CA11007_2; -- Grandchild package Digital
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--=================================================================--
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-- Grandchild package body Digital
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package body CA11007_0.CA11007_1.CA11007_2 is
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procedure Recording (File : out Digital_File_Type) is
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begin
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File.Descriptor := Next_Available_File; -- Assign new file descriptor.
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File.Tracks := Max_Tracks; -- Change initial value.
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end Recording;
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--------------------------------------------------------------------------
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procedure Convert (From : in Analog_File_Type;
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To : out Digital_File_Type) is
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begin
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To.Descriptor := From.Descriptor + 100; -- Dummy conversion.
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To.Tracks := Track_Type (From.Wavelength) / 2;
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end Convert;
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--------------------------------------------------------------------------
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function Validate (File : in Digital_File_Type) return Boolean is
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Result : Boolean := False;
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begin
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if not (File.Tracks /= Max_Tracks) then
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Result := True;
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end if;
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return Result;
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end Validate;
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--------------------------------------------------------------------------
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function Valid_Conversion (To : Digital_File_Type) return Boolean is
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begin
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return (To.Descriptor = 100) and (To.Tracks = (Min_Tracks / 2));
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end Valid_Conversion;
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--------------------------------------------------------------------------
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function Valid_Initial (From : Analog_File_Type) return Boolean is
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begin
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return (From.Wavelength = Min_Wavelength); -- Validate initial
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end Valid_Initial; -- conditions.
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end CA11007_0.CA11007_1.CA11007_2; -- Grandchild package body Digital
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--=================================================================--
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with CA11007_0.CA11007_1.CA11007_2; -- with Grandchild package Digital
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with Report;
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procedure CA11007 is
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package Analog renames CA11007_0.CA11007_1;
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package Digital renames CA11007_0.CA11007_1.CA11007_2;
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Original_Digital_File,
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Converted_Digital_File : Digital.Digital_File_Type;
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Original_Analog_File : Analog.Analog_File_Type;
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begin
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-- This code demonstrates how private extensions could be utilized
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-- in child packages to allow for recording on different media.
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-- The processing contained in the procedures and functions is
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-- "dummy" processing, not intended to perform actual recording,
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-- conversion, or validation operations, but simply to demonstrate
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-- this type of structural decomposition as a possible solution to
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-- a user's design problem.
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Report.Test ("CA11007", "Check that the private part of a grandchild " &
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"library unit can utilize its grandparent " &
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"unit's private definition");
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if not Digital.Valid_Initial (Original_Analog_File)
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then
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Report.Failed ("Incorrect initialization of Analog File");
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end if;
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---
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Digital.Convert (From => Original_Analog_File, -- Convert file to
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To => Converted_Digital_File); -- digital format.
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if not Digital.Valid_Conversion (To => Converted_Digital_File) then
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Report.Failed ("Incorrect conversion of analog file");
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end if;
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---
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Digital.Recording (Original_Digital_File); -- Create file in
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-- digital format.
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if not Digital.Validate (Original_Digital_File) then
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Report.Failed ("Incorrect recording of digital file");
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end if;
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Report.Result;
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end CA11007;
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