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1 149 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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