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-- CA11008.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.

--*

--

-- OBJECTIVE:

--      Check that a private child package can use entities declared in the

--      visible part of its parent unit.

--

-- TEST DESCRIPTION:

--      Declare a parent package containing types and objects used

--      by the system. Declare a private child package that uses the parent

--      components to provide functionality to the system.

--

--      The tagged file type defined in the parent has defaults for all

--      component fields.  Prior to initialization, these values are checked

--      to ensure a correct start condition.  The initial subprogram is

--      called, which utilizes the functionality provided in the private

--      child package.  This subprogram changes the fields of the file object

--      to something other than the default values, and this process is then

--      verified at the conclusion of the test.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

package CA11008_0 is               -- Package OS.

   type File_Descriptor_Type is new Integer;

   type File_Name_Type       is new String (1 .. 11);

   type Permission_Type      is (None, User, System, Bypass);

   type File_Mode_Type       is (Read_Only, Write_Only, Read_Write);

   type File_Status_Type     is (Open, Closed);

   Default_Descriptor : constant File_Descriptor_Type := 0;

   Default_Permission : constant Permission_Type      := None;

   Default_Mode       : constant File_Mode_Type       := Read_Only;

   Default_Status     : constant File_Status_Type     := Closed;

   Default_Filename   : constant File_Name_Type       := "           ";

   Max_Files          : constant File_Descriptor_Type := 100;

   Constant_Name      : constant File_Name_Type       := "AdaFileName";

   File_Counter       : Integer                       := 0;

   type File_Type is tagged

      record

         Descriptor     : File_Descriptor_Type := Default_Descriptor;

         Name           : File_Name_Type       := Default_Filename;

         Acct_Access    : Permission_Type      := Default_Permission;

         Mode           : File_Mode_Type       := Default_Mode;

         Current_Status : File_Status_Type     := Default_Status;

      end record;

   type File_Array_Type is array (1 .. Max_Files) of File_Type;

   File_Table : File_Array_Type;

   --

   function Get_File_Name return File_Name_Type;

   function Initialize_File return File_Descriptor_Type;

end CA11008_0;                     -- Package OS.

     --=================================================================--

-- Subprograms that perform the actual file operations are contained in a

-- private package so that they are not accessible to any client.

private package CA11008_0.CA11008_1 is  -- Package OS.Internals

   Private_File_Counter : Integer renames File_Counter;          -- Parent

                                                                 -- object.

   function Initialize

     (File_Name : File_Name_Type := Get_File_Name;      -- Parent function.

      File_Mode : File_Mode_Type := Read_Write)         -- Parent literal.

     return File_Descriptor_Type;                       -- Parent type.

end CA11008_0.CA11008_1;             -- Package OS.Internals

     --=================================================================--

package body CA11008_0.CA11008_1 is  -- Package body OS.Internals

   function Next_Available_File return File_Descriptor_Type is

   begin

      Private_File_Counter := Private_File_Counter + 1;

      return (File_Descriptor_Type(File_Counter));

   end Next_Available_File;

   -----------------------------------------------------------------

   function Initialize

     (File_Name : File_Name_Type := Get_File_Name; -- Parent function

      File_Mode : File_Mode_Type := Read_Write)    -- Parent literal

     return File_Descriptor_Type is                -- Parent type

      Number : File_Descriptor_Type;

   begin

      Number := Next_Available_File;

      File_Table(Number).Descriptor := Number;     -- Parent object

      File_Table(Number).Name := File_Name;        -- Default parameter value

      File_Table(Number).Mode := File_Mode;        -- Default parameter value

      File_Table(Number).Acct_Access := User;

      File_Table(Number).Current_Status := Open;

      return (Number);

   end Initialize;

end CA11008_0.CA11008_1;           -- Package body OS.Internals

     --=================================================================--

with CA11008_0.CA11008_1;          -- Private child package "withed" by

                                   -- parent body.

package body CA11008_0 is          -- Package body OS

   function Get_File_Name return File_Name_Type is

   begin

      return (Constant_Name);   -- Of course if this was a real function, the

   end Get_File_Name;           -- user would be asked to input a name, or

                                -- there would be some type of similar process.

   -- This subprogram utilizes a call to a subprogram contained in a private

   -- child to perform the actual processing.

   function Initialize_File return File_Descriptor_Type is

   begin

     return (CA11008_0.CA11008_1.Initialize);    -- No parameters are needed,

                                                 -- since defaults have been

                                                 -- provided.

   end Initialize_File;

end CA11008_0;                         -- Package body OS

     --=================================================================--

with CA11008_0;                        -- with Package OS.

with Report;

procedure CA11008 is

   package OS renames CA11008_0;

   use OS;

   Ada_File_Key : File_Descriptor_Type := Default_Descriptor;

begin

   -- This test indicates one approach to file management operations.

   -- It is not intended to demonstrate full functionality, but rather

   -- that the use of a private child package can provide a solution

   -- to a user situation, that being the implementation of certain functions

   -- being provided in a child package, with the parent package body

   -- utilizing these implementations.

   Report.Test ("CA11008", "Check that a private child package can use "   &

                           "entities declared in the visible part of its " &

                           "parent unit");

   -- Check initial conditions of the first entry in the file table.

   -- These are all default values provided in the declaration of the

   -- type File_Type.

   if (Ada_File_Key                 /= Default_Descriptor)  or else

      (File_Table(1).Descriptor     /= (Default_Descriptor) or

      (File_Table(1).Name           /= Default_Filename))   or else

      (File_Table(1).Acct_Access    /= (Default_Permission) or

      (File_Table(1).Mode           /= Default_Mode))       or else

      (File_Table(1).Current_Status /= Default_Status)

   then

      Report.Failed ("Initial condition failure");

   end if;

   -- Call the initialization function.  This will result in the resetting

   -- of the fields associated with the first entry in the File_Table (this

   -- is the first call of Initialize_File).

   -- No parameters are necessary for this call, due to the default values

   -- provided in the private child package routine Initialize.

   Ada_File_Key := Initialize_File;

   -- Verify that the initial conditions of the file table component have

   -- been properly modified by the initialization function.

   if not ((File_Table(1).Descriptor     = Ada_File_Key)         and then

           (File_Table(1).Name           = Constant_Name) and then

           (File_Table(1).Acct_Access    = User)              and then

           not ((File_Table(1).Mode      = Default_Mode)      or else

                (File_Table(1).Current_Status = Default_Status)))

   then

      Report.Failed ("Initialization processing failure");

   end if;

   Report.Result;

end CA11008;