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-- CA11011.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

--      private part of the parent unit of its parent unit.

--

-- TEST DESCRIPTION:

--      Declare a parent package containing private types and objects

--      used by the system.  Declare a public child package that

--      provides a visible interface to the system functionality.

--      Declare a private grandchild package that uses the visible grandparent

--      components to provide the actual functionality to the system.

--

--      The public child (parent of the private grandchild) uses the

--      functionality of its private child (grandchild package) to provide

--      the visible interface to operations of the system.

--

--      The test itself will utilize the visible interface provided in the

--      public child package to demonstrate a possible solution to file

--      management.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

package CA11011_0 is               -- Package OS.

   type File_Descriptor_Type is private;

   Default_Descriptor  : constant File_Descriptor_Type;

   First_File          : constant File_Descriptor_Type;

   procedure Verify_Initial_Conditions (Key    : in     File_Descriptor_Type;

                                        Status :    out Boolean);

   function Final_Conditions_Valid (Key : File_Descriptor_Type)

     return Boolean;

private

   type File_Descriptor_Type    is new Integer;

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

   type Permission_Type         is (None, User, System);

   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;

   First_File         : constant File_Descriptor_Type := 1;

   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       := "           ";

   Init_Permission    : constant Permission_Type      := User;

   Init_Mode          : constant File_Mode_Type       := Read_Write;

   Init_Status        : constant File_Status_Type     := Open;

   An_Ada_File_Name   : constant File_Name_Type       := "AdaFileName";

   Max_Files          : constant File_Descriptor_Type := 10;

   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;

   File_Counter : Integer := 0;

   --

   function  Get_File_Name return File_Name_Type;

end CA11011_0;                     -- Package OS.

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

package body CA11011_0 is          -- Package body OS.

   function Get_File_Name return File_Name_Type is

   begin

      return (An_Ada_File_Name);

   end Get_File_Name;

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

   procedure Verify_Initial_Conditions (Key    : in     File_Descriptor_Type;

                                        Status :    out Boolean) is

   begin

      Status := False;

      if (File_Table(Key).Descriptor     = Default_Descriptor) and then

         (File_Table(Key).Name           = Default_Filename)   and then

         (File_Table(Key).Acct_Access    = Default_Permission) and then

         (File_Table(Key).Mode           = Default_Mode)       and then

         (File_Table(Key).Current_Status = Default_Status)

      then

         Status := True;

      end if;

   end Verify_Initial_Conditions;

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

   function Final_Conditions_Valid (Key : File_Descriptor_Type)

     return Boolean is

   begin

      if  ((File_Table(Key).Descriptor          = First_File)         and then

           (File_Table(Key).Name                = An_Ada_File_Name)   and then

           (File_Table(Key).Acct_Access         = Init_Permission)    and then

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

                (File_Table(Key).Current_Status = Default_Status)))

      then

         return (True);

      else

         return (False);

      end if;

   end Final_Conditions_Valid;

end CA11011_0;                     -- Package body OS.

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

package CA11011_0.CA11011_1 is     -- Package OS.File_Manager

   procedure Create_File (File_Key : in File_Descriptor_Type);

end CA11011_0.CA11011_1;           -- Package OS.File_Manager

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

-- The Subprogram that performs the actual file operations is contained in a

-- private package so that it is not accessible to any client.

-- Default parameters are used in most cases in the subprogram calls, since

-- the caller does not have visibility to these private types.

                                   -- Package OS.File_Manager.Internals

private package CA11011_0.CA11011_1.CA11011_2 is

   Private_File_Counter : Integer renames File_Counter;         -- Grandparent

                                                                -- object.

   procedure Create

     (Key         : in     File_Descriptor_Type;

      File_Name   : in     File_Name_Type   := Get_File_Name;   -- Grandparent

                                                                -- prvt type,

                                                                -- prvt functn.

      File_Mode   : in     File_Mode_Type   := Init_Mode;       -- Grandparent

                                                                -- prvt type,

                                                                -- prvt const.

      File_Access : in     Permission_Type  := Init_Permission; -- Grandparent

                                                                -- prvt type,

                                                                -- prvt const.

      File_Status : in     File_Status_Type := Init_Status);    -- Grandparent

                                                                -- prvt type,

                                                                -- prvt const.

end CA11011_0.CA11011_1.CA11011_2;   -- Package OS.File_Manager.Internals

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

                                     -- Package Body OS.File_Manager.Internals

package body CA11011_0.CA11011_1.CA11011_2 is

   procedure Create

     (Key         : in     File_Descriptor_Type;

      File_Name   : in     File_Name_Type   := Get_File_Name;

      File_Mode   : in     File_Mode_Type   := Init_Mode;

      File_Access : in     Permission_Type  := Init_Permission;

      File_Status : in     File_Status_Type := Init_Status) is

   begin

      Private_File_Counter := Private_File_Counter + 1;

      File_Table(Key).Descriptor     := Key;            -- Grandparent object.

      File_Table(Key).Name           := File_Name;

      File_Table(Key).Mode           := File_Mode;

      File_Table(Key).Acct_Access    := File_Access;

      File_Table(Key).Current_Status := File_Status;

   end Create;

end CA11011_0.CA11011_1.CA11011_2;   -- Package body OS.File_Manager.Internals

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

with CA11011_0.CA11011_1.CA11011_2;  -- with Child OS.File_Manager.Internals

package body CA11011_0.CA11011_1 is  -- Package body OS.File_Manager

   package Internal renames CA11011_0.CA11011_1.CA11011_2;

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

   -- child to perform the actual processing.

   procedure Create_File (File_Key : in File_Descriptor_Type) is

   begin

      Internal.Create (Key => File_Key);  -- Other parameters are defaults,

                                          -- since they are of private types

                                          -- from the parent package.

                                          -- File_Descriptor_Type is private,

                                          -- but declared in visible part of

                                          -- parent spec.

   end Create_File;

end CA11011_0.CA11011_1;        -- Package body OS.File_Manager

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

with CA11011_0.CA11011_1;       -- with public Child Package OS.File_Manager

with Report;

procedure CA11011 is

   package OS           renames CA11011_0;

   package File_Manager renames CA11011_0.CA11011_1;

   Data_Base_File_Key : OS.File_Descriptor_Type := OS.First_File;

   TC_Status          : Boolean := False;

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 typical user situation.

   Report.Test ("CA11011", "Check that a private child package can use "   &

                           "entities declared in the private part of the " &

                           "parent unit of its parent unit");

   OS.Verify_Initial_Conditions (Data_Base_File_Key, TC_Status);

   if not TC_Status then

      Report.Failed ("Initial condition failure");

   end if;

   -- Perform file initializations.

   File_Manager.Create_File (File_Key => Data_Base_File_Key);

   TC_Status := OS.Final_Conditions_Valid (Data_Base_File_Key);

   if not TC_Status then

      Report.Failed ("Bad status return from Create_File");

   end if;

   Report.Result;

end CA11011;