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+-- CA11009.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 the parent unit of its parent unit.
+--
+-- TEST DESCRIPTION:
+-- Declare a parent package containing 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 structure for
+-- file management.
+--
+--
+-- CHANGE HISTORY:
+-- 06 Dec 94 SAIC ACVC 2.0
+-- 15 Apr 96 SAIC ACVC 2.1: Added pragma Elaborate_body.
+--
+--!
+
+package CA11009_0 is -- Package OS.
+ pragma Elaborate_Body (CA11009_0);
+
+ 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 := 10;
+ An_Ada_File_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;
+
+end CA11009_0; -- Package OS.
+
+ --=================================================================--
+
+package body CA11009_0 is -- Package body OS.
+
+ function Get_File_Name return File_Name_Type is
+ begin
+ return (An_Ada_File_Name); -- Processing would be replace by a user
+ -- prompt in a functioning system.
+ end Get_File_Name;
+
+end CA11009_0; -- Package body OS.
+
+ --=================================================================--
+
+package CA11009_0.CA11009_1 is -- Child Package OS.File_Manager
+
+ -- This package simulates a visible interface for the Operating System.
+ -- The actual processing performed by this routine is encapsulated
+ -- in the routines of private child package Internals, which is "withed"
+ -- by the body of this package.
+
+ procedure Create_File (Mode : in File_Mode_Type;
+ File_Key : out File_Descriptor_Type);
+
+end CA11009_0.CA11009_1; -- Child Package OS.File_Manager
+
+ --=================================================================--
+
+-- Subprogram that performs the actual file operation is contained in a
+-- private package so that it is not accessible to any client, and can be
+-- modified/extended without requiring recompilation of the clients of the
+-- parent (since this package is "withed" by the parent body only.)
+
+
+ -- Grandchild Package OS.File_Manager.Internals
+private package CA11009_0.CA11009_1.CA11009_2 is
+
+ Initial_Permission : constant Permission_Type := User; -- Grandparent
+ Initial_Status : constant File_Status_Type := Open; -- literals.
+ Initial_Filename : constant File_Name_Type := -- Grandparent type.
+ Get_File_Name; -- Grandparent function.
+
+ function Create (Mode : File_Mode_Type)
+ return File_Descriptor_Type; -- Grandparent type.
+
+end CA11009_0.CA11009_1.CA11009_2;
+ -- Grandchild Package OS.File_Manager.Internals
+
+ --=================================================================--
+
+ -- Grandchild Package body OS.File_Manager.Internals
+package body CA11009_0.CA11009_1.CA11009_2 is
+
+ function Next_Available_File return File_Descriptor_Type is
+ begin
+ File_Counter := File_Counter + 1; -- Grandparent object.
+ return (File_Descriptor_Type(File_Counter));
+ end Next_Available_File;
+ -------------------------------------------------------------------------
+ function Create (Mode : File_Mode_Type) -- Grandparent literal.
+ return File_Descriptor_Type is
+ Number : File_Descriptor_Type; -- Grandparent type.
+ begin
+ Number := Next_Available_File;
+ File_Table(Number).Descriptor := Number; -- Grandparent object.
+ File_Table(Number).Name := Initial_Filename;
+ File_Table(Number).Mode := Mode; -- Parameter.
+ File_Table(Number).Acct_Access := Initial_Permission;
+ File_Table(Number).Current_Status := Initial_Status;
+ return (Number);
+ end Create;
+
+end CA11009_0.CA11009_1.CA11009_2;
+ -- Grandchild Package body OS.File_Manager.Internals
+
+ --=================================================================--
+
+ -- "With" of a child package
+ -- by the parent body.
+with CA11009_0.CA11009_1.CA11009_2; -- Grandchild OS.File_Manager.Internals
+
+package body CA11009_0.CA11009_1 is -- Child Package body OS.File_Manager
+
+ package Internal renames CA11009_0.CA11009_1.CA11009_2;
+
+ -- These subprograms utilize calls to subprograms contained in a private
+ -- sibling to perform the actual processing.
+
+ procedure Create_File (Mode : in File_Mode_Type;
+ File_Key : out File_Descriptor_Type) is
+ begin
+ File_Key := Internal.Create (Mode);
+ end Create_File;
+
+end CA11009_0.CA11009_1; -- Child Package body OS.File_Manager
+
+ --=================================================================--
+
+with CA11009_0.CA11009_1; -- with Child Package OS.File_Manager
+with Report;
+
+procedure CA11009 is
+
+ package OS renames CA11009_0;
+ use OS;
+ package File_Manager renames CA11009_0.CA11009_1;
+
+ Data_Base_File_Key : File_Descriptor_Type := Default_Descriptor;
+ New_Mode : File_Mode_Type := Read_Write;
+
+begin
+
+ -- This test indicates one approach to file management.
+ -- It is not intended to demonstrate full functionality, but rather
+ -- that the use of a private child package could provide a solution
+ -- to this type of situation.
+
+ Report.Test ("CA11009", "Check that a private child package can use " &
+ "entities declared in the visible part of the " &
+ "parent unit 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 (not (Data_Base_File_Key = Default_Descriptor)) and then
+ (((not (File_Table(1).Name = Default_Filename)) or
+ (File_Table(1).Descriptor /= Default_Descriptor)) or else
+ ((File_Table(1).Acct_Access /= Default_Permission) or
+ (not (File_Table(1).Mode = Default_Mode)) or
+ (File_Table(1).Current_Status /= Default_Status)))
+ then
+ Report.Failed ("Initial condition failure");
+ end if;
+
+ -- Create/initialize file using the capability provided by the visible
+ -- interface to the operating system, OS.File_Manager. The actual
+ -- processing routine is contained in the private grandchild package
+ -- Internals, which utilize the components from the grandparent package.
+
+ File_Manager.Create_File (New_Mode, Data_Base_File_Key);
+
+ -- Verify that the initial conditions of the file table component have
+ -- been properly modified by the initialization function.
+
+ if not ((File_Table(1).Descriptor = Data_Base_File_Key) and then
+ (File_Table(1).Name = An_Ada_File_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 ("File creation failure");
+ end if;
+
+ Report.Result;
+
+end CA11009;