cxa9002.a

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-- CXA9002.A
--
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--     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 the operations defined in the generic package 
--      Ada.Storage_IO provide the ability to store and retrieve objects 
--      of tagged types from in-memory buffers.
--
-- TEST DESCRIPTION:
--      The following scenario demonstrates how objects of a tagged type, 
--      extended types, and twice extended types can be written/read
--      to/from Direct_IO files. The Storage_IO subprograms, Read and Write, 
--      demonstrated in this scenario, perform tag "fixing" prior to/following
--      transfer to the Direct_IO files.
--      This method is especially important for those implementations that 
--      represent tags as pointers, or for cases where the tagged objects
--      are read in by a program other than the one that wrote them.  
--
--      In this small example, we have attempted to simulate the situation 
--      where two independent programs are using a series of Direct_IO files,
--      one writing data to the files, and the second program reading the 
--      data from those files.  Two procedures are defined, the first
--      simulating the program responsible for writing, the second simulating 
--      a separate program opening and reading the data from the files.  
--      
--      The hierarchy of types used in this test can be displayed as follows:
--      
--                                Account_Type
--                                 /       \
--                                /         \
--                               /           \
--                  Cash_Account_Type       Investment_Account_Type
--                     /         \
--                    /           \
--                   /             \
--      Checking_Account_Type    Savings_Account_Type
--      
-- APPLICABILITY CRITERIA: 
--      Applicable to implementations capable of supporting external
--      Direct_IO files.
--
--       
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--      08 Nov 95   SAIC    Corrected incorrect prefix of 'Tag for ACVC 2.0.1,
--                          and mode of files in Procedure Read_Data.
--                          Added verification of objects reconstructed from
--                          files.
--      27 Feb 97   PWB.CTA Allowed for non-support of some IO operations
--!

package CXA9002_0 is

   type Investment_Type is (Stocks, Bonds, Mutual_Funds);
   type Savings_Type    is (Standard, Business, Impound);

   type Account_Type is tagged 
      record
         Num : String (1..3);
      end record;

   type Cash_Account_Type is new Account_Type with
      record
         Years_As_Customer : Natural := 1;
      end record;

   type Investment_Account_Type is new Account_Type with
      record
         Investment_Vehicle : Investment_Type := Stocks;
      end record;

   type Checking_Account_Type is new Cash_Account_Type with
      record
         Checks_Per_Year  : Positive := 200;
         Interest_Bearing : Boolean  := False;
      end record;

   type Savings_Account_Type is new Cash_Account_Type with
      record
         Kind : Savings_Type := Standard;
      end record;

end CXA9002_0;

---

with Report;
with Ada.Storage_IO;
with Ada.Direct_IO;
with Ada.Tags;
with CXA9002_0;

procedure CXA9002 is
   package Dir_IO is new Ada.Direct_IO (Integer);
   Test_File : Dir_IO.File_Type;
   Incomplete : exception;
begin

   Report.Test ("CXA9002", "Check that the operations defined in the "   &
                           "generic package Ada.Storage_IO provide the " &
                           "ability to store and retrieve objects of "   &
                           "tagged types from in-memory buffers");


   Test_For_Direct_IO_Support:
   begin

      -- The following Create does not have any bearing on the test scenario,
      -- but is included to check that the implementation supports Direct_IO
      -- files.  An exception on this Create statement will raise a Name_Error
      -- or Use_Error, which will be handled to produce a Not_Applicable
      -- result. If created, the file is immediately deleted, as it is not 
      -- needed for the program scenario.

      Dir_IO.Create (Test_File, 
                     Dir_IO.Out_File, 
                     Report.Legal_File_Name(1));
   exception

       when Dir_IO.Use_Error | Dir_IO.Name_Error =>
          Report.Not_Applicable
             ( "Files not supported - Create as Out_File for Direct_IO" );
          raise Incomplete;

   end Test_for_Direct_IO_Support;

   Deletion:
   begin
      Dir_IO.Delete (Test_File);
   exception
      when others =>
         Report.Failed
            ( "Delete not properly implemented for Direct_IO" );
   end Deletion;

   Test_Block:
   declare

      use CXA9002_0; 

      Acct_Filename : constant String := Report.Legal_File_Name(1);
      Cash_Filename : constant String := Report.Legal_File_Name(2);
      Inv_Filename  : constant String := Report.Legal_File_Name(3);
      Chk_Filename  : constant String := Report.Legal_File_Name(4);
      Sav_Filename  : constant String := Report.Legal_File_Name(5);

      type Tag_Pointer_Type is access String;

      TC_Account_Type_Tag,           
      TC_Cash_Account_Type_Tag,      
      TC_Investment_Account_Type_Tag,
      TC_Checking_Account_Type_Tag,  
      TC_Savings_Account_Type_Tag    : Tag_Pointer_Type;

      TC_Account            : Account_Type            := 
                                (Num => "123");

      TC_Cash_Account       : Cash_Account_Type       := 
                                (Num               => "234", 
                                 Years_As_Customer => 3);

      TC_Investment_Account : Investment_Account_Type := 
                                (Num                => "456", 
                                 Investment_Vehicle => Bonds);

      TC_Checking_Account   : Checking_Account_Type   :=
                                (Num               => "567", 
                                 Years_As_Customer => 2,  
                                 Checks_Per_Year   => 300,
                                 Interest_Bearing  => True);

      TC_Savings_Account    : Savings_Account_Type    :=
                                (Num               => "789", 
                                 Years_As_Customer => 14, 
                                 Kind              => Business);
              
      procedure Buffer_Data is

         Account            : Account_Type            := 
                                TC_Account;
         Cash_Account       : Cash_Account_Type       := 
                                TC_Cash_Account;
         Investment_Account : Investment_Account_Type :=
                                TC_Investment_Account;
         Checking_Account   : Checking_Account_Type   :=
                                TC_Checking_Account;
         Savings_Account    : Savings_Account_Type    :=
                                TC_Savings_Account;

         -- The instantiations below are a central point in this test. 
         -- Storage_IO is instantiated for each of the specific tagged
         -- type. These instantiated packages will be used to compress 
         -- tagged objects of these various types into buffers that will 
         -- be written to the Direct_IO files declared below.

         package Acct_SIO is new Ada.Storage_IO (Account_Type);
         package Cash_SIO is new Ada.Storage_IO (Cash_Account_Type);
         package Inv_SIO  is new Ada.Storage_IO (Investment_Account_Type);
         package Chk_SIO  is new Ada.Storage_IO (Checking_Account_Type);
         package Sav_SIO  is new Ada.Storage_IO (Savings_Account_Type);

         -- Direct_IO is instantiated for the buffer types defined in the
         -- instantiated Storage_IO packages.

         package Acct_DIO is new Ada.Direct_IO (Acct_SIO.Buffer_Type);
         package Cash_DIO is new Ada.Direct_IO (Cash_SIO.Buffer_Type);
         package Inv_DIO  is new Ada.Direct_IO (Inv_SIO.Buffer_Type);
         package Chk_DIO  is new Ada.Direct_IO (Chk_SIO.Buffer_Type);
         package Sav_DIO  is new Ada.Direct_IO (Sav_SIO.Buffer_Type);

         Acct_Buffer : Acct_SIO.Buffer_Type;
         Cash_Buffer : Cash_SIO.Buffer_Type;
         Inv_Buffer  : Inv_SIO.Buffer_Type;
         Chk_Buffer  : Chk_SIO.Buffer_Type;
         Sav_Buffer  : Sav_SIO.Buffer_Type;

         Acct_File   : Acct_DIO.File_Type;
         Cash_File   : Cash_DIO.File_Type;
         Inv_File    : Inv_DIO.File_Type;
         Chk_File    : Chk_DIO.File_Type;