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-- CXACC01.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

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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED

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--*

--

-- OBJECTIVE:

--      Check that the use of 'Class'Output and 'Class'Input allow stream

--      manipulation of objects of non-limited class-wide types.

--

-- TEST DESCRIPTION:

--      This test demonstrates the uses of 'Class'Output and 'Class'Input

--      in moving objects of a particular class to and from a stream file.

--      A procedure uses a class-wide parameter to move objects of specific

--      types in the class to the stream, using the 'Class'Output attribute

--      of the root type of the class.  A function returns a class-wide object,

--      using the 'Class'Input attribute of the root type of the class to

--      extract the object from the stream.

--      A field-by-field comparison of record objects is performed to validate

--      the data read from the stream.  Operator precedence rules are used

--      in the comparison rather than parentheses.

--

-- APPLICABILITY CRITERIA:

--      This test is applicable to all implementations capable of supporting

--      external Stream_IO files.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      14 Nov 95   SAIC    Corrected prefix of 'Tag attribute for ACVC 2.0.1.

--      24 Aug 96   SAIC    Changed a call to "Create" to "Reset".

--      26 Feb 97   CTA.PWB Allowed for non-support of some IO operations.

--!

with FXACC00, Ada.Streams.Stream_IO, Ada.Tags, Report;

procedure CXACC01 is

   Order_File     : Ada.Streams.Stream_IO.File_Type;

   Order_Stream   : Ada.Streams.Stream_IO.Stream_Access;

   Order_Filename : constant String :=

                           Report.Legal_File_Name ( Nam => "CXACC01" );

   Incomplete : exception;

begin

   Report.Test ("CXACC01", "Check that the use of 'Class'Output "        &

                           "and 'Class'Input allow stream manipulation " &

                           "of objects of non-limited class-wide types");

   Test_for_Stream_IO_Support:

   begin

      -- If an implementation does not support Stream_IO in a particular

      -- environment, the exception Use_Error or Name_Error will be raised on

      -- calls to various Stream_IO operations.  This block statement

      -- encloses a call to Create, which should produce an exception in a

      -- non-supportive environment.  These exceptions will be handled to

      -- produce a Not_Applicable result.

      Ada.Streams.Stream_IO.Create (Order_File,

                                    Ada.Streams.Stream_IO.Out_File,

                                    Order_Filename);

   exception

       when Ada.Streams.Stream_IO.Use_Error | Ada.Streams.Stream_IO.Name_Error =>

          Report.Not_Applicable

             ( "Files not supported - Create as Out_File for Stream_IO" );

          raise Incomplete;

   end Test_for_Stream_IO_Support;

   Operational_Test_Block:

   declare

      -- Store tag values associated with objects of tagged types.

      TC_Box_Office_Tag : constant String :=

        Ada.Tags.External_Tag(FXACC00.Ticket_Request'Tag);

      TC_Summer_Tag     : constant String :=

        Ada.Tags.External_Tag(FXACC00.Subscriber_Request'Tag);

      TC_Mayoral_Tag    : constant String :=

        Ada.Tags.External_Tag(FXACC00.VIP_Request'Tag);

      TC_Late_Tag       : constant String :=

        Ada.Tags.External_Tag(FXACC00.Last_Minute_Request'Tag);

         -- The following procedure will take an object of the Ticket_Request

         -- class and output it to the stream.  Objects of any extended type

         -- in the class can be output to the stream with this procedure.

      procedure Order_Entry (Order : FXACC00.Ticket_Request'Class) is

      begin

         FXACC00.Ticket_Request'Class'Output (Order_Stream, Order);

      end Order_Entry;

      -- The following function will retrieve from the stream an object of

      -- the Ticket_Request class.

      function Order_Retrieval return FXACC00.Ticket_Request'Class is

      begin

         return FXACC00.Ticket_Request'Class'Input (Order_Stream);

      end Order_Retrieval;

   begin

      Order_Stream := Ada.Streams.Stream_IO.Stream (Order_File);

      -- Store the data objects in the stream.

      -- Each of the objects is of a different type within the class.

      Order_Entry (FXACC00.Box_Office_Request);     -- Object of root type

      Order_Entry (FXACC00.Summer_Subscription);    -- Obj. of extended type

      Order_Entry (FXACC00.Mayoral_Ticket_Request); -- Obj. of extended type

      Order_Entry (FXACC00.Late_Request);           -- Object of twice

                                                    -- extended type.

      -- Reset mode of stream to In_File prior to reading data from it.

      Reset1:

      begin

         Ada.Streams.Stream_IO.Reset (Order_File,

                                      Ada.Streams.Stream_IO.In_File);

      exception

         when Ada.Streams.Stream_IO.Use_Error =>

            Report.Not_Applicable

               ( "Reset to In_File not supported for Stream_IO - 1" );

            raise Incomplete;

      end Reset1;

      Process_Order_Block:

      declare

         use FXACC00;

         -- Declare variables of the root type class,

         -- and initialize them with class-wide objects returned from

         -- the stream as function result.

         Order_1 : Ticket_Request'Class := Order_Retrieval;

         Order_2 : Ticket_Request'Class := Order_Retrieval;

         Order_3 : Ticket_Request'Class := Order_Retrieval;

         Order_4 : Ticket_Request'Class := Order_Retrieval;

         -- Declare objects of the specific types from within the class

         -- that correspond to the types of the data written to the

         -- stream.  Perform a type conversion on the class-wide objects.

         Ticket_Order      : Ticket_Request :=

                                Ticket_Request(Order_1);

         Subscriber_Order  : Subscriber_Request :=

                                Subscriber_Request(Order_2);

         VIP_Order         : VIP_Request :=

                                VIP_Request(Order_3);

         Last_Minute_Order : Last_Minute_Request :=

                                Last_Minute_Request(Order_4);

      begin

         -- Perform a field-by-field comparison of all the class-wide

         -- objects input from the stream with specific type objects

         -- originally written to the stream.

         if Ticket_Order.Location                /=

            Box_Office_Request.Location          or

            Ticket_Order.Number_Of_Tickets       /=

            Box_Office_Request.Number_Of_Tickets

         then

            Report.Failed ("Ticket_Request object validation failure");

         end if;

         if Subscriber_Order.Location               /=

            Summer_Subscription.Location            or

            Subscriber_Order.Number_Of_Tickets      /=

            Summer_Subscription.Number_Of_Tickets   or

            Subscriber_Order.Subscription_Number    /=

            Summer_Subscription.Subscription_Number

         then

            Report.Failed ("Subscriber_Request object validation failure");

         end if;

         if VIP_Order.Location                       /=

            Mayoral_Ticket_Request.Location          or

            VIP_Order.Number_Of_Tickets              /=

            Mayoral_Ticket_Request.Number_Of_Tickets or

            VIP_Order.Rank                           /=

            Mayoral_Ticket_Request.Rank

         then

            Report.Failed ("VIP_Request object validation failure");

         end if;

         if Last_Minute_Order.Location               /=

            Late_Request.Location                    or

            Last_Minute_Order.Number_Of_Tickets      /=

            Late_Request.Number_Of_Tickets           or

            Last_Minute_Order.Rank                   /=

            Late_Request.Rank                        or

            Last_Minute_Order.Special_Consideration  /=

            Late_Request.Special_Consideration       or

            Last_Minute_Order.Donation               /=

            Late_Request.Donation

         then

            Report.Failed ("Last_Minute_Request object validation failure");

         end if;

         -- Verify tag values from before and after processing.

         -- The 'Tag attribute is used with objects of a class-wide type.

         if TC_Box_Office_Tag /=

            Ada.Tags.External_Tag(Order_1'Tag)

         then

            Report.Failed("Failed tag comparison - 1");

         end if;

         if TC_Summer_Tag /=

            Ada.Tags.External_Tag(Order_2'Tag)

         then

            Report.Failed("Failed tag comparison - 2");

         end if;

         if TC_Mayoral_Tag /=

            Ada.Tags.External_Tag(Order_3'Tag)

         then

            Report.Failed("Failed tag comparison - 3");

         end if;

         if TC_Late_Tag /=

            Ada.Tags.External_Tag(Order_4'Tag)

         then

            Report.Failed("Failed tag comparison - 4");

         end if;

      end Process_Order_Block;

         -- After all the data has been correctly extracted, the file

         -- should be empty.

      if not Ada.Streams.Stream_IO.End_Of_File (Order_File) then

         Report.Failed ("Stream file not empty");

      end if;

   exception

      when Incomplete =>

         raise;

      when Constraint_Error =>

         Report.Failed ("Constraint_Error raised in Operational Block");

      when others =>

         Report.Failed ("Exception raised in Operational Test Block");

   end Operational_Test_Block;

   Deletion:

   begin

      if Ada.Streams.Stream_IO.Is_Open (Order_File) then

         Ada.Streams.Stream_IO.Delete (Order_File);

      else

         Ada.Streams.Stream_IO.Open (Order_File,

                                     Ada.Streams.Stream_IO.Out_File,

                                     Order_Filename);

         Ada.Streams.Stream_IO.Delete (Order_File);

      end if;

   exception

      when others =>

         Report.Failed

            ( "Delete not properly implemented for Stream_IO" );

   end Deletion;

   Report.Result;

exception

   when Incomplete =>

      Report.Result;

   when others     =>

      Report.Failed ( "Unexpected exception" );

      Report.Result;

end CXACC01;