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-- FDD2A00.A

--

--                             Grant of Unlimited Rights

--

--     The Ada Conformity Assessment Authority (ACAA) holds unlimited

--     rights in the software and documentation contained herein. Unlimited

--     rights are the same as those granted by the U.S. Government for older

--     parts of the Ada Conformity Assessment Test Suite, and are defined

--     in DFAR 252.227-7013(a)(19). By making this public release, the ACAA

--     intends to confer upon all recipients unlimited rights equal to those

--     held by the ACAA. 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.

--

--

-- FOUNDATION DESCRIPTION:

--      This foundation provides the basis for testing user-defined stream

--      attributes. It provides operations which count calls to stream

--      attributes.

--

-- CHANGE HISTORY:

--    30 JUL 2001   PHL   Initial version.

--     5 DEC 2001   RLB   Reformatted for ACATS.

--

with Ada.Streams;

use Ada.Streams;

package FDD2A00 is

    type Kinds is (Read, Write, Input, Output);

    type Counts is array (Kinds) of Natural;

    type My_Stream (Size : Stream_Element_Count) is new Root_Stream_Type with

        record

            First : Stream_Element_Offset := 1;

            Last : Stream_Element_Offset := 0;

            Contents : Stream_Element_Array (1 .. Size);

        end record;

    procedure Clear (Stream : in out My_Stream);

    procedure Read (Stream : in out My_Stream;

                    Item : out Stream_Element_Array;

                    Last : out Stream_Element_Offset);

    procedure Write (Stream : in out My_Stream; Item : in Stream_Element_Array);

    generic

        type T (<>) is limited private;

        with procedure Actual_Write

                          (Stream : access Root_Stream_Type'Class; Item : T);

        with function Actual_Input

                         (Stream : access Root_Stream_Type'Class) return T;

        with procedure Actual_Read (Stream : access Root_Stream_Type'Class;

                                    Item : out T);

        with procedure Actual_Output

                          (Stream : access Root_Stream_Type'Class; Item : T);

    package Counting_Stream_Ops is

        procedure Write (Stream : access Root_Stream_Type'Class; Item : T);

        function Input (Stream : access Root_Stream_Type'Class) return T;

        procedure Read (Stream : access Root_Stream_Type'Class; Item : out T);

        procedure Output (Stream : access Root_Stream_Type'Class; Item : T);

        function Get_Counts return Counts;

    end Counting_Stream_Ops;

end FDD2A00;

package body FDD2A00 is

    procedure Clear (Stream : in out My_Stream) is

    begin

        Stream.First := 1;

        Stream.Last := 0;

    end Clear;

    procedure Read (Stream : in out My_Stream;

                    Item : out Stream_Element_Array;

                    Last : out Stream_Element_Offset) is

    begin

        if Item'Length >= Stream.Last - Stream.First + 1 then

            Item (Item'First .. Item'First + Stream.Last - Stream.First) :=

               Stream.Contents (Stream.First .. Stream.Last);

            Last := Item'First + Stream.Last - Stream.First;

            Stream.First := Stream.Last + 1;

        else

            Item := Stream.Contents (Stream.First ..

                                        Stream.First + Item'Length - 1);

            Last := Item'Last;

            Stream.First := Stream.First + Item'Length;

        end if;

    end Read;

    procedure Write (Stream : in out My_Stream;

                     Item : in Stream_Element_Array) is

    begin

        Stream.Contents (Stream.Last + 1 .. Stream.Last + Item'Length) := Item;

        Stream.Last := Stream.Last + Item'Length;

    end Write;

    package body Counting_Stream_Ops is

        Cnts : Counts := (others => 0);

        procedure Write (Stream : access Root_Stream_Type'Class; Item : T) is

        begin

            Cnts (Write) := Cnts (Write) + 1;

            Actual_Write (Stream, Item);

        end Write;

        function Input (Stream : access Root_Stream_Type'Class) return T is

        begin

            Cnts (Input) := Cnts (Input) + 1;

            return Actual_Input (Stream);

        end Input;

        procedure Read (Stream : access Root_Stream_Type'Class; Item : out T) is

        begin

            Cnts (Read) := Cnts (Read) + 1;

            Actual_Read (Stream, Item);

        end Read;

        procedure Output (Stream : access Root_Stream_Type'Class; Item : T) is

        begin

            Cnts (Output) := Cnts (Output) + 1;

            Actual_Output (Stream, Item);

        end Output;

        function Get_Counts return Counts is

        begin

            return Cnts;

        end Get_Counts;

    end Counting_Stream_Ops;

end FDD2A00;