-- CA11017.A
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-- CA11017.A
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--
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--
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-- Grant of Unlimited Rights
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-- Grant of Unlimited Rights
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--
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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-- to do so.
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--
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--
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-- DISCLAIMER
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-- DISCLAIMER
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--
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--*
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--
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--
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-- OBJECTIVE:
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-- OBJECTIVE:
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-- Check that body of the parent package may depend on one of its own
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-- Check that body of the parent package may depend on one of its own
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-- public children.
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-- public children.
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--
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--
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-- TEST DESCRIPTION:
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-- TEST DESCRIPTION:
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-- A scenario is created that demonstrates the potential of adding a
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-- A scenario is created that demonstrates the potential of adding a
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-- public child during code maintenance without distubing a large
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-- public child during code maintenance without distubing a large
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-- subsystem. After child is added to the subsystem, a maintainer
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-- subsystem. After child is added to the subsystem, a maintainer
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-- decides to take advantage of the new functionality and rewrites
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-- decides to take advantage of the new functionality and rewrites
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-- the parent's body.
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-- the parent's body.
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--
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--
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-- Declare a string abstraction in a package which manipulates string
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-- Declare a string abstraction in a package which manipulates string
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-- replacement. Define a parent package which provides operations for
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-- replacement. Define a parent package which provides operations for
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-- a record type with discriminant. Declare a public child of this
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-- a record type with discriminant. Declare a public child of this
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-- package which adds functionality to the original subsystem. In the
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-- package which adds functionality to the original subsystem. In the
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-- parent body, call operations from the public child.
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-- parent body, call operations from the public child.
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--
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--
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-- In the main program, check that operations in the parent and public
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-- In the main program, check that operations in the parent and public
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-- child perform as expected.
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-- child perform as expected.
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--
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--
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--
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--
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-- CHANGE HISTORY:
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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-- 06 Dec 94 SAIC ACVC 2.0
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--
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--
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--!
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--!
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-- Simulates application which manipulates strings.
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-- Simulates application which manipulates strings.
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package CA11017_0 is
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package CA11017_0 is
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type String_Rec (The_Size : positive) is private;
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type String_Rec (The_Size : positive) is private;
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type Substring is new string;
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type Substring is new string;
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-- ... Various other types used by the application.
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-- ... Various other types used by the application.
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procedure Replace (In_The_String : in out String_Rec;
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procedure Replace (In_The_String : in out String_Rec;
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At_The_Position : in positive;
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At_The_Position : in positive;
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With_The_String : in String_Rec);
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With_The_String : in String_Rec);
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-- ... Various other operations used by the application.
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-- ... Various other operations used by the application.
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private
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private
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-- Different size for each individual record.
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-- Different size for each individual record.
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type String_Rec (The_Size : positive) is
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type String_Rec (The_Size : positive) is
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record
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record
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The_Length : natural := 0;
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The_Length : natural := 0;
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The_Content : Substring (1 .. The_Size);
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The_Content : Substring (1 .. The_Size);
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end record;
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end record;
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end CA11017_0;
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end CA11017_0;
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--=================================================================--
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--=================================================================--
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-- Public child added during code maintenance without disturbing a
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-- Public child added during code maintenance without disturbing a
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-- large system. This public child would add functionality to the
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-- large system. This public child would add functionality to the
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-- original system.
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-- original system.
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package CA11017_0.CA11017_1 is
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package CA11017_0.CA11017_1 is
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Position_Error : exception;
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Position_Error : exception;
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function Equal_Length (Left : in String_Rec;
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function Equal_Length (Left : in String_Rec;
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Right : in String_Rec) return boolean;
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Right : in String_Rec) return boolean;
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function Same_Content (Left : in String_Rec;
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function Same_Content (Left : in String_Rec;
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Right : in String_Rec) return boolean;
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Right : in String_Rec) return boolean;
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procedure Copy (From_The_Substring : in Substring;
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procedure Copy (From_The_Substring : in Substring;
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To_The_String : in out String_Rec);
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To_The_String : in out String_Rec);
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-- ... Various other operations used by the application.
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-- ... Various other operations used by the application.
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end CA11017_0.CA11017_1;
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end CA11017_0.CA11017_1;
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--=================================================================--
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--=================================================================--
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package body CA11017_0.CA11017_1 is
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package body CA11017_0.CA11017_1 is
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function Equal_Length (Left : in String_Rec;
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function Equal_Length (Left : in String_Rec;
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Right : in String_Rec) return boolean is
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Right : in String_Rec) return boolean is
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-- Quick comparison between the lengths of the input strings.
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-- Quick comparison between the lengths of the input strings.
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begin
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begin
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return (Left.The_Length = Right.The_Length); -- Parent's private
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return (Left.The_Length = Right.The_Length); -- Parent's private
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-- type.
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-- type.
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end Equal_Length;
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end Equal_Length;
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--------------------------------------------------------------------
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--------------------------------------------------------------------
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function Same_Content (Left : in String_Rec;
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function Same_Content (Left : in String_Rec;
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Right : in String_Rec) return boolean is
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Right : in String_Rec) return boolean is
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begin
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begin
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for I in 1 .. Left.The_Length loop
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for I in 1 .. Left.The_Length loop
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if Left.The_Content (I) = Right.The_Content (I) then
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if Left.The_Content (I) = Right.The_Content (I) then
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return true;
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return true;
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else
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else
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return false;
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return false;
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end if;
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end if;
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end loop;
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end loop;
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end Same_Content;
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end Same_Content;
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--------------------------------------------------------------------
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--------------------------------------------------------------------
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procedure Copy (From_The_Substring : in Substring;
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procedure Copy (From_The_Substring : in Substring;
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To_The_String : in out String_Rec) is
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To_The_String : in out String_Rec) is
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begin
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begin
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To_The_String.The_Content -- Parent's private type.
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To_The_String.The_Content -- Parent's private type.
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(1 .. From_The_Substring'length) := From_The_Substring;
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(1 .. From_The_Substring'length) := From_The_Substring;
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To_The_String.The_Length -- Parent's private type.
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To_The_String.The_Length -- Parent's private type.
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:= From_The_Substring'length;
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:= From_The_Substring'length;
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end Copy;
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end Copy;
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end CA11017_0.CA11017_1;
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end CA11017_0.CA11017_1;
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--=================================================================--
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--=================================================================--
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-- After child is added to the subsystem, a maintainer decides
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-- After child is added to the subsystem, a maintainer decides
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-- to take advantage of the new functionality and rewrites the
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-- to take advantage of the new functionality and rewrites the
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-- parent's body.
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-- parent's body.
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with CA11017_0.CA11017_1;
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with CA11017_0.CA11017_1;
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package body CA11017_0 is
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package body CA11017_0 is
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-- Calls functions from public child for a quick comparison of the
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-- Calls functions from public child for a quick comparison of the
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-- input strings. If their lengths are the same, do the replacement.
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-- input strings. If their lengths are the same, do the replacement.
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procedure Replace (In_The_String : in out String_Rec;
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procedure Replace (In_The_String : in out String_Rec;
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At_The_Position : in positive;
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At_The_Position : in positive;
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With_The_String : in String_Rec) is
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With_The_String : in String_Rec) is
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End_Position : natural := At_The_Position +
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End_Position : natural := At_The_Position +
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With_The_String.The_Length - 1;
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With_The_String.The_Length - 1;
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begin
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begin
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if not CA11017_0.CA11017_1.Equal_Length -- Public child's operation.
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if not CA11017_0.CA11017_1.Equal_Length -- Public child's operation.
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(With_The_String, In_The_String) then
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(With_The_String, In_The_String) then
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raise CA11017_0.CA11017_1.Position_Error;
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raise CA11017_0.CA11017_1.Position_Error;
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-- Public child's exception.
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-- Public child's exception.
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else
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else
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In_The_String.The_Content (At_The_Position .. End_Position) :=
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In_The_String.The_Content (At_The_Position .. End_Position) :=
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With_The_String.The_Content (1 .. With_The_String.The_Length);
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With_The_String.The_Content (1 .. With_The_String.The_Length);
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end if;
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end if;
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end Replace;
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end Replace;
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end CA11017_0;
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end CA11017_0;
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--=================================================================--
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--=================================================================--
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with Report;
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with Report;
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with CA11017_0.CA11017_1; -- Explicit with public child package,
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with CA11017_0.CA11017_1; -- Explicit with public child package,
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-- implicit with parent package (CA11017_0).
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-- implicit with parent package (CA11017_0).
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procedure CA11017 is
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procedure CA11017 is
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package String_Pkg renames CA11017_0;
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package String_Pkg renames CA11017_0;
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use String_Pkg;
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use String_Pkg;
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begin
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begin
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Report.Test ("CA11017", "Check that body of the parent package can " &
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Report.Test ("CA11017", "Check that body of the parent package can " &
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"depend on one of its own public children");
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"depend on one of its own public children");
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-- Both input strings have the same size. Replace the first string by the
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-- Both input strings have the same size. Replace the first string by the
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-- second string.
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-- second string.
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Replace_Subtest:
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Replace_Subtest:
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declare
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declare
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The_First_String, The_Second_String : String_Rec (16);
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The_First_String, The_Second_String : String_Rec (16);
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-- Parent's private type.
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-- Parent's private type.
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The_Position : positive := 1;
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The_Position : positive := 1;
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begin
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begin
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CA11017_1.Copy ("This is the time",
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CA11017_1.Copy ("This is the time",
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To_The_String => The_First_String);
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To_The_String => The_First_String);
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CA11017_1.Copy ("For all good men", The_Second_String);
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CA11017_1.Copy ("For all good men", The_Second_String);
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Replace (The_First_String, The_Position, The_Second_String);
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Replace (The_First_String, The_Position, The_Second_String);
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-- Compare results using function from public child since
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-- Compare results using function from public child since
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-- the type is private.
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-- the type is private.
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if not CA11017_1.Same_Content
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if not CA11017_1.Same_Content
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(The_First_String, The_Second_String) then
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(The_First_String, The_Second_String) then
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Report.Failed ("Incorrect results");
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Report.Failed ("Incorrect results");
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end if;
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end if;
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end Replace_Subtest;
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end Replace_Subtest;
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-- During processing, the application may erroneously attempt to replace
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-- During processing, the application may erroneously attempt to replace
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-- strings of different size. This would result in the raising of an
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-- strings of different size. This would result in the raising of an
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-- exception.
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-- exception.
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Exception_Subtest:
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Exception_Subtest:
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declare
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declare
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The_First_String : String_Rec (17);
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The_First_String : String_Rec (17);
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-- Parent's private type.
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-- Parent's private type.
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The_Second_String : String_Rec (13);
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The_Second_String : String_Rec (13);
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-- Parent's private type.
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-- Parent's private type.
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The_Position : positive := 2;
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The_Position : positive := 2;
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begin
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begin
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CA11017_1.Copy (" ACVC Version 2.0", The_First_String);
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CA11017_1.Copy (" ACVC Version 2.0", The_First_String);
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CA11017_1.Copy (From_The_Substring => "ACVC 9X Basic",
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CA11017_1.Copy (From_The_Substring => "ACVC 9X Basic",
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To_The_String => The_Second_String);
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To_The_String => The_Second_String);
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Replace (The_First_String, The_Position, The_Second_String);
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Replace (The_First_String, The_Position, The_Second_String);
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Report.Failed ("Exception was not raised");
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Report.Failed ("Exception was not raised");
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exception
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exception
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when CA11017_1.Position_Error =>
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when CA11017_1.Position_Error =>
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Report.Comment ("Exception is raised as expected");
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Report.Comment ("Exception is raised as expected");
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end Exception_Subtest;
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end Exception_Subtest;
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Report.Result;
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Report.Result;
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end CA11017;
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end CA11017;
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