ca13001.a

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-- CA13001.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 separate protected unit declared in a non-generic child 
--      unit of a private parent have the same visibility into its parent, 
--      its siblings, and packages on which its parent depends as is available 
--      at the point of their declaration.
--
-- TEST DESCRIPTION:
--      A scenario is created that demonstrates the potential of having all
--      members of one family to take out a transportation.  The restriction
--      is depend on each member to determine who can get a car, a clunker, 
--      or a bicycle.  If no transportation is available, that member has to
--      walk.  
--      
--      Declare a package with location for each family member.  Declare
--      a public parent package.  Declare a private child package. Declare a 
--      public grandchild of this private package.  Declare a protected unit 
--      as a subunit in a public grandchild package.  This subunit has 
--      visibility into it's parent body ancestor and its sibling.
--
--      Declare another public parent package.  The body of this package has
--      visibility into its private sibling's descendants.
--
--      In the main program, "with"s the parent package.  Check that the
--      protected subunit performs as expected.  
--
--
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--      16 Nov 95   SAIC    Update and repair for ACVC 2.0.1
--
--!

package CA13001_0 is                    

   type Location is (School, Work, Beach, Home);
   type Family is (Father, Mother, Teen);
   Destination : array (Family) of Location;

   -- Other type definitions and procedure declarations in real application.

end CA13001_0;

-- No bodies required for CA13001_0.

     --==================================================================--

-- Public parent.

package CA13001_1 is                     

   type Transportation is (Bicycle, Clunker, New_Car);
   type Key_Type is private;
   Walking : boolean := false;

   -- Other type definitions and procedure declarations in real application.

private
   type Key_Type 
     is range Transportation'pos(Bicycle) .. Transportation'pos(New_Car);

end CA13001_1;

-- No bodies required for CA13001_1.

     --==================================================================--

-- Private child. 

private package CA13001_1.CA13001_2 is       

   type Transport is
      record
         In_Use : boolean := false;
      end record;
   Vehicles : array (Transportation) of Transport;

   -- Other type definitions and procedure declarations in real application.

end CA13001_1.CA13001_2;

-- No bodies required for CA13001_1.CA13001_2.

     --==================================================================--

-- Public grandchild of a private parent.

package CA13001_1.CA13001_2.CA13001_3 is

   Flat_Tire : array (Transportation) of boolean := (others => false);

   -- Other type definitions and procedure declarations in real application.

end CA13001_1.CA13001_2.CA13001_3;

-- No bodies required for CA13001_1.CA13001_2.CA13001_3.

     --==================================================================--

-- Context clauses required for visibility needed by a separate subunit.

with CA13001_0;                           
use  CA13001_0;

-- Public grandchild of a private parent.

package CA13001_1.CA13001_2.CA13001_4 is

   type Transit is
      record
         Available : boolean := false;
      end record;
   type Keys_Array is array (Transportation) of Transit;
   Fuel : array (Transportation) of boolean := (others => true);

   protected Family_Transportation is

      procedure Get_Vehicle (Who : in     Family;
                             Key :    out Key_Type);
      procedure Return_Vehicle (Tr : in Transportation);
      function TC_Verify (What : Transportation) return boolean;

   private
      Keys : Keys_Array;

   end Family_Transportation;

end CA13001_1.CA13001_2.CA13001_4;

     --==================================================================--

-- Context clause required for visibility needed by a separate subunit.

with CA13001_1.CA13001_2.CA13001_3;    -- Public sibling.

package body CA13001_1.CA13001_2.CA13001_4 is

   protected body Family_Transportation is separate;

end CA13001_1.CA13001_2.CA13001_4;

     --==================================================================--

separate (CA13001_1.CA13001_2.CA13001_4)
protected body Family_Transportation is

   procedure Get_Vehicle (Who : in     Family;
                          Key :    out Key_Type) is
   begin
      case Who is
         when Father|Mother => 
            -- Drive new car to work

            -- Reference package with'ed by the subunit parent's body.
            if Destination(Who) = Work then

               -- Reference type declared in the private parent of the subunit
               -- parent's body.
               -- Reference type declared in the visible part of the 
               -- subunit parent's body.
               if not Vehicles(New_Car).In_Use and Fuel(New_Car) 

                 -- Reference type declared in the public sibling of the 
                 -- subunit parent's body.
                 and not CA13001_1.CA13001_2.CA13001_3.Flat_Tire(New_Car) then
                    Vehicles(New_Car).In_Use := true;

                    -- Reference type declared in the private part of the 
                    -- protected subunit.
                    Keys(New_Car).Available := false;
                    Key                     := Transportation'pos(New_Car);
               else
                 -- Reference type declared in the grandparent of the subunit
                 -- parent's body.
                 Walking := true;
               end if;

            -- Drive clunker to other destinations.
            else
               if not Vehicles(Clunker).In_Use and Fuel(Clunker) and not 
                 CA13001_1.CA13001_2.CA13001_3.Flat_Tire(Clunker) then
                    Vehicles(Clunker).In_Use := true;
                    Keys(Clunker).Available  := false;
                    Key                      := Transportation'pos(Clunker);
               else
                 Walking := true;
                 Key     := Transportation'pos(Bicycle);
               end if;
            end if;
    
         -- Similar for Teen.
         when Teen => 
            if not Vehicles(Clunker).In_Use and Fuel(Clunker) and not 
              CA13001_1.CA13001_2.CA13001_3.Flat_Tire(Clunker) then
                 Vehicles(Clunker).In_Use := true;
                 Keys(Clunker).Available  := false;
                 Key                      := Transportation'pos(Clunker);
            else
               Walking := true;
               Key     := Transportation'pos(Bicycle);
            end if;
      end case;

   end Get_Vehicle;

   ----------------------------------------------------------------

   -- Any family member can bring back the transportation with the key.

   procedure Return_Vehicle (Tr : in Transportation) is
   begin
      Vehicles(Tr).In_Use := false;
      Keys(Tr).Available  := true;
   end Return_Vehicle;

   ----------------------------------------------------------------

   function TC_Verify (What : Transportation) return boolean is
   begin
      return Keys(What).Available;
   end TC_Verify;
   
end Family_Transportation;

     --==================================================================--

with CA13001_0;
use  CA13001_0;

-- Public child.

package CA13001_1.CA13001_5 is

   -- In a real application, tasks could be used to demonstrate 
   -- a family transportation scenario, i.e., each member of
   -- a family can take a vehicle out concurrently, then return
   -- them at the same time. For the purposes of the test, family
   -- transportation happens sequentially.

   procedure Provide_Transportation (Who     : in     Family;
                                     Get_Key :    out Key_Type;
                                     Get_Veh :    out boolean);
   procedure Return_Transportation (What   : in     Transportation;
                                    Rt_Veh :    out boolean);

end CA13001_1.CA13001_5;

     --==================================================================--

with CA13001_1.CA13001_2.CA13001_4;   -- Public grandchild of a private parent,
                                      -- implicitly with CA13001_1.CA13001_2.
package body CA13001_1.CA13001_5 is

   package Transportation_Pkg renames CA13001_1.CA13001_2.CA13001_4;
   use Transportation_Pkg;

   -- These two validation subprograms provide the capability to check the 
   -- components defined in the private packages from within the client 
   -- program.

   procedure Provide_Transportation (Who     : in     Family;
                                     Get_Key :    out Key_Type;
                                     Get_Veh :    out boolean) is
   begin
      -- Goto work, school, or to the beach.
      Family_Transportation.Get_Vehicle (Who, Get_Key);
      if not Family_Transportation.TC_Verify 
        (Transportation'Val(Get_Key)) then
           Get_Veh := true;
      else
         Get_Veh := false;
      end if;

   end Provide_Transportation;

   ----------------------------------------------------------------

   procedure Return_Transportation (What   : in     Transportation;
                                    Rt_Veh :    out boolean) is
   begin
      Family_Transportation.Return_Vehicle (What);
      if Family_Transportation.TC_Verify(What) and 
        not CA13001_1.CA13001_2.Vehicles(What).In_Use then
           Rt_Veh := true;
      else
         Rt_Veh := false;
      end if;

   end Return_Transportation;

end CA13001_1.CA13001_5;

     --==================================================================--

with CA13001_0;
with CA13001_1.CA13001_5;        -- Implicitly with parent, CA13001_1.
with Report;

procedure CA13001 is

   Mommy           : CA13001_0.Family := CA13001_0.Mother;
   Daddy           : CA13001_0.Family := CA13001_0.Father;
   BG              : CA13001_0.Family := CA13001_0.Teen;
   BG_Clunker      : CA13001_1.Transportation := CA13001_1.Clunker;
   Get_Key         : CA13001_1.Key_Type;
   Get_Transit     : boolean := false;
   Return_Transit  : boolean := false;

begin 
   Report.Test ("CA13001", "Check that a protected subunit declared in " & 
                "a child unit of a private parent have the same visibility " &
                "into its parent, its parent's siblings, and packages on " &
                "which its parent depends");

   -- Get transportation for mother to go to work.
   CA13001_0.Destination(CA13001_0.Mother) := CA13001_0.Work;
   CA13001_1.CA13001_5.Provide_Transportation (Mommy, Get_Key, Get_Transit);
   if not Get_Transit then
      Report.Failed ("Failed to get mother transportation");
   end if;

   -- Get transportation for teen to go to school.
   CA13001_0.Destination(CA13001_0.Teen) := CA13001_0.School;
   Get_Transit := false;
   CA13001_1.CA13001_5.Provide_Transportation (BG, Get_Key, Get_Transit);
   if not Get_Transit then
      Report.Failed ("Failed to get teen transportation");
   end if;

   -- Get transportation for father to go to the beach.
   CA13001_0.Destination(CA13001_0.Father) := CA13001_0.Beach;
   Get_Transit := false;
   CA13001_1.CA13001_5.Provide_Transportation (Daddy, Get_Key, Get_Transit);
   if Get_Transit and not CA13001_1.Walking then
      Report.Failed ("Failed to make daddy to walk to the beach");
   end if;

   -- Return the clunker.
   CA13001_1.CA13001_5.Return_Transportation (BG_Clunker, Return_Transit);
   if not Return_Transit then
      Report.Failed ("Failed to get back the clunker");
   end if;

   Report.Result;

end CA13001;