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1 294 jeremybenn
-- C940012.A
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--
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--                             Grant of Unlimited Rights
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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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--     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 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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--     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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--     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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--     to do so.
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--
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--                                    DISCLAIMER
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--
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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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--     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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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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--     PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- OBJECTIVE:
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--      Check that a protected object can have discriminants
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--
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-- TEST DESCRIPTION:
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--      Use a subset of the simulation of the freeway on-ramp described in
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--      c940005.  In this case an array of access types is built with pointers
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--      to successive ramps.  Each ramp has its Ramp_Number specified by
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--      discriminant and this corresponds to the index in the array.  The test
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--      checks that the ramp numbers are assigned as expected then uses calls
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--      to  procedures within the objects (ramps) to verify external calls to
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--      ensure the structures are valid.  The external references within the
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--      protected objects are made via the index into the array.  Routines
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--      which refer to the "previous" ramp and the "next" ramp are exercised.
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--      (Note: The first and last ramps are assumed to be dummies and no
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--      first/last condition code is included)
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--
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--
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-- CHANGE HISTORY:
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--      06 Dec 94   SAIC    ACVC 2.0
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--
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--!
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with Report;
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procedure C940012 is
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   type Ramp_Index is range 1..4;
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   type Ramp;
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   type a_Ramp is access Ramp;
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   Ramp_Array : array (Ramp_Index) of a_Ramp;
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   -- Weighted load given to each potential problem area and accumulated
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   type Load_Factor is range 0..8;
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   Clear_Level    : constant Load_Factor := 0;
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   Moderate_Level : constant Load_Factor := 3;
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   --================================================================
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   -- Only the Routines that are used in this test are shown
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   --
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   protected type Ramp (Ramp_In : Ramp_Index) is
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      function Ramp_Number           return Ramp_Index;
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      function Local_Overload        return Load_Factor;
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      function Next_Ramp_Overload    return Load_Factor;
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      procedure Set_Local_Overload(Sensor_Level : Load_Factor);
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      procedure Notify;
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   private
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      Next_Ramp_Alert : Boolean  := false;  -- Next Ramp is in trouble?
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      -- Current state of the various Sample Points
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      Local_State     : Load_Factor := Clear_Level;
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   end Ramp;
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   --================================================================
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   protected body Ramp is
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      function Ramp_Number return Ramp_Index is
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      begin
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         return Ramp_In;
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      end Ramp_Number;
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      -- These Set/Clear routines are triggered by real-time sensors that
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      -- reflect traffic state
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      procedure Set_Local_Overload(Sensor_Level : Load_Factor) is
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      begin
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         if Local_State = Clear_Level then
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            -- Notify "previous" ramp to check this one for current state.
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            -- Subsequent changes in state will not send an alert
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            -- When the situation clears another routine performs the
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            -- all_clear notification. (not shown)
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            Ramp_Array(Ramp_In - 1).Notify;   -- index to previous ramp
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         end if;
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         Local_State := Sensor_Level;
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         null;   --::::: Start local meter if not already started
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      end;
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      function Local_Overload return Load_Factor is
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      begin
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         return Local_State;
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      end Local_Overload;
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      -- This is notification from the next ramp that it is in
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      -- overload.  With this provision we only need to sample the next
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      -- ramp during adverse conditions.
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      procedure Notify is
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      begin
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         Next_Ramp_Alert := true;
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      end Notify;
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      function Next_Ramp_Overload return Load_Factor is
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      begin
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         if Next_Ramp_Alert then
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            -- Get next ramp's current state
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            return Ramp_Array(Ramp_In + 1).Local_Overload;
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         else
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            return Clear_Level;
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         end if;
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      end Next_Ramp_Overload;
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   end Ramp;
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   --================================================================
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begin
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   Report.Test ("C940012", "Check that a protected object " &
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                        "can have discriminants");
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   -- Build the ramps and populate the ramp array
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   for i in Ramp_Index loop
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      Ramp_Array(i) := new Ramp (i);
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   end loop;
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   -- Test driver.  This is ALL test control code
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   -- Check the assignment of the index
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   for i in Ramp_Index loop
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      if Ramp_Array(i).Ramp_Number /= i then
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         Report.Failed ("Ramp_Number assignment incorrect");
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      end if;
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   end loop;
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   -- Simulate calls to the protected functions and procedures
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   -- external calls. (do not call the "dummy" end ramps)
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   -- Simple Call
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   if Ramp_Array(2).Next_Ramp_Overload /= Clear_level then
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      Report.Failed ("Primary call incorrect");
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   end if;
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   -- Call which results in an external procedure call via the array
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   -- index from within the protected object
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   Ramp_Array(3).Set_Local_Overload (Moderate_Level);
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   -- Call which results in an external function call via the array
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   -- index from within the protected object
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   if Ramp_Array(2).Next_Ramp_Overload /= Moderate_level then
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      Report.Failed ("Secondary call incorrect");
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   end if;
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   Report.Result;
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end C940012;

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