-- Copyright (C)2020-2024, Philip Munts dba Munts Technologies.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- * Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
WITH Ada.Containers.Hashed_Maps;
USE TYPE Ada.Containers.Hash_Type;
PACKAGE BODY Sprinkler.Valves IS
-- Simplest numeric index hash
-- From "The Art of Computer Programming, Volume 3" by Donald E. Knuth
FUNCTION Hash(K : ZoneNumber) RETURN Ada.Containers.Hash_Type IS
BEGIN
RETURN Ada.Containers.Hash_Type(K) MOD 1009;
END Hash;
PACKAGE ValveMap IS NEW Ada.Containers.Hashed_Maps(ZoneNumber, Valve, Hash,
"=", "=");
Valves : ValveMap.Map;
-- Register a watering zone valve
PROCEDURE Register(z : ZoneNumber; v : Sprinkler.Valve) IS
BEGIN
IF Valves.Contains(z) THEN
RAISE Error WITH "Zone number has already been registered";
END IF;
Valves.Insert(z, v);
END Register;
-- Look up a watering zone valve
FUNCTION Lookup(z : ZoneNumber) RETURN Sprinkler.Valve IS
BEGIN
IF NOT Valves.Contains(z) THEN
RAISE Error WITH "Zone number has not been registered";
END IF;
RETURN Valves.Element(z);
END Lookup;
END Sprinkler.Valves;