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Aminet 30
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Aminet 30 (1999)(Schatztruhe)[!][Apr 1999].iso
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SmallEiffel.lha
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parking.e
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1998-12-22
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-- This file is part of SmallEiffel The GNU Eiffel Compiler.
-- Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
-- Dominique COLNET and Suzanne COLLIN - colnet@loria.fr
-- http://www.loria.fr/SmallEiffel
-- SmallEiffel is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version. SmallEiffel is distributed in the hope that it will be useful,but
-- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details. You should have received a copy of the GNU General
-- Public License along with SmallEiffel; see the file COPYING. If not,
-- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class PARKING
creation {ANY}
make
feature {ANY}
lower_level: INTEGER is
do
Result := level_list.lower;
end;
upper_level: INTEGER is
do
Result := level_list.upper;
end;
hour_price: REAL;
default_hour_price: REAL is 1.50;
count: INTEGER is
local
i: INTEGER;
do
from
i := lower_level;
until
i > upper_level
loop
Result := Result + level_count(i);
i := i + 1;
end;
end;
clock: DATE;
level_count(number: INTEGER): INTEGER is
require
number <= upper_level;
lower_level <= number;
do
Result := (level_list @ number).count;
ensure
Result >= 0;
end;
feature {ANY} -- Modifications :
make(ll: like level_list) is
require
ll /= Void
do
!!clock.make(0,360);
hour_price := default_hour_price;
level_list := ll;
last_car := 0;
ensure
hour_price = default_hour_price;
level_list = ll;
last_car = 0;
end;
arrival: INTEGER is
-- Gives 0 when no more place.
local
i: INTEGER;
do
from
i := lower_level;
until
(i > upper_level) or else
(not (level_list @ i).full)
loop
i := i + 1;
end;
if (i > upper_level) or else
(level_list @ i).full
then
Result := 0;
else
last_car := last_car + 1;
level_list.item(i).arrival(last_car,clone(clock));
Result := last_car;
end;
ensure
Result >= 0;
end;
departure(car: INTEGER): REAL is
-- Gives the price to pay or -1 when car has already leaved.
require
car > 0;
local
i: INTEGER;
stop: BOOLEAN;
c: like clock;
do
from
i := lower_level;
stop := level_list.count <= 0;
Result := -1;
c := clone(clock);
until
stop
loop
Result := (level_list @ i).departure(car,c,hour_price);
i := i + 1;
stop := (Result >= 0) or (i > upper_level);
end;
end;
add_time(incr: INTEGER) is
do
clock.add_time(incr);
end;
set_hour_price(hp: REAL) is
require
hp >= 0;
do
hour_price := hp;
ensure
hour_price = hp;
end;
feature {NONE}
level_list: ARRAY[LEVEL];
last_car: INTEGER;
invariant
valid_price: hour_price >= 0;
clock /= Void;
last_car >= 0;
level_list /= Void;
end -- PARKING