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107 lines (83 loc) · 2.62 KB
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#!/usr/bin/env python
# Written by: DGC
import abc
#==============================================================================
class Vehicle(object):
def __init__(self, type_name):
self.type = type_name
self.wheels = None
self.doors = None
self.seats = None
def view(self):
print(
"This vehicle is a " +
self.type +
" with; " +
str(self.wheels) +
" wheels, " +
str(self.doors) +
" doors, and " +
str(self.seats) +
" seats."
)
#==============================================================================
class VehicleBuilder(object):
"""
An abstract builder class, for concrete builders to be derived from.
"""
__metadata__ = abc.ABCMeta
@abc.abstractmethod
def make_wheels(self):
raise
@abc.abstractmethod
def make_doors(self):
raise
@abc.abstractmethod
def make_seats(self):
raise
#==============================================================================
class CarBuilder(VehicleBuilder):
def __init__(self):
self.vehicle = Vehicle("Car ")
def make_wheels(self):
self.vehicle.wheels = 4
def make_doors(self):
self.vehicle.doors = 3
def make_seats(self):
self.vehicle.seats = 5
#==============================================================================
class BikeBuilder(VehicleBuilder):
def __init__(self):
self.vehicle = Vehicle("Bike")
def make_wheels(self):
self.vehicle.wheels = 2
def make_doors(self):
self.vehicle.doors = 0
def make_seats(self):
self.vehicle.seats = 2
#==============================================================================
class VehicleManufacturer(object):
"""
The director class, this will keep a concrete builder.
"""
def __init__(self):
self.builder = None
def create(self):
"""
Creates and returns a Vehicle using self.builder
Precondition: not self.builder is None
"""
assert not self.builder is None, "No defined builder"
self.builder.make_wheels()
self.builder.make_doors()
self.builder.make_seats()
return self.builder.vehicle
#==============================================================================
if (__name__ == "__main__"):
manufacturer = VehicleManufacturer()
manufacturer.builder = CarBuilder()
car = manufacturer.create()
car.view()
manufacturer.builder = BikeBuilder()
bike = manufacturer.create()
bike.view()