Put project in order.

Author: gennad

abstractfactory.py

@@ -1,61 +1,65 @@
-class Klass1:
-    """ a very simple obj """
-    def __init__(self):
-        pass
-    def hi(self):
-        print 'hi'
-
-class Factory:
-    """ base factory that can construct objects in a variety of ways:
-            * modules ['package1.subpackage',] to be searched for klass
-            * search global namespace
-            * create takes a arguement of what type of class to return
-            * return a default implementation - subclass must define createDefault()
-    """
-    def __init__(self, modules=[]):
-        self.modules=modules
-
-    def createDefault(self):
-        print dir()
-        raise NotImplementedError
-
-    def create(self, klass=None):
-        import string
-        if klass in globals().keys():
-            if type(globals()[klass]).__name__=='class':
-                return globals()[klass]()
-        for module in self.modules:
-            try:
-                fromlist = []
-                if string.find(module, '.'): fromlist = string.split(module, '.')[:-1]
-                module = __import__(module, globals(), locals(), fromlist)
-                if hasattr(module, klass): return getattr(module, klass)()
-            except AttributeError: pass
-        return self.createDefault()
-
-class MyFactory(Factory):
-    """ concrete factory that specifies:
-        * what modules to search for
-        * implements a createDefault() - which is used if class isnt found
-    """
-    def __init__(self, modules=[]):
-        Factory.__init__(self,modules)
-    def createDefault(self):
-        return Klass1()
-
-
-#--------much simpler one by mark lutz, http://shell.rmi.net/~lutz/talk.html
-def factory(aClass, *args):        # varargs tuple
-    return apply(aClass, args)     # call aClass
-
-class Spam:
-    def doit(self, message):
-        print message
-
-class Person:
-    def __init__(self, name, job):
-        self.name = name
-        self.job  = job
-
-object1 = factory(Spam)
-object2 = factory(Person, "Guido", "guru")
+"""Implementation of the abstract factory pattern"""
+import random
+
+
+class PetShop:
+    """A pet shop"""
+
+    def __init__(self, animal_factory=None):
+        """pet_factory is our abstract factory. We can set it at will."""
+        self.pet_factory = animal_factory
+
+    def show_pet(self):
+        """Creates and shows a pet using the abstract factory"""
+        pet = self.pet_factory.get_pet()
+        print "This is a lovely", pet
+        print "It says", pet.speak()
+        print "It eats", self.pet_factory.get_food()
+
+# Stuff that our factory makes
+
+
+class Dog:
+    def speak(self):
+        return "woof"
+
+    def __str__(self):
+        return "Dog"
+
+
+class Cat:
+    def speak(self):
+        return "meow"
+
+    def __str__(self):
+        return "Cat"
+
+
+# Factory classes
+class DogFactory:
+    def get_pet(self):
+        return Dog()
+
+    def get_food(self):
+        return "dog food"
+
+
+class CatFactory:
+    def get_pet(self):
+        return Cat()
+
+    def get_food(self):
+        return "cat food"
+
+
+# Create the proper family
+def get_factory():
+    """Let's be dynamic!"""
+    return random.choice([DogFactory, CatFactory])()
+
+# Show pets with various factories
+shop = PetShop()
+for i in range(3):
+    shop.pet_factory = get_factory()
+    shop.show_pet()
+    print "=" * 10

adapter.py

@@ -1,20 +1,25 @@
-class Barfooer:
-    def barfoo(self, bar, foo):
-        pass
+class Adaptee:
+    def specific_request(self):
+        return 'Adaptee'
 
-# Per instance, by wrapping and delegation
-class FoobaringWrapper:
-    def __init__(self, wrappee):
-        self.w = wrappee
-    def foobar(self, foo, bar):
-        return self.w.barfoo(bar, foo)
+class Adapter:
+    def __init__(self, adaptee):
+        self.adaptee = adaptee
 
-foobarer = FoobaringWrapper(barfooer)
+    def request(self):
+        return self.adaptee.specific_request()
 
-# Per-classs by subclassing and self-delegation
-class Foobarer(Barfooer):
-    def foobar(self,foo, bar):
-        return self.barfoo(bar, foo)
+client = Adapter(Adaptee())
+print client.request()
 
-foobarer = Foobarer(some, init, params)
+# --------- Second example (by Alex Martelli)------------
 
+class UppercasingFile:
+    def __init__(self, *a, **k):
+        self.f = file(*a, **k)
+
+    def write(self, data):
+        self.f.write(data.upper())
+
+    def __getattr__(self, name):
+        return getattr(self.f, name)

bridge.py

@@ -1,9 +1,60 @@
-class AbstractParser:
-    def __init__(self, scanner):
-        self.scanner = scanner
 
-class ExprParser(AbstractParser):
-    def expr(self):
-        t = self.scanner.next()...
-        self.scanner.push_back(t)...
 
+# Implementor
+class DrawingAPI:
+    def drawCircle(x, y, radius):
+        pass
+
+
+# ConcreteImplementor 1/2
+class DrawingAPI1(DrawingAPI):
+    def drawCircle(self, x, y, radius):
+            print "API1.circle at %f:%f radius %f" % (x, y, radius)
+
+
+# ConcreteImplementor 2/2
+class DrawingAPI2(DrawingAPI):
+    def drawCircle(self, x, y, radius):
+            print "API2.circle at %f:%f radius %f" % (x, y, radius)
+
+
+# Abstraction
+class Shape:
+    # Low-level
+    def draw(self):
+        pass
+
+    # High-level
+    def resizeByPercentage(self, pct):
+        pass
+
+
+# Refined Abstraction
+class CircleShape(Shape):
+    def __init__(self, x, y, radius, drawingAPI):
+        self.__x = x
+        self.__y = y
+        self.__radius = radius
+        self.__drawingAPI = drawingAPI
+
+    # low-level i.e. Implementation specific
+    def draw(self):
+        self.__drawingAPI.drawCircle(self.__x, self.__y, self.__radius)
+
+    # high-level i.e. Abstraction specific
+    def resizeByPercentage(self, pct):
+        self.__radius *= pct
+
+
+def main():
+    shapes = [
+        CircleShape(1, 2, 3, DrawingAPI1()),
+        CircleShape(5, 7, 11, DrawingAPI2())
+    ]
+
+    for shape in shapes:
+        shape.resizeByPercentage(2.5)
+        shape.draw()
+
+if __name__ == "__main__":
+    main()

chainofresp.py

@@ -0,0 +1,44 @@
+class Car:
+    def __init__(self):
+        self.name = None
+        self.km = 11100
+        self.fuel = 5
+        self.oil = 5
+
+
+def handle_fuel(car):
+    if car.fuel < 10:
+        print "added fuel"
+        car.fuel = 100
+
+
+def handle_km(car):
+    if car.km > 10000:
+        print "made a car test."
+        car.km = 0
+
+
+def handle_oil(car):
+    if car.oil < 10:
+        print "Added oil"
+        car.oil = 100
+
+
+class Garage:
+    def __init__(self):
+        self.handlers = []
+
+    def add_handler(self, handler):
+        self.handlers.append(handler)
+
+    def handle_car(self, car):
+        for handler in self.handlers:
+            handler(car)
+
+if __name__ == '__main__':
+    handlers = [handle_fuel, handle_km, handle_oil]
+    garage = Garage()
+
+    for handle in handlers:
+        garage.add_handler(handle)
+    garage.handle_car(Car())

closure.py

@@ -6,10 +6,6 @@ def dfdx(x):
 def f(x):
     return 3*x**2+x
 
-"""
->>> print f(1.0)
-4.0
->>> print Dx(f, 0.01)(1.0)
-7.03
->>> print Dx(Dx(f, 0.01), 0.01)(1.0)
-"""
+print f(1.0) # 4.0
+print Dx(f, 0.01)(1.0) # 7.03
+print Dx(Dx(f, 0.01), 0.01)(1.0)