python-patterns/chain.py at master · Casperito/python-patterns · GitHub

48 lines (34 loc) · 1.17 KB

# http://www.testingperspective.com/wiki/doku.php/collaboration/chetan/designpatternsinpython/chain-of-responsibilitypattern

class Handler:

def successor(self, successor):

self.successor = successor

class ConcreteHandler1(Handler):

def handle(self, request):

if request > 0 and request <= 10:

print("in handler1")

else:

self.successor.handle(request)

class ConcreteHandler2(Handler):

def handle(self, request):

if request > 10 and request <= 20:

print("in handler2")

else:

self.successor.handle(request)

class ConcreteHandler3(Handler):

def handle(self, request):

if request > 20 and request <= 30:

print("in handler3")

else:

print('end of chain, no handler for {}'.format(request))

class Client:

def __init__(self):

h1 = ConcreteHandler1()

h2 = ConcreteHandler2()

h3 = ConcreteHandler3()

h1.successor(h2)

h2.successor(h3)

requests = [2, 5, 14, 22, 18, 3, 35, 27, 20]

for request in requests:

h1.handle(request)

if __name__ == "__main__":

client = Client()

Expand file tree