"""

Adapter Pattern - converts an interface to fit into another interface so

that both interfaces can work well together. Like the name suggests, the

interface is like an adapter for a 3 pin to 2 pin plug to fit a 2 pin socket.

Example - There are different types of payment methods for purchasing a

a product. However, the different payment processor may have different method

names and different implementation. In this case adapters can be used in

this case.

Note - There are two types of adapter patterns - Object Adapter and Class Adapter

"""

"""

Object Adapter - uses object composition to achieve adaptation

"""

class Payment:

def chargeAccount(self, processor, amount):

print "Paying through " + processor + ": " + str(amount)

class Paypal:

def __init__(self, payment):

self.payment = payment

def sendCash(self, amount):

self.payment.chargeAccount("PayPal", amount)

class Alipay:

def __init__(self, payment):

self.payment = payment

def shouFei(self, amount):

self.payment.chargeAccount("AliPay", amount)

paypalPayment = Paypal(Payment())

paypalPayment.sendCash(5000)

alipayPayment = Alipay(Payment())

alipayPayment.shouFei(5000)

"""

Class Adapter - uses class inheritance to achieve adaptation

"""

class Payment2:

def chargeAccount(self, processor, amount):

print "Paying through " + processor + ": " + str(amount)

class Paypal2(Payment2):

def sendCash(self, amount):

self.chargeAccount("PayPal", amount)

class Alipay2(Payment2):

def shouFei(self, amount):

self.chargeAccount("AliPay", amount)

paypal2Payment = Paypal2()

paypal2Payment.sendCash(5000)