# -*- coding: utf-8 -*-
"""
Created on Thu Mar 29 11:43:05 2018
@author: mz
"""
class Iterator(object):
def Next(self):
pass
def HasNext(self):
pass
def First(self):
pass
def Forward(self):
pass
class CocreteIterator(Iterator):
def __init__(self, aggregate):
self._aggregate = aggregate
def Next(self):
return self._aggregate.Next()
def HasNext(self):
return self._aggregate.HasNext()
def First(self):
return self._aggregate.First()
def Forward(self):
return self._aggregate.Forward()
class Aggregate(object):
def CreateIterator(self):
pass
def Next(self):
pass
def HasNext(self):
pass
def First(self):
pass
def Attach(self, obj):
pass
def Forward(self):
pass
class ConcreteAggregate(object):
def __init__(self):
self._lst = []
self._index = 0
def CreateIterator(self):
return CocreteIterator(self)
def Next(self):
return self._lst[self._index]
def HasNext(self):
return self._index < len(self._lst)
def First(self):
self._index = 0
return self._lst[0]
def Attach(self, obj):
self._lst.append(obj)
def Forward(self):
self._index += 1
if "__main__" == __name__:
aggregate = ConcreteAggregate()
aggregate.Attach(1)
aggregate.Attach("2")
aggregate.Attach("a")
aggregate.Attach("b")
aggregate.Attach("c")
aggregate.Attach("45")
it = aggregate.CreateIterator()
while it.HasNext():
print(it.Next())
it.Forward()
