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mediator.py
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mediator.py
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import abc
class Country(object):
__metaclass__ = abc.ABCMeta
def __init__(self, un):
self.un = un
def declare(self, m):
self.un.declare(self, m)
@abc.abstractmethod
def get_message(self, m):
pass
class Usa(Country):
def get_message(self, m):
print "USA gets: \"" + m + "\""
class Iraq(Country):
def get_message(self, m):
print "Iraq gets: \"" + m + "\""
class UnitedNations:
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def declare(self, c, m):
pass
class SecurityCouncil(UnitedNations):
def __init__(self):
self.usa = None
self.iraq = None
def declare(self, c, m):
if c == self.usa:
self.iraq.get_message(m)
elif c == self.iraq:
self.usa.get_message(m)
else:
print "err: SecurityCouncil/declare"
if __name__ == "__main__":
security_council = SecurityCouncil()
usa = Usa(security_council)
iraq = Iraq(security_council)
security_council.usa = usa
security_council.iraq = iraq
usa.declare("Stop nuclear weapons")
iraq.declare("No nuclear here")