#format python
""" DecoratorPattern example
"""

class Letter:
    def draw(self):
        raise NotImplementedError
    def send(self):
        print "we are sending it..."

class LetterPrinter(Letter):
    def __init__(self, aName):
        self.name = aName
    def draw(self):
        print "Dear Mr. %s"%self.name
        print "Thank you"
        print
        print "Sincerely Yours, John"

class BorderDecorator(Letter):
    def __init__(self, aDecoratee, width=20):
        self._decoratee = aDecoratee
        self._width = width
    def draw(self):
        print "="*self._width
        self._decoratee.draw()
        print "="*self._width

lforHenry = LetterPrinter('Henry')
lforHenry.draw()
lforHenry.send()

blforHenry = BorderDecorator(lforHenry)
blforHenry.draw()
blforHenry.send()