observer_class.py

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from .observersubject_numberproducer import IObserverNumberChanged, INumberProducer
 
 
 
class ObserverForDecimal(IObserverNumberChanged):
 
    
    def __init__(self, numberProducer : INumberProducer) -> None:
        if not numberProducer:
            raise ValueError("The ObserverForDecimal constructor requires a valid INumberProducer object.")
        self._numberProducer = numberProducer
 
    
 
 
    
    def NumberChanged(self) -> None:
        number = self._numberProducer.FetchNumber()
        print("    Decimal    : {0}".format(number))
 
 
 
 
 
 
class ObserverForHexaDecimal(IObserverNumberChanged):
 
    
    def __init__(self, numberProducer : INumberProducer) -> None:
        if not numberProducer:
            raise ValueError("The ObserverForHexaDecimal constructor requires a valid INumberProducer object.")
        self._numberProducer = numberProducer
 
    
 
 
    
    def NumberChanged(self) -> None:
        number = self._numberProducer.FetchNumber()
        print("    Hexadecimal: {0:#08X}".format(number))
 
 
 
 
 
 
class ObserverForBinary(IObserverNumberChanged):
 
    
    def __init__(self, numberProducer : INumberProducer) -> None:
        if not numberProducer:
            raise ValueError("The ObserverForBinary constructor requires a valid INumberProducer object.")
        self._numberProducer = numberProducer
 
    
 
 
    
    def NumberChanged(self) -> None:
        number = self._numberProducer.FetchNumber()
        print("    Binary     : {0:#032b}".format(number))