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from clientsimulator.criterion.Criterion import Criterion
from clientsimulator.criterion.Criterion import InvalidCriterionException


class ExclusiveCriterion(Criterion):

    """
    This file describe Exclusive Criterion Behavior

    This types of criterion can only have one value at a time
    """

    def __init__(self):
        super().__init__()
        self.__currentValue = None

    @property
    def currentValue(self):
        return self.__currentValue

    @currentValue.setter
    def currentValue(self, currentValue):
        if currentValue in self._allowedValues or currentValue == self.noValue:
            self.__currentValue = currentValue
        else:
            raise InvalidCriterionException(
                "Value {} is not allowed for {}.".format(
                    currentValue, self.__class__.__name__))

    def __str__(self):
        return self.__class__.__name__ + ' : ' + str(self.__currentValue)