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class DetectorRuleBase:
    """
    Base class for rule expression
    """

    def validate(self):
        """
        return a list of error messages if not valid. Return None if valid
        :return:
        """
        raise NotImplementedError

    @property
    def rule_id(self):
        raise NotImplementedError

    @property
    def description(self):
        raise NotImplementedError

    @property
    def outcomes(self):
        raise NotImplementedError

    def get_rule_expression(self):
        """
        Returns a rule expression
        :return:
        """
        raise NotImplementedError