# -*- coding: utf-8 -*-
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#
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from __future__ import unicode_literals
from builtins import object
from typing import Set
[docs]class WeightRule(object):
DOWNSTREAM = 'downstream'
UPSTREAM = 'upstream'
ABSOLUTE = 'absolute'
_ALL_WEIGHT_RULES = set() # type: Set[str]
@classmethod
def is_valid(cls, weight_rule):
return weight_rule in cls.all_weight_rules()
@classmethod
def all_weight_rules(cls):
if not cls._ALL_WEIGHT_RULES:
cls._ALL_WEIGHT_RULES = {
getattr(cls, attr)
for attr in dir(cls)
if not attr.startswith("_") and not callable(getattr(cls, attr))
}
return cls._ALL_WEIGHT_RULES