from abc import ABC, abstractmethod

class AbstractTokenStore(ABC):

    __tokenCache={}

    def get(self, tokenName):
        if tokenName not in self.__tokenCache:
            self.__tokenCache[tokenName] = self._getToken(tokenName)
        
        if self.__tokenCache[tokenName] is None:
            print("WARNING: Token: "+tokenName+" could not be resolved!")
            return ""

        return self.__tokenCache[tokenName]

    @abstractmethod
    def _getToken(self, name):
        pass