Java ws client support (#651)

zhaomingwork

2023-06-19 293e212128a6d3da9ed95294fe843a20d7da759d

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from abc import ABC
from abc import abstractmethod
from typing import Iterable
from typing import List
 
 
class AbsTokenizer(ABC):
    @abstractmethod
    def text2tokens(self, line: str) -> List[str]:
        raise NotImplementedError
 
    @abstractmethod
    def tokens2text(self, tokens: Iterable[str]) -> str:
        raise NotImplementedError