transform.py 文件源码

def __init__(self, transformer=None, condition_builder=None,
                 serializer=None, deserializer=None):
        self._transformer = transformer
        if transformer is None:
            self._transformer = ParameterTransformer()

        self._condition_builder = condition_builder
        if condition_builder is None:
            self._condition_builder = ConditionExpressionBuilder()

        self._serializer = serializer
        if serializer is None:
            self._serializer = TypeSerializer()

        self._deserializer = deserializer
        if deserializer is None:
            self._deserializer = TypeDeserializer()