class_docstr: FileStorageMixin, applicable to FileXXXStorage
  Subclasses need to have provider_uri, freq, storage_name, file_name attributes
class_docstr_tok: ["FileStorageMixin",",","applicable","to","FileXXXStorage","Subclasses","need","to","have","provider_uri",",","freq",",","storage_name",",","file_name","attributes"]
code: def uri(self) -> Path:
      if self.freq not in self.support_freq:
          raise ValueError(
              f"{self.storage_name}: {self.provider_uri} does not contain data for {self.freq}"
          )
      return self.dpm.get_data_uri(self.freq).joinpath(
          f"{self.storage_name}s", self.file_name
      )
  
imports: import struct
  from pathlib import Path
  from typing import Iterable, Union, Dict, Mapping, Tuple, List
  import numpy
  import pandas
  from qlib.utils.time import Freq
  from qlib.utils.resam import resam_calendar
  from qlib.config import C
  from qlib.data.cache import H
  from qlib.log import get_module_logger
  from qlib.data.storage import CalendarStorage, InstrumentStorage, FeatureStorage, CalVT, InstKT, InstVT
label_desc: Use image node_id 4 for calling the FileStorageMixin obj's underlying member method code with example usage: obj.uri() and returns: self