def METHOD_NAME(self) -> None:
    # Check(s)
    if not isinstance(self._path, list):
        assert isinstance(self._path, str)
        assert self._path.endswith(
            ".parquet"
        ), f"Format of input file `{self._path}` is not supported"
    assert (
        self._node_truth is None
    ), "Argument `node_truth` is currently not supported."
    assert (
        self._node_truth_table is None
    ), "Argument `node_truth_table` is currently not supported."
    assert (
        self._string_selection is None
    ), "Argument `string_selection` is currently not supported"
    # Set custom member variable(s)
    if not isinstance(self._path, list):
        self._parquet_hook = ak.from_parquet(self._path, lazy=False)
    else:
        self._parquet_hook = ak.concatenate(
            ak.from_parquet(file) for file in self._path
        )