def _read(self, directory, filename, session, path, name, extension, spatial, spatialReferenceID, replaceParamFile):
        """
        Private file object read method. Classes that inherit from this base class must implement this method.

        The ``read()`` method that each file object inherits from this base class performs the processes common to all
        file read methods, after which it calls the file object's ``_read()`` (the preceding underscore denotes that
        the method is a private method).

        The purpose of the ``_read()`` method is to perform the file read operations that are specific to the file that
        the file object represents. This method should add any supporting SQLAlchemy objects to the session without
        committing. The common ``read()`` method handles the database commit for all file objects.

        The ``read()`` method processes the user input and passes on the information through the many parameters of the
        ``_read()`` method. As the ``_read()`` method should never be called by the user directly, the arguments will
        be defined in terms of what they offer for the developer of a new file object needing to implement this method.

        Args:
            directory (str): Directory containing the file to be read. Same as given by user in ``read()``.
            filename (str): Name of the file which will be read (e.g.: 'example.prj'). Same as given by user. Same as
                given by user in ``read()``.
            session (:mod:`sqlalchemy.orm.session.Session`): SQLAlchemy session object bound to PostGIS enabled
                database. Same as given by user in ``read()``.
            path (str): Directory and filename combined into the path to the file. This is a convenience parameter.
            name (str): Name of the file without extension. This is a convenience parameter.
            extension (str): Extension of the file without the name. This is a convenience parameter.
            spatial (bool, optional): If True, spatially enabled objects will be read in as PostGIS spatial objects.
                Defaults to False. Same as given by user in ``read()``.
            spatialReferenceID (int, optional): Integer id of spatial reference system for the model. Required if
                spatial is True. Same as given by user in ``read()``.
            replaceParamFile (:class:`gsshapy.orm.ReplaceParamFile`, optional): Handle the case when replacement
                parameters are used in place of normal variables. If this is not None, then the user expects there
                to be replacement variables in the file. Use the gsshapy.lib.parsetools.valueReadPreprocessor() to
                handle these.
        """