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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_log_hierarchy_id(self):
 """Gets the hierarchy ``Id`` associated with this session. return: (osid.id.Id) - the hierarchy ``Id`` associated with this session *compliance: mandatory -- This method must be implemented.* """

        # Implemented from template for
        # osid.resource.BinHierarchySession.get_bin_hierarchy_id
        if self._catalog_session is not None:
            return self._catalog_session.get_catalog_hierarchy_id()
        return self._hierarchy_session.get_hierarchy_id()