#!/usr/bin/python
# -*- coding: utf-8 -*-

from __future__ import print_function, unicode_literals

class BaseStorage(object):
    """
    Provides operations on the storage data.
    This class gets subclassed to actually write the data
    to a file, database, whatever.
    """

    data = None

    def open(self):
        """
        When overridden in a subclass,
        closes the persistent storage.
        """
        pass

    def save(self):
        """
        When overriden in a subclass,
        stores the data to a persistent storage.
        """
        pass

    def close(self):
        """
        When overridden in a subclass,
        closes the persistent storage.
        """
        pass