# Copyright 2015  Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=


import yaml


class InformationStore(object):

    attrs = []

    def __init__(self):
        self._filename = None
        for attr in self.attrs:
            setattr(self, attr, None)

    def set_filename(self, filename):
        self._filename = filename

    def save(self):
        obj = {}
        for attr in self.attrs:
            obj[attr] = getattr(self, attr)
        with open(self._filename, 'w') as f:
            yaml.safe_dump(obj, stream=f, default_flow_style=False, indent=4)

    def load(self):
        with open(self._filename) as f:
            obj = yaml.safe_load(f)
        for attr in self.attrs:
            setattr(self, attr, obj.get(attr))