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# coding: UTF-8
# Copyright 2009, 2010 Thomas Jourdan
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import ka_debug
import ka_importer
import os
import sys
import traceback
EXPORT_SIZE = 'export_size'
class Preference(object):
"""
inv: self._preference_dict is not None
"""
_preference = None
def __init__(self):
"""
"""
self._dirty_flag = False
self._first_get = False
self._preference_dict = {}
@staticmethod
def instance():
if Preference._preference is None:
Preference._preference = Preference()
return Preference._preference
def set(self, topic, value):
"""
pre: topic is not None
pre: value is not None
"""
self._dirty_flag = True
self._preference_dict[topic] = value
def get(self, topic):
"""
pre: topic is not None
"""
if not self._first_get:
self._default()
self.recall();
self._first_get = True
return self._preference_dict[topic] if topic in self._preference_dict \
else None
def isDirty(self):
return self._dirty_flag
def _file_name(self):
target_path = ka_importer.get_data_path()
return os.path.join(target_path, 'user_prefereces')
def _default(self):
self._preference_dict = {EXPORT_SIZE: (400, 400)}
def store(self):
"""Write textual content to the file system.
"""
if self._dirty_flag:
out_file = None
fn = ''
try:
fn = self._file_name()
out_file = open(fn, 'w')
out_file.write(repr(self._preference_dict))
self._dirty_flag = False
except:
ka_debug.err('failed writing [%s] [%s] [%s]' % \
(fn, sys.exc_info()[0], sys.exc_info()[1]))
traceback.print_exc(file=sys.__stderr__)
finally:
if out_file:
out_file.close()
def recall(self):
"""
"""
in_file = None
fn = ''
try:
fn = self._file_name()
if os.path.exists(fn):
in_file = open(fn, 'r')
self._preference_dict = eval(in_file.read())
except:
ka_debug.err('failed reading [%s] [%s] [%s]' % \
(fn, sys.exc_info()[0], sys.exc_info()[1]))
traceback.print_exc(file=sys.__stderr__)
finally:
if in_file:
in_file.close()
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