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#
# Copyright (c) 2014 ThoughtWorks, Inc.
#
# Pixelated is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pixelated 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
#
import dbm
import atexit
import os
from pixelated.adapter.tag import Tag
class TagIndex:
"""
Manages an index for mail's tags using a file storage.
"""
DB_PATH = os.path.join(os.environ['HOME'], '.pixelated_index')
__db_instances = dict()
def __init__(self, db_path=DB_PATH):
self.db_path = db_path
if db_path not in TagIndex.__db_instances:
TagIndex.__db_instances[db_path] = dbm.open(db_path, 'c')
self.db = TagIndex.__db_instances[db_path]
atexit.register(self._close_db)
def set(self, tag):
self.db[tag.name] = tag.as_json_string()
def add(self, tag):
if tag.name not in self.db:
self.set(tag)
return tag
def get(self, tag_name):
if tag_name in self.db:
return Tag.from_json_string(self.db.get(tag_name))
else:
return None
def remove(self, tag_name):
if tag_name in self.db:
del self.db[tag_name]
def empty(self):
return len(self.db.keys()) == 0
def values(self):
return set(self.get(key) for key in self.db.keys())
def _close_db(self):
self.db.close()
if self.db_path in TagIndex.__db_instances:
del TagIndex.__db_instances[self.db_path]
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