/usr/lib/python2.7/dist-packages/pycalendar/timezonedb.py is in python-pycalendar 2.0~svn13177-1.
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# Copyright (c) 2011-2012 Cyrus Daboo. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##
from pycalendar.exceptions import PyCalendarNoTimezoneInDatabase, \
PyCalendarInvalidData
import os
class PyCalendarTimezoneDatabase(object):
"""
On demand timezone database cache. This scans a TZdb directory for .ics files matching a
TZID and caches the component data in a calendar from whence the actual component is returned.
"""
sTimezoneDatabase = None
@staticmethod
def createTimezoneDatabase(dbpath):
PyCalendarTimezoneDatabase.sTimezoneDatabase = PyCalendarTimezoneDatabase()
PyCalendarTimezoneDatabase.sTimezoneDatabase.setPath(dbpath)
@staticmethod
def clearTimezoneDatabase():
if PyCalendarTimezoneDatabase.sTimezoneDatabase is not None:
PyCalendarTimezoneDatabase.sTimezoneDatabase.clear()
def __init__(self):
from pycalendar.calendar import PyCalendar
self.dbpath = None
self.calendar = PyCalendar()
def setPath(self, dbpath):
self.dbpath = dbpath
def clear(self):
from pycalendar.calendar import PyCalendar
self.calendar = PyCalendar()
@staticmethod
def getTimezoneDatabase():
if PyCalendarTimezoneDatabase.sTimezoneDatabase is None:
PyCalendarTimezoneDatabase.sTimezoneDatabase = PyCalendarTimezoneDatabase()
return PyCalendarTimezoneDatabase.sTimezoneDatabase
@staticmethod
def getTimezone(tzid):
# Check whether current cached
tzdb = PyCalendarTimezoneDatabase.getTimezoneDatabase()
tz = tzdb.calendar.getTimezone(tzid)
if tz is None:
try:
tzdb.cacheTimezone(tzid)
except PyCalendarNoTimezoneInDatabase:
pass
tz = tzdb.calendar.getTimezone(tzid)
return tz
@staticmethod
def getTimezoneInCalendar(tzid):
"""
Return a VTIMEZONE inside a valid VCALENDAR
"""
tz = PyCalendarTimezoneDatabase.getTimezone(tzid)
if tz is not None:
from pycalendar.calendar import PyCalendar
cal = PyCalendar()
cal.addComponent(tz.duplicate(cal))
return cal
else:
return None
@staticmethod
def getTimezoneOffsetSeconds(tzid, dt, relative_to_utc=False):
# Cache it first
tz = PyCalendarTimezoneDatabase.getTimezone(tzid)
if tz is not None:
return tz.getTimezoneOffsetSeconds(dt, relative_to_utc)
else:
return 0
@staticmethod
def getTimezoneDescriptor(tzid, dt):
# Cache it first
tz = PyCalendarTimezoneDatabase.getTimezone(tzid)
if tz is not None:
return tz.getTimezoneDescriptor(dt)
else:
return ""
def cacheTimezone(self, tzid):
if self.dbpath is None:
return
tzpath = os.path.join(self.dbpath, "%s.ics" % (tzid,))
tzpath = os.path.normpath(tzpath)
if tzpath.startswith(self.dbpath) and os.path.isfile(tzpath):
try:
self.calendar.parseComponent(open(tzpath))
except (IOError, PyCalendarInvalidData):
raise PyCalendarNoTimezoneInDatabase(self.dbpath, tzid)
else:
raise PyCalendarNoTimezoneInDatabase(self.dbpath, tzid)
def addTimezone(self, tz):
copy = tz.duplicate(self.calendar)
self.calendar.addComponent(copy)
@staticmethod
def mergeTimezones(cal, tzs):
"""
Merge each timezone from other calendar.
"""
tzdb = PyCalendarTimezoneDatabase.getTimezoneDatabase()
# Not if our own calendar
if cal is tzdb.calendar:
return
# Merge each timezone from other calendar
for tz in tzs:
tzdb.mergeTimezone(tz)
def mergeTimezone(self, tz):
"""
If the supplied VTIMEZONE is not in our cache then store it in memory.
"""
if self.getTimezone(tz.getID()) is None:
self.addTimezone(tz)
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