You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.4 KiB
50 lines
1.4 KiB
6 years ago
|
from datetime import timedelta
|
||
|
|
|
||
|
|
|
||
|
|
class _TzSingleton(type):
|
||
|
|
def __init__(cls, *args, **kwargs):
|
||
|
|
cls.__instance = None
|
||
|
|
super(_TzSingleton, cls).__init__(*args, **kwargs)
|
||
|
|
|
||
|
|
def __call__(cls):
|
||
|
|
if cls.__instance is None:
|
||
|
|
cls.__instance = super(_TzSingleton, cls).__call__()
|
||
|
|
return cls.__instance
|
||
|
|
|
||
|
|
class _TzFactory(type):
|
||
|
|
def instance(cls, *args, **kwargs):
|
||
|
|
"""Alternate constructor that returns a fresh instance"""
|
||
|
|
return type.__call__(cls, *args, **kwargs)
|
||
|
|
|
||
|
|
|
||
|
|
class _TzOffsetFactory(_TzFactory):
|
||
|
|
def __init__(cls, *args, **kwargs):
|
||
|
|
cls.__instances = {}
|
||
|
|
|
||
|
|
def __call__(cls, name, offset):
|
||
|
|
if isinstance(offset, timedelta):
|
||
|
|
key = (name, offset.total_seconds())
|
||
|
|
else:
|
||
|
|
key = (name, offset)
|
||
|
|
|
||
|
|
instance = cls.__instances.get(key, None)
|
||
|
|
if instance is None:
|
||
|
|
instance = cls.__instances.setdefault(key,
|
||
|
|
cls.instance(name, offset))
|
||
|
|
return instance
|
||
|
|
|
||
|
|
|
||
|
|
class _TzStrFactory(_TzFactory):
|
||
|
|
def __init__(cls, *args, **kwargs):
|
||
|
|
cls.__instances = {}
|
||
|
|
|
||
|
|
def __call__(cls, s, posix_offset=False):
|
||
|
|
key = (s, posix_offset)
|
||
|
|
instance = cls.__instances.get(key, None)
|
||
|
|
|
||
|
|
if instance is None:
|
||
|
|
instance = cls.__instances.setdefault(key,
|
||
|
|
cls.instance(s, posix_offset))
|
||
|
|
return instance
|
||
|
|
|