55 lines
1.9 KiB
Python
Executable File
55 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python2
|
|
# Terminator by Chris Jones <cmsj@tenshu.net>
|
|
# GPL v2 only
|
|
"""borg.py - We are the borg. Resistance is futile.
|
|
|
|
http://code.activestate.com/recipes/66531/
|
|
ActiveState's policy appears to be that snippets
|
|
exist to encourage re-use, but I can not find any
|
|
specific licencing terms.
|
|
"""
|
|
|
|
from .util import dbg
|
|
|
|
# pylint: disable-msg=R0903
|
|
# pylint: disable-msg=R0921
|
|
class Borg:
|
|
"""Definition of a class that can never be duplicated. Correct usage is
|
|
thus:
|
|
|
|
>>> from borg import Borg
|
|
>>> class foo(Borg):
|
|
... # All attributes on a borg class *must* = None
|
|
... attribute = None
|
|
... def __init__(self):
|
|
... Borg.__init__(self, self.__class__.__name__)
|
|
... def prepare_attributes(self):
|
|
... if not self.attribute:
|
|
... self.attribute = []
|
|
...
|
|
>>> bar = foo()
|
|
>>> bar.prepare_attributes()
|
|
|
|
The important thing to note is that all attributes of borg classes *must* be
|
|
declared as being None. If you attempt to use static class attributes you
|
|
will get unpredicted behaviour. Instead, prepare_attributes() must be called
|
|
which will then see the attributes in the shared state, and initialise them
|
|
if necessary."""
|
|
__shared_state = {}
|
|
|
|
def __init__(self, borgtype=None):
|
|
"""Class initialiser. Overwrite our class dictionary with the shared
|
|
state. This makes us identical to every other instance of this class
|
|
type."""
|
|
if borgtype is None:
|
|
raise TypeError('Borg::__init__: You must pass a borgtype')
|
|
if borgtype not in self.__shared_state:
|
|
dbg('Borg::__init__: Preparing borg state for %s' % borgtype)
|
|
self.__shared_state[borgtype] = {}
|
|
self.__dict__ = self.__shared_state[borgtype]
|
|
|
|
def prepare_attributes(self):
|
|
"""This should be used to prepare any attributes of the borg class."""
|
|
raise NotImplementedError('prepare_attributes')
|
|
|