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# libavg - Media Playback Engine.
# Copyright (C) 2003-2014 Ulrich von Zadow
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Current versions can be found at www.libavg.de
import weakref, new
class methodref(object):
# From Python Cookbook
""" Wraps any callable, most importantly a bound method, in a way that allows a bound
method's object to be GC'ed, while providing the same interface as a normal weak
reference."""
def __init__(self, fn):
try:
# Try getting object, function and class
o, f, c = fn.im_self, fn.im_func, fn.im_class
except AttributeError:
# It's not a bound method
self._obj = None
self._func = fn
self._clas = None
if fn:
self.__name__ = fn.__name__
else:
self.__name__ = None
else:
# Bound method
if o is None: # ... actually UN-bound
self._obj = None
self.__name__ = f.__name__
else:
self._obj = weakref.ref(o)
self.__name__ = fn.im_class.__name__ + "." + fn.__name__
self._func = f
self._clas = c
def isSameFunc(self, func):
if self._obj is None:
return func == self._func
elif self._obj() is None:
return func is None
else:
try:
o, f, c = func.im_self, func.im_func, func.im_class
except AttributeError:
return False
else:
return (o == self._obj() and f == self._func and c == self._clas)
def __call__(self):
if self._obj is None:
return self._func
elif self._obj() is None:
return None
return new.instancemethod(self._func, self._obj(), self._clas)
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