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# Copyright 2008-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
import sys
__all__ = ['ObjectProxy']
class ObjectProxy(object):
"""
Object that acts as a proxy to another object, forwarding
attribute accesses and method calls. This can be useful
for implementing lazy initialization.
"""
__slots__ = ()
def _get_target(self):
raise NotImplementedError(self)
def __getattribute__(self, attr):
result = object.__getattribute__(self, '_get_target')()
return getattr(result, attr)
def __setattr__(self, attr, value):
result = object.__getattribute__(self, '_get_target')()
setattr(result, attr, value)
def __call__(self, *args, **kwargs):
result = object.__getattribute__(self, '_get_target')()
return result(*args, **kwargs)
def __setitem__(self, key, value):
object.__getattribute__(self, '_get_target')()[key] = value
def __getitem__(self, key):
return object.__getattribute__(self, '_get_target')()[key]
def __delitem__(self, key):
del object.__getattribute__(self, '_get_target')()[key]
def __contains__(self, key):
return key in object.__getattribute__(self, '_get_target')()
def __iter__(self):
return iter(object.__getattribute__(self, '_get_target')())
def __len__(self):
return len(object.__getattribute__(self, '_get_target')())
def __repr__(self):
return repr(object.__getattribute__(self, '_get_target')())
def __str__(self):
return str(object.__getattribute__(self, '_get_target')())
def __add__(self, other):
return self.__str__() + other
def __hash__(self):
return hash(object.__getattribute__(self, '_get_target')())
def __eq__(self, other):
return object.__getattribute__(self, '_get_target')() == other
def __ne__(self, other):
return object.__getattribute__(self, '_get_target')() != other
def __bool__(self):
return bool(object.__getattribute__(self, '_get_target')())
if sys.hexversion < 0x3000000:
__nonzero__ = __bool__
def __int__(self):
return int(object.__getattribute__(self, '_get_target')())
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