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Copy pathlocalproxy.py
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86 lines (72 loc) · 3.29 KB
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#! /usr/bin/env python
#coding=utf-8
# inspired from http://code.activestate.com/recipes/496741-object-proxying/
class Global(object): pass
class LocalProxy(object):
__slots__ = ['_env', '_obj_name']
def __init__(self, environ, name, klass):
object.__setattr__(self, "_env", environ)
object.__setattr__(self, "_obj_name", name)
def __get_instance__(self):
return getattr(self._env, self._obj_name, None)
def __getattr__(self, name):
return getattr(self.__get_instance__(), name)
def __setattr__(self, name, value):
setattr(self.__get_instance__(), name, value)
def __delattr__(self, name):
delattr(self.__get_instance__(), name)
def __nonzero__(self):
return bool(self.__get_instance__())
def __str__(self):
return str(self.__get_instance__())
def __repr__(self):
return repr(self.__get_instance__())
#
# factories
#
_special_names = [
'__abs__', '__add__', '__and__', '__call__', '__cmp__', '__coerce__',
'__contains__', '__delitem__', '__delslice__', '__div__', '__divmod__',
'__eq__', '__float__', '__floordiv__', '__ge__', '__getitem__',
'__getslice__', '__gt__', '__hash__', '__hex__', '__iadd__', '__iand__',
'__idiv__', '__idivmod__', '__ifloordiv__', '__ilshift__', '__imod__',
'__imul__', '__int__', '__invert__', '__ior__', '__ipow__', '__irshift__',
'__isub__', '__iter__', '__itruediv__', '__ixor__', '__le__', '__len__',
'__long__', '__lshift__', '__lt__', '__mod__', '__mul__', '__ne__',
'__neg__', '__oct__', '__or__', '__pos__', '__pow__', '__radd__',
'__rand__', '__rdiv__', '__rdivmod__', '__reduce__', '__reduce_ex__',
'__repr__', '__reversed__', '__rfloorfiv__', '__rlshift__', '__rmod__',
'__rmul__', '__ror__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__',
'__rtruediv__', '__rxor__', '__setitem__', '__setslice__', '__sub__',
'__truediv__', '__xor__', 'next',
]
@classmethod
def _create_class_proxy(cls, theclass):
"""creates a proxy for the given class"""
def make_method(name):
def method(self, *args, **kw):
return getattr(self.__get_instance__(), name)(*args, **kw)
return method
namespace = {}
for name in cls._special_names:
if hasattr(theclass, name):
namespace[name] = make_method(name)
return type("%s(%s)" % (cls.__name__, theclass.__name__), (cls,), namespace)
def __new__(cls, env, name, klass, *args, **kwargs):
"""
creates an proxy instance referencing `obj`. (obj, *args, **kwargs) are
passed to this class' __init__, so deriving classes can define an
__init__ method of their own.
note: _class_proxy_cache is unique per deriving class (each deriving
class must hold its own cache)
"""
try:
cache = cls.__dict__["_class_proxy_cache"]
except KeyError:
cls._class_proxy_cache = cache = {}
try:
theclass = cache[klass]
except KeyError:
cache[klass] = theclass = cls._create_class_proxy(klass)
ins = object.__new__(theclass)
return ins