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189 lines (151 loc) · 6.2 KB
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# Copyright 2012 the rootpy developers
# distributed under the terms of the GNU General Public License
from __future__ import absolute_import
import types
class MethodProxy(object):
"""
Wrapper object for a method to be called.
"""
def __init__(self, obj, func, name):
self.obj, self.func, self.name = obj, func, name
def __call__(self, *args, **kwds):
return self.obj._method_call(self.name, self.func, *args, **kwds)
class ObjectProxy(object):
__slots__ = ["_obj", "__weakref__"]
def __init__(self, obj):
object.__setattr__(self, "_obj", obj)
def __nonzero__(self):
return bool(object.__getattribute__(self, "_obj"))
def __str__(self):
return str(object.__getattribute__(self, "_obj"))
def __repr__(self):
return repr(object.__getattribute__(self, "_obj"))
#
# 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(object.__getattribute__(self, "_obj"), name)(*args, **kw)
return method
namespace = {}
for name in cls._special_names:
if hasattr(theclass, name) and not hasattr(cls, name):
namespace[name] = make_method(name)
return type("%s(%s)" % (cls.__name__, theclass.__name__), (cls,), namespace)
def __new__(cls, obj, *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[obj.__class__]
except KeyError:
cache[obj.__class__] = theclass = cls._create_class_proxy(obj.__class__)
ins = object.__new__(theclass)
#theclass.__init__(ins, obj, *args, **kwargs)
return ins
def _method_call(self, ___name, ___func, *args, **kwds):
"""
This method gets called before a method is called.
"""
# pre-call hook for all calls.
try:
prefunc = getattr(self, '__pre__')
except AttributeError:
pass
else:
prefunc(___name, *args, **kwds)
# pre-call hook for specific method.
try:
prefunc = getattr(self, '__pre__%s' % ___name)
except AttributeError:
pass
else:
prefunc(*args, **kwds)
# get real method to call and call it
rval = ___func(*args, **kwds)
# post-call hook for specific method.
try:
postfunc = getattr(self, '__post__%s' % ___name, rval)
except AttributeError:
pass
else:
if type(postfunc) in [types.MethodType, types.FunctionType]:
postfunc(*args, **kwds)
# post-call hook for all calls.
try:
postfunc = getattr(self, '__post__', rval)
except AttributeError:
pass
else:
if type(postfunc) is [types.MethodType, types.FunctionType]:
postfunc(___name, *args, **kwds)
return rval
def __setprehook__(self, name, func):
setattr(self, "__pre__%s" % name, func)
def __setposthook__(self, name, func):
setattr(self, "__post__%s" % name, func)
def __delattr__(self, name):
delattr(object.__getattribute__(self, "_obj"), name)
def __setattr__(self, name, value):
if name in ['__setprehook__', '__setposthook__'] or \
name.startswith('__post__') or name.startswith('__pre__'):
object.__setattr__(self, name, value)
else:
setattr(object.__getattribute__(self, "_obj"), name, value)
def __getattribute__(self, name):
"""
Return a proxy wrapper object if this is a method call.
"""
#if name.startswith('_'):
# return object.__getattribute__(self, name)
#else:
if name in ['__setprehook__', '__setposthook__', '_method_call'] \
or name.startswith('__post__') or name.startswith('__pre__'):
return object.__getattribute__(self, name)
att = getattr(object.__getattribute__(self, "_obj"), name)
if type(att) is types.MethodType:
return MethodProxy(self, att, name)
return att
def __getitem__(self, key):
"""
Delegate [] syntax.
"""
name = '__getitem__'
att = getattr(object.__getattribute__(self, "_obj"), name)
pmeth = MethodProxy(self, att, name)
return pmeth(key)
def __setitem__(self, key, value):
"""
Delegate [] syntax.
"""
name = '__setitem__'
att = getattr(object.__getattribute__(self, "_obj"), name)
pmeth = MethodProxy(self, att, name)
pmeth(key, value)