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# sqlalchemy/inspect.py
# Copyright (C) 2005-2012 the SQLAlchemy authors and contributors <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Base inspect API.
:func:`.inspect` provides access to a contextual object
regarding a subject.
Various subsections of SQLAlchemy,
such as the :class:`.Inspector`, :class:`.Mapper`, and
others register themselves with the "inspection registry" here
so that they may return a context object given a certain kind
of argument.
"""
from . import util
_registrars = util.defaultdict(list)
def inspect(subject):
type_ = type(subject)
for cls in type_.__mro__:
if cls in _registrars:
reg = _registrars[cls]
break
else:
raise exc.InvalidRequestError(
"No inspection system is "
"available for object of type %s" %
type_)
return reg(subject)
def _inspects(*types):
def decorate(fn_or_cls):
for type_ in types:
if type_ in _registrars:
raise AssertionError(
"Type %s is already "
"registered" % type_)
_registrars[type_] = fn_or_cls
return fn_or_cls
return decorate
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