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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
import abc
import inspect
import sys
DeprecatedIn06 = DeprecationWarning
def register_interface(iface):
def register_decorator(klass):
verify_interface(iface, klass)
iface.register(klass)
return klass
return register_decorator
def read_only_property(name):
return property(lambda self: getattr(self, name))
class InterfaceNotImplemented(Exception):
pass
def verify_interface(iface, klass):
for method in iface.__abstractmethods__:
if not hasattr(klass, method):
raise InterfaceNotImplemented(
"{0} is missing a {1!r} method".format(klass, method)
)
if isinstance(getattr(iface, method), abc.abstractproperty):
# Can't properly verify these yet.
continue
spec = inspect.getargspec(getattr(iface, method))
actual = inspect.getargspec(getattr(klass, method))
if spec != actual:
raise InterfaceNotImplemented(
"{0}.{1}'s signature differs from the expected. Expected: "
"{2!r}. Received: {3!r}".format(
klass, method, spec, actual
)
)
def bit_length(x):
if sys.version_info >= (2, 7):
return x.bit_length()
else:
return len(bin(x)) - (2 + (x <= 0))
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