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############################################################################## # # Copyright (c) 2002 Zope Foundation and Contributors. # All Rights Reserved. # # This software is subject to the provisions of the Zope Public License, # Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution. # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS # FOR A PARTICULAR PURPOSE. # ############################################################################## """Interface-specific exceptions """ class Invalid(Exception): """A specification is violated """ class DoesNotImplement(Invalid): """ This object does not implement """ def __init__(self, interface): self.interface = interface def __str__(self): return """An object does not implement interface %(interface)s """ % self.__dict__ class BrokenImplementation(Invalid): """An attribute is not completely implemented. """ def __init__(self, interface, name): self.interface=interface self.name=name def __str__(self): return """An object has failed to implement interface %(interface)s The %(name)s attribute was not provided. """ % self.__dict__ class BrokenMethodImplementation(Invalid): """An method is not completely implemented. """ def __init__(self, method, mess): self.method=method self.mess=mess def __str__(self): return """The implementation of %(method)s violates its contract because %(mess)s. """ % self.__dict__ class InvalidInterface(Exception): """The interface has invalid contents """ class BadImplements(TypeError): """An implementation assertion is invalid because it doesn't contain an interface or a sequence of valid implementation assertions. """