##############################################################################
#
# 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.
"""