thirdparty/google_appengine/google/appengine/api/yaml_errors.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sat, 06 Dec 2008 16:52:21 +0000
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#!/usr/bin/env python
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#
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# Copyright 2007 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Errors used in the YAML API, which is used by app developers."""
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class Error(Exception):
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  """Base datastore yaml error type."""
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class ProtocolBufferParseError(Error):
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  """Error in protocol buffer parsing"""
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class EmptyConfigurationFile(Error):
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  """Tried to load empty configuration file."""
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class MultipleConfigurationFile(Error):
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  """Tried to load configuration file with multiple objects."""
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class UnexpectedAttribute(Error):
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  """Raised when an unexpected attribute is encounted."""
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class DuplicateAttribute(Error):
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  """Generated when an attribute is assigned to twice."""
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class ListenerConfigurationError(Error):
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  """Generated when there is a parsing problem due to configuration."""
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class IllegalEvent(Error):
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  """Raised when an unexpected event type is received by listener."""
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class InternalError(Error):
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  """Raised when an internal implementation error is detected."""
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class EventListenerError(Error):
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  """Top level exception raised by YAML listener.
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  Any exception raised within the process of parsing a YAML file via an
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  EventListener is caught and wrapped in an EventListenerError.  The causing
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  exception is maintained, but additional useful information is saved which
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  can be used for reporting useful information to users.
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  Attributes:
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    cause: The original exception which caused the EventListenerError.
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  """
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  def __init__(self, cause):
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    """Initialize event-listener error."""
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    if hasattr(cause, 'args') and cause.args:
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      Error.__init__(self, *cause.args)
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    else:
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      Error.__init__(self, str(cause))
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    self.cause = cause
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class EventListenerYAMLError(EventListenerError):
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  """Generated specifically for yaml.error.YAMLError."""
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class EventError(EventListenerError):
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  """Generated specifically when an error occurs in event handler.
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  Attributes:
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    cause: The original exception which caused the EventListenerError.
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    event: Event being handled when exception occured.
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  """
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  def __init__(self, cause, event):
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    """Initialize event-listener error."""
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    EventListenerError.__init__(self, cause)
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    self.event = event
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  def __str__(self):
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    return '%s\n%s' % (self.cause, self.event.start_mark)