old_contents: # Copyright (c) 2015, Artem Osadchyi
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you 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.
  
  
  class OpenStackEnvException(Exception):
      pass
  
  
  class UnsupportedResourceTypeException(OpenStackEnvException):
      def __init__(self, resource_type):
          super(UnsupportedResourceTypeException, self).__init__()
          self.resource_type = resource_type
  
  
  class ResourceAlreadyExistsException(OpenStackEnvException):
      def __init__(self, resource):
          super(ResourceAlreadyExistsException, self).__init__()
          self.resource = resource
  
  
  class UnsupportedResourceDefinitionTypeException(OpenStackEnvException):
      def __init__(self, path):
          super(UnsupportedResourceDefinitionTypeException, self).__init__()
          self.path = path
  
new_contents: # Copyright (c) 2015, Artem Osadchyi
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you 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.
  
  
  class OpenStackEnvException(Exception):
      pass
  
  
  class UnsupportedResourceTypeException(OpenStackEnvException):
      def __init__(self, resource_type):
          super(UnsupportedResourceTypeException, self).__init__()
          self.resource_type = resource_type
  
  
  class ResourceAlreadyExistsException(OpenStackEnvException):
      def __init__(self, resource):
          super(ResourceAlreadyExistsException, self).__init__()
          self.resource = resource
  
          resource_name = resource.get("name", resource)
          self.message = "Resource \"%s\" already exists!" % resource_name
  
  
  class UnsupportedResourceDefinitionTypeException(OpenStackEnvException):
      def __init__(self, path):
          super(UnsupportedResourceDefinitionTypeException, self).__init__()
          self.message = "Unsupported resource definition source \"%s\"" % path
          self.path = path
  
subject: Add messages to exceptions