text: # Copyright 2010-2012 OpenStack Foundation
  # All Rights Reserved.
  #
  #    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.
  
  """Model classes that form the core of instance flavor functionality."""
  
  
  from novaclient import exceptions as nova_exceptions
  from trove.common import exception
  from trove.common.models import NovaRemoteModelBase
  from trove.common.remote import create_nova_client
  
  
  class Flavor(object):
  
      _data_fields = ['id', 'links', 'name', 'ram', 'vcpus', 'ephemeral']
  
      def __init__(self, flavor=None, context=None, flavor_id=None):
          if flavor:
              self.flavor = flavor
              return
          if flavor_id and context:
              try:
                  client = create_nova_client(context)
                  self.flavor = client.flavors.get(flavor_id)
              except nova_exceptions.NotFound as e:
                  raise exception.NotFound(uuid=flavor_id)
              except nova_exceptions.ClientException as e:
                  raise exception.TroveError(str(e))
              return
          msg = ("Flavor is not defined, and"
                 " context and flavor_id were not specified.")
          raise exception.InvalidModelError(errors=msg)
  
      @property
      def id(self):
          return self.flavor.id
  
      @property
      def name(self):
          return self.flavor.name
  
      @property
      def ram(self):
          return self.flavor.ram
  
      @property
      def vcpus(self):
          return self.flavor.vcpus
  
      @property
      def links(self):
          return self.flavor.links
  
      @property
      def ephemeral(self):
          return self.flavor.ephemeral
  
  
  class Flavors(NovaRemoteModelBase):
  
      def __init__(self, context):
          nova_flavors = create_nova_client(context).flavors.list()
          self.flavors = [Flavor(flavor=item) for item in nova_flavors]
  
      def __iter__(self):
          for item in self.flavors:
              yield item
  