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  # Copyright 2013 Cloudbase Solutions SRL
  # 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.
  # @author: Claudiu Belu, Cloudbase Solutions Srl
  
  import sys
  
  from oslo.config import cfg
  
  from neutron.openstack.common import log as logging
  from neutron.plugins.hyperv.agent import utils
  from neutron.plugins.hyperv.agent import utilsv2
  
  # Check needed for unit testing on Unix
  if sys.platform == 'win32':
      import wmi
  
  hyper_opts = [
      cfg.BoolOpt('force_hyperv_utils_v1',
                  default=False,
                  help=_('Force V1 WMI utility classes')),
  ]
  
  CONF = cfg.CONF
  CONF.register_opts(hyper_opts, 'hyperv')
  
  LOG = logging.getLogger(__name__)
  
  
  def _get_windows_version():
      return wmi.WMI(moniker='//./root/cimv2').Win32_OperatingSystem()[0].Version
  
  
  def _check_min_windows_version(major, minor, build=0):
      version_str = _get_windows_version()
      return map(int, version_str.split('.')) >= [major, minor, build]
  
  
  def get_hypervutils():
      # V1 virtualization namespace features are supported up to
      # Windows Server / Hyper-V Server 2012
      # V2 virtualization namespace features are supported starting with
      # Windows Server / Hyper-V Server 2012
      # Windows Server / Hyper-V Server 2012 R2 uses the V2 namespace and
      # introduces additional features
  
      force_v1_flag = CONF.hyperv.force_hyperv_utils_v1
      if _check_min_windows_version(6, 3):
          if force_v1_flag:
              LOG.warning(_('V1 virtualization namespace no longer supported on '
                            'Windows Server / Hyper-V Server 2012 R2 or above.'))
          cls = utilsv2.HyperVUtilsV2R2
      elif not force_v1_flag and _check_min_windows_version(6, 2):
          cls = utilsv2.HyperVUtilsV2
      else:
          cls = utils.HyperVUtils
      LOG.debug(_("Loading class: %(module_name)s.%(class_name)s"),
                {'module_name': cls.__module__, 'class_name': cls.__name__})
      return cls()
  