text: # Copyright (C) 2012 Nippon Telegraph and Telephone Corporation.
  # Copyright (C) 2011 Isaku Yamahata <yamahata at valinux co jp>
  #
  # 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.
  
  import inspect
  
  from ryu import ofproto
  from ryu import utils
  from . import event
  
  
  class EventOFPMsgBase(event.EventBase):
      def __init__(self, msg):
          super(EventOFPMsgBase, self).__init__()
          self.msg = msg
  
  
  #
  # Create ofp_event type corresponding to OFP Msg
  #
  
  _OFP_MSG_EVENTS = {}
  
  
  def _ofp_msg_name_to_ev_name(msg_name):
      return 'Event' + msg_name
  
  
  def ofp_msg_to_ev(msg):
      name = _ofp_msg_name_to_ev_name(msg.__class__.__name__)
      return _OFP_MSG_EVENTS[name](msg)
  
  
  def _create_ofp_msg_ev_class(msg_cls):
      name = _ofp_msg_name_to_ev_name(msg_cls.__name__)
      # print 'creating ofp_event %s' % name
  
      if name in _OFP_MSG_EVENTS:
          return
  
      cls = type(name, (EventOFPMsgBase,),
                 dict(__init__=lambda self, msg:
                      super(self.__class__, self).__init__(msg)))
      globals()[name] = cls
      _OFP_MSG_EVENTS[name] = cls
  
  
  def _create_ofp_msg_ev_from_module(ofp_praser):
      # print mod
      for _k, cls in inspect.getmembers(ofp_parser, inspect.isclass):
          if not hasattr(cls, 'cls_msg_type'):
              continue
          _create_ofp_msg_ev_class(cls)
  
  
  for ofp_mods in ofproto.get_ofp_modules().values():
      ofp_parser = ofp_mods[1]
      # print 'loading module %s' % ofp_parser
      _create_ofp_msg_ev_from_module(ofp_parser)
  
  
  class EventOFPStateChange(event.EventBase):
      def __init__(self, dp):
          super(EventOFPStateChange, self).__init__()
          self.datapath = dp
  