old_contents: # -*- coding: utf-8 -*-
  
  # --------------------------------------------------------------------
  # The MIT License (MIT)
  #
  # Copyright (c) 2016 Jonathan Labéjof <jonathan.labejof@gmail.com>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  # --------------------------------------------------------------------
  
  """Middleware class module.
  
  This module provides class tools in order to ease the development of middleware.
  """
  
  __all__ = ['Middleware']
  
  from .core import register
  
  from six import add_metaclass
  
  
  class _MetaMiddleware(type):
      """Handle middleware definition."""
  
      def __init__(cls, name, bases, attrs):
  
          super(_MetaMiddleware, cls).__init__(name, bases, attrs)
  
          register(protocols=cls.protocols(), middleware=cls)
  
  
  @add_metaclass(_MetaMiddleware)
  class Middleware(object):
      """Class to use such as a super class in order to automatically register it
      to specific protocols.
  
      This class is instanciated with uri parameters."""
  
      __protocols__ = []  #: protocol registration definition.
  
      @classmethod
      def protocols(cls):
          """Get all class protocols.
  
          :rtype: set"""
  
          baseclasses = cls.mro()
  
          result = set()
  
          for baseclass in baseclasses:
              if issubclass(baseclass, Middleware):
                  result |= set(baseclass.__protocols__)
  
          return result
  
new_contents: # -*- coding: utf-8 -*-
  
  # --------------------------------------------------------------------
  # The MIT License (MIT)
  #
  # Copyright (c) 2016 Jonathan Labéjof <jonathan.labejof@gmail.com>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  # --------------------------------------------------------------------
  
  """Middleware class module.
  
  This module provides class tools in order to ease the development of middleware.
  """
  
  __all__ = ['Middleware']
  
  from .core import register
  
  from six import add_metaclass
  
  
  class _MetaMiddleware(type):
      """Handle middleware definition."""
  
      def __init__(cls, name, bases, attrs):
  
          super(_MetaMiddleware, cls).__init__(name, bases, attrs)
  
          register(protocols=cls.protocols(), middleware=cls)
  
  
  @add_metaclass(_MetaMiddleware)
  class Middleware(object):
      """Class to use such as a super class in order to automatically register it
      to specific protocols.
  
      This class is instanciated with uri parameters."""
  
      __protocols__ = []  #: protocol registration definition.
  
      @classmethod
      def protocols(cls):
          """Get all class protocols.
  
          :rtype: set"""
  
          baseclasses = cls.mro()
  
          result = set()
  
          for baseclass in baseclasses:
              if hasattr(baseclass, '__protocols__'):
                  result |= set(baseclass.__protocols__)
  
              else:
                  break
  
          return result
  
subject: use of Middleware in class method