old_contents: # -*- mode: python; indent-tabs-mode: nil -*-
  
  
  class Connection(object):
      """Interface for receiver connections.
  
      A receiver connection is something that can send messages (filter requests,
      multilateration results) to a particular receiver. A single connection
      may handle only a single receiver, or may multiplex multiple receivers.
  
      This is a duck-typed interface, implementations are not required to inherit
      this class as long as they provide methods with equivalent signatures.
      """
  
      def request_traffic(self, receiver, icao_set):
          """Request that a receiver starts sending traffic for the given
          set of aircraft.
  
          receiver: the handle of the concerned receiver
          icao_set: a set of ICAO addresses (as ints) to start sending
          """
          pass
  
      def suppress_traffic(self, receiver, icao_set):
          """Request that a receiver stops sending traffic for the given
          set of aircraft.
  
          receiver: the handle of the concerned receiver
          icao_set: a set of ICAO addresses (as ints) to stop sending
          """
          pass
  
      def report_mlat_position(self, receiver,
                               icao, utc, ecef, ecef_cov, nstations):
          """Report a multilaterated position result.
  
          receiver: the handle of the concerned receiver
          icao: the ICAO address of the aircraft (as an int)
          utc: the approximate validity time of the position
          ecef: an (x,y,z) tuple giving the position in ECEF coordinates
          ecef_cov: a 3x3 matrix giving the covariance matrix of ecef
          nstations: the number of stations that contributed to the result
          """
          pass
  
new_contents: # -*- mode: python; indent-tabs-mode: nil -*-
  
  
  class Connection(object):
      """Interface for receiver connections.
  
      A receiver connection is something that can send messages (filter requests,
      multilateration results) to a particular receiver. A single connection
      may handle only a single receiver, or may multiplex multiple receivers.
  
      This is a duck-typed interface, implementations are not required to inherit
      this class as long as they provide methods with equivalent signatures.
      """
  
      def request_traffic(self, receiver, icao_set):
          """Request that a receiver starts sending traffic for the given
          set of aircraft.
  
          receiver: the handle of the concerned receiver
          icao_set: a set of ICAO addresses (as ints) to start sending
          """
          raise NotImplementedError
  
      def suppress_traffic(self, receiver, icao_set):
          """Request that a receiver stops sending traffic for the given
          set of aircraft.
  
          receiver: the handle of the concerned receiver
          icao_set: a set of ICAO addresses (as ints) to stop sending
          """
          raise NotImplementedError
  
      def report_mlat_position(self, receiver,
                               icao, utc, ecef, ecef_cov, nstations):
          """Report a multilaterated position result.
  
          receiver: the handle of the concerned receiver
          icao: the ICAO address of the aircraft (as an int)
          utc: the approximate validity time of the position
          ecef: an (x,y,z) tuple giving the position in ECEF coordinates
          ecef_cov: a 3x3 matrix giving the covariance matrix of ecef
          nstations: the number of stations that contributed to the result
          """
          raise NotImplementedError
  
subject: Raise NotImplemented if methods aren't overridden