unless defined? $__fsm_system__
  $__fsm_system__ = __FILE__ 

  module FSM 
    FSM::LIBDIR =
      File::dirname(File::expand_path(__FILE__)) + File::SEPARATOR unless
        defined? FSM::LIBDIR

    FSM::INCDIR =
      File::dirname(FSM::LIBDIR) + File::SEPARATOR unless
        defined? FSM::INCDIR

    require INCDIR + 'fsm'

    class System
      include Util

      %w[
        fsm
        observer
      ].each{|a| attr a}

      def initialize fsm = FSM.new, &b
        @fsm = fsm
        @observer = Observer.new @fsm
        @dsl = DSL.new self 
        configure &b if b
      end

      def configure &b
        @dsl.configure &b
      end

      delegate %w[
        graph
        state_attributes
        state
        subscribers
        subscribe
        inspect
        start
        add_observer
        transition
        traverse
        input
        add_state
        add_transition
        plot
        to_dot
        display
      ] => '@fsm'

      delegate %w[
        on
        on_entry
        on_transition
        on_exit
        on_input
        join
        kill
        stop
      ] => '@observer'
    end # class System
  end # module FSM
end