# = ildus/server/backend - generic server backend library
#
# Copyright (C) 2005 Paul van Tilburg <paul@luon.net>
#
# Ildus is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.

require 'singleton'

module Ildus

  class Server

    module Backend
     
      BackendClasses = Hash.new

      class << self

        def load
          path = File.dirname(__FILE__)
          Dir["#{path}/backends/**/*.rb"].each { |file| require file }
        end

        def get(type)
          BackendClasses[type.to_sym]
        end
        alias_method :[], :get

        def register(type, backend_class)
          if BackendClasses.include? type
            raise "type #{type} already registered" 
          end
          BackendClasses[type] = backend_class
        end

      end
  
      class Basic

        def self.inherited(subclass)
          type = subclass.to_s.split('::').last.downcase.to_sym
          Backend.register(type, subclass)
        end

        def hostnames_of(user)
          raise Handler::NotImplementedError
        end

        def add_hostname(user)
          raise Handler::NotImplementedError
        end

        def remove_hostname(user)
          raise Handler::NotImplementedError
        end

        def update_hostname(user, host, addr)
          raise Handler::NotImplementedError
        end

        def add_alias(user, new_alias, host)
          raise Handler::NotImplementedError
        end

        def remove_alias(user, old_alias, host)
          raise Handler::NotImplementedError
        end

      end # class Basic

    end # module Backend

  end # class Server

end # module Ildus