lib/core/protocol.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # This file is free software, which comes along with NIT. This software is
   4 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
   5 # without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
   6 # PARTICULAR PURPOSE. You can modify it is you want, provided this header
   7 # is kept unaltered, and a notification of the changes is added.
   8 # You are allowed to redistribute it and sell it, alone or is a part of
   9 # another product.
  10
  11 import stream
  12
  13 # Stream class used as a Decorator over a stream
  14 class Protocol
  15         super Stream
  16
  17         type STREAM: Stream
  18
  19         var origin: STREAM
  20
  21         redef fun close do origin.close
  22 end
  23
  24 # Reader decorator over a read-capable stream
  25 class ReaderProtocol
  26         super Reader
  27         super Protocol
  28
  29         redef type STREAM: Reader
  30
  31         redef fun raw_read_byte do
  32                 return origin.read_byte
  33         end
  34
  35         redef fun raw_read_bytes(ns, len) do
  36                 return origin.read_bytes_to_cstring(ns, len)
  37         end
  38 end
  39
  40 # Writer decorator over a write-capable stream
  41 class WriterProtocol
  42         super Writer
  43         super Protocol
  44
  45         redef type STREAM: Writer
  46
  47         redef fun write_byte(b) do
  48                 origin.write_byte(b)
  49         end
  50
  51         redef fun write_bytes_from_cstring(ns, len) do
  52                 origin.write_bytes_from_cstring(ns, len)
  53         end
  54 end
  55
  56 # Reader/Writer decorator over a duplex-capable stream
  57 class DuplexProtocol
  58         super Duplex
  59         super WriterProtocol
  60         super ReaderProtocol
  61
  62         redef type STREAM: Duplex
  63 end