# RozK

from .codec import NullCodec

class NullStream:
    @property
    def index(self):
        return -1

    @property
    def codec(self):
        return NullCodec()

    def contains(self, packet):
        return False

class Stream:
    __slots__ = 'index', 'codec'

    def __init__(self, index, codec):
        self.index = index
        self.codec = codec

    def contains(self, packet):
        return (self.index == packet.stream_index)