class Extended
    constructor: (@subMessageType) ->

    encode: (encoding) ->
        subMessage = @encodeSubMessage(encoding)
        length = subMessage.length + 8
        buffer = new Buffer(length)
        buffer.writeUInt32LE(length | messageTypes.extended, 0)
        buffer.writeUInt32LE(@subMessageType, 4)
        subMessage.copy(buffer, 8)
        buffer

    encodeSubMessage: (encoding) ->
        throw new Error 'Not implemented'

class SetMode extends Extended
    constructor: (@mode) ->
        super extendedMessageTypes.setMode

    encodeSubMessage: (encoding) ->
        buffer = new Buffer(4)
        buffer.writeUInt32LE @mode, 0
        buffer