@Override
protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
if (log.isDebugEnabled()) log.debug("encode");
if (msg instanceof SipMessage) {
SipMessage m = (SipMessage) msg;
ChannelBuffer header = dynamicBuffer(channel.getConfig().getBufferFactory());
encodeInitialLine(header, m);
encodeHeaders(header, m);
// always add a single white line between headers and content
header.writeByte(CR);
header.writeByte(LF);
ChannelBuffer content = m.getContent();
if (content != null && !content.readable()) {
if (log.isDebugEnabled()) log.debug("no content available");
// no content available
return header;
} else {
if (log.isDebugEnabled()) log.debug("content available");
// TODO write content depending on content type
return wrappedBuffer(header, content);
}
}
// Unknown message type.
return msg;
}
private static void encodeHeaders(ChannelBuffer buf, SipMessage message) {
try {
for (Map.Entry<String, List<String>> header : message.getHeaders().entrySet()) {
encodeHeader(buf, header.getKey(), header.getValue());
}
} catch (UnsupportedEncodingException e) {
throw (Error) new Error().initCause(e);
}
}