public CoapMessage respond()

in coap/src/main/java/org/apache/mina/coap/resource/ResourceRegistry.java [63:103]
35 lines of code
8 McCabe index (conditional complexity)

    public CoapMessage respond(CoapMessage request, IoSession session) {
        // find the URI
        StringBuilder urlBuilder = new StringBuilder("");
        for (CoapOption opt : request.getOptions()) {
            if (opt.getType() == CoapOptionType.URI_PATH) {
                if (urlBuilder.length() > 0) {
                    urlBuilder.append("/");
                }
                urlBuilder.append(new String(opt.getData()));
            }
        }

        String url = urlBuilder.toString();
        LOG.debug("requested URL : {}", url);

        if (url.length() < 1) {
            // 4.00 !
            return new CoapMessage(1, MessageType.ACK, CoapCode.BAD_REQUEST.getCode(), request.getId(),
                    request.getToken(), new CoapOption[] { new CoapOption(CoapOptionType.CONTENT_FORMAT,
                            new byte[] { 0 }) }, "no URL !".getBytes());
        }
        if (".well-known/core".equalsIgnoreCase(url)) {
            // discovery !
            return new CoapMessage(1, MessageType.ACK, CoapCode.CONTENT.getCode(), request.getId(), request.getToken(),
                    new CoapOption[] { new CoapOption(CoapOptionType.CONTENT_FORMAT, new byte[] { 40 }) },
                    getDiscovery());
        } else {
            ResourceHandler handler = handlers.get(url);
            if (handler == null) {
                // 4.04 !
                return new CoapMessage(1, MessageType.ACK, CoapCode.NOT_FOUND.getCode(), request.getId(),
                        request.getToken(), new CoapOption[] { new CoapOption(CoapOptionType.CONTENT_FORMAT,
                                new byte[] { 0 }) }, "not found !".getBytes());
            } else {
                CoapResponse response = handler.handle(request, session);
                return new CoapMessage(1, request.getType() == MessageType.CONFIRMABLE ? MessageType.ACK
                        : MessageType.NON_CONFIRMABLE, response.getCode(), request.getId(), request.getToken(),
                        response.getOptions(), response.getContent());
            }
        }
    }