DnsMessageUtil Class — netty Architecture

Source Code

codec-dns/src/main/java/io/netty/handler/codec/dns/DnsMessageUtil.java lines 28–304

final class DnsMessageUtil {

    static StringBuilder appendQuery(StringBuilder buf, DnsQuery query) {
        appendQueryHeader(buf, query);
        appendAllRecords(buf, query);
        return buf;
    }

    static StringBuilder appendResponse(StringBuilder buf, DnsResponse response) {
        appendResponseHeader(buf, response);
        appendAllRecords(buf, response);
        return buf;
    }

    static StringBuilder appendRecordClass(StringBuilder buf, int dnsClass) {
        final String name;
        switch (dnsClass &= 0xFFFF) {
        case DnsRecord.CLASS_IN:
            name = "IN";
            break;
        case DnsRecord.CLASS_CSNET:
            name = "CSNET";
            break;
        case DnsRecord.CLASS_CHAOS:
            name = "CHAOS";
            break;
        case DnsRecord.CLASS_HESIOD:
            name = "HESIOD";
            break;
        case DnsRecord.CLASS_NONE:
            name = "NONE";
            break;
        case DnsRecord.CLASS_ANY:
            name = "ANY";
            break;
        default:
            name = null;
            break;
        }

        if (name != null) {
            buf.append(name);
        } else {
            buf.append("UNKNOWN(").append(dnsClass).append(')');
        }

        return buf;
    }

    private static void appendQueryHeader(StringBuilder buf, DnsQuery msg) {
        buf.append(StringUtil.simpleClassName(msg))
           .append('(');

        appendAddresses(buf, msg)
           .append("id: ")
           .append(msg.id())
           .append(", ")
           .append(msg.opCode());

        if (msg.isRecursionDesired()) {
            buf.append(", RD");
        }
        if (msg.z() != 0) {
            buf.append(", Z: ")
               .append(msg.z());
        }
        buf.append(')');
    }

    private static void appendResponseHeader(StringBuilder buf, DnsResponse msg) {
        buf.append(StringUtil.simpleClassName(msg))
           .append('(');

        appendAddresses(buf, msg)
           .append("id: ")
           .append(msg.id())
           .append(", ")
           .append(msg.opCode())
           .append(", ")
           .append(msg.code())
           .append(',');