public List
getOptions(int code) {
	if (options == null)
		return Collections.EMPTY_LIST;
	List list = Collections.EMPTY_LIST;
	for (Iterator it = options.iterator(); it.hasNext(); ) {
		EDNSOption opt = (EDNSOption) it.next();
		if (opt.getCode() == code) {
			if (list == Collections.EMPTY_LIST)
				list = new ArrayList();
			list.add(opt);
		}
	}
	return list;
}
Gets all options in the OPTRecord with a specific code.  This returns a list
of EDNSOptions.
src/main/java/core/org/xbill/DNS/OPTRecord.java