private void
resolve(Name current, Name suffix) {
	doneCurrent = false;
	Name tname = null;
	if (suffix == null)
		tname = current;
	else {
		try {
			tname = Name.concatenate(current, suffix);
		}
		catch (NameTooLongException e) {
			nametoolong = true;
			return;
		}
	}
	lookup(tname);
}
Sets the minimum credibility level that will be accepted when performing
the lookup.  This defaults to Credibility.NORMAL.
@param credibility The minimum credibility level.
src/main/java/core/org/xbill/DNS/Lookup.java