public void handleRecord(Record r) {
		List list;
		if (ixfr != null) {
			Delta delta = (Delta) ixfr.get(ixfr.size() - 1);
			if (delta.adds.size() > 0)
				list = delta.adds;
			else
				list = delta.deletes;
		} else
			list = axfr;
		list.add(r);
	}
Called for each content record in an AXFR.
@param r The DNS record.
src/main/java/core/org/xbill/DNS/ZoneTransferIn.java