public void
run(ZoneTransferHandler handler) throws IOException, ZoneTransferException {
	this.handler = handler;
	try {
		openConnection();
		doxfr();
	}
	finally {
		closeConnection();
	}
}
Does the zone transfer.
@param handler The callback object that handles the zone transfer data.
@throws IOException The zone transfer failed to due an IO problem.
@throws ZoneTransferException The zone transfer failed to due a problem
with the zone transfer itself.
src/main/java/core/org/xbill/DNS/ZoneTransferIn.java