@Override
@SuppressWarnings("unchecked")
public void readFields(DataInput in) throws IOException {
this.fst = null;
this.snd = null;
final ClassIndex index = new ClassIndex();
index.readFields(in);
int flags = in.readByte();
try {
if ((flags & FST_NULL) == NOT_NULL) {
fst = (A) index.getClass(in.readByte()).newInstance();
fst.readFields(in);
}
if ((flags & SND_NULL) == NOT_NULL) {
snd = (B) index.getClass(in.readByte()).newInstance();
snd.readFields(in);
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public void readFields(DataInput dataInput) throws IOException {
first.readFields(dataInput);
// System.err.println("read key: " + first);
second.readFields(dataInput);
// System.err.println("read value: " + second);
}