protected void processIteration(Object[] iterationData)
throws ActivityProcessingException,
ActivityTerminatedException,
ActivityUserException {
TupleListIterator tuples = (TupleListIterator)iterationData[0];
Tuple tuple;
try
{
mOutput.write(ControlBlock.LIST_BEGIN);
List columns = new ArrayList();
ColumnMetadata col0 = new SimpleColumnMetadata("ID", TupleTypes._STRING, 0, 0, 0);