@Override
public Result getNextBoolean() throws ExecException {
Result r = accumChild(null, DataType.CHARARRAY);
if (r != null) {
return r;
}
Result left, right;
left = lhs.getNextString();
right = rhs.getNextString();
if (left.returnStatus != POStatus.STATUS_OK || left.result == null) return left;
if (right.returnStatus != POStatus.STATUS_OK || right.result == null) return right;
if (impl.match((String) (left.result), (String) (right.result))) {
left.result = Boolean.TRUE;
} else {
left.result = Boolean.FALSE;
}
illustratorMarkup(null, left.result, (Boolean) left.result ? 0 : 1);
return left;
}
@Override
public Result getNextTuple() throws ExecException {
Result res = new Result();
int noItems = inputs.size();
if (inputBags == null) {
accumulateData();
if (!loadLastBag()) {
res.returnStatus = POStatus.STATUS_EOP;
clearMemory();
return res;
}
}
if (its != null) {
// we check if we are done with processing
// we do that by checking if all the iterators are used up
boolean finished = true;
boolean empty = false;
for (int i = 0; i < its.length; i++) {
if (inputBags[i].size() == 0) {
empty = true;
break;
}
finished &= !its[i].hasNext();
}
if (empty) {
// if one bag is empty, there doesn't exist non-null cross product.
// simply clear all the input tuples of the first bag and finish.
int index = inputs.size() - 1;
for (Result resOfLastBag = inputs.get(index).getNextTuple();
resOfLastBag.returnStatus != POStatus.STATUS_EOP;
resOfLastBag = inputs.get(index).getNextTuple()) ;
res.returnStatus = POStatus.STATUS_EOP;
clearMemory();
return res;
} else if (finished && !loadLastBag()) {
res.returnStatus = POStatus.STATUS_EOP;
clearMemory();
return res;
}
}
if (data == null) {
// getNext being called for the first time or starting on new input
// data we instantiate the template array and start populating it
// with data
data = new Tuple[noItems];
data[noItems - 1] = tupleOfLastBag;
for (int i = 0; i < noItems - 1; ++i) {
data[i] = its[i].next();
}
res.result = createTuple(data);
res.returnStatus = POStatus.STATUS_OK;
return res;
} else {
data[noItems - 1] = tupleOfLastBag;
int length = noItems - 1;
for (int index = 0; index < length; ++index) {
if (its[index].hasNext()) {
data[index] = its[index].next();
res.result = createTuple(data);
res.returnStatus = POStatus.STATUS_OK;
return res;
} else {
// reset this index's iterator so cross product can be
// achieved we would be resetting this way only for the
// indexes from the end when the first index which needs to
// be flattened has reached the last element in its
// iterator, we won't come here - instead, we reset all
// iterators at the beginning of this method.
its[index] = (inputBags[index]).iterator();
data[index] = its[index].next();
}
}
res.result = createTuple(data);
res.returnStatus = POStatus.STATUS_OK;
return res;
}
}