/*
* Iterate over the Symbol Functions in the Chain:
* - If we are not at the end of the Iterator (i.e. row != null )
* - match the current componentFn
* - if it returns false, then return false
* - otherwise set row to the next row from the Iterator.
* - if we are at the end of the Iterator
* - skip any optional Symbol Fns (star patterns) at the end.
* - but if we come to a non optional Symbol Fn, return false.
* - if we match all Fns in the chain return true.
*/
@Override
protected SymbolFunctionResult match(Object row, PTFPartitionIterator<Object> pItr)
throws HiveException {
SymbolFunctionResult componentResult = null;
for (SymbolFunction sFn : components) {
if (row != null) {
componentResult = sFn.match(row, pItr);
if (!componentResult.matches) {
result.matches = false;
result.nextRow = componentResult.nextRow;
return result;
}
row = pItr.resetToIndex(componentResult.nextRow);
} else {
if (!sFn.isOptional()) {
result.matches = false;
result.nextRow = componentResult.nextRow;
return result;
}
}
}
result.matches = true;
result.nextRow = componentResult.nextRow;
return result;
}
@Override
protected SymbolFunctionResult match(Object row, PTFPartitionIterator<Object> pItr)
throws HiveException {
result.matches = true;
SymbolFunctionResult rowResult = symbolFn.match(row, pItr);
while (rowResult.matches && pItr.hasNext()) {
row = pItr.next();
rowResult = symbolFn.match(row, pItr);
}
result.nextRow = pItr.getIndex();
if (pItr.hasNext()) {
result.nextRow -= 1;
}
return result;
}
public static SymbolFunctionResult match(
SymbolFunction syFn, Object row, PTFPartitionIterator<Object> pItr) throws HiveException {
int resetToIdx = pItr.getIndex() - 1;
try {
return syFn.match(row, pItr);
} finally {
pItr.resetToIndex(resetToIdx);
}
}
@Override
public void execute(PTFPartitionIterator<Object> pItr, PTFPartition outP) throws HiveException {
while (pItr.hasNext()) {
Object iRow = pItr.next();
SymbolFunctionResult syFnRes = SymbolFunction.match(syFn, iRow, pItr);
if (syFnRes.matches) {
int sz = syFnRes.nextRow - (pItr.getIndex() - 1);
Object selectListInput =
MatchPath.getSelectListInput(
iRow, tableDef.getInput().getOutputShape().getOI(), pItr, sz);
ArrayList<Object> oRow = new ArrayList<Object>();
for (ExprNodeEvaluator resExprEval : resultExprInfo.resultExprEvals) {
oRow.add(resExprEval.evaluate(selectListInput));
}
outP.append(oRow);
}
}
}
