public void result(
EventBean[] row,
int fromStreamNum,
EventBean myEvent,
Node myNode,
Collection<EventBean[]> resultFinalRows,
EventBean resultRootEvent) {
row[streamNum] = myEvent;
Node parentResultNode = myNode.getParent();
parentNode.result(
row,
streamNum,
myNode.getParentEvent(),
parentResultNode,
resultFinalRows,
resultRootEvent);
// record the fact that an event that was generated by a child
haveChildResults = true;
// If we had more then on result event for this stream, we need to track all the different
// events
// generated by the child node
if (singleResultNode == null) {
completedEvents.add(myEvent);
}
}
public void process(
List<Node>[] result, Collection<EventBean[]> resultFinalRows, EventBean resultRootEvent) {
List<Node> nodes = result[streamNum];
if (nodes == null) {
return;
}
for (Node node : nodes) {
Set<EventBean> events = node.getEvents();
for (EventBean theEvent : events) {
processEvent(theEvent, node, resultFinalRows, resultRootEvent);
}
}
}
private void processEvent(
EventBean theEvent,
Node currentNode,
Collection<EventBean[]> resultFinalRows,
EventBean resultRootEvent) {
EventBean[] row = new EventBean[numStreams];
row[streamNum] = theEvent;
parentNode.result(
row,
streamNum,
currentNode.getParentEvent(),
currentNode.getParent(),
resultFinalRows,
resultRootEvent);
}
public void process(
List<Node>[] result, Collection<EventBean[]> resultFinalRows, EventBean resultRootEvent) {
// there cannot be child nodes to compute a cartesian product if this node had no results
if (resultsForStream == null) {
return;
}
// If this node's result set consisted of a single event
if (singleResultNode != null) {
// If there are no child results, post a row
if (!haveChildResults) {
EventBean[] row = new EventBean[numStreams];
row[streamNum] = singleResultEvent;
parentNode.result(
row,
streamNum,
singleResultNode.getParentEvent(),
singleResultNode,
resultFinalRows,
resultRootEvent);
}
// if there were child results we are done since they have already been posted to the parent
return;
}
// We have multiple events for this node, generate an event row for each event not yet received
// from
// event rows generated by the child node.
for (Node node : resultsForStream) {
Set<EventBean> events = node.getEvents();
for (EventBean theEvent : events) {
if (completedEvents.contains(theEvent)) {
continue;
}
processEvent(theEvent, node, resultFinalRows, resultRootEvent);
}
}
}
public void init(List<Node>[] result) {
resultsForStream = result[streamNum];
singleResultNode = null;
singleResultEvent = null;
haveChildResults = false;
if (resultsForStream != null) {
int numNodes = resultsForStream.size();
if (numNodes == 1) {
Node node = resultsForStream.get(0);
Set<EventBean> nodeEvents = node.getEvents();
// If there is a single result event (typical case)
if (nodeEvents.size() == 1) {
singleResultNode = node;
singleResultEvent = nodeEvents.iterator().next();
}
}
if (singleResultNode == null) {
completedEvents = new HashSet<EventBean>();
}
}
}
