public Object mergeResults(Map<String, Object> results) throws Exception {
if (results.isEmpty()) return null;
// TODO: DELEGATE MERGE AT EVERY COMMAND
final ArrayList<Object> mergedResult = new ArrayList<Object>();
final Object firstResult = results.values().iterator().next();
for (Map.Entry<String, Object> entry : results.entrySet()) {
final String nodeName = entry.getKey();
final Object nodeResult = entry.getValue();
if (nodeResult instanceof Collection) mergedResult.addAll((Collection<?>) nodeResult);
else if (nodeResult instanceof Exception)
// RECEIVED EXCEPTION
throw (Exception) nodeResult;
else mergedResult.add(nodeResult);
}
Object result = null;
if (firstResult instanceof OResultSet) {
// REUSE THE SAME RESULTSET TO AVOID DUPLICATES
((OResultSet) firstResult).clear();
((OResultSet) firstResult).addAll(mergedResult);
result = firstResult;
} else result = new ArrayList<Object>(mergedResult);
return result;
}
