/**
* All headers except collection and database are non available for this operation.
*
* @param exchange
* @throws Exception
*/
protected void doAggregate(Exchange exchange) throws Exception {
DBCollection dbCol = calculateCollection(exchange);
DBObject query = exchange.getIn().getMandatoryBody(DBObject.class);
// Impossible with java driver to get the batch size and number to skip
Iterable<DBObject> dbIterator = null;
AggregationOutput aggregationResult = null;
// Allow body to be a pipeline
// @see http://docs.mongodb.org/manual/core/aggregation/
if (query instanceof BasicDBList) {
BasicDBList queryList = (BasicDBList) query;
aggregationResult =
dbCol.aggregate(
(DBObject) queryList.get(0),
queryList
.subList(1, queryList.size())
.toArray(new BasicDBObject[queryList.size() - 1]));
} else {
aggregationResult = dbCol.aggregate(query);
}
dbIterator = aggregationResult.results();
Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.aggregate);
resultMessage.setBody(dbIterator);
}
