Examples with MongoBatchCursorAdapter com.mongodb.client.internal.MongoBatchCursorAdapter used on opensource projects

Example 1 with MongoBatchCursorAdapter

use of com.mongodb.client.internal.MongoBatchCursorAdapter in project mongo-java-driver by mongodb.

the class DBCollection method aggregate.

/**
 * Method implements aggregation framework.
 *
 * @param pipeline       operations to be performed in the aggregation pipeline
 * @param options        options to apply to the aggregation
 * @param readPreference {@link ReadPreference} to be used for this operation
 * @return the aggregation operation's result set
 * @mongodb.driver.manual core/aggregation-pipeline/ Aggregation
 * @mongodb.server.release 2.2
 */
public Cursor aggregate(final List<? extends DBObject> pipeline, final AggregationOptions options, final ReadPreference readPreference) {
    Cursor result;
    notNull("options", options);
    List<BsonDocument> stages = preparePipeline(pipeline);
    BsonValue outCollection = stages.get(stages.size() - 1).get("$out");
    if (outCollection != null) {
        AggregateToCollectionOperation operation = new AggregateToCollectionOperation(getNamespace(), stages, getReadConcern(), getWriteConcern()).maxTime(options.getMaxTime(MILLISECONDS), MILLISECONDS).allowDiskUse(options.getAllowDiskUse()).bypassDocumentValidation(options.getBypassDocumentValidation()).collation(options.getCollation());
        try {
            executor.execute(operation, getReadPreference(), getReadConcern());
            result = new DBCursor(database.getCollection(outCollection.asString().getValue()), new BasicDBObject(), new DBCollectionFindOptions().readPreference(primary()).collation(options.getCollation()));
        } catch (MongoWriteConcernException e) {
            throw createWriteConcernException(e);
        }
    } else {
        AggregateOperation<DBObject> operation = new AggregateOperation<DBObject>(getNamespace(), stages, getDefaultDBObjectCodec()).maxTime(options.getMaxTime(MILLISECONDS), MILLISECONDS).allowDiskUse(options.getAllowDiskUse()).batchSize(options.getBatchSize()).collation(options.getCollation()).retryReads(retryReads);
        BatchCursor<DBObject> cursor1 = executor.execute(operation, readPreference, getReadConcern());
        result = new MongoCursorAdapter(new MongoBatchCursorAdapter<DBObject>(cursor1));
    }
    return result;
}