/*
* Copyright (c) 2008 - 2013 10gen, Inc. <http://10gen.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.tengen;
import com.mongodb.AggregationOutput;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import java.net.UnknownHostException;
public class Week1Homework3 {
public static void main(String[] args) throws UnknownHostException {
MongoClient client = new MongoClient();
DB database = client.getDB("m101");
DBCollection collection = database.getCollection("funnynumbers");
// Not necessary yet to understand this. It's just to prove that you
// are able to run a command on a mongod server
AggregationOutput output =
collection.aggregate(
new BasicDBObject("$group",
new BasicDBObject("_id", "$value")
.append("count", new BasicDBObject("$sum", 1)))
,
new BasicDBObject("$match", new BasicDBObject("count",
new BasicDBObject("$gt", 2))),
new BasicDBObject("$sort", new BasicDBObject("_id", 1))
);
int answer = 0;
for (DBObject doc : output.results()) {
answer += (Double) doc.get("_id");
}
System.out.println("THE ANSWER IS: " + answer);
}
}