Class NoSQL

package net.practice.nosql;

import java.net.UnknownHostException;

import net.practice.api.API;
import net.practice.arenas.Arena;
import org.bukkit.Location;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;

import net.practice.Main;

public class NoSQL {

	private DB database;
	private DBCollection collection;
	private String collectionName = "Arenas";

	@SuppressWarnings({ "resource", "deprecation" })
	public void setUp() throws UnknownHostException {
		MongoClient mongoClient = new MongoClient(new MongoClientURI("mongodb://localhost:27017"));
		database = mongoClient.getDB("FieldPractice");
		collection = database.getCollection(collectionName);
	}

	public void saveArena(Arena arena) {
		DBObject obj = new BasicDBObject("_id", arena.getId()).append("loc1", arena.getLocation1()).append("loc2",
				arena.getLocation2());
		collection.insert(obj);
		database.getMongo().close();
	}

	public void loadArena() {
			DBObject query = new BasicDBObject();
			DBCursor cursor = collection.find(query);
			int number = cursor.length();
			for (int i = 1; i <= number; i++) {
				DBCollection coll = database.getCollection(collectionName);
				DBObject searchById = new BasicDBObject("_id", i);
				DBObject found = coll.findOne(searchById);
				Arena arena;
				if (found != null) {
					arena = new Arena(i, new API().stringToLocation((String) found.get("loc1")), new API().stringToLocation((String) found.get("loc2")), true);
					Main.arena.add(arena);
				}
			}
		database.getMongo().close();
	}

	private void loadArena(Arena arena) {
		DBCollection coll = database.getCollection(collectionName);
		DBObject searchById = new BasicDBObject("_id", arena.getId());
		DBObject found = coll.findOne(searchById);
		if (found != null) {
			arena = new Arena(arena.getId(), new API().stringToLocation((String) found.get("loc1")), new API().stringToLocation((String) found.get("loc2")), true);
			Main.arena.add(arena);
		}
	}

	public void setLocation(Arena arena, Location loc, String nameOfLocation) {
		collection.update(new BasicDBObject("_id", arena.getId()),
				new BasicDBObject("$set", new BasicDBObject(nameOfLocation, new API().locationToString(loc))));
		loadArena(arena);
		database.getMongo().close();
	}

}