private DB extractDatabase() {
		Object dbNameObject = this.cfg.get( Environment.MONGODB_DATABASE );
		if ( dbNameObject == null ) {
			throw log.mongoDbNameMissing();
		}
		String dbName = (String) dbNameObject;
		log.connectingToMongoDatabase( dbName );
		if ( !this.mongo.getDatabaseNames().contains( dbName ) ) {
			log.creatingDatabase( dbName );
		}
		Object usernameObject = this.cfg.get( Environment.MONGODB_USERNAME );
		Object passwordObject = this.cfg.get( Environment.MONGODB_PASSWORD );
		DB db = this.mongo.getDB( dbName );
		if ( usernameObject != null && passwordObject != null ) {
			String username = usernameObject.toString();
			String password = passwordObject.toString();
			boolean  isAuth = db.authenticate( username, password.toCharArray() );
			if(!isAuth){
				log.authenticationfail(username, password);
			}
		}
		return db;
	}