MongoClientURI uri = new MongoClientURI(nonOptions.get(0));
if (uri.getDatabase() == null) {
System.err.println("Database missing in MongoDB URI: " + uri.getURI());
System.exit(1);
}
MongoConnection mongo = new MongoConnection(uri.getURI());
DocumentNodeStore store = new DocumentMK.Builder().
setMongoDB(mongo.getDB()).
setClusterId(clusterId.value(options)).getNodeStore();
fixture = new MongoFixture(store);
} else {
fixture = new SegmentFixture(new FileStore(
new File(nonOptions.get(0)), 256));