Added missing file

.gitignore

+.DS_Store
+.bsp
+**/*.swp
+data/.DS_Store
+data/ml-100k
+project/project
+project/target
+src/main/scala/project/
+src/main/scala/target/
+target/

src/main/scala/stats/Analyzer.scala

+package stats
+
+import org.rogach.scallop._
+import org.json4s.jackson.Serialization
+import org.apache.spark.rdd.RDD
+
+import org.apache.spark.sql.SparkSession
+import org.apache.log4j.Logger
+import org.apache.log4j.Level
+
+class Conf(arguments: Seq[String]) extends ScallopConf(arguments) {
+  val data = opt[String](required = true)
+  val json = opt[String]()
+  verify()
+}
+
+case class Rating(user: Int, item: Int, rating: Double)
+
+object Analyzer extends App {
+  // Remove these lines if encountering/debugging Spark
+  Logger.getLogger("org").setLevel(Level.OFF)
+  Logger.getLogger("akka").setLevel(Level.OFF)
+  val spark = SparkSession.builder()
+    .master("local[1]")
+    .getOrCreate()
+  spark.sparkContext.setLogLevel("ERROR") 
+
+  println("")
+  println("******************************************************")
+
+  var conf = new Conf(args) 
+  println("Loading data from: " + conf.data()) 
+  val dataFile = spark.sparkContext.textFile(conf.data())
+  val data = dataFile.map(l => {
+      val cols = l.split("\t").map(_.trim)
+      Rating(cols(0).toInt, cols(1).toInt, cols(2).toDouble)
+  }) 
+  assert(data.count == 100000, "Invalid data")
+
+  // Save answers as JSON
+  def printToFile(content: String, 
+                  location: String = "./answers.json") =
+    Some(new java.io.PrintWriter(location)).foreach{
+      f => try{
+        f.write(content)
+      } finally{ f.close }
+  }
+  conf.json.toOption match {
+    case None => ; 
+    case Some(jsonFile) => {
+      var json = "";
+      {
+        // Limiting the scope of implicit formats with {}
+        implicit val formats = org.json4s.DefaultFormats
+        val answers: Map[String, Any] = Map(
+           "3.1.1" -> Map(
+             "global-avg-rating" -> 3.0
+           )
+         )
+        json = Serialization.writePretty(answers)
+      }
+
+      println(json)
+      println("Saving answers in: " + jsonFile)
+      printToFile(json, jsonFile)
+    }
+  }
+
+  println("")
+  spark.close()
+}