Week4. getAverageByID

Author: SkyrocketStan

Week4/src/FourthRatings.java

@@ -0,0 +1,24 @@
+import java.util.ArrayList;
+
+/**
+ * The week 4 class
+ *
+ * @author Stanislav Rakitov
+ * @version 1.0
+ */
+public class FourthRatings {
+
+  private Double getAverageByID(String movieID, Integer minimalRaters) {
+    ArrayList<Rater> myRaters = RaterDatabase.getRaters();
+    long numOfRatings = myRaters.stream().filter(rater -> rater.hasRating(movieID)).count();
+
+    if (numOfRatings >= minimalRaters) {
+      return myRaters.stream()
+          .filter(rater -> rater.hasRating(movieID))
+          .mapToDouble(rating -> rating.getRating(movieID))
+          .average()
+          .orElse(0.0);
+    }
+    return 0.0;
+  }
+}