1 files changed, 6 insertions, 3 deletions
diff --git a/src/org/traccar/helper/DistanceCalculator.java b/src/org/traccar/helper/DistanceCalculator.java
index 7ba5044bc..d191a27af 100644
--- a/src/org/traccar/helper/DistanceCalculator.java
+++ b/src/org/traccar/helper/DistanceCalculator.java
@@ -15,7 +15,10 @@
  */
 package org.traccar.helper;
 
-public class DistanceCalculator {
+public final class DistanceCalculator {
+
+    private DistanceCalculator() {
+    }
 
     private static final double EQUATORIAL_EARTH_RADIUS = 6378.1370;
     private static final double DEG_TO_RAD = Math.PI / 180;
@@ -23,8 +26,8 @@ public class DistanceCalculator {
     public static double distance(double lat1, double lon1, double lat2, double lon2) {
         double dlong = (lon2 - lon1) * DEG_TO_RAD;
         double dlat = (lat2 - lat1) * DEG_TO_RAD;
-        double a = Math.pow(Math.sin(dlat / 2), 2) +
-                Math.cos(lat1 * DEG_TO_RAD) * Math.cos(lat2 * DEG_TO_RAD) * Math.pow(Math.sin(dlong / 2), 2);
+        double a = Math.pow(Math.sin(dlat / 2), 2)
+                + Math.cos(lat1 * DEG_TO_RAD) * Math.cos(lat2 * DEG_TO_RAD) * Math.pow(Math.sin(dlong / 2), 2);
         double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
         double d = EQUATORIAL_EARTH_RADIUS * c;
         return d * 1000;