[commons] Return murmur2 hash as long

src/main/java/io/gitlab/jfronny/commons/HashUtils.java

@@ -27,7 +27,7 @@ public class HashUtils {
         return formatter.toString();
     }
 
-    public static String murmur2(byte[] data) {
+    public static long murmur2(byte[] data) {
         final int m = 0x5bd1e995;
         final int r = 24;
         long k = 0x0L;
@@ -105,6 +105,6 @@ public class HashUtils {
         h = h ^ (h >> 15);
         h = 0x00000000FFFFFFFFL & h;
 
-        return String.valueOf(h);
+        return h;
     }
 }