Made refresh_from not nullable

Author: gmsdelmundo

src/main/java/com/uid2/admin/store/writer/SaltSerializer.java

@@ -3,7 +3,8 @@
 import com.uid2.shared.model.SaltEntry;
 
 public final class SaltSerializer {
-    private SaltSerializer() {}
+    private SaltSerializer() {
+    }
 
     public static String toCsv(SaltEntry[] entries) {
         StringBuilder stringBuilder = new StringBuilder();
@@ -25,7 +26,7 @@ private static void addLine(SaltEntry entry, StringBuilder stringBuilder) {
                 .append(entry.currentSalt());
 
         stringBuilder.append(",");
-        stringBuilder.append(serializeNullable(entry.refreshFrom()));
+        stringBuilder.append(entry.refreshFrom());
 
         stringBuilder.append(",");
         stringBuilder.append(serializeNullable(entry.previousSalt()));
@@ -45,8 +46,7 @@ private static void appendKey(StringBuilder stringBuilder, SaltEntry.KeyMaterial
                     .append(serializeNullable(key.key()))
                     .append(",")
                     .append(serializeNullable(key.salt()));
-        }
-        else  {
+        } else {
             stringBuilder.append(",,,");
         }
     }

src/main/java/com/uid2/admin/vertx/service/SaltService.java

@@ -50,7 +50,6 @@ public class SaltService implements IService {
     private final RotatingSaltProvider saltProvider;
     private final SaltRotation saltRotation;
 
-
     public SaltService(AdminAuthMiddleware auth,
                        WriteLock writeLock,
                        SaltStoreWriter storageManager,
@@ -178,4 +177,4 @@ private JsonObject toJson(RotatingSaltProvider.SaltSnapshot snapshot) {
                 .max(Long::compare).orElse(null));
         return jo;
     }
-}
+}

src/test/java/com/uid2/admin/salt/helper/SaltBuilder.java

@@ -6,7 +6,7 @@
 import java.time.Instant;
 import java.util.concurrent.atomic.AtomicInteger;
 
-public class SaltBuilder {
+public final class SaltBuilder {
     private static final AtomicInteger LAST_AUTO_ID = new AtomicInteger(0);
 
     private int id = LAST_AUTO_ID.incrementAndGet();