Migrate RepeatMode enum to kotlin.

Signed-off-by: Yahor Berdnikau <egorr.berd@gmail.com>

ultrasonic/src/main/java/org/moire/ultrasonic/domain/RepeatMode.java

@@ -1,35 +0,0 @@
-package org.moire.ultrasonic.domain;
-
-/**
- * @author Sindre Mehus
- * @version $Id$
- */
-public enum RepeatMode
-{
-	OFF
-			{
-				@Override
-				public RepeatMode next()
-				{
-					return ALL;
-				}
-			},
-	ALL
-			{
-				@Override
-				public RepeatMode next()
-				{
-					return SINGLE;
-				}
-			},
-	SINGLE
-			{
-				@Override
-				public RepeatMode next()
-				{
-					return OFF;
-				}
-			};
-
-	public abstract RepeatMode next();
-}

ultrasonic/src/main/kotlin/org/moire/ultrasonic/domain/RepeatMode.kt

@@ -0,0 +1,15 @@
+package org.moire.ultrasonic.domain
+
+enum class RepeatMode {
+    OFF {
+        override operator fun next(): RepeatMode = ALL
+    },
+    ALL {
+        override operator fun next(): RepeatMode = SINGLE
+    },
+    SINGLE {
+        override operator fun next(): RepeatMode = OFF
+    };
+
+    abstract operator fun next(): RepeatMode
+}