Convert DisjointSet to Kotlin

util/src/main/java/dev/openrs2/util/collect/DisjointSet.java

@@ -1,13 +0,0 @@
-package dev.openrs2.util.collect;
-
-public interface DisjointSet<T> extends Iterable<DisjointSet.Partition<T>> {
-	interface Partition<T> extends Iterable<T> {
-		/* empty */
-	}
-
-	Partition<T> add(T x);
-	Partition<T> get(T x);
-	void union(Partition<T> x, Partition<T> y);
-	int elements();
-	int partitions();
-}

util/src/main/java/dev/openrs2/util/collect/DisjointSet.kt

@@ -0,0 +1,11 @@
+package dev.openrs2.util.collect
+
+interface DisjointSet<T> : Iterable<DisjointSet.Partition<T>> {
+    interface Partition<T> : Iterable<T>
+
+    fun add(x: T): Partition<T>
+    operator fun get(x: T): Partition<T>?
+    fun union(x: Partition<T>, y: Partition<T>)
+    fun elements(): Int
+    fun partitions(): Int
+}