From 12b5dbaf3d170a3388a4f1f26f4dc3700141b687 Mon Sep 17 00:00:00 2001
From: Claus Stadler <RavenArkadon@googlemail.com>
Date: Mon, 23 Sep 2024 12:28:09 +0200
Subject: [PATCH] Added HasSelf util class

---
 .../org/aksw/commons/util/obj/HasSelf.java    | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 aksw-commons-utils-parent/aksw-commons-utils/src/main/java/org/aksw/commons/util/obj/HasSelf.java

diff --git a/aksw-commons-utils-parent/aksw-commons-utils/src/main/java/org/aksw/commons/util/obj/HasSelf.java b/aksw-commons-utils-parent/aksw-commons-utils/src/main/java/org/aksw/commons/util/obj/HasSelf.java
new file mode 100644
index 00000000..4b130eae
--- /dev/null
+++ b/aksw-commons-utils-parent/aksw-commons-utils/src/main/java/org/aksw/commons/util/obj/HasSelf.java
@@ -0,0 +1,20 @@
+package org.aksw.commons.util.obj;
+
+/** This interface is useful for builders of the form below, in order to hide
+ * the uncheck cast warning of {@code return (X)this;}.
+ *
+ * <pre>{@code
+ * interface MyBuilderMixin<X extends MyBuilderMixin<X>> extends HasSelf<X> {
+ *   default X someMethod() {
+ *      // Do something
+ *      return self();
+ *   }
+ * }
+ * }</pre>
+ */
+public interface HasSelf<T> {
+    @SuppressWarnings("unchecked")
+    default T self() {
+        return (T)this;
+    }
+}