From a6299a7419acae2e45b8806280c8bc347e519960 Mon Sep 17 00:00:00 2001
From: Fulminazzo <fulminazzo21@gmail.com>
Date: Thu, 11 Apr 2024 20:32:45 +0200
Subject: [PATCH] Added javadoc

---
 .../java/it/angrybear/yagl/guis/GUIImpl.java    | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/gui/base/src/main/java/it/angrybear/yagl/guis/GUIImpl.java b/gui/base/src/main/java/it/angrybear/yagl/guis/GUIImpl.java
index 7f709ade..fe543b5c 100644
--- a/gui/base/src/main/java/it/angrybear/yagl/guis/GUIImpl.java
+++ b/gui/base/src/main/java/it/angrybear/yagl/guis/GUIImpl.java
@@ -80,12 +80,19 @@ public boolean isMovable(int slot) {
         return this;
     }
 
-    protected int addSingle(GUIContent content, int j) {
-        for (; j < this.contents.size(); j++) {
-            Contents c = this.contents.get(j);
+    /**
+     * Tries to add the given content from the given index.
+     *
+     * @param content   the content
+     * @param index     the index
+     * @return the new index if it was successful, -1 in case of error
+     */
+    protected int addSingle(final @NotNull GUIContent content, int index) {
+        for (; index < this.contents.size(); index++) {
+            Contents c = this.contents.get(index);
             if (c == null) {
-                this.contents.set(j, new Contents(content));
-                return j;
+                this.contents.set(index, new Contents(content));
+                return index;
             }
         }
         return -1;