From 3fdf49f3afe2568f0abbc1b2a76764eb3a4b9100 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20N=C3=BCcke?= <florian@nuecke.de>
Date: Sun, 13 Feb 2022 16:54:49 +0100
Subject: [PATCH] Make getter return readonly collection.

---
 .../java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java b/src/main/java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java
index a22bfe20..60129a67 100644
--- a/src/main/java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java
+++ b/src/main/java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java
@@ -35,7 +35,7 @@ public abstract class AbstractDeviceBusElement implements DeviceBusElement {
 
     @Override
     public Collection<DeviceBusController> getControllers() {
-        return controllers;
+        return Collections.unmodifiableSet(controllers);
     }
 
     @Override