From 4afe573a68ef848efe075a4a1710890f7b7c5f69 Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Tue, 17 Jul 2018 11:39:51 +0200
Subject: [PATCH] Add Objects.requireNonNullOrEmpty

---
 .../main/java/org/jivesoftware/smack/util/Objects.java   | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/smack-core/src/main/java/org/jivesoftware/smack/util/Objects.java b/smack-core/src/main/java/org/jivesoftware/smack/util/Objects.java
index 26d0bbe85..80e15d4b2 100644
--- a/smack-core/src/main/java/org/jivesoftware/smack/util/Objects.java
+++ b/smack-core/src/main/java/org/jivesoftware/smack/util/Objects.java
@@ -16,6 +16,8 @@
  */
 package org.jivesoftware.smack.util;
 
+import java.util.Collection;
+
 public class Objects {
 
     public static <T> T requireNonNull(T obj, String message) {
@@ -29,6 +31,13 @@ public class Objects {
         return requireNonNull(obj, null);
     }
 
+    public static <T extends Collection<?>> T requireNonNullOrEmpty(T collection, String message) {
+        if (requireNonNull(collection).isEmpty()) {
+            throw new IllegalArgumentException(message);
+        }
+        return collection;
+    }
+
     public static boolean equals(Object a, Object b) {
         return a == b || (a != null && a.equals(b));
     }