From c792be92675803684477f7ff235baaf74ef85cfd Mon Sep 17 00:00:00 2001
From: Florian Schmaus <flo@geekplace.eu>
Date: Thu, 7 Jun 2018 17:55:00 +0200
Subject: [PATCH] Add StringUtils.requireNullOrNotEmpty()

---
 .../java/org/jivesoftware/smack/util/StringUtils.java  | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/smack-core/src/main/java/org/jivesoftware/smack/util/StringUtils.java b/smack-core/src/main/java/org/jivesoftware/smack/util/StringUtils.java
index 4b9bfe94c..c2650ebcc 100644
--- a/smack-core/src/main/java/org/jivesoftware/smack/util/StringUtils.java
+++ b/smack-core/src/main/java/org/jivesoftware/smack/util/StringUtils.java
@@ -451,6 +451,16 @@ public class StringUtils {
         return cs;
     }
 
+    public static <CS extends CharSequence> CS requireNullOrNotEmpty(CS cs, String message) {
+        if (cs == null) {
+            return null;
+        }
+        if (cs.toString().isEmpty()) {
+            throw new IllegalArgumentException(message);
+        }
+        return cs;
+    }
+
     /**
      * Return the String representation of the given char sequence if it is not null.
      *