From 5424c9635fc66907e2a3613e718b6600ed6fecc5 Mon Sep 17 00:00:00 2001
From: Florian Schmaus <flo@geekplace.eu>
Date: Sat, 17 Jun 2017 11:41:35 +0200
Subject: [PATCH] Add XmlStringBuilder.optXmlLangAttribute(String)

---
 .../org/jivesoftware/smack/util/XmlStringBuilder.java    | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java b/smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java
index 1ffcd8d0c..2579bf522 100644
--- a/smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java
+++ b/smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java
@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2014-2015 Florian Schmaus
+ * Copyright 2014-2017 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -360,6 +360,13 @@ public class XmlStringBuilder implements Appendable, CharSequence {
         return this;
     }
 
+    public XmlStringBuilder optXmlLangAttribute(String lang) {
+        if (lang != null) {
+            xmllangAttribute(lang);
+        }
+        return this;
+    }
+
     public XmlStringBuilder escape(String text) {
         assert text != null;
         sb.append(StringUtils.escapeForXml(text));