Added isFullJID() helper in StringUtils

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_0@13575 b35dd754-fafc-0310-a699-88a17e54d16e

source/org/jivesoftware/smack/util/StringUtils.java

@@ -362,6 +362,20 @@ public class StringUtils {
         }
     }
 
+    /**
+     * Returns true if jid is a full JID (i.e. a JID with resource part).
+     *
+     * @param jid
+     * @return true if full JID, false otherwise
+     */
+    public static boolean isFullJID(String jid) {
+        if (parseName(jid).length() <= 0 || parseServer(jid).length() <= 0
+                || parseResource(jid).length() <= 0) {
+            return false;
+        }
+        return true;
+    }
+
     /**
      * Escapes the node portion of a JID according to "JID Escaping" (JEP-0106).
      * Escaping replaces characters prohibited by node-prep with escape sequences,