- public static String join(CharSequence separator, Iterable<? extends CharSequence> list) {
- StringBuilder buf = new StringBuilder();
- for (CharSequence str : list) {
- if (buf.length() > 0) {
- buf.append(separator);
- }
- buf.append(str);
- }
-
- return buf.toString();
+ public static GroupId decodeGroupId(String groupId) throws GroupIdFormatException {
+ return GroupId.fromBase64(groupId);