@Override
        public Message next() {
            if (this.hasNext()) {
                try {
                    return this.it.next();
                }
                catch (Exception e) {
                    throw new IllegalStateException(e);
                }
            }
            else {
                throw new NoSuchElementException();
            }
        }
TopicBrowser implementation.

@author dennis<killme2008@gmail.com>
@since 1.4.5
metamorphosis-client/src/main/java/com/taobao/metamorphosis/client/MetaTopicBrowser.java