@Override
            public E next() {
                if (this.hasNext())
                    return this.currentIterator.next();
                else
                    throw FastNoSuchElementException.instance();
            }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/util/iterator/IteratorUtils.java