private boolean tryComputeNext() {
        try {
            next = orig.next();
            return true;
        } catch (NoSuchElementException ex) {
            close();
            next = null;
            return false;
        }
    }
Represents if the iterator has been fully consumed
tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerGraphIterator.java