@Override
    public T next() {
        return iterator.next();
    }
A default implementation of {@link CloseableIterator} that simply wraps an existing {@code Iterator}. This
implementation has a "do nothing" implementation of {@link #close()}.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/util/DefaultCloseableIterator.java