public Traverser.Admin<S> get(final Traverser.Admin<S> traverser) {
        return this.map.get(traverser);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/util/TraverserSet.java