@Override
    protected Map<K, E> map(final Traverser.Admin<Element> traverser) {
        final Map<Object, Object> map = new LinkedHashMap<>();
        addIncludedOptions(traverser.get(), map);
        addElementProperties(traverser, map);
        applyTraversalRingToMap(map);
        return (Map) map;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/PropertyMapStep.java