@Override
    public <U> Iterator<Property<U>> properties(final String... propertyKeys) {
        return IteratorUtils.<Property<U>, Property<U>>map(this.getBaseVertexProperty().properties(propertyKeys), property -> new HadoopProperty<>(property, HadoopVertexProperty.this));
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/HadoopVertexProperty.java