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