@Override
    public void addTo(final Traversal.Admin<?, ?> toObject) {
        this.parameters.set(this, TO, toObject);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/AddEdgeStartStep.java