API: Setting conditional steps

(If this thread does not belong in this forum, I'll happily move it. The developer forum seemed quite sparsely used, and this is about the specific Pentaho Data Integration API.)

I'm having difficulty figuring out how to set the conditional step values for "Filter row" steps using the API. I can see how to create basic hops as links between steps, but I don't see how to set the values that indicate the correct step based on the filter. In the XML this is represented simply as:

<send_true_to>Insert Transaction</send_true_to>
<send_false_to>Update Transaction</send_false_to>

I can see that these values are referenced in the FilterRowsData class, but I see no way to set them inside FilterRowsMeta or TransHopMeta.

Any help would be greatly appreciated.

Thanks,
Curt