Vanity URL Creation

Hello, we are running Webcenter Sites 11.1.1.8, patch 4, we are trying to implement an auto generation logic for vanity URLS( Vanity url auto generation).

We have generated a new Flex filter, we are being able to attach ourselves to the save event, and in it we can get the asset information, and even its current vanity URL, but we don't know how to actually SET the vanity TO the Asset via the Java API.

Attached is some sample code.

Can you please point us in the right direction?

Thanks!