implement setFacetContains in SolrQuery.java

Hi, I wanted to know if there was a reason for the SolrQuery class to have a setFacetPrefix but no setFacetContains nor setFacetContainsIgnoreCase. I could see that it is implemented in the php vu api.
I might start to work on implementing that actually and I wanted to know if someone could say if if possible or impossible, or maybe if someone has already done it somewhere.

Regards,

Julien LOUIS
Inria
France