Need help with RTC Server side API to extract contributor of parent WI

Hello,

I am new to RTC and working on server side plugin wherein once parent WI is saved it triggers different child WI's. Child WI is initialized with most of the parent WI details like, Project Area, couple of custom Enumerator attributes.  

There is a requirement wherein all the child WI contributor should be initialized with the contributor selected in parent WI. I see lots of examples for client side API to extract contributor which implements following code

if ((value instanceof IContributorHandle)) {
IContributor contributor = (IContributor) getTeamRepository()
.itemManager().fetchCompleteItem(
(IContributorHandle) value, IItemManager.DEFAULT,
getMonitor());
return contributor.getName();
}

I need something similar for server side to extract Contributor and also initialize child WI Contributor with the value selected in parent.