Get the repository URI for an IResource

I have an IResource and I would like to get the repository URI associated with this IResource.

In RTC 3.0 I can do this:

IShareable shareable = (IShareable) resource.getAdapter(IShareable.class);

ISharingDescriptor  sd = shareable.getShare(new NullProgressMonitor()).getSharingDescriptor();

String repositoryURI = sd.getRepositoryUri();

In RTC 4.0 getRepositoryUri() has been removed from ISharingDescriptor. I can do this:

IShareable shareable = (IShareable) resource.getAdapter(IShareable.class);

ISharingDescriptor  sd = shareable.getShare(new NullProgressMonitor()).getSharingDescriptor();

UUID repositoryId = sd.getRepositoryId();

ITeamRepository teamRepository = TeamPlatform.getTeamRepositoryService().getTeamRepository(repositoryId);

String repositoryURI = teamRepository.getRepositoryURI();

But, in RTC 3.0, TeamPlatform.getTeamRepositoryService().getTeamRepository() can not take a UUID, it only takes a String.

Is there a way to write this code such that it works in both RTC 3.0 and 4.0?

Thanks,
Steve