How Can i fetch Basline Name from the Change set

Currently im developing a server side plugin and i can fetch the Changesets and Component Handle.

 IComponentHandle cHandle = changeSet.getComponent();
      IComponent component=
          (IComponent) repositoryItemService.fetchItem(componentHandle, IRepositoryItemService.COMPLETE);

but how can i fetch the Baseline Name? I have tried by using IBaselineHandle but im getting an exception

 IBaselineHandle baselineHandle = (IBaselineHandle) link.getSourceRef().resolve();