How did you solve it in OH1?
Do you check the item type and then have a generic logic of what state update you are sending?
Sooner or later we need to introduce a way to give bindings some information about what is linked to them and how - see also https://github.com/eclipse/smarthome/issues/583. This should only give them access to the item types and the link configuration, not directly item names (to make sure the separation is kept) - but this should bring you all you are asking for here I guess.