code: private static AddOn getAddOn(Collection<AddOn> addOns, String id) {
  		for (AddOn addOn : addOns) {
  			if (addOn.getId().equals(id)) {
  				return addOn;
  			}
  		}
  		return null;
  	}
docs: Gets the add-on with the given {@code id} from the given collection of {@code addOns}.
  
  @param addOns the collection of add-ons where the search will be made
  @param id the id of the add-on to search for
  @return the {@code AddOn} with the given id, or {@code null} if not found