code: private <T> T getItem(String itemName, Map<String, T> items, String typeName) {
  		T item = items.get(itemName);
  		if (item == null) {
  			throw new FuzzerException(name + ": " + typeName + " '" + itemName + "' not found");
  		}
  		return item;
  	}
docs: Get an item from a map.
  <p>
  @param <T>      the map type
  @param itemName the item name
  @param items    the items
  @param typeName the item type name
  @return the item