How to use

unmodifiableIterable

method

in

org.apache.commons.collections4.IterableUtils

/**
 * Returns a new FluentIterable whose iterator will return an unmodifiable
 * view of this iterable.
 *
 * @return a new iterable, providing an unmodifiable view of this iterable
 */
public FluentIterable<E> unmodifiable() {
  return of(IterableUtils.unmodifiableIterable(iterable));
}