How to use

unmodifiableNavigableSet

method

in

org.apache.drill.shaded.guava.com.google.common.collect.Sets

static <E> Collection<E> unmodifiableCollectionSubclass(Collection<E> collection) {
 if (collection instanceof NavigableSet) {
  return Sets.unmodifiableNavigableSet((NavigableSet<E>) collection);
 } else if (collection instanceof SortedSet) {
  return Collections.unmodifiableSortedSet((SortedSet<E>) collection);
 } else if (collection instanceof Set) {
  return Collections.unmodifiableSet((Set<E>) collection);
 } else if (collection instanceof List) {
  return Collections.unmodifiableList((List<E>) collection);
 } else {
  return Collections.unmodifiableCollection(collection);
 }
}

@Override
public NavigableSet<E> subSet(
  E fromElement, boolean fromInclusive, E toElement, boolean toInclusive) {
 return unmodifiableNavigableSet(
   delegate.subSet(fromElement, fromInclusive, toElement, toInclusive));
}

@Override
public NavigableSet<E> headSet(E toElement, boolean inclusive) {
 return unmodifiableNavigableSet(delegate.headSet(toElement, inclusive));
}

@Override
public NavigableSet<K> navigableKeySet() {
 return Sets.unmodifiableNavigableSet(delegate.navigableKeySet());
}

@Override
public NavigableSet<E> tailSet(E fromElement, boolean inclusive) {
 return unmodifiableNavigableSet(delegate.tailSet(fromElement, inclusive));
}

@Override
public NavigableSet<K> descendingKeySet() {
 return Sets.unmodifiableNavigableSet(delegate.descendingKeySet());
}

@Override
NavigableSet<E> createElementSet() {
 return Sets.unmodifiableNavigableSet(delegate().elementSet());
}