How to use

unmodifiableNavigableSet

method

in

java.util.Collections

 @Override
 public NavigableSet<String> create(String[] elements) {
  NavigableSet<String> innerSet = new TreeSet<>();
  Collections.addAll(innerSet, elements);
  return Collections.unmodifiableNavigableSet(innerSet);
 }
})

/**
 * Get the sorted replicas in the ascending order of their priority and score.
 * This method initialize the sorted replicas if it hasn't been initialized.
 *
 * @return the sorted replicas in the ascending order of their priority and score.
 */
public NavigableSet<ReplicaWrapper> sortedReplicas() {
 ensureInitialize();
 return Collections.unmodifiableNavigableSet(_sortedReplicas);
}

classes.add(Collections.unmodifiableMap(Collections.emptyMap()).getClass());
classes.add(Collections.unmodifiableNavigableMap(Collections.emptyNavigableMap()).getClass());
classes.add(Collections.unmodifiableNavigableSet(Collections.emptyNavigableSet()).getClass());
classes.add(Collections.unmodifiableSet(Collections.emptySet()).getClass());
classes.add(Collections.unmodifiableSortedMap(Collections.emptySortedMap()).getClass());

assertTrue(immutability.test(Collections.unmodifiableMap(Collections.singletonMap("1", "2"))));
assertTrue(immutability.test(Collections.unmodifiableNavigableMap(new TreeMap<>(Collections.singletonMap("1", "2")))));
assertTrue(immutability.test(Collections.unmodifiableNavigableSet(new TreeSet<>(Collections.singleton("1")))));
assertTrue(immutability.test(Collections.unmodifiableSet(Collections.singleton("1"))));
assertTrue(immutability.test(Collections.unmodifiableSortedMap(new TreeMap<>(Collections.singletonMap("1", "2")))));

/**
 * Creates a new message set.
 *
 * @param messages The messages to be contained in this set.
 */
public MessageSetImpl(NavigableSet<Message> messages) {
  this.messages = Collections.unmodifiableNavigableSet(messages);
}

 @Override
 public NavigableSet<String> create(String[] elements) {
  NavigableSet<String> innerSet = new TreeSet<>();
  Collections.addAll(innerSet, elements);
  return Collections.unmodifiableNavigableSet(innerSet);
 }
})

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

 private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
  TreeSet<T> set = reverse
    ? new TreeSet<T>(Collections.reverseOrder())
    : new TreeSet<T>();
  set.addAll(list);
  return Collections.unmodifiableNavigableSet(set);
 }
}

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

private static <T extends Comparable<T>> NavigableSet<T> createUnmodifiableSortedSet(boolean reverse, List<T> list) {
 TreeSet<T> set = reverse
   ? new TreeSet<T>(Collections.reverseOrder())
   : new TreeSet<T>();
 set.addAll(list);
 return Collections.unmodifiableNavigableSet(set);
}

/**
 * Get the names of all {@link SchemaObjectType}s.
 *
 * @return unmodifiable set of {@link SchemaObjectType} names
 */
public NavigableSet<String> getSchemaObjectTypeNames() {
  return Collections.unmodifiableNavigableSet(this.typeMap.navigableKeySet());
}

@Override
void lockDownRecurse() {
  super.lockDownRecurse();
  if (this.objectTypes != null)
    this.objectTypes = Collections.unmodifiableNavigableSet(this.objectTypes);
}

/**
 * Get the names of all {@link SchemaObjectType}s.
 *
 * @return unmodifiable set of {@link SchemaObjectType} names
 */
public NavigableSet<String> getSchemaObjectTypeNames() {
  return Collections.unmodifiableNavigableSet(this.typeMap.navigableKeySet());
}

@Override
void lockDownRecurse() {
  super.lockDownRecurse();
  if (this.objectTypes != null)
    this.objectTypes = Collections.unmodifiableNavigableSet(this.objectTypes);
}