How to use

immutableSet

method

in

org.apache.sis.internal.util.CollectionsExt

/**
 * Returns the names of feature properties that this operation needs for performing its task.
 */
@Override
@SuppressWarnings("ReturnOfCollectionOrArrayField")
public synchronized Set<String> getDependencies() {
  if (dependencies == null) {
    dependencies = CollectionsExt.immutableSet(true, attributeNames);
  }
  return dependencies;
}

/**
 * Returns the names of feature properties that this operation needs for performing its task.
 */
@Override
@SuppressWarnings("ReturnOfCollectionOrArrayField")
public synchronized Set<String> getDependencies() {
  if (dependencies == null) {
    dependencies = CollectionsExt.immutableSet(true, attributeNames);
  }
  return dependencies;
}

/**
 * Returns the names of feature properties that this operation needs for performing its task.
 */
@Override
@SuppressWarnings("ReturnOfCollectionOrArrayField")
public synchronized Set<String> getDependencies() {
  if (dependencies == null) {
    dependencies = CollectionsExt.immutableSet(true, attributeNames);
  }
  return dependencies;
}

/**
 * Returns the names of feature properties that this operation needs for performing its task.
 */
@Override
@SuppressWarnings("ReturnOfCollectionOrArrayField")
public synchronized Set<String> getDependencies() {
  if (dependencies == null) {
    dependencies = CollectionsExt.immutableSet(true, attributeNames);
  }
  return dependencies;
}

/**
 * Filters names, aliases and identifiers by their code spaces. If the given array is non-null, then the only names,
 * aliases and identifiers to be formatted are those having a {@link ReferenceIdentifier#getCodeSpace()},
 * {@link ScopedName#head()} or {@link GenericName#scope()} value in the given list, unless no name or alias
 * matches this criterion.
 *
 * @param codespaces  the preferred code spaces of names, aliases and identifiers to format, or {@code null}
 *        for accepting all of them. Some typical values are {@code "EPSG"}, {@code "OGC"} or {@code "GeoTIFF"}.
 */
public void setPreferredCodespaces(final String... codespaces) {
  Set<String> copy = null;
  if (codespaces != null) {
    copy = CollectionsExt.immutableSet(true, codespaces);
  }
  this.preferredCodespaces = copy;
}

/**
 * Filters names, aliases and identifiers by their code spaces. If the given array is non-null, then the only names,
 * aliases and identifiers to be formatted are those having a {@link ReferenceIdentifier#getCodeSpace()},
 * {@link ScopedName#head()} or {@link GenericName#scope()} value in the given list, unless no name or alias
 * matches this criterion.
 *
 * @param codespaces  the preferred code spaces of names, aliases and identifiers to format, or {@code null}
 *        for accepting all of them. Some typical values are {@code "EPSG"}, {@code "OGC"} or {@code "GeoTIFF"}.
 */
public void setPreferredCodespaces(final String... codespaces) {
  Set<String> copy = null;
  if (codespaces != null) {
    copy = CollectionsExt.immutableSet(true, codespaces);
  }
  this.preferredCodespaces = copy;
}

/**
 * Returns a copy of the given array as a non-empty immutable set.
 * If the given array is empty, then this method returns {@code null}.
 *
 * @param  <T>       the type of elements.
 * @param  elements  the elements to copy in a set.
 * @return an unmodifiable set which contains all the given elements, or {@code null}.
 *
 * @since 0.6
 */
@SafeVarargs
public static <T> Set<T> nonEmptySet(final T... elements) {
  final Set<T> asSet = immutableSet(true, elements);
  return (asSet != null && asSet.isEmpty()) ? null : asSet;
}

/**
 * Returns the specified array as an immutable set, or {@code null} if the array is null.
 * If the given array contains duplicated elements, i.e. elements that are equal in the
 * sense of {@link Object#equals(Object)}, then only the last instance of the duplicated
 * values will be included in the returned set.
 *
 * @param  <E> The type of array elements.
 * @param  array The array to copy in a set. May be {@code null}.
 * @return A set containing the array elements, or {@code null} if the given array was null.
 *
 * @see Collections#unmodifiableSet(Set)
 *
 * @since 3.17
 */
@SafeVarargs
public static <E> Set<E> immutableSet(final E... array) {
  return CollectionsExt.immutableSet(false, array);
}

/**
 * Returns a copy of the given array as a non-empty immutable set.
 * If the given array is empty, then this method returns {@code null}.
 *
 * @param  <T>       the type of elements.
 * @param  elements  the elements to copy in a set.
 * @return an unmodifiable set which contains all the given elements, or {@code null}.
 *
 * @since 0.6
 */
@SafeVarargs
public static <T> Set<T> nonEmptySet(final T... elements) {
  final Set<T> asSet = immutableSet(true, elements);
  return (asSet != null && asSet.isEmpty()) ? null : asSet;
}

/**
 * Sets an enumeration of valid values for the attribute.
 *
 * <p>This is a convenience method for {@link #addCharacteristic(Class)} with a value
 * of type {@link Set} and a conventional name.</p>
 *
 * @param  values  valid values.
 * @return {@code this} for allowing method calls chaining.
 *
 * @see #characteristics()
 * @see AttributeConvention#VALID_VALUES_CHARACTERISTIC
 */
@SafeVarargs
public final AttributeTypeBuilder<V> setValidValues(final V... values) {
  return setCharacteristic(AttributeConvention.VALID_VALUES_CHARACTERISTIC,
      Set.class, CollectionsExt.immutableSet(false, values));
}

/**
 * Sets an enumeration of valid values for the attribute.
 *
 * <p>This is a convenience method for {@link #addCharacteristic(Class)} with a value
 * of type {@link Set} and a conventional name.</p>
 *
 * @param  values  valid values.
 * @return {@code this} for allowing method calls chaining.
 *
 * @see #characteristics()
 * @see AttributeConvention#VALID_VALUES_CHARACTERISTIC
 */
@SafeVarargs
public final AttributeTypeBuilder<V> setValidValues(final V... values) {
  return setCharacteristic(AttributeConvention.VALID_VALUES_CHARACTERISTIC,
      Set.class, CollectionsExt.immutableSet(false, values));
}

  this.superTypes = Collections.emptySet();
} else {
  this.superTypes = CollectionsExt.immutableSet(true, superTypes);
  for (final FeatureType type : this.superTypes) {
    if (type instanceof NamedFeatureType) {

} else {
  clones(array);
  collection = CollectionsExt.immutableSet(false, array);

} else {
  applyToAll(array);
  collection = CollectionsExt.immutableSet(false, array);

  this.superTypes = Collections.emptySet();
} else {
  this.superTypes = CollectionsExt.immutableSet(true, superTypes);
  for (final FeatureType type : this.superTypes) {
    if (type instanceof NamedFeatureType) {

  throw (IllegalArgumentException) illegalPropertyType(properties, ALIAS_KEY, value).initCause(e);
alias = immutableSet(true, names);
  identifiers = Collections.singleton((ReferenceIdentifier) value);
} else if (value instanceof ReferenceIdentifier[]) {
  identifiers = immutableSet(true, (ReferenceIdentifier[]) value);
} else {
  throw illegalPropertyType(properties, IDENTIFIERS_KEY, value);

  throw (IllegalArgumentException) illegalPropertyType(properties, ALIAS_KEY, value).initCause(e);
alias = immutableSet(true, names);
  identifiers = Collections.singleton((ReferenceIdentifier) value);
} else if (value instanceof ReferenceIdentifier[]) {
  identifiers = immutableSet(true, (ReferenceIdentifier[]) value);
} else {
  throw illegalPropertyType(properties, IDENTIFIERS_KEY, value);