Method subSet

corpus/java/training/guava/collect/Sets.java:1758–1782

Returns a view of the portion of set whose elements are contained by range. This method delegates to the appropriate methods of NavigableSet (namely NavigableSet#subSet(Object, boolean, Object, boolean) subSet(), {@link NavigableSet#tailSet(Object, boolean) tailSe

(
      NavigableSet<K> set, Range<K> range)

   * @since 20.0
   */
  @Beta
  @GwtIncompatible // NavigableSet
  public static <K extends Comparable<? super K>> NavigableSet<K> subSet(
      NavigableSet<K> set, Range<K> range) {
    if (set.comparator() != null
        && set.comparator() != Ordering.natural()
        && range.hasLowerBound()
        && range.hasUpperBound()) {
      checkArgument(
          set.comparator().compare(range.lowerEndpoint(), range.upperEndpoint()) <= 0,
          "set is using a custom comparator which is inconsistent with the natural ordering.");
    }
    if (range.hasLowerBound() && range.hasUpperBound()) {
      return set.subSet(
          range.lowerEndpoint(),
          range.lowerBoundType() == BoundType.CLOSED,
          range.upperEndpoint(),
          range.upperBoundType() == BoundType.CLOSED);
    } else if (range.hasLowerBound()) {
      return set.tailSet(range.lowerEndpoint(), range.lowerBoundType() == BoundType.CLOSED);
    } else if (range.hasUpperBound()) {
      return set.headSet(range.upperEndpoint(), range.upperBoundType() == BoundType.CLOSED);
    }
    return checkNotNull(set);
  }
}