import java.util.Iterator;

/** An ordering that uses the reverse of the natural order of the values. */
@GwtCompatible(serializable = true)
@SuppressWarnings({"unchecked", "rawtypes"}) // TODO(kevinb): the right way to explain this??
@ElementTypesAreNonnullByDefault
final class ReverseNaturalOrdering extends Ordering<Comparable<?>> implements Serializable {
  static final ReverseNaturalOrdering INSTANCE = new ReverseNaturalOrdering();

  @Override

/** An ordering that uses the natural order of the values. */
@GwtCompatible(serializable = true)
@SuppressWarnings({"unchecked", "rawtypes"}) // TODO(kevinb): the right way to explain this??
@ElementTypesAreNonnullByDefault
final class NaturalOrdering extends Ordering<Comparable<?>> implements Serializable {
  static final NaturalOrdering INSTANCE = new NaturalOrdering();

  }

  @Override
  public int compare(@ParametricNullness T a, @ParametricNullness T b) {
    return forwardOrder.compare(b, a);
  }

  @SuppressWarnings("unchecked") // how to explain?
  @Override
  public <S extends T> Ordering<S> reverse() {
    return (Ordering<S>) forwardOrder;
  }

  // Override the min/max methods to "hoist" delegation outside loops

  @Override

    // ordering.reverse() might be optimized, so let it do its thing
    return ordering.<T>reverse().<@NonNull S>nullsLast();
  }

  @SuppressWarnings("unchecked") // still need the right way to explain this
  @Override
  public <S extends @Nullable T> Ordering<@Nullable S> nullsFirst() {
    return (Ordering<@Nullable S>) this;
  }

  @Override
  public <S extends @Nullable T> Ordering<@Nullable S> nullsLast() {

at least I know who I WAS when I got up this morning, but I think
I must have been changed several times since then.'

  `What do you mean by that?' said the Caterpillar sternly.
`Explain yourself!'

  `I can't explain MYSELF, I'm afraid, sir' said Alice, `because
I'm not myself, you see.'

  `I don't see,' said the Caterpillar.

  `I'm afraid I can't put it more clearly,' Alice replied very

  }

  @Override
  public <S extends @Nullable T> Ordering<@Nullable S> nullsFirst() {
    return ordering.<@NonNull S>nullsFirst();
  }

  @SuppressWarnings("unchecked") // still need the right way to explain this
  @Override
  public <S extends @Nullable T> Ordering<@Nullable S> nullsLast() {
    return (Ordering<@Nullable S>) this;
  }

  @Override
  public boolean equals(@CheckForNull Object object) {

at least I know who I WAS when I got up this morning, but I think
I must have been changed several times since then.'

  `What do you mean by that?' said the Caterpillar sternly.
`Explain yourself!'

  `I can't explain MYSELF, I'm afraid, sir' said Alice, `because
I'm not myself, you see.'

  `I don't see,' said the Caterpillar.

  `I'm afraid I can't put it more clearly,' Alice replied very

   *
   * <p><b>Java 8+ users:</b> use {@link Comparator#naturalOrder} instead.
   */
  @GwtCompatible(serializable = true)
  @SuppressWarnings({"unchecked", "rawtypes"})
  // TODO(kevinb): right way to explain this??
  // plus https://github.com/google/guava/issues/989
  public static <C extends Comparable> Ordering<C> natural() {
    return (Ordering<C>) NaturalOrdering.INSTANCE;
  }

  // Static factories

@GwtCompatible
@ElementTypesAreNonnullByDefault
final class NullnessCasts {
  /**
   * Accepts a {@code @Nullable T} and returns a plain {@code T}, without performing any check that
   * that conversion is safe.
   *
   * <p>This method is intended to help with usages of type parameters that have {@linkplain

   *
   * (PatternFilenameFilter is of course one of those classes that shouldn't be a publicly visible
   * class to begin with but rather something returned from a static factory method whose declared
   * return type is plain FilenameFilter. If we made such a change, then the annotation we choose
   * here would have no significance to end users, who would be forced to conform to the signature
   * used in FilenameFilter.)
   */
  @Override