* @author Kurt Alfred Kluever
 * @author Kevin Bourrillion
 * @since 10.0
 */
@DoNotMock("Use Optional.of(value) or Optional.absent()")
@GwtCompatible
public abstract class Optional<T> implements Serializable {
  /**
   * Returns an {@code Optional} instance with no contained reference.
   *
   * <p><b>Comparison to {@code java.util.Optional}:</b> this method is equivalent to Java 8's
   * {@code Optional.empty}.

}

// SetEvalRetentionBypassFn sets the retention bypass function
func (o *ObjectOptions) SetEvalRetentionBypassFn(f EvalRetentionBypassFn) {
	o.EvalRetentionBypassFn = f
}

// ObjectLayer implements primitives for object API layer.
type ObjectLayer interface {
	// Locking operations on object.
	NewNSLock(bucket string, objects ...string) RWLocker

	// Storage operations.
	Shutdown(context.Context) error

//	suffix := "config.json"
//	result is foo
func extractPathPrefixAndSuffix(s string, prefix string, suffix string) string {
	return pathClean(strings.TrimSuffix(strings.TrimPrefix(s, prefix), suffix))
}

// IAMEtcdStore implements IAMStorageAPI
type IAMEtcdStore struct {
	sync.RWMutex

	*iamCache

	usersSysType UsersSysType

	client *etcd.Client
}

 *
 * @author Louis Wasserman
 * @since 12.0
 */
@GwtIncompatible // hasn't been tested yet
public abstract class ImmutableSortedMultiset<E> extends ImmutableMultiset<E>
    implements SortedMultiset<E> {
  // TODO(lowasser): GWT compatibility

  /**
   * Returns a {@code Collector} that accumulates the input elements into a new {@code

  }

  /**
   * This is an enum singleton rather than an anonymous class so ProGuard can figure out it's only
   * referenced by emptyModifiableIterator().
   */
  private enum EmptyModifiableIterator implements Iterator<Object> {
    INSTANCE;

    @Override
    public boolean hasNext() {
      return false;
    }

    @Override
    public Object next() {
      throw new NoSuchElementException();

  }

  /**
   * This is an enum singleton rather than an anonymous class so ProGuard can figure out it's only
   * referenced by emptyModifiableIterator().
   */
  private enum EmptyModifiableIterator implements Iterator<Object> {
    INSTANCE;

    @Override
    public boolean hasNext() {
      return false;
    }

    @Override
    public Object next() {
      throw new NoSuchElementException();

        if (hits == null) {
            throw new IllegalBehaviorStateException("hits is null: " + response);
        }
        return hits;
    }

    public static class BulkList<E, B> implements List<E> {

        private final List<E> parent;

        private final RequestOptionCall<BulkRequestBuilder> call;

        private final RequestOptionCall<B> entityCall;

    byte[] array = newPreFilledByteArray(1000);
    assertThat(ByteStreams.readBytes(new ByteArrayInputStream(array), new TestByteProcessor()))
        .isEqualTo(array);
  }

  private static class TestByteProcessor implements ByteProcessor<byte[]> {
    private final ByteArrayOutputStream out = new ByteArrayOutputStream();

    @Override
    public boolean processBytes(byte[] buf, int off, int len) {
      out.write(buf, off, len);

    /**
     * Determines whether the content at the given URL has been updated since the last crawl.
     * This method implements incremental crawling by comparing timestamps and checking document
     * expiration. It also handles special cases for different URL schemes (SMB, file, FTP).
     *

    return ObjectArrays.concat(a, b, Integer.class);
  }

  @J2ktIncompatible
  @GwtIncompatible // used only from suite
  public abstract static class TestIntegerListGenerator implements TestListGenerator<Integer> {
    @Override
    public SampleElements<Integer> samples() {
      return new SampleIntegers();
    }

    @Override
    public List<Integer> create(Object... elements) {