*
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible
public abstract class ImmutableMultimap<K, V> extends BaseImmutableMultimap<K, V>
    implements Serializable {

  /**
   * Returns an empty multimap.
   *
   * <p><b>Performance note:</b> the instance returned is a singleton.
   */
  public static <K, V> ImmutableMultimap<K, V> of() {
    return ImmutableListMultimap.of();
  }

      @SuppressWarnings("unchecked") // The natural-ordered empty set supports all types.
      RegularImmutableSortedSet<E> result =
          (RegularImmutableSortedSet<E>) RegularImmutableSortedSet.NATURAL_EMPTY_SET;
      return result;
    } else {
      return new RegularImmutableSortedSet<>(ImmutableList.of(), comparator);
    }
  }

  /**
   * Returns the empty immutable sorted set.
   *

        public void updateDocument(Map<String, Object> dataMap) {
            // Do nothing
        }
    }

    private static class TestSearchEngineClient extends SearchEngineClient {
        // Empty implementation for testing
    }

    private static class TestIngestFactory extends IngestFactory {
        List<Ingester> ingesters = new ArrayList<>();

        @Override

          if (staticIndex != null) {
            headerNameIndex = staticIndex + 1
            if (headerNameIndex in 2..7) {
              // Only search a subset of the static header table. Most entries have an empty value, so
              // it's unnecessary to waste cycles looking at them. This check is built on the
              // observation that the header entries we care about are in adjacent pairs, and we

        // addr1's count should remain unchanged since it succeeded
        assertEquals(5, poolSpy.failCounts.get("10.0.0.1"));
    }

    @Test
    @DisplayName("Should throw UnknownHostException for empty address list")
    void testUnknownHostException() throws Exception {
        // Given: No addresses returned
        when(nameSvc.getAllByName(eq("unknown.host"), eq(true))).thenReturn(new Address[0]);

	if err != nil {
		t.Fatal(err)
	}

	bucket := "bucket"
	object := "empty-dir/"
	var opts ObjectOptions

	err = obj.MakeBucket(ctx, bucket, MakeBucketOptions{})
	if err != nil {
		t.Fatalf("Failed to make a bucket - %v", err)
	}

	// Upload an empty directory
	_, err = obj.PutObject(ctx, bucket, object, mustGetPutObjReader(t,

    const char** ptr = nullptr;
    if (!strs.empty()) {
      ptr = new const char*[strs.size()];
      for (size_t i = 0; i < strs.size(); ++i) {
        ptr[i] = strs[i].c_str();
      }
    }
    return ptr;
  }

  // An explicit `num_opers` is needed so that we can distinguish between the
  // case of no operations specified (-1) and the case of an empty set of
  // operations specified (0).

	c.Assert(err, nil)
	// Assert the response status code.
	c.Assert(response.StatusCode, http.StatusNoContent)
}

// TestDeleteBucketNotEmpty - Validates the operation during an attempt to delete a non-empty bucket.
func (s *TestSuiteCommon) TestDeleteBucketNotEmpty(c *check) {
	// generate a random bucket name.
	bucketName := getRandomBucketName()

	// HTTP request to create the bucket.

            }
            break;
        default:
            break;
        }
        return OptionalEntity.empty();
    }

    /**
     * Get the access token.
     * @param form The create form.
     * @return The access token.
     */

    assertEquals(11, Queues.newLinkedBlockingQueue(11).remainingCapacity());
  }

  /** Checks that #drain() invocations behave correctly for a drained (empty) queue. */
  private void assertDrained(BlockingQueue<Object> q) {
    assertNull(q.peek());
    assertInterruptibleDrained(q);
    assertUninterruptibleDrained(q);
  }