// and If-Unmodified-Since headers set are validated.
// If-Modified-Since - Return the object only if it has been modified since the specified time, else return a 304 (not modified).
// If-Unmodified-Since - Return the object only if it has not been modified since the specified time, else return a 412 (precondition failed).
func (s *TestSuiteCommon) TestHeadOnObjectLastModified(c *check) {
	// generate a random bucket name.

    // ceil(199*index/2).
    if (index % 2 == 0) {
      int position = IntMath.divide(199 * index, 2, UNNECESSARY);
      return PSEUDORANDOM_DATASET_SORTED.get(position);
    } else {
      int positionFloor = IntMath.divide(199 * index, 2, FLOOR);
      int positionCeil = IntMath.divide(199 * index, 2, CEILING);
      double lowerValue = PSEUDORANDOM_DATASET_SORTED.get(positionFloor);

    Set<Feature<?>> features = computeMultimapAsMapGetFeatures(parentBuilder.getFeatures());
    if (Collections.disjoint(features, EnumSet.allOf(CollectionSize.class))) {
      return new TestSuite();
    } else {
      return CollectionTestSuiteBuilder.using(
              new MultimapAsMapGetGenerator<K, V, M>(parentBuilder.getSubjectGenerator()))
          .withFeatures(features)

    // ceil(199*index/2).
    if (index % 2 == 0) {
      int position = IntMath.divide(199 * index, 2, UNNECESSARY);
      return PSEUDORANDOM_DATASET_SORTED.get(position);
    } else {
      int positionFloor = IntMath.divide(199 * index, 2, FLOOR);
      int positionCeil = IntMath.divide(199 * index, 2, CEILING);
      double lowerValue = PSEUDORANDOM_DATASET_SORTED.get(positionFloor);

    Monitor monitor = this.monitor;
    if (monitor.enterWhen(notEmpty, timeout, unit)) {
      try {
        return q.poll();
      } finally {
        monitor.leave();
      }
    } else {
      return null;
    }
  }

  @CanIgnoreReturnValue // pushed down from class to method
  @Override
  public E take() throws InterruptedException {
    Monitor monitor = this.monitor;

	if err != nil {
		if !globalIsErasure && !globalIsDistErasure && errors.Is(err, errVolumeNotFound) {
			// Only single drive mode needs this fallback.
			meta = newBucketMetadata(bucket)
		} else {
			return updatedAt, err
		}
	}
	updatedAt = UTCNow()
	switch configFile {
	case bucketPolicyConfig:
		meta.PolicyConfigJSON = configData
		meta.PolicyConfigUpdatedAt = updatedAt

                map.put("directory", item.isDirectory());
                if (!item.isDirectory()) {
                    map.put("lastModified", item.getLastModified());
                    fileList.add(map);
                } else {
                    list.add(map);
                }
            }
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {

            if (fqdn == null) {
                DfsReferralDataImpl impl = createInitializedDfsReferralDataImpl();
                assertThrows(NullPointerException.class, () -> impl.fixupHost(fqdn));
            } else {
                // Empty string is handled
                DfsReferralDataImpl impl = createInitializedDfsReferralDataImpl();
                assertDoesNotThrow(() -> impl.fixupHost(fqdn));
            }
        }

				s.setErr(err)
				return false
			}
			if !s.advance(advance) {
				return false
			}
			s.token = token
			if token != nil {
				if s.err == nil || advance > 0 {
					s.empties = 0
				} else {
					// Returning tokens not advancing input at EOF.
					s.empties++
					if s.empties > maxConsecutiveEmptyReads {
						panic("bufio.Scan: too many empty tokens without progressing")
					}
				}

	e.init.Do(func() {
		e.cached.Store(&AccElem{})
		atomic.StoreInt64(&e.cachedSec, t)
	})
	acc := e.cached.Load()
	if lastT := atomic.LoadInt64(&e.cachedSec); lastT != t {
		// Check if lastT was changed by someone else.
		if atomic.CompareAndSwapInt64(&e.cachedSec, lastT, t) {
			// Now we swap in a new.
			newAcc := &AccElem{}
			old := e.cached.Swap(newAcc)
			var a AccElem
			a.Size = atomic.LoadInt64(&old.Size)