type headerRewriter struct{}

// Clean up IP in case if it is ipv6 address and it has {zone} information in it, like
// "[fe80::d806:a55d:eb1b:49cc%vEthernet (vmxnet3 Ethernet Adapter - Virtual Switch)]:64692"
func ipv6fix(clientIP string) string {
	return strings.Split(clientIP, "%")[0]
}

func (rw *headerRewriter) Rewrite(req *http.Request) {

	if err := dec.DecodeElement(&dest, &start); err != nil {
		return err
	}
	parsedDest, err := parseDestination(dest.Bucket)
	if err != nil {
		return err
	}
	if dest.StorageClass != "" {
		switch dest.StorageClass {
		case "STANDARD", "REDUCED_REDUNDANCY":
		default:
			return fmt.Errorf("unknown storage class %s", dest.StorageClass)
		}
	}
	parsedDest.StorageClass = dest.StorageClass
	*d = parsedDest

     *
     * @return requested resources or -1 if unknown
     */
    public long getRequestedResources() {
        return requestedResources;
    }

    private String generateRecoveryHint() {
        switch (resourceType) {
        case FILE_HANDLE:
            return "Close unused file handles or increase the file handle limit";
        case CONNECTION:

	st.totalS3Requests.Inc(api)

	// Increment the prometheus http request response histogram with appropriate label
	httpRequestsDuration.With(prometheus.Labels{"api": api}).Observe(w.TTFB().Seconds())

	code := w.StatusCode

	switch {
	case code == 0:
	case code == 499:
		// 499 is a good error, shall be counted as canceled.
		st.totalS3Canceled.Inc(api)

				field.Schema.DeleteClauses = append(field.Schema.DeleteClauses, fc.DeleteClauses(field)...)
			}
		}
	}

	if field := schema.PrioritizedPrimaryField; field != nil {
		switch field.GORMDataType {
		case Int, Uint:
			if _, ok := field.TagSettings["AUTOINCREMENT"]; !ok {
				if !field.HasDefaultValue || field.DefaultValueInterface != nil {

    return copyOf(Arrays.asList(elements));
  }

  private static <E> ImmutableList<E> copyFromCollection(Collection<? extends E> collection) {
    Object[] elements = collection.toArray();
    switch (elements.length) {
      case 0:
        return of();
      case 1:
        @SuppressWarnings("unchecked") // safe because it came from `collection`
        E element = (E) elements[0];
        return of(element);

@GwtCompatible
@SuppressWarnings("serial") // we're overriding default serialization
final class ImmutableEnumSet<E extends Enum<E>> extends ImmutableSet<E> {
  static <E extends Enum<E>> ImmutableSet<E> asImmutable(EnumSet<E> set) {
    switch (set.size()) {
      case 0:
        return ImmutableSet.of();
      case 1:
        return ImmutableSet.of(getOnlyElement(set));
      default:
        return new ImmutableEnumSet<>(set);
    }
  }

  /*

    //                                                                       ============
    private static OptionalEntity<User> getEntity(final CreateForm form) {
        switch (form.crudMode) {
        case CrudMode.CREATE:
            return OptionalEntity.of(new User()).map(entity -> {
                entity.setId(Base64.getUrlEncoder().encodeToString(form.name.getBytes(Constants.CHARSET_UTF_8)));

        assertNotNull(rp);
        assertEquals(name, rp.name(), "name() must match input");
        assertEquals(name, rp.toString(), "toString() should default to name()");
        // Ordinal is consistent with declaration order
        switch (name) {
        case "NONE":
            assertEquals(0, rp.ordinal());
            break;
        case "NO_TIMEOUT":
            assertEquals(1, rp.ordinal());
            break;

		copy(pathExpr[1:], e.PathExpr)
	}
	e.strippedTableAlias = tableAlias
	e.strippedPathExpr = pathExpr
	return e.strippedPathExpr
}

func (e *JSONPathElement) String() string {
	switch {
	case e.Key != nil:
		return e.Key.String()
	case e.Index != nil:
		return fmt.Sprintf("[%d]", *e.Index)
	case e.ObjectWildcard:
		return ".*"
	case e.ArrayWildcard:
		return "[*]"
	}
	return ""
}