* Unused stub class, unreferenced under Java and manually emulated under GWT.
 *
 * @author Chris Povirk
 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
abstract class ForwardingImmutableMap<K, V> {
  private ForwardingImmutableMap() {}

 * Unused stub class, unreferenced under Java and manually emulated under GWT.
 *
 * @author Chris Povirk
 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
abstract class ForwardingImmutableMap<K, V> {
  private ForwardingImmutableMap() {}

 */
@ElementTypesAreNonnullByDefault
public abstract class ForwardingImmutableMap<K, V> extends ImmutableMap<K, V> {

  final transient Map<K, V> delegate;

  ForwardingImmutableMap(Map<? extends K, ? extends V> delegate) {
    this.delegate = Collections.unmodifiableMap(delegate);
  }

  @SuppressWarnings("unchecked")
  ForwardingImmutableMap(boolean throwIfDuplicateKeys, Entry<? extends K, ? extends V>... entries) {

 * willing to deserialize maps that were this type on the server.
 */
@ElementTypesAreNonnullByDefault
final class JdkBackedImmutableMap<K, V> extends ForwardingImmutableMap<K, V> {
  JdkBackedImmutableMap(Map<? extends K, ? extends V> delegate) {
    super(delegate);
  }

 * to avoid code-size bloat.
 *
 * @author Hayward Chan
 */
@ElementTypesAreNonnullByDefault
final class ImmutableEnumMap<K, V> extends ForwardingImmutableMap<K, V> {
  static <K, V> ImmutableMap<K, V> asImmutable(Map<K, V> map) {
    for (Entry<K, V> entry : checkNotNull(map).entrySet()) {
      checkNotNull(entry.getKey());
      checkNotNull(entry.getValue());
    }

import java.util.Map;

/**
 * GWt emulation of {@link RegularImmutableMap}.
 *
 * @author Hayward Chan
 */
@ElementTypesAreNonnullByDefault
final class RegularImmutableMap<K, V> extends ForwardingImmutableMap<K, V> {

  static final ImmutableMap<Object, Object> EMPTY = new RegularImmutableMap<Object, Object>();

  RegularImmutableMap(Map<? extends K, ? extends V> delegate) {
    super(delegate);
  }

/**
 * GWT emulation of {@link com.google.common.collect.ImmutableBiMap}.
 *
 * @author Hayward Chan
 */
@ElementTypesAreNonnullByDefault
public abstract class ImmutableBiMap<K, V> extends ForwardingImmutableMap<K, V>
    implements BiMap<K, V> {
  public static <T extends @Nullable Object, K, V>
      Collector<T, ?, ImmutableBiMap<K, V>> toImmutableBiMap(
          Function<? super T, ? extends K> keyFunction,

 * around a {@link java.util.TreeMap}.
 *
 * @author Hayward Chan
 */
@ElementTypesAreNonnullByDefault
public final class ImmutableSortedMap<K, V> extends ForwardingImmutableMap<K, V>
    implements SortedMap<K, V> {

  @SuppressWarnings("unchecked")
  static final Comparator<?> NATURAL_ORDER = Ordering.natural();