/**
 * A {@link Set} whose contents will never change, with many other important properties detailed at
 * {@link ImmutableCollection}.
 *
 * @since 2.0
 */
@GwtCompatible
@SuppressWarnings("serial") // we're overriding default serialization
public abstract class ImmutableSet<E> extends ImmutableCollection<E> implements Set<E> {
  // @IgnoreJRERequirement is not necessary because this compiles down to a constant.

  public ImmutableMultiset<K> keys() {
    return (ImmutableMultiset<K>) super.keys();
  }

  @Override
  ImmutableMultiset<K> createKeys() {
    return new Keys();
  }

  @SuppressWarnings("serial") // Uses writeReplace, not default serialization
  @WeakOuter
  private final class Keys extends ImmutableMultiset<K> {
    @Override
    public boolean contains(@Nullable Object object) {

    }

    /**
     * Sets the value at the specified index.
     *
     * @param index
     *            the index
     * @param value
     *            the value
     */
    public void setAt(final int index, final V value) {
        getEntryAt(index).setValue(value);
    }

    @Override
    public V remove(final Object key) {
        final Entry<K, V> e = removeMap(key);
        if (e != null) {

    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  /**
   * Returns a synchronized (thread-safe) table backed by the specified table. In order to guarantee
   * serial access, it is critical that <b>all</b> access to the backing table is accomplished
   * through the returned table.
   *
   * <p>It is imperative that the user manually synchronize on the returned table when accessing any

                    for (int i = 0; i < maxRedirectCount; i++) {
                        processedUrls.add(currentUrl);
                        if (keyObj != null) {
                            keyObj.setUrl(currentUrl);
                        }
                        crawlerStatsHelper.record(keyObj, StatsAction.PREPARED);
                        currentUrl = processRequest(paramMap, localDataMap, currentUrl, client);

  public static final byte DC1 = 17; // aka XON

  /**
   * Transmission On: Although originally defined as DC1, this ASCII control character is now better
   * known as the XON code used for software flow control in serial communications. The main use is
   * restarting the transmission after the communication has been stopped by the XOFF control code.
   *
   * @since 8.0
   */
  public static final byte XON = 17; // aka DC1

            // Do nothing in test
        }

        @Override
        public void setRuleId(String ruleId) {
            // Do nothing in test
        }

        @Override
        public void setUrl(String url) {
            // Do nothing in test
        }

        @Override
        public void setParentUrl(String parentUrl) {
            // Do nothing in test
        }

  public ImmutableMultiset<K> keys() {
    return (ImmutableMultiset<K>) super.keys();
  }

  @Override
  ImmutableMultiset<K> createKeys() {
    return new Keys();
  }

  @SuppressWarnings("serial") // Uses writeReplace, not default serialization
  @WeakOuter
  private final class Keys extends ImmutableMultiset<K> {
    @Override
    public boolean contains(@Nullable Object object) {

                        if (!favoriteLogService.addUrl(userCode, (userInfo, favoriteLog) -> {
                            favoriteLog.setUserInfoId(userInfo.getId());
                            favoriteLog.setUrl(favoriteUrl);
                            favoriteLog.setDocId(docId);
                            favoriteLog.setQueryId(queryId);

/**
 * A {@link Set} whose contents will never change, with many other important properties detailed at
 * {@link ImmutableCollection}.
 *
 * @since 2.0
 */
@GwtCompatible
@SuppressWarnings("serial") // we're overriding default serialization
public abstract class ImmutableSet<E> extends ImmutableCollection<E> implements Set<E> {
  static final int SPLITERATOR_CHARACTERISTICS =