this.delegate = delegate;
    this.delegateList = delegateList;
  }

  RegularImmutableAsList(ImmutableCollection<E> delegate, Object[] array) {
    this(delegate, ImmutableList.<E>asImmutableList(array));
  }

  RegularImmutableAsList(ImmutableCollection<E> delegate, Object[] array, int size) {
    this(delegate, ImmutableList.<E>asImmutableList(array, size));
  }

  @Override

    return map.keyIterator();
  }

  @Override
  public Spliterator<K> spliterator() {
    return map.keySpliterator();
  }

  @Override
  public boolean contains(@CheckForNull Object object) {
    return map.containsKey(object);
  }

  @Override
  K get(int index) {
    return map.entrySet().asList().get(index).getKey();
  }

  @Override
  public void forEach(Consumer<? super K> action) {

    super(Ordering.from(forward.comparator()).reverse());
    this.forward = forward;
  }

  @Override
  public boolean contains(@CheckForNull Object object) {
    return forward.contains(object);
  }

  @Override
  public int size() {
    return forward.size();
  }

  @Override
  public UnmodifiableIterator<E> iterator() {
    return forward.descendingIterator();
  }

/// tip

You could use any other SQL or NoSQL database library you want (in some cases called <abbr title="Object Relational Mapper, a fancy term for a library where some classes represent SQL tables and instances represent rows in those tables">"ORMs"</abbr>), FastAPI doesn't force you to use anything. 😎

///

  public void testWildcardFuture() {
    SettableFuture<String> settable = SettableFuture.create();
    ListenableFuture<?> f = settable;
    FutureCallback<Object> callback =
        new FutureCallback<Object>() {
          @Override
          public void onSuccess(Object result) {}

          @Override
          public void onFailure(Throwable t) {}
        };
    addCallback(f, callback, directExecutor());
  }

    private final Object keys;
    private final Object values;

    SerializedForm(ImmutableMap<K, V> map) {
      if (USE_LEGACY_SERIALIZATION) {
        Object[] keys = new Object[map.size()];
        Object[] values = new Object[map.size()];
        int i = 0;
        // "extends Object" works around https://github.com/typetools/checker-framework/issues/3013

        // nothing
    }

    @Override
    public void invokeQuery(String columnFlexibleName, String conditionKeyName, Object conditionValue, ConditionOption conditionOption) {
        // nothing
    }

    @Override
    public void invokeQueryEqual(String columnFlexibleName, Object conditionValue) {
        // nothing
    }

        // nothing
    }

    @Override
    public void invokeQuery(String columnFlexibleName, String conditionKeyName, Object conditionValue, ConditionOption conditionOption) {
        // nothing
    }

    @Override
    public void invokeQueryEqual(String columnFlexibleName, Object conditionValue) {
        // nothing
    }

        final String scoreField = fessConfig.getRankFusionScoreField();
        final Map<String, Map<String, Object>> scoreDocMap = new HashMap<>();
        final String idField = fessConfig.getIndexFieldId();
        final Set<Object> mainIdSet = new HashSet<>();
        for (int i = 0; i < results.length; i++) {
            final List<Map<String, Object>> docList = results[i].getDocumentList();
            if (logger.isDebugEnabled()) {

    }

    @Override
    public void acceptAllColumnMap(Entity entity, Map<String, ? extends Object> allColumnMap) {
    }

    @Override
    public Map<String, Object> extractPrimaryKeyMap(Entity entity) {
        return null;
    }

    @Override
    public Map<String, Object> extractAllColumnMap(Entity entity) {
        return null;