}

  // enum singleton pattern
  private enum ToStringFunction implements Function<Object, String> {
    INSTANCE;

    @Override
    public String apply(Object o) {
      checkNotNull(o); // eager for GWT.
      return o.toString();
    }

    @Override
    public String toString() {
      return "Functions.toStringFunction()";
    }
  }

  /**
   * Returns the identity function.
   *

    @Override
    public Object getBean() {
        return bean;
    }

    @Override
    public DefaultBeanConfigurationRequest setBean(Object bean) {
        this.bean = bean;
        return this;
    }

    @Override
    public Object getConfiguration() {
        return configuration;
    }

    @Override
    public String getConfigurationElement() {

            private static final long serialVersionUID = 1L;

            @Override
            public String getUserId() {
                return Constants.EMPTY_USER_ID;
            }

            @Override
            public boolean hasRoles(final String[] acceptedRoles) {
                return true;
            }

            @Override
            public String[] getRoles() {

  abstract E get(int index);

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

  @Override
  @GwtIncompatible
  int copyIntoArray(@Nullable Object[] dst, int offset) {
    return asList().copyIntoArray(dst, offset);
  }

  @Override
  ImmutableList<E> createAsList() {
    return new ImmutableList<E>() {
      @Override
      public E get(int index) {

    override val timestampNs: Long,
    override val call: Call,
  ) : CallEvent()

  data class CacheHit(
    override val timestampNs: Long,
    override val call: Call,
  ) : CallEvent()

  data class CacheMiss(
    override val timestampNs: Long,
    override val call: Call,
  ) : CallEvent()

  data class CacheConditionalHit(
    override val timestampNs: Long,
    override val call: Call,

      }

      @Override
      public @Nullable Spliterator<T> trySplit() {
        Spliterator.OfInt split = delegate.trySplit();
        return (split == null) ? null : new WithCharacteristics(split);
      }

      @Override
      public long estimateSize() {
        return delegate.estimateSize();
      }

      @Override
      public int characteristics() {
        return Spliterator.ORDERED

    }
  }

  @Override
  public @Nullable Entry<E> firstEntry() {
    return isEmpty() ? null : getEntry(0);
  }

  @Override
  public @Nullable Entry<E> lastEntry() {
    return isEmpty() ? null : getEntry(length - 1);
  }

  @Override
  public int count(@Nullable Object element) {
    int index = elementSet.indexOf(element);
    return (index >= 0) ? getCount(index) : 0;
  }

            @Override
            public void resetBuffer() {
            }

            @Override
            public boolean isCommitted() {
                return false;
            }

            @Override
            public void reset() {
            }

            @Override
            public void setLocale(java.util.Locale loc) {
            }

            @Override

  public UnixDomainServerSocketFactory(File path) {
    this.path = path;
  }

  @Override public ServerSocket createServerSocket() throws IOException {
    return new UnixDomainServerSocket();
  }

  @Override public ServerSocket createServerSocket(int port) throws IOException {
    return createServerSocket();
  }

  @Override public ServerSocket createServerSocket(int port, int backlog) throws IOException {

      }
      toRemove = -1;
    }
  }

  @Override
  Iterator<E> elementIterator() {
    return new Itr<E>() {
      @Override
      E output(int index) {
        return enumConstants[index];
      }
    };
  }

  @Override
  Iterator<Entry<E>> entryIterator() {
    return new Itr<Entry<E>>() {
      @Override
      Entry<E> output(int index) {