*
   * @since 11.0
   */
  /*
   * <? extends Object> is mostly the same as <?> to plain Java. But to nullness checkers, they
   * differ: <? extends Object> means "non-null types," while <?> means "all types."
   */
  @Override
  public ImmutableMap<K, V> getAllPresent(Iterable<? extends Object> keys) {
    Map<K, V> result = Maps.newLinkedHashMap();
    for (Object key : keys) {

      return 0;
    }

    // The rest of this method implements the process described by the CharsetEncoder javadoc.
    int totalBytesRead = 0;
    boolean doneEncoding = endOfInput;

    DRAINING:
    while (true) {
      // We stay in draining mode until there are no bytes left in the output buffer. Then we go
      // back to encoding/flushing.
      if (draining) {

        assertArgumentNotNull("disposable", disposable);
        disposables.remove(disposable);
    }

    /**
     * 登録済みのリソースを全て破棄します。
     */
    public static synchronized void dispose() {
        while (!disposables.isEmpty()) {
            final Disposable disposable = disposables.removeLast();
            try {
                disposable.dispose();
            } catch (final Throwable t) {

        Set<String> packages = new LinkedHashSet<>();

        try {
            Enumeration<URL> urls = loader.getResources(BUILDER.getExtensionDescriptorLocation());
            while (urls.hasMoreElements()) {

                try (InputStream is = urls.nextElement().openStream()) {
                    ExtensionDescriptor descriptor = BUILDER.build(is);

        MessageDigest md = MessageDigest.getInstance("SHA-1");
        try (InputStream fis = Files.newInputStream(path)) {
            byte[] buffer = new byte[SHA1_BUFFER_SIZE];
            int read;
            while ((read = fis.read(buffer)) != -1) {
                md.update(buffer, 0, read);
            }
        }
        StringBuilder result = new StringBuilder();
        for (byte b : md.digest()) {

 *     lookups) and attempt a new connection them. When failures occur, retries iterate the list of
 *     available routes.
 *
 * If the pool gains an eligible connection while DNS, TCP, or TLS work is in flight, this finder
 * will prefer pooled connections. Only pooled HTTP/2 connections are used for such de-duplication.
 *
 * It is possible to cancel the finding process by canceling its call.
 *

          }
          // Inefficient implementation that defines all letters as escapable.
          @Override
          protected int nextEscapeIndex(CharSequence csq, int index, int end) {
            while (index < end && !Character.isLetter(csq.charAt(index))) {
              index++;
            }
            return index;
          }
        };

  }

  /**
   * Returns the {@link Method} instance for {@link #testAdd_unsupportedNotPresent()} so that tests
   * can suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()} while we figure out
   * what to do with <a
   * href="https://github.com/openjdk/jdk/blob/c25c4896ad9ef031e3cddec493aef66ff87c48a7/src/java.base/share/classes/java/util/concurrent/ConcurrentHashMap.java#L4830">{@code

  }

  /**
   * Returns the {@link Method} instance for {@link #testAdd_unsupportedNotPresent()} so that tests
   * can suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()} while we figure out
   * what to do with <a
   * href="https://github.com/openjdk/jdk/blob/c25c4896ad9ef031e3cddec493aef66ff87c48a7/src/java.base/share/classes/java/util/concurrent/ConcurrentHashMap.java#L4830">{@code

          }
          // Inefficient implementation that defines all letters as escapable.
          @Override
          protected int nextEscapeIndex(CharSequence csq, int index, int end) {
            while (index < end && !Character.isLetter(csq.charAt(index))) {
              index++;
            }
            return index;
          }
        };