static final class Helper<K, V>
        implements InternalEntryHelper<
            K, V, StrongKeyStrongValueEntry<K, V>, StrongKeyStrongValueSegment<K, V>> {
      private static final Helper<?, ?> INSTANCE = new Helper<>();

      @SuppressWarnings("unchecked")
      static <K, V> Helper<K, V> instance() {
        return (Helper<K, V>) INSTANCE;
      }

      @Override

                return actualOsName.contains(FAMILY_OPENVMS);
            default:
                return actualOsName.contains(family.toLowerCase(Locale.US));
        }
    }

    /**
     * Helper method to determine the current OS family.
     *
     * @return name of current OS family.
     */
    private static String getOsFamily() {
        return Stream.of(
                        FAMILY_DOS,

    return "z";
  }

  @Override
  protected String getValueNotInPopulatedMap() throws UnsupportedOperationException {
    return "26";
  }

  /** Helper assertion comparing two maps */
  private void assertMapsEqual(Map<?, ?> expected, Map<?, ?> map) {
    assertEquals(expected, map);
    assertEquals(expected.hashCode(), map.hashCode());

    String PAGE_PATH_MAPPING_MAX_FETCH_SIZE = "page.path.mapping.max.fetch.size";

    /** The key of the configuration. e.g. 1000 */
    String PAGE_REQUEST_HEADER_MAX_FETCH_SIZE = "page.request.header.max.fetch.size";

    /** The key of the configuration. e.g. 100 */
    String PAGE_SCHEDULED_JOB_MAX_FETCH_SIZE = "page.scheduled.job.max.fetch.size";

        }
    }

    /**
     * {@link Reader}からテキストを読み込みます。
     * <p>
     * {@link Reader}はクローズされません。
     * </p>
     *
     * @param reader
     *            読み込み文字ストリーム。{@literal null}であってはいけません
     * @return テキスト
     */
    public static String readText(final Reader reader) {
        assertArgumentNotNull("reader", reader);

        final StringBuilder buf = new StringBuilder(BUF_SIZE);

        Path path = request.getPath();
        URL url = request.getURL();
        Reader reader = request.getReader();
        InputStream inputStream = request.getInputStream();
        if (path == null && url == null && reader == null && inputStream == null) {
            throw new IllegalArgumentException("path, url, reader or inputStream must be non null");
        }
        try {

    Serialization.getFieldSetter(TreeMultiset.class, "rootReference")
        .set(this, new Reference<AvlNode<E>>());
    AvlNode<E> header = new AvlNode<>();
    Serialization.getFieldSetter(TreeMultiset.class, "header").set(this, header);
    successor(header, header);
    Serialization.populateMultiset(this, stream);
  }

  @GwtIncompatible // not needed in emulated source
  @J2ktIncompatible

     *
     * @param reader
     *            リーダー
     * @return ラップされたリーダー
     */
    protected static Reader wrap(final Reader reader) {
        if (reader instanceof BufferedReader) {
            return reader;
        }
        if (reader instanceof StringReader) {
            return reader;
        }
        return new BufferedReader(reader, DEFAULT_BUF_SIZE);
    }

    /**
     * Test method for
     * {@link org.codelibs.core.io.PropertiesUtil#load(java.util.Properties, java.io.Reader)}
     * .
     */
    @Test
    public void testLoadPropertiesReaderReaderNull() {
        exception.expect(NullArgumentException.class);
        exception.expectMessage(is("[ECL0008]argument[reader] is null."));
        final InputStreamReader inputStreamReader = null;

    ImmutableListMultimap.Builder<String, Integer> builder = new Builder<>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry =
        new AbstractMapEntry<String, Integer>() {
          @Override
          public String getKey() {
            return holder.string;
          }

          @Override
          public Integer getValue() {