// Two-byte form.
        if (index == end) {
          return false;
        }
        // Simultaneously check for illegal trailing-byte in leading position
        // and overlong 2-byte form.
        if (byte1 < (byte) 0xC2 || bytes[index++] > (byte) 0xBF) {
          return false;
        }
      } else if (byte1 < (byte) 0xF0) {
        // Three-byte form.
        if (index + 1 >= end) {

    @Execute
    public ActionResponse index(final CacheForm form) {
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_Error_ErrorJsp)));
        if (isLoginRequired()) {
            return redirectToLogin();
        }

        Map<String, Object> doc = null;
        try {
            doc = searchHelper.getDocumentByDocId(form.docId, queryFieldConfig.getCacheResponseFields(), getUserBean()).orElse(null);

    @Execute
    public ActionResponse index(final ThumbnailForm form) {
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_Error_ErrorJsp)));
        if (isLoginRequired()) {
            return redirectToLogin();
        }

        final Map<String, Object> doc =
                searchHelper.getDocumentByDocId(form.docId, queryFieldConfig.getResponseFields(), getUserBean()).orElse(null);

        form.dictId = dictId;
        validateApi(form, messages -> {});
        final StopwordsFile file = stopwordsService.getStopwordsFile(form.dictId).orElseGet(() -> {
            throwValidationErrorApi(messages -> messages.addErrorsFailedToUploadStopwordsFile(GLOBAL));
            return null;
        });
        try (InputStream inputStream = form.stopwordsFile.getInputStream()) {

    @Secured({ ROLE })
    public ActionResponse upload(final UploadForm form) {
        validate(form, messages -> {}, () -> asListHtml(null));
        verifyTokenKeep(() -> asListHtml(this::saveToken));

        String header = null;
        final StringBuilder buf = new StringBuilder(1000);
        try (final BufferedReader reader = new BufferedReader(new InputStreamReader(form.requestFile.getInputStream(), Constants.UTF_8))) {

public abstract class Escaper {
  // TODO(dbeaumont): evaluate custom implementations, considering package private constructor.
  /** Constructor for use by subclasses. */
  protected Escaper() {}

  /**
   * Returns the escaped form of a given literal string.
   *
   * <p>Note that this method may treat input characters differently depending on the specific
   * escaper implementation.
   *
   * <ul>

        if (isLoginRequired()) {
            return redirectToLogin();
        }

        return asHtml(virtualHost(path_IndexJsp)).useForm(SearchForm.class, op -> {
            op.setup(form -> {
                buildFormParams(form);
            });
        }).renderWith(data -> {
            buildInitParams();
            RenderDataUtil.register(data, "notification", fessConfig.getNotificationSearchTop());
        });
    }

   *
   */
  public static Escaper urlFormParameterEscaper() {
    return URL_FORM_PARAMETER_ESCAPER;
  }

  private static final Escaper URL_FORM_PARAMETER_ESCAPER =
      new PercentEscaper(URL_FORM_PARAMETER_OTHER_SAFE_CHARS, true);

  /**
   * Returns an {@link Escaper} instance that escapes strings so they can be safely included in <a

    @ValidateTypeFailure
    public Integer crudMode;

    @Required
    public String suggestWord;

    public String reading;

    public String targetLabel;

    @CustomSize(maxKey = "form.admin.max.input.size")
    public String permissions;

    @Required
    @ValidateTypeFailure
    public Float boost;

    @Size(max = 1000)
    public String createdBy;

    @ValidateTypeFailure

            op.setup(form -> {
                form.initialize();
                form.crudMode = CrudMode.CREATE;
                form.dictId = dictId;
            });
        });
    }

    @Execute
    @Secured({ ROLE })
    public HtmlResponse edit(final EditForm form) {
        validate(form, messages -> {}, () -> asListHtml(form.dictId));