}

    private void recompute() {
      recomputeMultiset();
      recomputeHeight();
    }

    private AvlNode<E> rebalance() {
      switch (balanceFactor()) {
        case -2:
          // requireNonNull is safe because right must exist in order to get a negative factor.
          requireNonNull(right);
          if (right.balanceFactor() > 0) {

        }
    }

    private void assertImageSize(File file, int width, int height) throws IOException {
        BufferedImage img = ImageIO.read(file);
        logger.debug("width: {}, height: {}", img.getWidth(), img.getHeight());
        assertEquals("Image Width", width, img.getWidth());
        assertEquals("Image Height", height, img.getHeight());
    }

                final int width = reader.getWidth(0);
                final int height = reader.getHeight(0);
                if (width <= 0 || height <= 0) {
                    return Result.NO_IMAGE;
                }
                if (!fessConfig.validateThumbnailSize(width, height)) {
                    return Result.INVALID_SIZE;
                }

        data = "<img src=\"http://example/foo.jpg\" width=\"x\" height=\"x\">";
        assertNull(transformer.getThumbnailUrl(responseData, getDocument(data)));

        data = "<img src=\"http://example/foo.jpg\" width=\"10\" height=\"100\">";
        assertNull(transformer.getThumbnailUrl(responseData, getDocument(data)));

        data = "<img src=\"http://example/foo.jpg\" width=\"100\" height=\"10\">";

    java.math.BigDecimal getThumbnailHtmlImageMaxAspectRatioAsDecimal();

    default boolean validateThumbnailSize(final int width, final int height) {
        if (width <= 0 || height <= 0 || width < getThumbnailHtmlImageMinWidthAsInteger().intValue()
                || height < getThumbnailHtmlImageMinHeightAsInteger().intValue()) {
            return false;
        }

                final Integer height = getAttributeAsInteger(attributes, "height");
                final Integer width = getAttributeAsInteger(attributes, "width");
                if (!fessConfig.isThumbnailHtmlImageUrl(thumbnailUrl)) {
                    continue;
                }
                if (height != null && width != null) {
                    try {

thumbnail.html.image.min.width=100
# Minimum height for HTML images in thumbnails.
thumbnail.html.image.min.height=100
# Maximum aspect ratio for HTML images in thumbnails.
thumbnail.html.image.max.aspect.ratio=3.0
# Width of generated thumbnail images.
thumbnail.html.image.thumbnail.width=100
# Height of generated thumbnail images.
thumbnail.html.image.thumbnail.height=100
# Format of generated thumbnail images.

     * The value is, e.g. 100 <br>
     * comment: Minimum height for HTML images in thumbnails.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getThumbnailHtmlImageMinHeight();

    /**
     * Get the value for the key 'thumbnail.html.image.min.height' as {@link Integer}. <br>

    checkArgument(maximumWeight >= 0, "maximum weight must not be negative");
    this.maximumWeight = maximumWeight;
    return this;
  }

  /**
   * Specifies the weigher to use in determining the weight of entries. Entry weight is taken into
   * consideration by {@link #maximumWeight(long)} when determining which entries to evict, and use

                                <h4><la:message key="labels.general_menu_system"/></h4>
                                <div class="form-group row">
                                    <span class="font-weight-bold col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.web_api_json_enabled"/></span>
                                    <div class="form-inline col-sm-9">