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;
                }

**Extractor**: Weight-based selection (tries in descending weight order)

### Key Extractors

`TikaExtractor` (1000+ formats), `PdfExtractor`, `MsWordExtractor`, `MsExcelExtractor`, `MsPowerPointExtractor`, `ZipExtractor`, `HtmlExtractor`, etc.

**Registration**:
```java
extractorFactory.addExtractor("text/html", htmlExtractor, 2);  // Weight 2

                                <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">

     * @param parentUrl the parent URL that referenced this child URL
     * @param weight the weight/priority of the child URL
     * @param depth the crawling depth of the child URL
     */
    @Override
    protected void storeChildUrl(final String childUrl, final String parentUrl, final float weight, final int depth) {
        if (StringUtil.isNotBlank(childUrl)) {

    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 {

    /**
     * Constructs a new CsvExtractor.
     */
    public CsvExtractor() {
        super();
    }

    @Override
    public int getWeight() {
        return 2; // Higher priority than TikaExtractor (weight=1)
    }

    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        validateInputStream(in);

        final Charset charset = getCharset(params);

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>