* @return array of character codes to be treated as spaces
     */
    protected int[] getSpaceChars() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return fessConfig.getCrawlerDocumentSpaceCharsAsArray();
    }

    /**
     * Creates a digest (abbreviated summary) of document content.
     * Truncates and normalizes content to create a summary suitable for display.
     *