public static String parseToHtmlDecimal(String input) {
    return parseToHtmlDecimal(input, FitzpatrickAction.PARSE);
  }
See {@link #parseToHtmlDecimal(String, FitzpatrickAction)} with the action
"PARSE"

@param input the string to parse

@return the string with the emojis replaced by their html decimal
representation.
src/main/java/com/vdurmont/emoji/EmojiParser.java