code: private static float getLinkDensity(Element e) {
          Elements links = getElementsByTag(e, "a");
          int textLength = getInnerText(e, true).length();
          float linkLength = 0.0F;
          for (Element link : links) {
              linkLength += getInnerText(link, true).length();
          }
          return linkLength / textLength;
      }
docs: Get the density of links as a percentage of the content. This is the
  amount of text that is inside a link divided by the total text in the
  node.
  
  @param e
  @return