code: public String getToolTip() {
          StringBuilder message = new StringBuilder();
          message.append("<p>");
          message.append(Messages.DRY_Duplications_Header());
          message.append("<ul>");
          for (DuplicateCode duplication : links) {
              message.append("<li>");
              message.append(String.format("<a href=\"link.%s.%s/#%s\">%s (%s)</a>",
                      getKey(), duplication.getKey(), duplication.getPrimaryLineNumber(),
                      duplication.getLinkName(), duplication.getPrimaryLineNumber()));
              message.append("</li>");
          }
          message.append("</ul>");
          message.append("</p>");
          return message.toString();
      }
docs: {@inheritDoc}