code: protected static Integer getSingleIntegerParam(List<String> list) {
          String s = getSingleParam(list);
          if (s != null) {
              try {
                  return Integer.valueOf(s);
              } catch (NumberFormatException e) {
                  return null;
              }
          }
          return null;
      }
docs: Return a single Integer parameter.
  
  @param list a {@link java.util.List} object.
  @return a {@link java.lang.Integer} object.