code: public static String[][] parse(String s) throws IOException {
          if (s == null) {
              throw new IllegalArgumentException("Null argument not allowed.");
          }
          String[][] result = (new CSVParser(new StringReader(s), CSVStrategy.DEFAULT_STRATEGY)).getAllValues();
          if (result == null) {
              // since CSVStrategy ignores empty lines an empty array is returned
              // (i.e. not "result = new String[][] {{""}};")
              result = EMPTY_DOUBLE_STRING_ARRAY;
          }
          return result;
      }
docs: Parses the given String according to the default {@link CSVStrategy}.
  
  @param s CSV String to be parsed.
  @return parsed String matrix (which is never null)
  @throws IOException in case of error