public static PrecisionTime parsePrecisionDateTimeLiteral()

in core/src/main/java/org/apache/calcite/avatica/util/DateTimeUtils.java [224:284]
43 lines of code
11 McCabe index (conditional complexity)

  public static PrecisionTime parsePrecisionDateTimeLiteral(String s,
      DateFormat dateFormat, TimeZone tz, int maxPrecision) {
    final ParsePosition pp = new ParsePosition(0);
    final Calendar cal = parseDateFormat(s, dateFormat, tz, pp);
    if (cal == null) {
      return null; // Invalid date/time format
    }

    // Note: the Java SimpleDateFormat 'S' treats any number after
    // the decimal as milliseconds. That means 12:00:00.9 has 9
    // milliseconds and 12:00:00.9999 has 9999 milliseconds.
    int p = 0;
    String secFraction = "";
    if (pp.getIndex() < s.length()) {
      // Check to see if rest is decimal portion
      if (s.charAt(pp.getIndex()) != '.') {
        return null;
      }

      // Skip decimal sign
      pp.setIndex(pp.getIndex() + 1);

      // Parse decimal portion
      if (pp.getIndex() < s.length()) {
        secFraction = s.substring(pp.getIndex());
        if (!secFraction.matches("\\d+")) {
          return null;
        }
        NumberFormat nf = NumberFormat.getIntegerInstance(Locale.ROOT);
        Number num = nf.parse(s, pp);
        if (num == null || pp.getIndex() != s.length()) {
          // Invalid decimal portion
          return null;
        }

        // Determine precision - only support prec 3 or lower
        // (milliseconds) Higher precisions are quietly rounded away
        p = secFraction.length();
        if (maxPrecision >= 0) {
          // If there is a maximum precision, ignore subsequent digits
          p = Math.min(maxPrecision, p);
          secFraction = secFraction.substring(0, p);
        }

        // Calculate milliseconds
        String millis = secFraction;
        if (millis.length() > 3) {
          millis = secFraction.substring(0, 3);
        }
        while (millis.length() < 3) {
          millis = millis + "0";
        }

        int ms = Integer.parseInt(millis);
        cal.add(Calendar.MILLISECOND, ms);
      }
    }

    assert pp.getIndex() == s.length();
    return new PrecisionTime(cal, secFraction, p);
  }