public static int findMillisecondStart()

in src/main/java/org/apache/log4j/pattern/CachedDateFormat.java [161:217]
39 lines of code
10 McCabe index (conditional complexity)

  public static int findMillisecondStart(
    final long time, final String formatted, final DateFormat formatter) {
    long slotBegin = (time / 1000) * 1000;

    if (slotBegin > time) {
      slotBegin -= 1000;
    }

    int millis = (int) (time - slotBegin);

    int magic = MAGIC1;
    String magicString = MAGICSTRING1;

    if (millis == MAGIC1) {
      magic = MAGIC2;
      magicString = MAGICSTRING2;
    }

    String plusMagic = formatter.format(new Date(slotBegin + magic));

    /**
     *   If the string lengths differ then
     *      we can't use the cache except for duplicate requests.
     */
    if (plusMagic.length() != formatted.length()) {
      return UNRECOGNIZED_MILLISECONDS;
    } else {
      // find first difference between values
      for (int i = 0; i < formatted.length(); i++) {
        if (formatted.charAt(i) != plusMagic.charAt(i)) {
          //
          //   determine the expected digits for the base time
          StringBuffer formattedMillis = new StringBuffer("ABC");
          millisecondFormat(millis, formattedMillis, 0);

          String plusZero = formatter.format(new Date(slotBegin));

          //   If the next 3 characters match the magic
          //      string and the expected string
          if (
            (plusZero.length() == formatted.length())
              && magicString.regionMatches(
                0, plusMagic, i, magicString.length())
              && formattedMillis.toString().regionMatches(
                0, formatted, i, magicString.length())
              && ZERO_STRING.regionMatches(
                0, plusZero, i, ZERO_STRING.length())) {
            return i;
          } else {
            return UNRECOGNIZED_MILLISECONDS;
          }
        }
      }
    }

    return NO_MILLISECONDS;
  }