Time parsing method

Heyho Community,
I just wrote a method to parse a string, which holds a time, so I want to share it with you and maybe improve it.

Code:

private static final long DAY = 86400000L;
private  static final long HOUR = 3600000L;
private  static final long MINUTE = 60000L;
private  static final long SECOND = 1000L;
 
private static final char DAY_CHAR = 'd', HOUR_CHAR = 'h', MINUTE_CHAR = 'm', SECOND_CHAR = 's';
 
       /**
     * This parses a String which holds a time and returns the duration in ms.
     * <p/>
     * <p><strong>Example:</strong> 2d5h2m52s</p>
     *
     * @param time The string to parse
     * @return The duration in ms
     */
    public static long parseTime(String time)
    {
        char[] chars = time.toCharArray();
 
        long duration = 0;
 
        long current = 0;
        int run = 1;
        long multi = 1;
 
        //iterate backwards
        for (int i = chars.length - 1; i >= 0; i--) {
            char character = chars[i];
            int currentNumber = getDigit(character);
 
            if (currentNumber != -1) {
                //is number
                //set the value of the current iteration
                current += currentNumber * run;
                //add the current value to the whole
                duration += current * multi;
                //we set our run '* 10' because: 112 = 1 * 100 + 1 * 10 + 2 * 1
                run *= 10;
            } else {
                //is character
                //lets find our multiplicator
                switch (character) {
                    case DAY_CHAR:
                        multi = DAY;
                        break;
                    case HOUR_CHAR:
                        multi = HOUR;
                        break;
                    case MINUTE_CHAR:
                        multi = MINUTE;
                        break;
                    case SECOND_CHAR:
                        multi = SECOND;
                        break;
                    case ' ':
                    case '_':
                        continue;
                    default:
                        throw new IllegalArgumentException(String.format("Invalid character found! %s", character));
                }
                //everytime we get a new character which signs the multiplicator we reset our values
                current = 0;
                run = 1;
            }
        }
 
        return duration;
    }
 
    /**
     * Returns the number of a character. '9' will return the integer 9, '2' will return the integer 2
     *
     * @param character The character to parse
     * @return The integer which matches, or -1 if the parse fails
     */
    public static int getDigit(int character)
    {
        final int MINIMAL_DIGIT = 48, MAXIMAL_DIGIT = 57;
 
        if (character >= MINIMAL_DIGIT && character <= MAXIMAL_DIGIT) {
            return character - MINIMAL_DIGIT;
        }
 
        return -1;
    }

50d21h5m55s will return 4399560000. Currently it supports only lower-case characters and it will break if there is any other character, which is not "parse-able".

EDIT: Replaced the digit method. It's much faster now!

p000ison

 

Code:java

 
SimpleDateFormat dateFormat = new SimpleDateFormat("d'd'k'h'm'm's's'");
 
public static long parseTime(String time) {
    Date date = dateFormat.parse(time);
    return date.getTime();
}
 
 

This should also work.

 

k true, but also about 15 times slower