Parsing XwXdXhXmXs time into number of seconds

gistfile1.java

private boolean isLong(String str) {
	try {
		Long.parseLong(str);
	}
	catch(NumberFormatException e) {
		return false;
	}
	return true;
}

public long parseTime(String time) {
	long secondsTime = -1;

	try {
		long weeks = 0;
		long days = 0;
		long hours = 0;
		long mins = 0;
		long secs = 0;

		String nums = "";
		for(int j = 0; j < time.length(); j++) {
			String c = time.substring(j, j+1);
			if(isLong(c)) {
				nums += c;
				continue;
			}

			long num = Long.parseLong(nums);
			if(c.equals("w")) weeks = num;
			else if(c.equals("d")) days = num;
			else if(c.equals("h")) hours = num;
			else if(c.equals("m")) mins = num;
			else if(c.equals("s")) secs = num;
			else throw new IllegalArgumentException("invalid time measurement: " + c);
			nums = "";
		}

		// now get the total time
		secondsTime = secs + (mins * 60) + (hours * 3600) + (days * 86400) + (weeks * 604800);
	}
	catch(Exception e) {
		error(e.getMessage());
	}
	
	return secondsTime;
}