dropwizard-jobs/dropwizard-jobs

package io.dropwizard.jobs.parser;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/*
 * This code is ripped of the playframework, see original here
 * https://github.com/playframework/play/blob/master/framework/src/play/libs/Time.java
 */
public class TimeParserUtil {

    private static Pattern days = Pattern.compile("^([0-9]+)d$");
    private static Pattern hours = Pattern.compile("^([0-9]+)h$");
    private static Pattern minutes = Pattern.compile("^([0-9]+)mi?n?$");
    private static Pattern seconds = Pattern.compile("^([0-9]+)s$");
    private static Pattern milliseconds = Pattern.compile("^([0-9]+)ms$");

    /**
     * Parse a duration
     * 
     * @param duration
     *            1d, 3h, 2mn, 7s, 50ms
     * @return The number of milliseconds
     */
    public static long parseDuration(String duration) {
        if (duration == null || duration.isEmpty()) {
            throw new IllegalArgumentException("duration may not be null");
        }
        long toAdd = -1;
        if (days.matcher(duration).matches()) {
            Matcher matcher = days.matcher(duration);
            matcher.matches();
            toAdd = Long.parseLong(matcher.group(1)) * 60 * 60 * 24 * 1000;
        } else if (hours.matcher(duration).matches()) {
            Matcher matcher = hours.matcher(duration);
            matcher.matches();
            toAdd = Long.parseLong(matcher.group(1)) * 60 * 60 * 1000;
        } else if (minutes.matcher(duration).matches()) {
            Matcher matcher = minutes.matcher(duration);
            matcher.matches();
            toAdd = Long.parseLong(matcher.group(1)) * 60 * 1000;
        } else if (seconds.matcher(duration).matches()) {
            Matcher matcher = seconds.matcher(duration);
            matcher.matches();
            toAdd = Long.parseLong(matcher.group(1)) * 1000;
        } else if (milliseconds.matcher(duration).matches()) {
            Matcher matcher = milliseconds.matcher(duration);
            matcher.matches();
            toAdd = Long.parseLong(matcher.group(1));
        }
        if (toAdd == -1) {
            throw new IllegalArgumentException("Invalid duration pattern : " + duration);
        }
        return toAdd;
    }

}