de.gerdiproject.harvest.scheduler.utils

Class CronUtils

java.lang.Object

de.gerdiproject.harvest.scheduler.utils.CronUtils

public class CronUtils
extends Object

This class contains static utility functions that work on cron tabs and cron related date.

Author:

Robin Weiss

Method Summary

Modifier and Type	Method and Description
static int	getDaysInMonth(byte month, int year) Calculates the amount of days of a month in a specified year.
static Date	getNextMatchingDate(String cronTab) Uses the cron tab to calculate the first matching date after the current date + one minute.
static Date	getNextMatchingDate(String cronTab, Date earliestPossibleDate) Uses the cron tab to calculate the first date that is equal or later than a specified date.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getNextMatchingDate

public static Date getNextMatchingDate(String cronTab)
                                throws IllegalArgumentException

Uses the cron tab to calculate the first matching date after the current date + one minute.

Parameters:

cronTab - the crontab of which the next date is to be generated

Returns:

the first cron-matching date after the current date + one minute

Throws:

IllegalArgumentException

getNextMatchingDate

public static Date getNextMatchingDate(String cronTab,
                                       Date earliestPossibleDate)
                                throws IllegalArgumentException

Uses the cron tab to calculate the first date that is equal or later than a specified date.

Parameters:

cronTab - the crontab of which the next date is to be generated

earliestPossibleDate - the earliest date that is allowed to match

Returns:

the first cron-matching date after the current date + one minute

Throws:

IllegalArgumentException

getDaysInMonth

public static int getDaysInMonth(byte month,
                                 int year)

Calculates the amount of days of a month in a specified year.

Parameters:

month - the month of which the number of days are returned

year - the year of the month

Returns:

the amount of days of a month in a specified year