de.gerdiproject.harvest.scheduler.utils

Class CronParser

java.lang.Object

de.gerdiproject.harvest.scheduler.utils.CronParser

public class CronParser
extends Object

This class provides static functions for parsing cron tabs.

Author:

Robin Weiss

Method Summary

Modifier and Type	Method and Description
static byte[]	parseHours(String cronTabHours) This method parses the "hours" of a cron tab and generates a byte array of all viable hours.
static byte[]	parseMinutes(String cronTabMinutes) This method parses the "minutes" of a cron tab and generates a byte array of all viable minutes.
static byte[]	parseMonthDays(String cronTabMonthDays) This method parses the "days" of a cron tab and generates a byte array of all viable month days.
static byte[]	parseMonths(String cronTabMonths, byte[] monthDays, byte[] weekDays) This method parses the "months" of a cron tab and generates a byte array of all viable months.
static byte[]	parseWeekDays(String cronTabWeekDays) This method parses the "week days" of a cron tab and generates a byte array of all viable week days, converting any 7 to a 0 to enforce the range of 0-6 even tough 1-7 is also viable.

Methods inherited from class java.lang.Object

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

Method Detail

parseMinutes

public static byte[] parseMinutes(String cronTabMinutes)
                           throws IllegalArgumentException

This method parses the "minutes" of a cron tab and generates a byte array of all viable minutes.

Parameters:

cronTabMinutes - the cron tab minutes field

Returns:

a byte array of minutes that match the cron tab

Throws:

IllegalArgumentException - thrown when the cron tab is of an illegal format

parseHours

public static byte[] parseHours(String cronTabHours)
                         throws IllegalArgumentException

This method parses the "hours" of a cron tab and generates a byte array of all viable hours.

Parameters:

cronTabHours - the cron tab hours field

Returns:

a byte array of hours that match the cron tab

Throws:

IllegalArgumentException - thrown when the cron tab is of an illegal format

parseMonthDays

public static byte[] parseMonthDays(String cronTabMonthDays)
                             throws IllegalArgumentException

This method parses the "days" of a cron tab and generates a byte array of all viable month days.

Parameters:

cronTabMonthDays - the cron tab days field

Returns:

a byte array of month days that match the cron tab

Throws:

IllegalArgumentException - thrown when the cron tab is of an illegal format

parseWeekDays

public static byte[] parseWeekDays(String cronTabWeekDays)
                            throws IllegalArgumentException

This method parses the "week days" of a cron tab and generates a byte array of all viable week days, converting any 7 to a 0 to enforce the range of 0-6 even tough 1-7 is also viable.

Parameters:

cronTabWeekDays - the cron tab week days field

Returns:

a byte array of week days [0-6] that match the cron tab

Throws:

IllegalArgumentException - thrown when the cron tab is of an illegal format

parseMonths

public static byte[] parseMonths(String cronTabMonths,
                                 byte[] monthDays,
                                 byte[] weekDays)
                          throws IllegalArgumentException

This method parses the "months" of a cron tab and generates a byte array of all viable months. By taking week days and month days into consideration, all months that are impossible to match, are removed.

Parameters:

cronTabMonths - the cron tab months field

monthDays - month days that have been parsed from the same cron tab

weekDays - week days that have been parsed from the same cron tab

Returns:

a byte array of months that match the cron tab

Throws:

IllegalArgumentException - thrown when the cron tab is of an illegal format