org.springframework.scheduling.support

Class CronSequenceGenerator

java.lang.Object

org.springframework.scheduling.support.CronSequenceGenerator

public class CronSequenceGenerator
extends Object

Date sequence generator for a Crontab pattern, allowing clients to specify a pattern that the sequence matches.

The pattern is a list of six single space-separated fields: representing second, minute, hour, day, month, weekday. Month and weekday names can be given as the first three letters of the English names.

Example patterns:

• "0 0 * * * *" = the top of every hour of every day.
• "*/10 * * * * *" = every ten seconds.
• "0 0 8-10 * * *" = 8, 9 and 10 o'clock of every day.
• "0 0/30 8-10 * * *" = 8:00, 8:30, 9:00, 9:30 and 10 o'clock every day.
• "0 0 9-17 * * MON-FRI" = on the hour nine-to-five weekdays
• "0 0 0 25 12 ?" = every Christmas Day at midnight

Since:

3.0

Author:

Dave Syer, Juergen Hoeller

See Also:

CronTrigger

Constructor Summary

Constructors

Constructor and Description
CronSequenceGenerator(String expression) Construct a CronSequenceGenerator from the pattern provided, using the default TimeZone.
CronSequenceGenerator(String expression, TimeZone timeZone) Construct a CronSequenceGenerator from the pattern provided, using the specified TimeZone.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
int	hashCode()
Date	next(Date date) Get the next Date in the sequence matching the Cron pattern and after the value provided.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CronSequenceGenerator

public CronSequenceGenerator(String expression)

Construct a CronSequenceGenerator from the pattern provided, using the default TimeZone.

Parameters:

expression - a space-separated list of time fields

Throws:

IllegalArgumentException - if the pattern cannot be parsed

See Also:

TimeZone.getDefault()

CronSequenceGenerator

public CronSequenceGenerator(String expression,
                             TimeZone timeZone)

Construct a CronSequenceGenerator from the pattern provided, using the specified TimeZone.

Parameters:

expression - a space-separated list of time fields

timeZone - the TimeZone to use for generated trigger times

Throws:

IllegalArgumentException - if the pattern cannot be parsed

Method Detail

next

public Date next(Date date)

Get the next Date in the sequence matching the Cron pattern and after the value provided. The return value will have a whole number of seconds, and will be after the input value.

Parameters:

date - a seed value

Returns:

the next value matching the pattern

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object