hudson.scheduler
Class CronTab

java.lang.Object
  hudson.scheduler.CronTab

public final class CronTab
extends Object

Table for driving scheduled tasks.

Author:

Kohsuke Kawaguchi

Constructor Summary

CronTab(String format)

CronTab(String format, Hash hash)

CronTab(String format, int line)
Deprecated. as of 1.448 Use CronTab(String, int, Hash)

CronTab(String format, int line, Hash hash)

Method Summary

Calendar	ceil(Calendar cal) See ceil(long).
Calendar	ceil(long t) Computes the nearest future timestamp that matches this cron tab.
String	checkSanity() Checks if this crontab entry looks reasonable, and if not, return an warning message.
Calendar	floor(Calendar cal) See floor(long) This method modifies the given calendar and returns the same object.
Calendar	floor(long t) Computes the nearest past timestamp that matched this cron tab.
static String	hashify(String spec) Checks a prospective crontab specification to see if it could benefit from balanced hashes.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

CronTab

public CronTab(String format)
        throws antlr.ANTLRException

Throws:

antlr.ANTLRException

CronTab

public CronTab(String format,
               Hash hash)
        throws antlr.ANTLRException

Throws:

antlr.ANTLRException

CronTab

public CronTab(String format,
               int line)
        throws antlr.ANTLRException

Deprecated. as of 1.448 Use CronTab(String, int, Hash)

Throws:

antlr.ANTLRException

CronTab

public CronTab(String format,
               int line,
               Hash hash)
        throws antlr.ANTLRException

Parameters:

hash - Used to spread out token like "@daily". Null to preserve the legacy behaviour of not spreading it out at all.

Throws:

antlr.ANTLRException

Method Detail

ceil

public Calendar ceil(long t)

Computes the nearest future timestamp that matches this cron tab.

More precisely, given the time 't', computes another smallest time x such that:

• x >= t (inclusive)
• x matches this crontab

Note that if t already matches this cron, it's returned as is.

ceil

public Calendar ceil(Calendar cal)

See ceil(long). This method modifies the given calendar and returns the same object.

floor

public Calendar floor(long t)

Computes the nearest past timestamp that matched this cron tab.

More precisely, given the time 't', computes another smallest time x such that:

• x <= t (inclusive)
• x matches this crontab

Note that if t already matches this cron, it's returned as is.

floor

public Calendar floor(Calendar cal)

See floor(long) This method modifies the given calendar and returns the same object.

toString

public String toString()

Overrides:

toString in class Object

checkSanity

@CheckForNull
public String checkSanity()

Checks if this crontab entry looks reasonable, and if not, return an warning message.

The point of this method is to catch syntactically correct but semantically suspicious combinations, like "* 0 * * *"

hashify

@CheckForNull
public static String hashify(String spec)

Checks a prospective crontab specification to see if it could benefit from balanced hashes.

Parameters:

spec - a (legal) spec

Returns:

a similar spec that uses a hash, if such a transformation is necessary; null if it is OK as is

Since:

1.509