org.springframework.scheduling.support

## Class CronTrigger

- java.lang.Object
- - org.springframework.scheduling.support.CronTrigger

- All Implemented Interfaces:
    Trigger

      public class CronTrigger
      extends Object
      implements Trigger

  `Trigger` implementation for cron expressions. Wraps a `CronSequenceGenerator`.
  Since:
    3.0
  Author:
    Juergen Hoeller
  See Also:
    `CronSequenceGenerator`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `CronTrigger(String cronExpression)` Build a `CronTrigger` from the pattern provided in the default time zone.
    `CronTrigger(String cronExpression, TimeZone timeZone)` Build a `CronTrigger` from the pattern provided.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `equals(Object obj)`
    `String` | `getExpression()`
    `int` | `hashCode()`
    `Date` | `nextExecutionTime(TriggerContext triggerContext)` Determine the next execution time according to the given trigger context.
    `String` | `toString()`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### CronTrigger

          public CronTrigger(String cronExpression)

      Build a `CronTrigger` from the pattern provided in the default time zone.
      Parameters:
        `cronExpression` - a space-separated list of time fields, following cron expression conventions

    - #### CronTrigger

          public CronTrigger(String cronExpression,
                     TimeZone timeZone)

      Build a `CronTrigger` from the pattern provided.
      Parameters:
        `cronExpression` - a space-separated list of time fields, following cron expression conventions
        `timeZone` - a time zone in which the trigger times will be generated

  - ### Method Detail

    - #### nextExecutionTime

          public Date nextExecutionTime(TriggerContext triggerContext)

      Determine the next execution time according to the given trigger context.

      Next execution times are calculated based on the completion time of the previous execution; therefore, overlapping executions won't occur.

      Specified by:
        `nextExecutionTime` in interface `Trigger`
      Parameters:
        `triggerContext` - context object encapsulating last execution times and last completion time
      Returns:
        the next execution time as defined by the trigger, or `null` if the trigger won't fire anymore

    - #### getExpression

          public String getExpression()

    - #### 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`