Spring Context 6.1.4 · org.springframework.scheduling.support.CronExpression

Modifier and Type	Field and Description
private final String	expression
private final CronField[]	fields
private static final String[]	MACROS
pack-priv static final int	MAX_ATTEMPTS

Access	Constructor and Description
private	CronExpression(CronField seconds, CronField minutes, CronField hours, CronField daysOfMonth, CronField months, CronField daysOfWeek, String expression)

Modifier and Type	Method and Description
public boolean	equals(Object the reference object with which to compare. other) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this one.
public int	hashCode() Overrides java.lang.Object.hashCode. Returns a hash code value for the object.
public static boolean	Returns: `true` if the given expression is a valid cron expression isValidExpression(String the expression to evaluate expression) Determine whether the given string represents a valid cron expression.
public < the type of temporal T extends Temporal & Comparable<? super T>> T	Returns: the next temporal that matches this expression, or `null` if no such temporal can be found next(T the seed value temporal) Calculate the next `Temporal` that matches this expression.
private <T extends Temporal & Comparable<? super T>> T	nextOrSame(T temporal)
private <T extends Temporal & Comparable<? super T>> T	nextOrSameInternal(T temporal)
public static CronExpression	Returns: the parsed `CronExpression` object parse(String the expression string to parse expression) Parse the given crontab expression string into a `CronExpression`.
private static String	resolveMacros(String expression)
public String	toString() Overrides java.lang.Object.toString. Return the expression string used to create this `CronExpression`.

expression	back to summary
private final String expression

fields	back to summary
private final CronField[] fields

MACROS	back to summary
private static final String[] MACROS

MAX_ATTEMPTS	back to summary
pack-priv static final int MAX_ATTEMPTS

CronExpression	back to summary
private CronExpression(CronField seconds, CronField minutes, CronField hours, CronField daysOfMonth, CronField months, CronField daysOfWeek, String expression)

Method Detail

equals back to summary

equals	back to summary
public boolean equals(Object other) Overrides java.lang.Object.equals. Doc from java.lang.Object.equals. Indicates whether some other object is "equal to" this one. The `equals` method implements an equivalence relation on non-null object references: It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`. It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`. It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`. It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified. For any non-null reference value `x`, `x.equals(null)` should return `false`. An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes. Parameters other:Object the reference object with which to compare. Returns:boolean `true` if this object is the same as the obj argument; `false` otherwise. Annotations @Override

public boolean equals(Object other)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

It is reflexive: for any non-null reference value x, x.equals(x) should return true.
It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters

other:Object: the reference object with which to compare.

Returns:boolean

true if this object is the same as the obj argument; false otherwise.

Annotations

@Override

hashCode back to summary

hashCode	back to summary
public int hashCode() Overrides java.lang.Object.hashCode. Doc from java.lang.Object.hashCode. Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by `java.util.HashMap`. The general contract of `hashCode` is: Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. If two objects are equal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce the same integer result. It is not required that if two objects are unequal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables. Returns:int a hash code value for this object. Annotations @Override

public int hashCode()

Overrides java.lang.Object.hashCode.

Doc from java.lang.Object.hashCode.

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

Returns:int

a hash code value for this object.

Annotations

@Override

isValidExpression back to summary

isValidExpression	back to summary
public static boolean isValidExpression(String expression) Determine whether the given string represents a valid cron expression. Parameters expression:String the expression to evaluate Returns:boolean `true` if the given expression is a valid cron expression Since 5.3.8

public static boolean isValidExpression(String expression)

Determine whether the given string represents a valid cron expression.

Parameters

expression:String: the expression to evaluate

Returns:boolean

true if the given expression is a valid cron expression

Since

5.3.8

next back to summary

next	back to summary
public <T extends Temporal & Comparable<? super T>> T next(T temporal) Calculate the next `Temporal` that matches this expression. Parameters <T> the type of temporal temporal:T the seed value Returns:T the next temporal that matches this expression, or `null` if no such temporal can be found Annotations @Nullable

public <T extends Temporal & Comparable<? super T>> T next(T temporal)

Calculate the next Temporal that matches this expression.

Parameters

<T>: the type of temporal
temporal:T: the seed value

Returns:T

the next temporal that matches this expression, or null if no such temporal can be found

Annotations

@Nullable

nextOrSame	back to summary
private <T extends Temporal & Comparable<? super T>> T nextOrSame(T temporal) Annotations @Nullable

nextOrSameInternal	back to summary
private <T extends Temporal & Comparable<? super T>> T nextOrSameInternal(T temporal) Annotations @Nullable

parse back to summary

parse	back to summary
public static CronExpression parse(String expression) Parse the given crontab expression string into a `CronExpression`. The string has six single space-separated time and date fields: ┌───────────── second (0-59) │ ┌───────────── minute (0 - 59) │ │ ┌───────────── hour (0 - 23) │ │ │ ┌───────────── day of the month (1 - 31) │ │ │ │ ┌───────────── month (1 - 12) (or JAN-DEC) │ │ │ │ │ ┌───────────── day of the week (0 - 7) │ │ │ │ │ │ (0 or 7 is Sunday, or MON-SUN) │ │ │ │ │ │ * * * * * * The following rules apply: A field may be an asterisk (``), which always stands for "first-last". For the "day of the month" or "day of the week" fields, a question mark (`?`) may be used instead of an asterisk. Ranges of numbers are expressed by two numbers separated with a hyphen (`-`). The specified range is inclusive. Following a range (or ``) with `/n` specifies the interval of the number's value through the range. English names can also be used for the "month" and "day of week" fields. Use the first three letters of the particular day or month (case does not matter). The "day of month" and "day of week" fields can contain a `L`-character, which stands for "last", and has a different meaning in each field: In the "day of month" field, `L` stands for "the last day of the month". If followed by an negative offset (i.e. `L-n`), it means "`n`th-to-last day of the month". If followed by `W` (i.e. `LW`), it means "the last weekday of the month". In the "day of week" field, `dL` or `DDDL` stands for "the last day of week `d` (or `DDD`) in the month". The "day of month" field can be `nW`, which stands for "the nearest weekday to day of the month `n`". If `n` falls on Saturday, this yields the Friday before it. If `n` falls on Sunday, this yields the Monday after, which also happens if `n` is `1` and falls on a Saturday (i.e. `1W` stands for "the first weekday of the month"). The "day of week" field can be `d#n` (or `DDD#n`), which stands for "the `n`-th day of week `d` (or `DDD`) in the month". Example expressions: `"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 6,19 * "` = 6:00 AM and 7:00 PM every day. `"0 0/30 8-10 * "` = 8:00, 8:30, 9:00, 9:30, 10:00 and 10:30 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 `"0 0 0 L * "` = last day of the month at midnight `"0 0 0 L-3 "` = third-to-last day of the month at midnight `"0 0 0 1W "` = first weekday of the month at midnight `"0 0 0 LW "` = last weekday of the month at midnight `"0 0 0 * 5L"` = last Friday of the month at midnight `"0 0 0 * * THUL"` = last Thursday of the month at midnight `"0 0 0 ? * 5#2"` = the second Friday in the month at midnight `"0 0 0 ? * MON#1"` = the first Monday in the month at midnight The following macros are also supported: `"@yearly"` (or `"@annually"`) to run un once a year, i.e. `"0 0 0 1 1 "`, `"@monthly"` to run once a month, i.e. `"0 0 0 1 "`, `"@weekly"` to run once a week, i.e. `"0 0 0 * 0"`, `"@daily"` (or `"@midnight"`) to run once a day, i.e. `"0 0 0 * * "`, `"@hourly"` to run once an hour, i.e. `"0 0 * * *"`. Parameters expression:String the expression string to parse Returns:CronExpression the parsed `CronExpression` object Exceptions IllegalArgumentException: in the expression does not conform to the cron format

public static CronExpression parse(String expression)

Parse the given crontab expression string into a CronExpression. The string has six single space-separated time and date fields:

┌───────────── second (0-59)
│ ┌───────────── minute (0 - 59)
│ │ ┌───────────── hour (0 - 23)
│ │ │ ┌───────────── day of the month (1 - 31)
│ │ │ │ ┌───────────── month (1 - 12) (or JAN-DEC)
│ │ │ │ │ ┌───────────── day of the week (0 - 7)
│ │ │ │ │ │          (0 or 7 is Sunday, or MON-SUN)
│ │ │ │ │ │
* * * * * *

The following rules apply:

A field may be an asterisk (*), which always stands for "first-last". For the "day of the month" or "day of the week" fields, a question mark (?) may be used instead of an asterisk.
Ranges of numbers are expressed by two numbers separated with a hyphen (-). The specified range is inclusive.
Following a range (or *) with /n specifies the interval of the number's value through the range.
English names can also be used for the "month" and "day of week" fields. Use the first three letters of the particular day or month (case does not matter).
The "day of month" and "day of week" fields can contain a L-character, which stands for "last", and has a different meaning in each field:
- In the "day of month" field, L stands for "the last day of the month". If followed by an negative offset (i.e. L-n), it means "nth-to-last day of the month". If followed by W (i.e. LW), it means "the last weekday of the month".
- In the "day of week" field, dL or DDDL stands for "the last day of week d (or DDD) in the month".
The "day of month" field can be nW, which stands for "the nearest weekday to day of the month n". If n falls on Saturday, this yields the Friday before it. If n falls on Sunday, this yields the Monday after, which also happens if n is 1 and falls on a Saturday (i.e. 1W stands for "the first weekday of the month").
The "day of week" field can be d#n (or DDD#n), which stands for "the n-th day of week d (or DDD) in the month".

Example expressions:

"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 6,19 * * *" = 6:00 AM and 7:00 PM every day.
"0 0/30 8-10 * * *" = 8:00, 8:30, 9:00, 9:30, 10:00 and 10:30 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
"0 0 0 L * *" = last day of the month at midnight
"0 0 0 L-3 * *" = third-to-last day of the month at midnight
"0 0 0 1W * *" = first weekday of the month at midnight
"0 0 0 LW * *" = last weekday of the month at midnight
"0 0 0 * * 5L" = last Friday of the month at midnight
"0 0 0 * * THUL" = last Thursday of the month at midnight
"0 0 0 ? * 5#2" = the second Friday in the month at midnight
"0 0 0 ? * MON#1" = the first Monday in the month at midnight

The following macros are also supported:

"@yearly" (or "@annually") to run un once a year, i.e. "0 0 0 1 1 *",
"@monthly" to run once a month, i.e. "0 0 0 1 * *",
"@weekly" to run once a week, i.e. "0 0 0 * * 0",
"@daily" (or "@midnight") to run once a day, i.e. "0 0 0 * * *",
"@hourly" to run once an hour, i.e. "0 0 * * * *".

Parameters

expression:String: the expression string to parse

Returns:CronExpression

the parsed CronExpression object

Exceptions

IllegalArgumentException:: in the expression does not conform to the cron format

resolveMacros	back to summary
private static String resolveMacros(String expression)

toString back to summary

toString	back to summary
public String toString() Overrides java.lang.Object.toString. Return the expression string used to create this `CronExpression`. Returns:String Doc from java.lang.Object.toString. a string representation of the object. Annotations @Override

public String toString()

Overrides java.lang.Object.toString.

Return the expression string used to create this CronExpression.

Returns:String

Doc from java.lang.Object.toString.

a string representation of the object.

Annotations

@Override

public final Class CronExpression

Field Summary

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Field Detail

Constructor Detail

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