java.lang.Object
- org.apache.flink.table.catalog.IntervalFreshness

```
@PublicEvolving
public class IntervalFreshness
extends Object
```
The IntervalFreshness represents freshness definition of CatalogMaterializedTable. It encapsulates the string interval value along with time unit, allowing for flexible representation of different freshness type. Moreover, it can provide detailed raw information for some specific operations.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class IntervalFreshness.TimeUnit
An enumeration of time unit representing the unit of interval freshness.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`static String`	`convertFreshnessToCron(IntervalFreshness intervalFreshness)`	Converts the freshness of materialized table to cron expression in full refresh mode.
`boolean`	`equals(Object o)`
`static IntervalFreshness`	`fromDuration(Duration duration)`	Creates an IntervalFreshness from a Duration, choosing the most appropriate time unit.
`String`	`getInterval()`	Deprecated. Use `getIntervalInt()` instead.
`int`	`getIntervalInt()`
`IntervalFreshness.TimeUnit`	`getTimeUnit()`
`int`	`hashCode()`
`static IntervalFreshness`	`of(String interval, IntervalFreshness.TimeUnit timeUnit)`
`static IntervalFreshness`	`ofDay(String interval)`
`static IntervalFreshness`	`ofHour(String interval)`
`static IntervalFreshness`	`ofMinute(String interval)`
`static IntervalFreshness`	`ofSecond(String interval)`
`Duration`	`toDuration()`
`String`	`toString()`
`static void`	`validateFreshnessForCron(IntervalFreshness intervalFreshness)`	Validates that the given freshness can be converted to a cron expression in full refresh mode.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Method Detail
  - of
```
public static IntervalFreshness of(String interval,
                                   IntervalFreshness.TimeUnit timeUnit)
```
  - ofSecond
```
public static IntervalFreshness ofSecond(String interval)
```
  - ofMinute
```
public static IntervalFreshness ofMinute(String interval)
```
  - ofHour
```
public static IntervalFreshness ofHour(String interval)
```
  - ofDay
```
public static IntervalFreshness ofDay(String interval)
```
  - validateFreshnessForCron
```
public static void validateFreshnessForCron(IntervalFreshness intervalFreshness)
```
    Validates that the given freshness can be converted to a cron expression in full refresh mode. Since freshness and cron expression cannot be converted equivalently, there are currently only a limited patterns of freshness that are supported.
    
    Parameters:
    
    intervalFreshness - the freshness to validate
    
    Throws:
    
    ValidationException - if the freshness cannot be converted to a valid cron expression
  - convertFreshnessToCron
```
public static String convertFreshnessToCron(IntervalFreshness intervalFreshness)
```
    Converts the freshness of materialized table to cron expression in full refresh mode. The freshness must first pass validation via validateFreshnessForCron(org.apache.flink.table.catalog.IntervalFreshness).
    
    Parameters:
    
    intervalFreshness - the freshness to convert
    
    Returns:
    
    the corresponding cron expression
    
    Throws:
    
    ValidationException - if the freshness cannot be converted to a valid cron expression
  - fromDuration
```
public static IntervalFreshness fromDuration(Duration duration)
```
    Creates an IntervalFreshness from a Duration, choosing the most appropriate time unit. Prefers larger units when possible (e.g., 60 seconds → 1 minute).
  - getInterval
```
@Deprecated
public String getInterval()
```
    Deprecated.
    Use getIntervalInt() instead.
  - getIntervalInt
```
public int getIntervalInt()
```
  - getTimeUnit
```
public IntervalFreshness.TimeUnit getTimeUnit()
```
  - toDuration
```
public Duration toDuration()
```
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object

Class IntervalFreshness

Nested Class Summary

Method Summary

Methods inherited from class java.lang.Object

Method Detail

of

ofSecond

ofMinute

ofHour

ofDay

validateFreshnessForCron

convertFreshnessToCron

fromDuration

getInterval

getIntervalInt

getTimeUnit

toDuration

equals

toString

hashCode