CalendarWindows (core 2.44.0 API)

java.lang.Object
- org.apache.beam.sdk.transforms.windowing.CalendarWindows

```
public class CalendarWindows
extends java.lang.Object
```
A collection of WindowFns that windows values into calendar-based windows such as spans of days, months, or years.
For example, to group data into quarters that change on the 15th, use CalendarWindows.months(3).withStartingMonth(2014, 1).beginningOnDay(15).

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`CalendarWindows.DaysWindows`	A `WindowFn` that windows elements into periods measured by days.
`static class`	`CalendarWindows.MonthsWindows`	A `WindowFn` that windows elements into periods measured by months.
`static class`	`CalendarWindows.YearsWindows`	A `WindowFn` that windows elements into periods measured by years.

Constructor Summary

Constructors
Constructor Description

CalendarWindows()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static CalendarWindows.DaysWindows`	`days(int number)`	Returns a `WindowFn` that windows elements into periods measured by days.
`static CalendarWindows.MonthsWindows`	`months(int number)`	Returns a `WindowFn` that windows elements into periods measured by months.
`static CalendarWindows.DaysWindows`	`weeks(int number, int startDayOfWeek)`	Returns a `WindowFn` that windows elements into periods measured by weeks.
`static CalendarWindows.YearsWindows`	`years(int number)`	Returns a `WindowFn` that windows elements into periods measured by years.

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

- Constructor Detail
  - CalendarWindows
```
public CalendarWindows()
```
- Method Detail
  - days
```
public static CalendarWindows.DaysWindows days(int number)
```
    Returns a WindowFn that windows elements into periods measured by days.
    For example, CalendarWindows.days(1) will window elements into separate windows for each day.
  - weeks
```
public static CalendarWindows.DaysWindows weeks(int number,
                                                int startDayOfWeek)
```
    Returns a WindowFn that windows elements into periods measured by weeks.
    For example, CalendarWindows.weeks(1, DateTimeConstants.TUESDAY) will window elements into week-long windows starting on Tuesdays.
  - months
```
public static CalendarWindows.MonthsWindows months(int number)
```
    Returns a WindowFn that windows elements into periods measured by months.
    For example, CalendarWindows.months(8).withStartingMonth(2014, 1).beginningOnDay(10) will window elements into 8 month windows where that start on the 10th day of month, and the first window begins in January 2014.
  - years
```
public static CalendarWindows.YearsWindows years(int number)
```
    Returns a WindowFn that windows elements into periods measured by years.
    For example, CalendarWindows.years(1).withTimeZone(DateTimeZone.forId("America/Los_Angeles")) will window elements into year-long windows that start at midnight on Jan 1, in the America/Los_Angeles time zone.