Package org.apache.beam.sdk.transforms.windowing

Class CalendarWindows.MonthsWindows

java.lang.Object

org.apache.beam.sdk.transforms.windowing.WindowFn<Object,IntervalWindow>

org.apache.beam.sdk.transforms.windowing.NonMergingWindowFn<Object,IntervalWindow>

org.apache.beam.sdk.transforms.windowing.PartitioningWindowFn<Object,IntervalWindow>

org.apache.beam.sdk.transforms.windowing.CalendarWindows.MonthsWindows

All Implemented Interfaces:

Serializable, HasDisplayData

Enclosing class:

CalendarWindows

public static class CalendarWindows.MonthsWindows
extends PartitioningWindowFn<Object,IntervalWindow>

A WindowFn that windows elements into periods measured by months.

By default, periods of multiple months are measured starting at the epoch. This can be overridden with withStartingMonth(int, int).

Months start on the first day of each calendar month, unless overridden by beginningOnDay(int).

The time zone used to determine calendar boundaries is UTC, unless this is overridden with the withTimeZone(org.joda.time.DateTimeZone) method.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.beam.sdk.transforms.windowing.WindowFn

WindowFn.AssignContext, WindowFn.MergeContext

Method Summary

Modifier and Type	Method	Description
IntervalWindow	assignWindow(Instant timestamp)	Returns the single window to which elements with this timestamp belong.
CalendarWindows.MonthsWindows	beginningOnDay(int dayOfMonth)
int	getDayOfMonth()
int	getNumber()
DateTime	getStartDate()
DateTimeZone	getTimeZone()
boolean	isCompatible(WindowFn<?,?> other)	Returns whether this performs the same merging as the given WindowFn.
void	populateDisplayData(DisplayData.Builder builder)	Register display data for the given transform or component.
void	verifyCompatibility(WindowFn<?,?> other)	Throw IncompatibleWindowException if this WindowFn does not perform the same merging as the given $WindowFn.
Coder<IntervalWindow>	windowCoder()	Returns the Coder used for serializing the windows used by this windowFn.
CalendarWindows.MonthsWindows	withStartingMonth(int year, int month)
CalendarWindows.MonthsWindows	withTimeZone(DateTimeZone timeZone)

Methods inherited from class org.apache.beam.sdk.transforms.windowing.PartitioningWindowFn

assignsToOneWindow, assignWindows, getDefaultWindowMappingFn

Methods inherited from class org.apache.beam.sdk.transforms.windowing.NonMergingWindowFn

isNonMerging, mergeWindows

Methods inherited from class org.apache.beam.sdk.transforms.windowing.WindowFn

getWindowTypeDescriptor

Methods inherited from class java.lang.Object

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

Method Details

beginningOnDay

public CalendarWindows.MonthsWindows beginningOnDay(int dayOfMonth)

withStartingMonth

public CalendarWindows.MonthsWindows withStartingMonth(int year,
 int month)

withTimeZone

public CalendarWindows.MonthsWindows withTimeZone(DateTimeZone timeZone)

assignWindow

public IntervalWindow assignWindow(Instant timestamp)

Description copied from class: PartitioningWindowFn

Returns the single window to which elements with this timestamp belong.

Specified by:

assignWindow in class PartitioningWindowFn<Object,IntervalWindow>

windowCoder

public Coder<IntervalWindow> windowCoder()

Description copied from class: WindowFn

Returns the Coder used for serializing the windows used by this windowFn.

Specified by:

windowCoder in class WindowFn<Object,IntervalWindow>

isCompatible

public boolean isCompatible(WindowFn<?,?> other)

Description copied from class: WindowFn

Returns whether this performs the same merging as the given WindowFn.

Specified by:

isCompatible in class WindowFn<Object,IntervalWindow>

verifyCompatibility

public void verifyCompatibility(WindowFn<?,?> other)
                         throws IncompatibleWindowException

Description copied from class: WindowFn

Throw IncompatibleWindowException if this WindowFn does not perform the same merging as the given $WindowFn.

Overrides:

verifyCompatibility in class WindowFn<Object,IntervalWindow>

Throws:

IncompatibleWindowException - if compared WindowFns are not compatible.

populateDisplayData

public void populateDisplayData(DisplayData.Builder builder)

Description copied from class: WindowFn

Register display data for the given transform or component.

populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

By default, does not register any display data. Implementors may override this method to provide their own display data.

Specified by:

populateDisplayData in interface HasDisplayData

Overrides:

populateDisplayData in class WindowFn<Object,IntervalWindow>

Parameters:

builder - The builder to populate with display data.

See Also:

• HasDisplayData

getNumber

public int getNumber()

getDayOfMonth

public int getDayOfMonth()

getStartDate

public DateTime getStartDate()

getTimeZone

public DateTimeZone getTimeZone()