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

Class Window.Assign<T>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<T>>

org.apache.beam.sdk.transforms.windowing.Window.Assign<T>

All Implemented Interfaces:

Serializable, HasDisplayData

Enclosing class:

Window<T>

public static class Window.Assign<T>
extends PTransform<PCollection<T>,PCollection<T>>

A Primitive PTransform that assigns windows to elements based on a WindowFn. Pipeline authors should use Window directly instead.

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

annotations, displayData, name, resourceHints

Method Summary

Modifier and Type	Method	Description
static <T> Window.Assign<T>	createInternal(WindowingStrategy finalStrategy)
PCollection<T>	expand(PCollection<T> input)	Override this method to specify how this PTransform should be expanded on the given InputT.
@Nullable WindowFn<T,?>	getWindowFn()
void	populateDisplayData(DisplayData.Builder builder)	Register display data for the given transform or component.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Method Details

expand

public PCollection<T> expand(PCollection<T> input)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PCollection<T>,PCollection<T>>

populateDisplayData

public void populateDisplayData(DisplayData.Builder builder)

Description copied from class: PTransform

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 PTransform<PCollection<T>,PCollection<T>>

Parameters:

builder - The builder to populate with display data.

See Also:

• HasDisplayData

getWindowFn

public @Nullable WindowFn<T,?> getWindowFn()

createInternal

public static <T> Window.Assign<T> createInternal(WindowingStrategy finalStrategy)