Package org.apache.beam.sdk.transforms

Class View.CreatePCollectionView<ElemT,ViewT>

java.lang.Object

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

org.apache.beam.sdk.transforms.View.CreatePCollectionView<ElemT,ViewT>

Type Parameters:

ElemT - The type of the elements of the input PCollection

ViewT - The type associated with the PCollectionView used as a side input

All Implemented Interfaces:

Serializable, HasDisplayData

Enclosing class:

View

@Internal
public static class View.CreatePCollectionView<ElemT,ViewT>
extends PTransform<PCollection<ElemT>,PCollection<ElemT>>

For internal use only; no backwards-compatibility guarantees.

Placeholder transform for runners to have a hook to materialize a PCollection as a side input. The metadata included in the PCollectionView is how the PCollection will be read as a side input.

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
PCollection<ElemT>	expand(PCollection<ElemT> input)	Override this method to specify how this PTransform should be expanded on the given InputT.
PCollectionView<ViewT>	getView()	Deprecated. This should not be used to obtain the output of any given application of this PTransform.
static <ElemT, ViewT> View.CreatePCollectionView<ElemT,ViewT>	of(PCollectionView<ViewT> view)

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

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

Methods inherited from class java.lang.Object

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

Method Details

of

public static <ElemT,
ViewT>
View.CreatePCollectionView<ElemT,ViewT> of(PCollectionView<ViewT> view)

getView

@Deprecated
public PCollectionView<ViewT> getView()

Deprecated.

This should not be used to obtain the output of any given application of this PTransform. That should be obtained by inspecting the TransformHierarchy.Node that contains this View.CreatePCollectionView, as this view may have been replaced within pipeline surgery.

Return the PCollectionView that is returned by applying this PTransform.

expand

public PCollection<ElemT> expand(PCollection<ElemT> 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<ElemT>,PCollection<ElemT>>