org.apache.beam.sdk.values

Class PCollectionViews.ListViewFn2<T>

java.lang.Object

org.apache.beam.sdk.transforms.ViewFn<Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>>,java.util.List<T>>

org.apache.beam.sdk.values.PCollectionViews.ListViewFn2<T>

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

PCollectionViews

@Experimental(value=CORE_RUNNERS_ONLY)
public static class PCollectionViews.ListViewFn2<T>
extends ViewFn<Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>>,java.util.List<T>>

Implementation which is able to adapt a multimap materialization to a List<T>.

For internal use only.

Instantiate via PCollectionViews.listView(org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<java.lang.Long, org.apache.beam.sdk.values.PCollectionViews.ValueOrMetadata<T, org.apache.beam.sdk.io.range.OffsetRange>>>, org.apache.beam.sdk.values.PCollectionViews.TypeDescriptorSupplier<T>, org.apache.beam.sdk.values.WindowingStrategy<?, W>).

PCollectionViews.ListViewFn is meant to be removed in the future and replaced with this class.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ListViewFn2(PCollectionViews.TypeDescriptorSupplier<T> typeDescriptorSupplier)

Method Summary

Modifier and Type	Method and Description
java.util.List<T>	apply(Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>> primitiveViewT) A function to adapt a primitive view type to a desired view type.
Materialization<Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>>>	getMaterialization() Gets the materialization of this ViewFn.
TypeDescriptor<java.util.List<T>>	getTypeDescriptor() Return the TypeDescriptor describing the output of this fn.

Methods inherited from class java.lang.Object

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

Constructor Detail

ListViewFn2

public ListViewFn2(PCollectionViews.TypeDescriptorSupplier<T> typeDescriptorSupplier)

Method Detail

getMaterialization

public Materialization<Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>>> getMaterialization()

Description copied from class: ViewFn

Gets the materialization of this ViewFn.

Specified by:

getMaterialization in class ViewFn<Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>>,java.util.List<T>>

apply

public java.util.List<T> apply(Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>> primitiveViewT)

Description copied from class: ViewFn

A function to adapt a primitive view type to a desired view type.

Specified by:

apply in class ViewFn<Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>>,java.util.List<T>>

getTypeDescriptor

public TypeDescriptor<java.util.List<T>> getTypeDescriptor()

Description copied from class: ViewFn

Return the TypeDescriptor describing the output of this fn.

Specified by:

getTypeDescriptor in class ViewFn<Materializations.MultimapView<java.lang.Long,PCollectionViews.ValueOrMetadata<T,OffsetRange>>,java.util.List<T>>