org.apache.beam.sdk.values

Class PCollectionViews.MapViewFn<K,V>

java.lang.Object

org.apache.beam.sdk.transforms.ViewFn<Materializations.MultimapView<java.lang.Void,KV<K,V>>,java.util.Map<K,V>>

org.apache.beam.sdk.values.PCollectionViews.MapViewFn<K,V>

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

PCollectionViews

@Experimental(value=CORE_RUNNERS_ONLY)
public static class PCollectionViews.MapViewFn<K,V>
extends ViewFn<Materializations.MultimapView<java.lang.Void,KV<K,V>>,java.util.Map<K,V>>

Implementation which is able to adapt a multimap materialization to a Map<K, V>.

For internal use only.

Instantiate via PCollectionViews.mapView(org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<java.lang.Void, org.apache.beam.sdk.values.KV<K, V>>>, org.apache.beam.sdk.values.PCollectionViews.TypeDescriptorSupplier<K>, org.apache.beam.sdk.values.PCollectionViews.TypeDescriptorSupplier<V>, org.apache.beam.sdk.values.WindowingStrategy<?, W>).

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
MapViewFn(PCollectionViews.TypeDescriptorSupplier<K> keyTypeDescriptorSupplier, PCollectionViews.TypeDescriptorSupplier<V> valueTypeDescriptorSupplier)

Method Summary

Modifier and Type	Method and Description
java.util.Map<K,V>	apply(Materializations.MultimapView<java.lang.Void,KV<K,V>> primitiveViewT) A function to adapt a primitive view type to a desired view type.
Materialization<Materializations.MultimapView<java.lang.Void,KV<K,V>>>	getMaterialization() Gets the materialization of this ViewFn.
TypeDescriptor<java.util.Map<K,V>>	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

MapViewFn

public MapViewFn(PCollectionViews.TypeDescriptorSupplier<K> keyTypeDescriptorSupplier,
                 PCollectionViews.TypeDescriptorSupplier<V> valueTypeDescriptorSupplier)

Method Detail

getMaterialization

public Materialization<Materializations.MultimapView<java.lang.Void,KV<K,V>>> getMaterialization()

Description copied from class: ViewFn

Gets the materialization of this ViewFn.

Specified by:

getMaterialization in class ViewFn<Materializations.MultimapView<java.lang.Void,KV<K,V>>,java.util.Map<K,V>>

apply

public java.util.Map<K,V> apply(Materializations.MultimapView<java.lang.Void,KV<K,V>> 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.Void,KV<K,V>>,java.util.Map<K,V>>

getTypeDescriptor

public TypeDescriptor<java.util.Map<K,V>> 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.Void,KV<K,V>>,java.util.Map<K,V>>