Package org.apache.beam.sdk.values

Class PCollectionViews.SingletonViewFn<T>

java.lang.Object

org.apache.beam.sdk.transforms.ViewFn<Materializations.MultimapView<Void,T>,T>

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

All Implemented Interfaces:

Serializable, PCollectionViews.HasDefaultValue<T>, PCollectionViews.IsSingletonView<T>

Enclosing class:

PCollectionViews

@Deprecated
public static class PCollectionViews.SingletonViewFn<T>
extends ViewFn<Materializations.MultimapView<Void,T>,T>
implements PCollectionViews.HasDefaultValue<T>, PCollectionViews.IsSingletonView<T>

Deprecated.

See PCollectionViews.SingletonViewFn2.

Implementation which is able to adapt a multimap materialization to a T.

For internal use only.

See Also:

• Serialized Form

Method Summary

Modifier and Type	Method	Description
T	apply(Materializations.MultimapView<Void,T> primitiveViewT)	Deprecated. A function to adapt a primitive view type to a desired view type.
T	getDefaultValue()	Deprecated. Returns the default value that was specified.
Materialization<Materializations.MultimapView<Void,T>>	getMaterialization()	Deprecated. Gets the materialization of this ViewFn.
TypeDescriptor<T>	getTypeDescriptor()	Deprecated. Return the TypeDescriptor describing the output of this fn.
boolean	hasDefault()	Deprecated. Returns if a default value was specified.

Methods inherited from class java.lang.Object

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

Method Details

hasDefault

public boolean hasDefault()

Deprecated.

Returns if a default value was specified.

getDefaultValue

public T getDefaultValue()

Deprecated.

Returns the default value that was specified.

For internal use only.

Specified by:

getDefaultValue in interface PCollectionViews.HasDefaultValue<T>

Throws:

NoSuchElementException - if no default was specified.

getMaterialization

public Materialization<Materializations.MultimapView<Void,T>> getMaterialization()

Deprecated.

Description copied from class: ViewFn

Gets the materialization of this ViewFn.

Specified by:

getMaterialization in class ViewFn<Materializations.MultimapView<Void,T>,T>

apply

public T apply(Materializations.MultimapView<Void,T> primitiveViewT)

Deprecated.

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<Void,T>,T>

getTypeDescriptor

public TypeDescriptor<T> getTypeDescriptor()

Deprecated.

Description copied from class: ViewFn

Return the TypeDescriptor describing the output of this fn.

Specified by:

getTypeDescriptor in class ViewFn<Materializations.MultimapView<Void,T>,T>