org.apache.beam.sdk.transforms

Class Distinct.WithRepresentativeValues<T,IdT>

java.lang.Object

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

org.apache.beam.sdk.transforms.Distinct.WithRepresentativeValues<T,IdT>

Type Parameters:

T - the type of input and output element

IdT - the type of representative values used to dedup

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

Distinct<T>

public static class Distinct.WithRepresentativeValues<T,IdT>
extends PTransform<PCollection<T>,PCollection<T>>

A Distinct PTransform that uses a SerializableFunction to obtain a representative value for each input element.

Construct via Distinct.withRepresentativeValueFn(SerializableFunction).

See Also:

Serialized Form

Field Summary

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

name

Method Summary

Modifier and Type	Method and Description
PCollection<T>	expand(PCollection<T> in) Override this method to specify how this PTransform should be expanded on the given InputT.
Distinct.WithRepresentativeValues<T,IdT>	withRepresentativeType(TypeDescriptor<IdT> type) Return a WithRepresentativeValues PTransform that is like this one, but with the specified output type descriptor.

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

compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate

Methods inherited from class java.lang.Object

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

Method Detail

expand

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

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>>

withRepresentativeType

public Distinct.WithRepresentativeValues<T,IdT> withRepresentativeType(TypeDescriptor<IdT> type)

Return a WithRepresentativeValues PTransform that is like this one, but with the specified output type descriptor.

Required for use of Distinct.withRepresentativeValueFn(SerializableFunction) in Java 8 with a lambda as the fn.

Parameters:

type - a TypeDescriptor describing the representative type of this WithRepresentativeValues

Returns:

A WithRepresentativeValues PTransform that is like this one, but with the specified output type descriptor.