com.google.cloud.dataflow.sdk.transforms

Class RemoveDuplicates.WithRepresentativeValues<T,IdT>

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<T>,PCollection<T>>

com.google.cloud.dataflow.sdk.transforms.RemoveDuplicates.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:

HasDisplayData, Serializable

Enclosing class:

RemoveDuplicates<T>

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

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

Construct via RemoveDuplicates.withRepresentativeValueFn(SerializableFunction).

See Also:

Serialized Form

Field Summary

Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

name

Method Summary

Modifier and Type	Method and Description
PCollection<T>	apply(PCollection<T> in) Applies this PTransform on the given InputT, and returns its Output.
RemoveDuplicates.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 com.google.cloud.dataflow.sdk.transforms.PTransform

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

apply

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

Description copied from class: PTransform

Applies this PTransform on the given InputT, and returns its Output.

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).

The default implementation throws an exception. A derived class must either implement apply, or else each runner must supply a custom implementation via PipelineRunner.apply(com.google.cloud.dataflow.sdk.transforms.PTransform<InputT, OutputT>, InputT).

Overrides:

apply in class PTransform<PCollection<T>,PCollection<T>>

withRepresentativeType

public RemoveDuplicates.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 RemoveDuplicates.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.