com.google.cloud.dataflow.sdk.transforms

Class Flatten.FlattenPCollectionList<T>

java.lang.Object

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

com.google.cloud.dataflow.sdk.transforms.Flatten.FlattenPCollectionList<T>

Type Parameters:

T - the type of the elements in the input and output PCollections.

All Implemented Interfaces:

HasDisplayData, Serializable

Enclosing class:

Flatten

public static class Flatten.FlattenPCollectionList<T>
extends PTransform<PCollectionList<T>,PCollection<T>>

A PTransform that flattens a PCollectionList into a PCollection containing all the elements of all the PCollections in its input. Implements Flatten.pCollections().

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(PCollectionList<T> inputs) Applies this PTransform on the given InputT, and returns its Output.
protected Coder<?>	getDefaultOutputCoder(PCollectionList<T> input) Returns the default Coder to use for the output of this single-output PTransform when applied to the given input.

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

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(PCollectionList<T> inputs)

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<PCollectionList<T>,PCollection<T>>

getDefaultOutputCoder

protected Coder<?> getDefaultOutputCoder(PCollectionList<T> input)
                                  throws CannotProvideCoderException

Description copied from class: PTransform

Returns the default Coder to use for the output of this single-output PTransform when applied to the given input.

Overrides:

getDefaultOutputCoder in class PTransform<PCollectionList<T>,PCollection<T>>

Throws:

CannotProvideCoderException - if none can be inferred.

By default, always throws.