Flatten.FlattenPCollectionList (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. After August 12, 2020, you can use unsupported SDKs temporarily while you upgrade your pipelines. For more information, see Using an unsupported SDK.

For information on migrating from the 1.x SDK, see Migrating from Dataflow SDK 1.x for Java.

Note: If you are using Cloud Dataflow SDK version 2.x, see the Apache Beam API reference documentation.

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

    All Methods Instance Methods Concrete Methods 

    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.

      By default, always throws.

      Overrides:

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

      Throws:

      CannotProvideCoderException - if none can be inferred.