ParDo.Bound (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Cloud Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. See Migrating from Cloud Dataflow SDK 1.x for Java for migration guidance.

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 ParDo.Bound<InputT,OutputT>

• java.lang.Object
• • com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<? extends InputT>,PCollection<OutputT>>
  • • com.google.cloud.dataflow.sdk.transforms.ParDo.Bound<InputT,OutputT>

• Type Parameters:

  InputT - the type of the (main) input PCollection elements

  OutputT - the type of the (main) output PCollection elements

  All Implemented Interfaces:

  HasDisplayData, Serializable

  Enclosing class:

  ParDo

  ---

  
  

  public static class ParDo.Bound<InputT,OutputT>
  extends PTransform<PCollection<? extends InputT>,PCollection<OutputT>>

  A PTransform that, when applied to a PCollection<InputT>, invokes a user-specified DoFn<InputT, OutputT> on all its elements, with all its outputs collected into an output PCollection<OutputT>.

  A multi-output form of this transform can be created with withOutputTags(com.google.cloud.dataflow.sdk.values.TupleTag<OutputT>, com.google.cloud.dataflow.sdk.values.TupleTagList).

  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<OutputT>	apply(PCollection<? extends InputT> input) Applies this PTransform on the given InputT, and returns its Output.
    protected Coder<OutputT>	getDefaultOutputCoder(PCollection<? extends InputT> input) Returns the default Coder to use for the output of this single-output PTransform when applied to the given input.
    DoFn<InputT,OutputT>	getFn()
    protected String	getKindString() Returns the name to use by default for this PTransform (not including the names of any enclosing PTransforms).
    List<PCollectionView<?>>	getSideInputs()
    ParDo.Bound<InputT,OutputT>	named(String name) Returns a new ParDo PTransform that's like this PTransform but with the specified name.
    void	populateDisplayData(DisplayData.Builder builder) Register display data for the given transform or component.
    ParDo.BoundMulti<InputT,OutputT>	withOutputTags(TupleTag<OutputT> mainOutputTag, TupleTagList sideOutputTags) Returns a new multi-output ParDo PTransform that's like this PTransform but with the specified main and side output tags.
    ParDo.Bound<InputT,OutputT>	withSideInputs(Iterable<? extends PCollectionView<?>> sideInputs) Returns a new ParDo PTransform that's like this PTransform but with the specified additional side inputs.
    ParDo.Bound<InputT,OutputT>	withSideInputs(PCollectionView<?>... sideInputs) Returns a new ParDo PTransform that's like this PTransform but with the specified additional side inputs.

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

      getDefaultOutputCoder, getDefaultOutputCoder, getName, toString, validate

    • Methods inherited from class java.lang.Object

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

• • Method Detail

    • named

      public ParDo.Bound<InputT,OutputT> named(String name)

      Returns a new ParDo PTransform that's like this PTransform but with the specified name. Does not modify this PTransform.

      See the discussion of Naming above for more explanation.

    • withSideInputs

      public ParDo.Bound<InputT,OutputT> withSideInputs(PCollectionView<?>... sideInputs)

      Returns a new ParDo PTransform that's like this PTransform but with the specified additional side inputs. Does not modify this PTransform.

      See the discussion of Side Inputs above and on ParDo.withSideInputs(com.google.cloud.dataflow.sdk.values.PCollectionView<?>...) for more explanation.

    • withSideInputs

      public ParDo.Bound<InputT,OutputT> withSideInputs(Iterable<? extends PCollectionView<?>> sideInputs)

      Returns a new ParDo PTransform that's like this PTransform but with the specified additional side inputs. Does not modify this PTransform.

      See the discussion of Side Inputs above and on ParDo.withSideInputs(com.google.cloud.dataflow.sdk.values.PCollectionView<?>...) for more explanation.

    • withOutputTags

      public ParDo.BoundMulti<InputT,OutputT> withOutputTags(TupleTag<OutputT> mainOutputTag,
                                                             TupleTagList sideOutputTags)

      Returns a new multi-output ParDo PTransform that's like this PTransform but with the specified main and side output tags. Does not modify this PTransform.

      See the discussion of Side Outputs above and on ParDo.withOutputTags(com.google.cloud.dataflow.sdk.values.TupleTag<OutputT>, com.google.cloud.dataflow.sdk.values.TupleTagList) for more explanation.

    • apply

      public PCollection<OutputT> apply(PCollection<? extends InputT> input)

      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<? extends InputT>,PCollection<OutputT>>

    • getDefaultOutputCoder

      protected Coder<OutputT> getDefaultOutputCoder(PCollection<? extends InputT> 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<PCollection<? extends InputT>,PCollection<OutputT>>

      Throws:

      CannotProvideCoderException - if none can be inferred.

    • getKindString

      protected String getKindString()

      Description copied from class: PTransform
      Returns the name to use by default for this PTransform (not including the names of any enclosing PTransforms).

      By default, returns the base name of this PTransform's class.

      The caller is responsible for ensuring that names of applied PTransforms are unique, e.g., by adding a uniquifying suffix when needed.

      Overrides:

      getKindString in class PTransform<PCollection<? extends InputT>,PCollection<OutputT>>

    • populateDisplayData

      public void populateDisplayData(DisplayData.Builder builder)

      Register display data for the given transform or component.

      populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

      By default, does not register any display data. Implementors may override this method to provide their own display data.

      ParDo registers its internal DoFn as a subcomponent for display data. DoFn implementations can register display data by overriding DoFn.populateDisplayData(com.google.cloud.dataflow.sdk.transforms.display.DisplayData.Builder).

      Specified by:

      populateDisplayData in interface HasDisplayData

      Overrides:

      populateDisplayData in class PTransform<PCollection<? extends InputT>,PCollection<OutputT>>

      Parameters:

      builder - The builder to populate with display data.

      See Also:

      HasDisplayData

    • getFn

      public DoFn<InputT,OutputT> getFn()

    • getSideInputs

      public List<PCollectionView<?>> getSideInputs()