PValueBase (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. See Migrating from 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.values

Class PValueBase

• java.lang.Object
• • com.google.cloud.dataflow.sdk.values.POutputValueBase
  • • com.google.cloud.dataflow.sdk.values.PValueBase

• All Implemented Interfaces:

  PInput, POutput, PValue

  Direct Known Subclasses:

  TypedPValue

  ---

  
  

  public abstract class PValueBase
  extends POutputValueBase
  implements PValue

  A PValueBase is an abstract base class that provides sensible default implementations for methods of PValue. In particular, this includes functionality for getting/setting:

  • The Pipeline that the PValue is part of.
  • Whether the PValue has bee finalized (as an input or an output), after which its properties can no longer be changed.

  For internal use.

• • Constructor Summary

    Constructors 

    Modifier	Constructor and Description
    protected	PValueBase() No-arg constructor for Java serialization only.
    protected	PValueBase(Pipeline pipeline)

  • Method Summary

    All Methods Instance Methods Concrete Methods 

    Modifier and Type	Method and Description
    Collection<? extends PValue>	expand() Expands this POutput into a list of its component output PValues.
    void	finishSpecifying() After building, finalizes this PInput to make it ready for being used as an input to a PTransform.
    protected String	getKindString() Returns a String capturing the kind of this PValueBase.
    String	getName() Returns the name of this PValueBase.
    boolean	isFinishedSpecifyingInternal() Returns whether this PValueBase has been finalized, and its core properties, e.g., name, can no longer be changed.
    void	recordAsOutput(AppliedPTransform<?,?,?> transform) Records that this POutputValueBase is an output with the given name of the given AppliedPTransform.
    protected void	recordAsOutput(AppliedPTransform<?,?,?> transform, String outName) Records that this POutputValueBase is an output with the given name of the given AppliedPTransform in the given Pipeline.
    PValueBase	setName(String name) Sets the name of this PValueBase.
    String	toString()

    • Methods inherited from class com.google.cloud.dataflow.sdk.values.POutputValueBase

      finishSpecifyingOutput, getPipeline, getProducingTransformInternal

    • Methods inherited from class java.lang.Object

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

    • Methods inherited from interface com.google.cloud.dataflow.sdk.values.PValue

      getProducingTransformInternal

    • Methods inherited from interface com.google.cloud.dataflow.sdk.values.POutput

      finishSpecifyingOutput, getPipeline

    • Methods inherited from interface com.google.cloud.dataflow.sdk.values.PInput

      getPipeline

• • Constructor Detail

    • PValueBase

      protected PValueBase(Pipeline pipeline)

    • PValueBase

      protected PValueBase()

      No-arg constructor for Java serialization only. The resulting PValueBase is unlikely to be valid.

  • Method Detail

    • getName

      public String getName()

      Returns the name of this PValueBase.

      By default, the name of a PValueBase is based on the name of the PTransform that produces it. It can be specified explicitly by calling setName(java.lang.String).

      Specified by:

      getName in interface PValue

      Throws:

      IllegalStateException - if the name hasn't been set yet

    • setName

      public PValueBase setName(String name)

      Sets the name of this PValueBase. Returns this.

      Throws:

      IllegalStateException - if this PValueBase has already been finalized and may no longer be set.

    • recordAsOutput

      public void recordAsOutput(AppliedPTransform<?,?,?> transform)

      Description copied from class: POutputValueBase
      Records that this POutputValueBase is an output with the given name of the given AppliedPTransform.

      To be invoked only by POutput.recordAsOutput(com.google.cloud.dataflow.sdk.transforms.AppliedPTransform<?, ?, ?>) implementations. Not to be invoked directly by user code.

      Specified by:

      recordAsOutput in interface POutput

      Overrides:

      recordAsOutput in class POutputValueBase

    • recordAsOutput

      protected void recordAsOutput(AppliedPTransform<?,?,?> transform,
                                    String outName)

      Records that this POutputValueBase is an output with the given name of the given AppliedPTransform in the given Pipeline.

      To be invoked only by POutput.recordAsOutput(com.google.cloud.dataflow.sdk.transforms.AppliedPTransform<?, ?, ?>) implementations. Not to be invoked directly by user code.

    • isFinishedSpecifyingInternal

      public boolean isFinishedSpecifyingInternal()

      Returns whether this PValueBase has been finalized, and its core properties, e.g., name, can no longer be changed.

      For internal use only.

    • expand

      public Collection<? extends PValue> expand()

      Description copied from interface: POutput
      Expands this POutput into a list of its component output PValues.

      • A PValue expands to itself.
      • A tuple or list of PValues (such as PCollectionTuple or PCollectionList) expands to its component PValue PValues.

      Not intended to be invoked directly by user code.

      Specified by:

      expand in interface PInput

      Specified by:

      expand in interface POutput

    • finishSpecifying

      public void finishSpecifying()

      Description copied from interface: PInput
      After building, finalizes this PInput to make it ready for being used as an input to a PTransform.

      Automatically invoked whenever apply() is invoked on this PInput, so users do not normally call this explicitly.

      Specified by:

      finishSpecifying in interface PInput

    • toString

      public String toString()

      Overrides:

      toString in class Object

    • getKindString

      protected String getKindString()

      Returns a String capturing the kind of this PValueBase.

      By default, uses the base name of the current class as its kind string.