TypedPValue (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 TypedPValue<T>

• java.lang.Object
• • com.google.cloud.dataflow.sdk.values.POutputValueBase
  • • com.google.cloud.dataflow.sdk.values.PValueBase
    • • com.google.cloud.dataflow.sdk.values.TypedPValue<T>

• Type Parameters:

  T - the type of the values stored in this TypedPValue

  All Implemented Interfaces:

  PInput, POutput, PValue

  Direct Known Subclasses:

  PCollection

  ---

  
  

  public abstract class TypedPValue<T>
  extends PValueBase
  implements PValue

  A TypedPValue<T> is the abstract base class of things that store some number of values of type T.

  Because we know the type T, this is the layer of the inheritance hierarchy where we store a coder for objects of type T.

• • Constructor Summary

    Constructors 

    Modifier	Constructor and Description
    protected	TypedPValue(Pipeline p)

  • Method Summary

    All Methods Instance Methods Concrete Methods 

    Modifier and Type	Method and Description
    void	finishSpecifying() After building, finalizes this PValue to make it ready for running.
    Coder<T>	getCoder() Returns the Coder used by this TypedPValue to encode and decode the values stored in it.
    TypeDescriptor<T>	getTypeDescriptor() Returns a TypeDescriptor<T> with some reflective information about T, if possible.
    TypedPValue<T>	setCoder(Coder<T> coder) Sets the Coder used by this TypedPValue to encode and decode the values stored in it.
    TypedPValue<T>	setTypeDescriptorInternal(TypeDescriptor<T> typeDescriptor) Sets the TypeDescriptor<T> associated with this class.

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

      expand, getKindString, getName, isFinishedSpecifyingInternal, recordAsOutput, recordAsOutput, setName, 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

      getName, getProducingTransformInternal

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

      expand, finishSpecifyingOutput, getPipeline, recordAsOutput

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

      expand, getPipeline

• • Constructor Detail

    • TypedPValue

      protected TypedPValue(Pipeline p)

  • Method Detail

    • getCoder

      public Coder<T> getCoder()

      Returns the Coder used by this TypedPValue to encode and decode the values stored in it.

      Throws:

      IllegalStateException - if the Coder hasn't been set, and couldn't be inferred.

    • setCoder

      public TypedPValue<T> setCoder(Coder<T> coder)

      Sets the Coder used by this TypedPValue to encode and decode the values stored in it. Returns this.

      Throws:

      IllegalStateException - if this TypedPValue has already been finalized and is no longer settable, e.g., by having apply() called on it

    • finishSpecifying

      public void finishSpecifying()

      After building, finalizes this PValue to make it ready for running. Automatically invoked whenever the PValue is "used" (e.g., when apply() is called on it) and when the Pipeline is run (useful if this is a PValue with no consumers).

      Specified by:

      finishSpecifying in interface PInput

      Overrides:

      finishSpecifying in class PValueBase

    • getTypeDescriptor

      public TypeDescriptor<T> getTypeDescriptor()

      Returns a TypeDescriptor<T> with some reflective information about T, if possible. May return null if no information is available. Subclasses may override this to enable better Coder inference.

    • setTypeDescriptorInternal

      public TypedPValue<T> setTypeDescriptorInternal(TypeDescriptor<T> typeDescriptor)

      Sets the TypeDescriptor<T> associated with this class. Better reflective type information will lead to better Coder inference.