CoderProviders (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.coders

Class CoderProviders

• java.lang.Object
• • com.google.cloud.dataflow.sdk.coders.CoderProviders

• ---

  
  

  public final class CoderProviders
  extends Object

  Static utility methods for working with CoderProviders.

• • Method Summary

    All Methods Static Methods Concrete Methods 

    Modifier and Type	Method and Description
    static CoderProvider	firstOf(CoderProvider... coderProviders) Returns a CoderProvider that consults each of the provider coderProviders and returns the first Coder provided.
    static <T> CoderProvider	fromStaticMethods(Class<T> clazz) Creates a CoderProvider built from particular static methods of a class that implements Coder.

    • Methods inherited from class java.lang.Object

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

• • Method Detail

    • fromStaticMethods

      public static <T> CoderProvider fromStaticMethods(Class<T> clazz)

      Creates a CoderProvider built from particular static methods of a class that implements Coder. The requirements for this method are precisely the requirements for a Coder class to be usable with DefaultCoder annotations.

      The class must have the following static method:

      
       public static Coder<T> of(TypeDescriptor<T> type)
       
       

    • firstOf

      public static CoderProvider firstOf(CoderProvider... coderProviders)

      Returns a CoderProvider that consults each of the provider coderProviders and returns the first Coder provided.

      Note that the order in which the providers are listed matters: While the set of types handled will be the union of those handled by all of the providers in the list, the actual Coder provided by the first successful provider may differ, and may have inferior properties. For example, not all Coders are deterministic, handle null values, or have comparable performance.