Package org.apache.beam.sdk.coders

Annotation Interface DefaultCoder

@Documented
@Retention(RUNTIME)
@Target(TYPE)
public @interface DefaultCoder

The DefaultCoder annotation specifies a Coder class to handle encoding and decoding instances of the annotated class.

The specified Coder must have the following method:

 public static CoderProvider getCoderProvider().
 

Coders specified explicitly via PCollection.setCoder(org.apache.beam.sdk.coders.Coder<T>) take precedence, followed by Coders found at runtime via CoderRegistry.getCoder(java.lang.Class<T>). See CoderRegistry for a more detailed discussion of the precedence rules.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DefaultCoder.DefaultCoderProviderRegistrar	A CoderProviderRegistrar that registers a CoderProvider which can use the @DefaultCoder annotation to provide coder providers that creates Coders.

Required Element Summary

Required Elements

Modifier and Type	Required Element	Description
Class<? extends Coder>	value

Element Details

value

@CheckForNull
Class<? extends Coder> value