org.apache.beam.sdk.transforms

Class ToJson<T>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<java.lang.String>>

org.apache.beam.sdk.transforms.ToJson<T>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

@Experimental
public class ToJson<T>
extends PTransform<PCollection<T>,PCollection<java.lang.String>>

Experimental

Creates a PTransform that serializes UTF-8 JSON objects from a Schema-aware PCollection (i.e. PCollection.hasSchema() returns true). JSON format is compatible with JsonToRow.

For specifics of JSON serialization see RowJson.RowJsonSerializer.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name, resourceHints

Method Summary

Modifier and Type	Method and Description
PCollection<java.lang.String>	expand(PCollection<T> rows) Override this method to specify how this PTransform should be expanded on the given InputT.
static <T> ToJson<T>	of()

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Method Detail

of

public static <T> ToJson<T> of()

expand

public PCollection<java.lang.String> expand(PCollection<T> rows)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

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).

Specified by:

expand in class PTransform<PCollection<T>,PCollection<java.lang.String>>