org.apache.beam.sdk.io.gcp.datastore

Class EntityToRow

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<com.google.datastore.v1.Entity>,PCollection<Row>>

org.apache.beam.sdk.io.gcp.datastore.EntityToRow

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

public class EntityToRow
extends PTransform<PCollection<com.google.datastore.v1.Entity>,PCollection<Row>>

A PTransform to perform a conversion of Entity to Row.

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
static EntityToRow	create(Schema schema, java.lang.String keyField) Create a PTransform instance.
PCollection<Row>	expand(PCollection<com.google.datastore.v1.Entity> input) Override this method to specify how this PTransform should be expanded on the given InputT.

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

create

public static EntityToRow create(Schema schema,
                                 java.lang.String keyField)

Create a PTransform instance.

Parameters:

schema - Schema of the target row.

keyField - A name of the row field to store the Key in.

Returns:

PTransform instance for Entity to Row conversion.

expand

public PCollection<Row> expand(PCollection<com.google.datastore.v1.Entity> input)

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<com.google.datastore.v1.Entity>,PCollection<Row>>