com.google.cloud.dataflow.sdk.io

Class DatastoreIO.Read.Bound

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.PTransform<PBegin,PCollection<com.google.api.services.datastore.DatastoreV1.Entity>>

com.google.cloud.dataflow.sdk.io.DatastoreIO.Read.Bound

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

DatastoreIO.Read

public static class DatastoreIO.Read.Bound
extends PTransform<PBegin,PCollection<com.google.api.services.datastore.DatastoreV1.Entity>>

A PTransform that reads from a Datastore query and returns a bounded PCollection<Entity>.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

name

Method Summary

Methods

Modifier and Type	Method and Description
PCollection<com.google.api.services.datastore.DatastoreV1.Entity>	apply(PBegin input) Applies this PTransform on the given Input, and returns its Output.
DatastoreIO.Read.Bound	from(java.lang.String datasetId, com.google.api.services.datastore.DatastoreV1.Query query) Returns a new DatastoreIO.Read PTransform with datasetId, and query associated with this transformation, and options associated with this Pipleine.
DatastoreIO.Read.Bound	named(java.lang.String name) Returns a new DatastoreIO.Read PTransform with the name associated with this transformation.
DatastoreIO.Read.Bound	withHost(java.lang.String host) Returns a new DatastoreIO.Read PTransform with the host specified.

Methods inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

finishSpecifying, getCoderRegistry, getDefaultName, getDefaultOutputCoder, getDefaultOutputCoder, getInput, getKindString, getName, getOutput, getPipeline, setName, setPipeline, toString, withName

Methods inherited from class java.lang.Object

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

Method Detail

named

public DatastoreIO.Read.Bound named(java.lang.String name)

Returns a new DatastoreIO.Read PTransform with the name associated with this transformation.

from

public DatastoreIO.Read.Bound from(java.lang.String datasetId,
                          com.google.api.services.datastore.DatastoreV1.Query query)

Returns a new DatastoreIO.Read PTransform with datasetId, and query associated with this transformation, and options associated with this Pipleine.

withHost

public DatastoreIO.Read.Bound withHost(java.lang.String host)

Returns a new DatastoreIO.Read PTransform with the host specified.

apply

public PCollection<com.google.api.services.datastore.DatastoreV1.Entity> apply(PBegin input)

Description copied from class: PTransform

Applies this PTransform on the given Input, and returns its Output.

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).

The default implementation throws an exception. A derived class must either implement apply, or else each runner must supply a custom implementation via PipelineRunner.apply(com.google.cloud.dataflow.sdk.transforms.PTransform<Input, Output>, Input).

Overrides:

apply in class PTransform<PBegin,PCollection<com.google.api.services.datastore.DatastoreV1.Entity>>