com.google.cloud.dataflow.sdk.transforms

Class Create.Values<T>

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.PTransform<PInput,PCollection<T>>

com.google.cloud.dataflow.sdk.transforms.Create.Values<T>

All Implemented Interfaces:

HasDisplayData, Serializable

Direct Known Subclasses:

Create.TimestampedValues

Enclosing class:

Create<T>

public static class Create.Values<T>
extends PTransform<PInput,PCollection<T>>

A PTransform that creates a PCollection from a set of in-memory objects.

See Also:

Serialized Form

Field Summary

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

name

Method Summary

Modifier and Type	Method and Description
PCollection<T>	apply(PInput input) Applies this PTransform on the given InputT, and returns its Output.
Coder<T>	getDefaultOutputCoder(PInput input) Returns the default Coder to use for the output of this single-output PTransform when applied to the given input.
Iterable<T>	getElements()
Create.Values<T>	withCoder(Coder<T> coder) Returns a Create.Values PTransform like this one that uses the given Coder<T> to decode each of the objects into a value of type T.

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

getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate

Methods inherited from class java.lang.Object

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

Method Detail

withCoder

public Create.Values<T> withCoder(Coder<T> coder)

Returns a Create.Values PTransform like this one that uses the given Coder<T> to decode each of the objects into a value of type T.

By default, Create.Values can automatically determine the Coder to use if all elements have the same non-parameterized run-time class, and a default coder is registered for that class. See CoderRegistry for details on how defaults are determined.

Note that for Create.Values with no elements, the VoidCoder is used.

getElements

public Iterable<T> getElements()

apply

public PCollection<T> apply(PInput input)

Description copied from class: PTransform

Applies this PTransform on the given InputT, 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<InputT, OutputT>, InputT).

Overrides:

apply in class PTransform<PInput,PCollection<T>>

getDefaultOutputCoder

public Coder<T> getDefaultOutputCoder(PInput input)
                               throws CannotProvideCoderException

Description copied from class: PTransform

Returns the default Coder to use for the output of this single-output PTransform when applied to the given input.

Overrides:

getDefaultOutputCoder in class PTransform<PInput,PCollection<T>>

Throws:

CannotProvideCoderException - if none can be inferred.

By default, always throws.