org.apache.beam.runners.direct

Class ForwardingPTransform<InputT extends PInput,OutputT extends POutput>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<InputT,OutputT>

org.apache.beam.runners.direct.ForwardingPTransform<InputT,OutputT>

All Implemented Interfaces:

Serializable, HasDisplayData

public abstract class ForwardingPTransform<InputT extends PInput,OutputT extends POutput>
extends PTransform<InputT,OutputT>

A base class for implementing PTransform overrides, which behave identically to the delegate transform but with overridden methods. Implementors are required to implement delegate(), which returns the object to forward calls to, and expand(PInput).

See Also:

Serialized Form

Field Summary

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

name

Constructor Summary

Constructors

Constructor and Description
ForwardingPTransform()

Method Summary

Modifier and Type	Method and Description
protected abstract PTransform<InputT,OutputT>	delegate()
OutputT	expand(InputT input)
<T> Coder<T>	getDefaultOutputCoder(InputT input, TypedPValue<T> output)
String	getName()
void	populateDisplayData(DisplayData.Builder builder)
void	validate(InputT input)

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

getDefaultOutputCoder, getDefaultOutputCoder, getKindString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ForwardingPTransform

public ForwardingPTransform()

Method Detail

delegate

protected abstract PTransform<InputT,OutputT> delegate()

expand

public OutputT expand(InputT input)

Specified by:

expand in class PTransform<InputT extends PInput,OutputT extends POutput>

validate

public void validate(InputT input)

Overrides:

validate in class PTransform<InputT extends PInput,OutputT extends POutput>

getName

public String getName()

Overrides:

getName in class PTransform<InputT extends PInput,OutputT extends POutput>

getDefaultOutputCoder

public <T> Coder<T> getDefaultOutputCoder(InputT input,
                                          TypedPValue<T> output)
                                   throws CannotProvideCoderException

Overrides:

getDefaultOutputCoder in class PTransform<InputT extends PInput,OutputT extends POutput>

Throws:

CannotProvideCoderException

populateDisplayData

public void populateDisplayData(DisplayData.Builder builder)

Specified by:

populateDisplayData in interface HasDisplayData

Overrides:

populateDisplayData in class PTransform<InputT extends PInput,OutputT extends POutput>