org.apache.beam.sdk.io

Class Read.Bounded<T>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PBegin,PCollection<T>>

org.apache.beam.sdk.io.Read.Bounded<T>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

Read

public static class Read.Bounded<T>
extends PTransform<PBegin,PCollection<T>>

PTransform that reads from a BoundedSource.

See Also:

Serialized Form

Field Summary

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

name

Method Summary

Modifier and Type	Method and Description
PCollection<T>	expand(PBegin input) Applies this PTransform on the given InputT, and returns its Output.
protected Coder<T>	getDefaultOutputCoder() Returns the default Coder to use for the output of this single-output PTransform.
java.lang.String	getKindString() Returns the name to use by default for this PTransform (not including the names of any enclosing PTransforms).
BoundedSource<T>	getSource() Returns the BoundedSource used to create this Read PTransform.
void	populateDisplayData(DisplayData.Builder builder) Register display data for the given transform or component.

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

getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getName, toString, validate

Methods inherited from class java.lang.Object

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

Method Detail

getDefaultOutputCoder

protected Coder<T> getDefaultOutputCoder()

Description copied from class: PTransform

Returns the default Coder to use for the output of this single-output PTransform.

By default, always throws

Overrides:

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

expand

public final PCollection<T> expand(PBegin 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).

Specified by:

expand in class PTransform<PBegin,PCollection<T>>

getSource

public BoundedSource<T> getSource()

Returns the BoundedSource used to create this Read PTransform.

getKindString

public java.lang.String getKindString()

Description copied from class: PTransform

Returns the name to use by default for this PTransform (not including the names of any enclosing PTransforms).

By default, returns the base name of this PTransform's class.

The caller is responsible for ensuring that names of applied PTransforms are unique, e.g., by adding a uniquifying suffix when needed.

Overrides:

getKindString in class PTransform<PBegin,PCollection<T>>

populateDisplayData

public void populateDisplayData(DisplayData.Builder builder)

Description copied from class: PTransform

Register display data for the given transform or component.

populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

By default, does not register any display data. Implementors may override this method to provide their own display data.

Specified by:

populateDisplayData in interface HasDisplayData

Overrides:

populateDisplayData in class PTransform<PBegin,PCollection<T>>

Parameters:

builder - The builder to populate with display data.

See Also:

HasDisplayData