org.apache.beam.sdk.transforms

Class Create.WindowedValues<T>

java.lang.Object

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

org.apache.beam.sdk.transforms.Create.WindowedValues<T>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

Create<T>

public static class Create.WindowedValues<T>
extends PTransform<PBegin,PCollection<T>>

A PTransform that creates a PCollection whose elements have associated windowing metadata.

See Also:

Serialized Form

Field Summary

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

annotations, displayData, name, resourceHints

Method Summary

Modifier and Type	Method and Description
PCollection<T>	expand(PBegin input) Override this method to specify how this PTransform should be expanded on the given InputT.
Create.WindowedValues<T>	withCoder(Coder<T> coder) Returns a Create.WindowedValues PTransform like this one that uses the given Coder<T> to decode each of the objects into a value of type T.
Create.WindowedValues<T>	withSchema(Schema schema, TypeDescriptor<T> typeDescriptor, SerializableFunction<T,Row> toRowFunction, SerializableFunction<Row,T> fromRowFunction) Returns a Create.WindowedValues PTransform like this one that uses the given Schema to represent objects.
Create.WindowedValues<T>	withType(TypeDescriptor<T> type) Returns a Create.WindowedValues PTransform like this one that uses the given TypeDescriptor<T> to determine the Coder to use to decode each of the objects into a value of type T.
Create.WindowedValues<T>	withWindowCoder(Coder<? extends BoundedWindow> windowCoder) Returns a Create.WindowedValues 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 org.apache.beam.sdk.transforms.PTransform

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Method Detail

withCoder

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

Returns a Create.WindowedValues 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.TimestampedValues 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 with no elements, the VoidCoder is used.

withWindowCoder

public Create.WindowedValues<T> withWindowCoder(Coder<? extends BoundedWindow> windowCoder)

Returns a Create.WindowedValues 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.WindowedValues 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 with no elements, the GlobalWindow.Coder is used.

withSchema

public Create.WindowedValues<T> withSchema(Schema schema,
                                           TypeDescriptor<T> typeDescriptor,
                                           SerializableFunction<T,Row> toRowFunction,
                                           SerializableFunction<Row,T> fromRowFunction)

Returns a Create.WindowedValues PTransform like this one that uses the given Schema to represent objects.

withType

public Create.WindowedValues<T> withType(TypeDescriptor<T> type)

Returns a Create.WindowedValues PTransform like this one that uses the given TypeDescriptor<T> to determine the Coder to use to decode each of the objects into a value of type T. Note that a default coder must be registered for the class described in the TypeDescriptor<T>.

By default, Create.TimestampedValues 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.WindowedValues with no elements, the VoidCoder is used.

expand

public PCollection<T> expand(PBegin 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<PBegin,PCollection<T>>