org.apache.beam.sdk.transforms

Class Create.Values<T>

java.lang.Object

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

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

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

Create<T>

public static class Create.Values<T>
extends PTransform<PBegin,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 org.apache.beam.sdk.transforms.PTransform

name

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.
java.lang.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.
Create.Values<T>	withRowSchema(Schema schema) Returns a Create.Values PTransform like this one that uses the given Schema to represent objects.
Create.Values<T>	withSchema(Schema schema, SerializableFunction<T,Row> toRowFunction, SerializableFunction<Row,T> fromRowFunction) Returns a Create.Values PTransform like this one that uses the given Schema to represent objects.
Create.Values<T>	withType(TypeDescriptor<T> type) Returns a Create.Values 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.

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

compose, getAdditionalInputs, getDefaultOutputCoder, 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.

withSchema

@Experimental(value=SCHEMAS)
public Create.Values<T> withSchema(Schema schema,
                                                                SerializableFunction<T,Row> toRowFunction,
                                                                SerializableFunction<Row,T> fromRowFunction)

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

withRowSchema

@Experimental(value=SCHEMAS)
public Create.Values<T> withRowSchema(Schema schema)

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

withType

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

Returns a Create.Values 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.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 java.lang.Iterable<T> getElements()

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>>