com.google.cloud.dataflow.sdk.values

Interface PInput

All Known Subinterfaces:

PCollectionView<T,WT>, PValue

All Known Implementing Classes:

KeyedPCollectionTuple, PBegin, PCollection, PCollectionList, PCollectionTuple, PValueBase, TypedPValue

public interface PInput

The abstract interface of things that might be input to a PTransform.

Method Summary

Methods

Modifier and Type	Method and Description
java.util.Collection<? extends PValue>	expand() Expands this PInput into a list of its component input PValues.
void	finishSpecifying() After building, finalizes this PInput to make it ready for being used as an input to a PTransform.
Pipeline	getPipeline() Returns the owning Pipeline of this PInput.

Method Detail

getPipeline

Pipeline getPipeline()

Returns the owning Pipeline of this PInput.

Throws:

java.lang.IllegalStateException - if the owning Pipeline hasn't been set yet

expand

java.util.Collection<? extends PValue> expand()

Expands this PInput into a list of its component input PValues.

A PValue expands to itself.

A tuple or list of PValues (e.g., PCollectionTuple, and PCollectionList) expands to its component PValues.

Not intended to be invoked directly by user code.

finishSpecifying

void finishSpecifying()

After building, finalizes this PInput to make it ready for being used as an input to a PTransform.

Automatically invoked whenever apply() is invoked on this PInput, so users do not normally call this explicitly.