Package org.apache.beam.sdk.runners

Class TransformHierarchy.Node

java.lang.Object

org.apache.beam.sdk.runners.TransformHierarchy.Node

Enclosing class:

TransformHierarchy

public class TransformHierarchy.Node
extends java.lang.Object

Provides internal tracking of transform relationships with helper methods for initialization and ordered visitation.

Method Summary

Modifier and Type	Method	Description
void	addComposite(TransformHierarchy.Node node)	Adds a composite operation to the transform node.
TransformHierarchy.Node	getEnclosingNode()	Returns the enclosing composite transform node, or null if there is none.
java.lang.String	getFullName()
java.util.Map<TupleTag<?>,PCollection<?>>	getInputs()	Returns the transform input, in fully expanded form.
java.util.Map<TupleTag<?>,PCollection<?>>	getOutputs()	Returns the transform output, in expanded form.
@Nullable PTransform<?,?>	getTransform()	Returns the transform associated with this transform node.
boolean	isCompositeNode()	Returns true if this node represents a composite transform that does not perform processing of its own, but merely encapsulates a sub-pipeline (which may be empty).
boolean	isRootNode()
void	replaceChild(TransformHierarchy.Node existing, TransformHierarchy.Node replacement)	Replace a sub-node of this transform node.
AppliedPTransform<?,?,?>	toAppliedPTransform(Pipeline pipeline)	Returns the AppliedPTransform representing this TransformHierarchy.Node.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

getTransform

public @Nullable PTransform<?,?> getTransform()

Returns the transform associated with this transform node.

Returns:

null if and only if this is the root node of the graph, which has no associated transform

getEnclosingNode

public TransformHierarchy.Node getEnclosingNode()

Returns the enclosing composite transform node, or null if there is none.

addComposite

public void addComposite(TransformHierarchy.Node node)

Adds a composite operation to the transform node.

As soon as a node is added, the transform node is considered a composite operation instead of a primitive transform.

replaceChild

public void replaceChild(TransformHierarchy.Node existing,
                         TransformHierarchy.Node replacement)

Replace a sub-node of this transform node.

The existing TransformHierarchy.Node must be a direct child of this TransformHierarchy.Node. The replacement node need not be fully specified.

isCompositeNode

public boolean isCompositeNode()

Returns true if this node represents a composite transform that does not perform processing of its own, but merely encapsulates a sub-pipeline (which may be empty).

Note that a node may be composite with no sub-transforms if it returns its input directly extracts a component of a tuple, or other operations that occur at pipeline assembly time.

isRootNode

public boolean isRootNode()

getFullName

public java.lang.String getFullName()

getInputs

public java.util.Map<TupleTag<?>,PCollection<?>> getInputs()

Returns the transform input, in fully expanded form.

getOutputs

public java.util.Map<TupleTag<?>,PCollection<?>> getOutputs()

Returns the transform output, in expanded form.

toAppliedPTransform

public AppliedPTransform<?,?,?> toAppliedPTransform(Pipeline pipeline)

Returns the AppliedPTransform representing this TransformHierarchy.Node.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object