TransformHierarchy (Google Cloud Dataflow SDK API)

```
public class TransformHierarchy
extends java.lang.Object
```
Captures information about a collection of transformations and their associated PValues.

Constructors
Constructor and Description
`TransformHierarchy()`

Methods
Modifier and Type	Method and Description
`void`	`addInput(TransformTreeNode node, PInput input)` Adds an input to the given node.
`TransformTreeNode`	`getCurrent()` Returns the last TransformTreeNode on the stack.
`TransformTreeNode`	`getNode(PTransform<?,?> transform)` Returns the TransformTreeNode associated with a given transform.
`void`	`popNode()` Removes the last TransformTreeNode from the stack.
`void`	`pushNode(TransformTreeNode current)` Add a TransformTreeNode to the stack.
`void`	`setOutput(TransformTreeNode producer, POutput output)` Sets the output of a transform node.
`void`	`visit(Pipeline.PipelineVisitor visitor, java.util.Set<PValue> visitedNodes)` Visits all nodes in the transform hierarchy, in transitive order.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

getCurrent
```
public TransformTreeNode getCurrent()
```
Returns the last TransformTreeNode on the stack.

public void pushNode(TransformTreeNode current)

Add a TransformTreeNode to the stack.

popNode
```
public void popNode()
```
Removes the last TransformTreeNode from the stack.

public void addInput(TransformTreeNode node,
            PInput input)

Adds an input to the given node.

This forces the producing node to be finished.

public void setOutput(TransformTreeNode producer,
             POutput output)

Sets the output of a transform node.

getNode
```
public TransformTreeNode getNode(PTransform<?,?> transform)
```
Returns the TransformTreeNode associated with a given transform.

public void visit(Pipeline.PipelineVisitor visitor,
         java.util.Set<PValue> visitedNodes)

Visits all nodes in the transform hierarchy, in transitive order.

Class TransformHierarchy