BuilderKey

java.lang.Object
- akka.stream.impl.BuilderKey

All Implemented Interfaces:

TraversalBuildStep
```
public final class BuilderKey
extends java.lang.Object
implements TraversalBuildStep
```
INTERNAL API
Helper class that is only used to identify a TraversalBuilder in a CompositeTraversalBuilder. The reason why this is needed is because the builder is referenced at various places, while it needs to be mutated. In an immutable data structure this is best done with an indirection, i.e. places refer to this immutable key and look up the current state in an extra Map. See comments in akka.stream.impl.package for more details.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  BuilderKey()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  java.lang.String toString()
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - BuilderKey
```
public BuilderKey()
```
- Method Detail
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object