See: Description
| Class | Description | 
|---|---|
| DoFnRunnerFactory<InputT,OutputT> | a serializable  SimpleDoFnRunner. | 
| NoOpStepContext | serializable  StepContextthat basically does nothing. | 
| TranslatorUtils | Utility methods for translators. | 
| TranslatorUtils.FromRawUnionValue<OutputT> | Converts @link{RawUnionValue} to @link{WindowedValue}. | 
| TranslatorUtils.RawUnionValue | This is copied from org.apache.beam.sdk.transforms.join.RawUnionValue. |