| Class | Description | 
|---|---|
| DataHolderHelper | 
 Helper for implementations of data holder 
 | 
| DefaultModelAwareDataHolder | 
 Default implementation for data holder with model 
 | 
| DefaultModelLessDataHolder | 
 Default implementation for data holder without model 
 | 
| DefaultModifiableModelAwareDataHolder | 
 Default implementation for modifiable data holder with model 
 | 
| DefaultModifiableModelLessDataHolder | 
 Default implementation for modifiable data holder without model 
 |