MetadataListener (DSpace Kernel :: API and Implementation 7.6.1 API)

All Known Implementing Classes:

SimpleMetadataListener
```
public interface MetadataListener
```
The interface to implement to support the ExtractMetadata enrichment step

Author:

Andrea Bollini (andrea.bollini at 4science.it)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`ExternalDataObject`	`getExternalDataObject(Context context, Item item, Set<String> changedMetadata)`	Retrieve an ExternalDataObject to enrich the current item using the current metadata and the information about which listened metadata are changed
`Set<String>`	`getMetadataToListen()`	Return the list of metadata that should be monitored as change to them could allow the service to retrieve an ExternalDataObject to enrich the current item

- Method Detail
  - getMetadataToListen
```
Set<String> getMetadataToListen()
```
    Return the list of metadata that should be monitored as change to them could allow the service to retrieve an ExternalDataObject to enrich the current item
    
    Returns:
    
    the list of metadata to monitor
  - getExternalDataObject
```
ExternalDataObject getExternalDataObject(Context context,
                                         Item item,
                                         Set<String> changedMetadata)
```
    Retrieve an ExternalDataObject to enrich the current item using the current metadata and the information about which listened metadata are changed
    
    Parameters:
    
    context - the DSpace Context Object
    
    item - the item in its current status
    
    changedMetadata - the list of listened metadata that are changed
    
    Returns:
    
    an ExternalDataObject that can be used to enrich the current item