Package org.dspace.submit.listener

Class SimpleMetadataListener

java.lang.Object

org.dspace.submit.listener.SimpleMetadataListener

All Implemented Interfaces:

MetadataListener

public class SimpleMetadataListener
extends Object
implements MetadataListener

This is the basic implementation for the MetadataListener interface. It got the a map of metadata and related External Data Provider that can be used to retrieve further information using the updated metadata in the item

Author:

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

Constructor Summary

Constructors

Constructor	Description
SimpleMetadataListener()

Method Summary

Modifier and Type	Method	Description
protected String	generateExternalId(Context context, ExternalDataProvider prov, Item item, Set<String> changedMetadata, String m)	This is the simpler implementation, it assumes that the value of the metadata listened by the DataProvider can be used directly as identifier.
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
Map<String,List<ExternalDataProvider>>	getExternalDataProvidersMap()
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
void	setExternalDataProvidersMap(Map<String,List<ExternalDataProvider>> externalDataProvidersMap)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SimpleMetadataListener

public SimpleMetadataListener()

Method Detail

getExternalDataProvidersMap

public Map<String,List<ExternalDataProvider>> getExternalDataProvidersMap()

setExternalDataProvidersMap

public void setExternalDataProvidersMap(Map<String,List<ExternalDataProvider>> externalDataProvidersMap)

getMetadataToListen

public Set<String> getMetadataToListen()

Description copied from interface: MetadataListener

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

Specified by:

getMetadataToListen in interface MetadataListener

Returns:

the list of metadata to monitor

getExternalDataObject

public ExternalDataObject getExternalDataObject(Context context,
                                                Item item,
                                                Set<String> changedMetadata)

Description copied from interface: MetadataListener

Retrieve an ExternalDataObject to enrich the current item using the current metadata and the information about which listened metadata are changed

Specified by:

getExternalDataObject in interface MetadataListener

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

generateExternalId

protected String generateExternalId(Context context,
                                    ExternalDataProvider prov,
                                    Item item,
                                    Set<String> changedMetadata,
                                    String m)

This is the simpler implementation, it assumes that the value of the metadata listened by the DataProvider can be used directly as identifier. Subclass may extend it to add support for identifier normalization or combine multiple information to build the identifier

Parameters:

context - the DSpace Context Object

prov - the ExternalDataProvider that need to received an Id

item - the item

changedMetadata - the metadata that are recently changed

m - the changed metadata that lead to the selected ExternalDataProvider

Returns:

an Id if any that can be used to query the ExternalDataProvider