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274 changes: 274 additions & 0 deletions
274
...-api/src/main/java/org/dspace/app/filetype/consumer/FileTypeMetadataEnhancerConsumer.java
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/** | ||
* The contents of this file are subject to the license and copyright | ||
* detailed in the LICENSE and NOTICE files at the root of the source | ||
* tree and available online at | ||
* | ||
* http://www.dspace.org/license/ | ||
*/ | ||
package org.dspace.app.filetype.consumer; | ||
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import static org.dspace.util.FunctionalUtils.throwingConsumerWrapper; | ||
import static org.dspace.util.FunctionalUtils.throwingMapperWrapper; | ||
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import java.sql.SQLException; | ||
import java.text.MessageFormat; | ||
import java.util.Collection; | ||
import java.util.HashSet; | ||
import java.util.List; | ||
import java.util.Map; | ||
import java.util.Objects; | ||
import java.util.Optional; | ||
import java.util.Set; | ||
import java.util.function.Predicate; | ||
import java.util.stream.Collectors; | ||
import java.util.stream.Stream; | ||
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import org.apache.commons.codec.binary.StringUtils; | ||
import org.dspace.content.Bitstream; | ||
import org.dspace.content.Bundle; | ||
import org.dspace.content.DSpaceObject; | ||
import org.dspace.content.Item; | ||
import org.dspace.content.MetadataField; | ||
import org.dspace.content.MetadataFieldName; | ||
import org.dspace.content.MetadataValue; | ||
import org.dspace.content.factory.ContentServiceFactory; | ||
import org.dspace.content.service.BitstreamService; | ||
import org.dspace.content.service.ItemService; | ||
import org.dspace.core.Constants; | ||
import org.dspace.core.Context; | ||
import org.dspace.core.exception.SQLRuntimeException; | ||
import org.dspace.event.Consumer; | ||
import org.dspace.event.Event; | ||
import org.slf4j.Logger; | ||
import org.slf4j.LoggerFactory; | ||
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public class FileTypeMetadataEnhancerConsumer implements Consumer { | ||
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private static final Logger logger = LoggerFactory.getLogger(FileTypeMetadataEnhancerConsumer.class); | ||
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protected static final MetadataFieldName entityTypeMetadata = new MetadataFieldName("dc", "type"); | ||
protected static final MetadataFieldName fileTypeMetadata = new MetadataFieldName("dspace", "file", "type"); | ||
private static final List<MetadataFieldName> itemMetadatas = List.of(fileTypeMetadata); | ||
private static final List<MetadataFieldName> bitstreamMetadatas = List.of(entityTypeMetadata); | ||
private static final Map<String, MetadataFieldName> bitstreamToItemMetadatasMap = Map.of( | ||
entityTypeMetadata.toString(), fileTypeMetadata | ||
); | ||
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private BitstreamService bitstreamService; | ||
private ItemService itemService; | ||
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private Set<Bitstream> bitstreamAlreadyProcessed = new HashSet<>(); | ||
private Set<Item> itemsToProcess = new HashSet<>(); | ||
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@Override | ||
public void initialize() throws Exception { | ||
this.bitstreamService = ContentServiceFactory.getInstance().getBitstreamService(); | ||
this.itemService = ContentServiceFactory.getInstance().getItemService(); | ||
} | ||
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@Override | ||
public void consume(Context ctx, Event event) throws Exception { | ||
if (Constants.BITSTREAM == event.getSubjectType()) { | ||
this.handleBitStreamConsumer( | ||
ctx, | ||
Optional.ofNullable((Bitstream) event.getObject(ctx)) | ||
.orElse(this.loadBitstream(ctx, event)), | ||
event | ||
); | ||
} else if (Constants.ITEM == event.getSubjectType() && Event.CREATE == event.getEventType()) { | ||
this.handleItemConsumer( | ||
ctx, | ||
Optional.ofNullable((Item) event.getObject(ctx)) | ||
.orElse(this.loadItem(ctx, event)) | ||
); | ||
} else { | ||
logger.warn( | ||
"Can't consume the DSPaceObject with id {}, only BITSTREAM and ITEMS'CREATION events are consumable!", | ||
event.getSubjectID() | ||
); | ||
} | ||
} | ||
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@Override | ||
public void end(Context ctx) throws Exception { | ||
bitstreamAlreadyProcessed.clear(); | ||
this.itemsToProcess | ||
.stream() | ||
.forEach(item -> this.handleItemConsumer(ctx, item)); | ||
itemsToProcess.clear(); | ||
} | ||
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@Override | ||
public void finish(Context ctx) throws Exception {} | ||
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private Bitstream loadBitstream(Context ctx, Event event) { | ||
Bitstream found = null; | ||
try { | ||
found = this.bitstreamService.find(ctx, event.getSubjectID()); | ||
} catch (SQLException e) { | ||
logger.error("Error while retrieving the bitstream with ID: " + event.getSubjectID(), e); | ||
throw new SQLRuntimeException("Error while retrieving the bitstream with ID: " + event.getSubjectID(), e); | ||
} | ||
return found; | ||
} | ||
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private Item loadItem(Context ctx, Event event) { | ||
Item found = null; | ||
try { | ||
found = this.itemService.find(ctx, event.getSubjectID()); | ||
} catch (SQLException e) { | ||
logger.error("Error while retrieving the bitstream with ID: " + event.getSubjectID(), e); | ||
throw new SQLRuntimeException("Error while retrieving the bitstream with ID: " + event.getSubjectID(), e); | ||
} | ||
return found; | ||
} | ||
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private void handleBitStreamConsumer(Context ctx, Bitstream bitstream, Event event) { | ||
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if (bitstream == null || this.alreadyProcessed(bitstream)) { | ||
return; | ||
} | ||
List<Item> bitstreamItems = List.of(); | ||
try { | ||
bitstreamItems = bitstream.getBundles() | ||
.stream() | ||
.filter(bundle -> "ORIGINAL".equals(bundle.getName())) | ||
.map(Bundle::getItems) | ||
.flatMap(Collection::stream) | ||
.collect(Collectors.toList()); | ||
} catch (Exception e) { | ||
throw new RuntimeException(e); | ||
} finally { | ||
bitstreamAlreadyProcessed.add(bitstream); | ||
bitstreamItems | ||
.stream() | ||
.forEach(item -> this.itemsToProcess.add(item)); | ||
} | ||
} | ||
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private void handleItemConsumer(Context ctx, Item item) { | ||
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if (item == null) { | ||
return; | ||
} | ||
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try { | ||
Item loadedItem = this.itemService.find(ctx, item.getID()); | ||
Map<MetadataField, List<String>> grouped = | ||
Optional.ofNullable(loadedItem) | ||
.map(i -> i.getBundles("ORIGINAL")) | ||
.filter(bundles -> !bundles.isEmpty()) | ||
.map(bundles -> bundles.get(0)) | ||
.map(Bundle::getBitstreams) | ||
.filter(bitstreams -> !bitstreams.isEmpty()) | ||
.map(bitstreams -> getMetadatasForItem(ctx, bitstreams).collect(Collectors.toList())) | ||
.map(metadatas -> groupByMetadataField(metadatas)) | ||
.filter(metadatas -> !metadatas.isEmpty()) | ||
.orElse(Map.of()); | ||
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this.itemService.removeMetadataValues(ctx, loadedItem, getRemovableMetadatas(loadedItem)); | ||
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grouped | ||
.entrySet() | ||
.stream() | ||
.map(entry -> | ||
Map.entry(bitstreamToItemMetadatasMap.get(entry.getKey().toString('.')), entry.getValue()) | ||
) | ||
.filter(entry -> entry.getKey() != null) | ||
.forEach( | ||
throwingConsumerWrapper(entry -> | ||
this.addMetadata( | ||
ctx, | ||
loadedItem, | ||
entry.getKey(), | ||
entry.getValue() | ||
) | ||
) | ||
); | ||
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} catch (SQLException e) { | ||
logger.error(MessageFormat.format("Error while processing item {}!", item.getID().toString()), e); | ||
throw new SQLRuntimeException(e); | ||
} | ||
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} | ||
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private void addMetadata(Context ctx, Item loadedItem, MetadataFieldName metadata, List<String> value) | ||
throws SQLException { | ||
this.itemService.addMetadata( | ||
ctx, | ||
loadedItem, | ||
metadata.schema, | ||
metadata.element, | ||
metadata.qualifier, | ||
null, | ||
value | ||
); | ||
} | ||
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private Stream<MetadataValue> getMetadatasForItem(Context ctx, List<Bitstream> bitstreams) { | ||
return bitstreams | ||
.stream() | ||
.map( | ||
throwingMapperWrapper(bitstream -> | ||
this.bitstreamService.find(ctx, bitstream.getID()), | ||
null | ||
) | ||
) | ||
.filter(Objects::nonNull) | ||
.flatMap(bitstream -> filterBitstreamMetadatasForItem(bitstream)); | ||
} | ||
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private Stream<MetadataValue> filterBitstreamMetadatasForItem(Bitstream bitstream) { | ||
return bitstream.getMetadata() | ||
.stream() | ||
.filter( | ||
metadataFilter( | ||
bitstreamMetadatas | ||
) | ||
); | ||
} | ||
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private Map<MetadataField, List<String>> groupByMetadataField(List<MetadataValue> metadatas) { | ||
return this.collectByGroupingMetadataFieldMappingValue(metadatas.stream()); | ||
} | ||
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private Map<MetadataField, List<String>> collectByGroupingMetadataFieldMappingValue(Stream<MetadataValue> stream) { | ||
return stream | ||
.collect( | ||
Collectors.groupingBy( | ||
MetadataValue::getMetadataField, | ||
Collectors.mapping(MetadataValue::getValue, Collectors.toList()) | ||
) | ||
); | ||
} | ||
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private boolean alreadyProcessed(Bitstream bitstream) { | ||
return bitstreamAlreadyProcessed.contains(bitstream); | ||
} | ||
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private List<MetadataValue> getRemovableMetadatas(DSpaceObject dspaceObject) { | ||
return dspaceObject | ||
.getMetadata() | ||
.stream() | ||
.filter( | ||
metadataFilter( | ||
itemMetadatas | ||
) | ||
) | ||
.collect(Collectors.toList()); | ||
} | ||
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private Predicate<? super MetadataValue> metadataFilter(List<MetadataFieldName> metadataFields) { | ||
return metadata -> | ||
metadataFields | ||
.stream() | ||
.filter(field -> | ||
StringUtils.equals(field.schema, metadata.getSchema()) && | ||
StringUtils.equals(field.element, metadata.getElement()) && | ||
StringUtils.equals(field.qualifier, metadata.getQualifier()) | ||
) | ||
.findFirst() | ||
.isPresent(); | ||
} | ||
} |
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