org.mycore.datamodel.metadata.MCRFileMetaEventHandler Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MyCoRe. If not, see .
*/
package org.mycore.datamodel.metadata;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.mycore.access.MCRAccessException;
import org.mycore.common.MCRPersistenceException;
import org.mycore.common.events.MCREvent;
import org.mycore.common.events.MCREventHandlerBase;
import org.mycore.common.events.MCREventManager;
import org.mycore.datamodel.classifications2.MCRCategLinkReference;
import org.mycore.datamodel.classifications2.MCRCategLinkService;
import org.mycore.datamodel.classifications2.MCRCategLinkServiceFactory;
import org.mycore.datamodel.classifications2.MCRCategoryID;
import org.mycore.datamodel.niofs.MCRPath;
/**
* Handles category links to files
* @author Thomas Scheffler (yagee)
*
*/
public class MCRFileMetaEventHandler extends MCREventHandlerBase {
private static MCRCategLinkService CATEGLINK_SERVICE = MCRCategLinkServiceFactory.getInstance();
private static Logger LOGGER = LogManager.getLogger(MCRFileMetaEventHandler.class);
@Override
protected void handleDerivateCreated(MCREvent evt, MCRDerivate der) {
MCRObjectID derivateID = der.getId();
MCRObjectDerivate objectDerivate = der.getDerivate();
List fileMetadata = objectDerivate.getFileMetadata();
for (MCRFileMetadata metadata : fileMetadata) {
Collection categories = metadata.getCategories();
if (!categories.isEmpty()) {
MCRPath path = MCRPath.getPath(derivateID.toString(), metadata.getName());
MCRCategLinkReference linkReference = new MCRCategLinkReference(path);
CATEGLINK_SERVICE.setLinks(linkReference, categories);
}
}
}
@Override
protected void handleDerivateUpdated(MCREvent evt, MCRDerivate der) {
HashSet before = new HashSet<>();
before.addAll(CATEGLINK_SERVICE.getReferences(der.getId().toString()));
handleDerivateDeleted(evt, der);
handleDerivateCreated(evt, der);
HashSet after = new HashSet<>();
after.addAll(CATEGLINK_SERVICE.getReferences(der.getId().toString()));
HashSet combined = new HashSet<>(before);
combined.addAll(after);
for (MCRCategLinkReference ref : combined) {
MCRObjectID derId = der.getId();
String path = ref.getObjectID();
MCRPath file = MCRPath.getPath(derId.toString(), path);
BasicFileAttributes attrs;
try {
attrs = Files.readAttributes(file, BasicFileAttributes.class);
} catch (IOException e) {
LOGGER.warn("File is linked to category but cannot be read:{}{}", der.getId(), ref.getObjectID(), e);
continue;
}
MCREvent fileEvent = new MCREvent(MCREvent.PATH_TYPE, MCREvent.INDEX_EVENT);
fileEvent.put(MCREvent.PATH_KEY, file);
fileEvent.put(MCREvent.FILEATTR_KEY, attrs);
MCREventManager.instance().handleEvent(fileEvent);
}
}
@Override
protected void handleDerivateDeleted(MCREvent evt, MCRDerivate der) {
Collection references = CATEGLINK_SERVICE.getReferences(der.getId().toString());
CATEGLINK_SERVICE.deleteLinks(references);
}
@Override
protected void handlePathDeleted(MCREvent evt, Path path, BasicFileAttributes attrs) {
if (attrs.isDirectory()) {
return;
}
MCRPath mcrPath = MCRPath.toMCRPath(path);
MCRObjectID derivateID = MCRObjectID.getInstance(mcrPath.getOwner());
if (!MCRMetadataManager.exists(derivateID)) {
LOGGER.warn("Derivate {} from file '{}' does not exist.", derivateID, path);
return;
}
MCRDerivate derivate = MCRMetadataManager.retrieveMCRDerivate(derivateID);
MCRObjectDerivate objectDerivate = derivate.getDerivate();
String filePath = '/' + path.subpath(0, path.getNameCount()).toString();
Optional fileMetaWithoutURN = objectDerivate.getFileMetadata()
.stream()
.filter(m -> filePath.equals(m.getName()))
.filter(m -> m.getUrn() == null && m.getHandle() == null)
.findAny();
if (fileMetaWithoutURN.isPresent() && objectDerivate.deleteFileMetaData(filePath)) {
try {
MCRMetadataManager.update(derivate);
} catch (MCRPersistenceException | MCRAccessException e) {
throw new MCRPersistenceException("Could not update derivate: " + derivateID, e);
}
}
}
}