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/*
* 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.history;
import java.time.Instant;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import org.apache.logging.log4j.LogManager;
import org.mycore.backend.jpa.MCREntityManagerProvider;
import org.mycore.common.events.MCREvent;
import org.mycore.common.events.MCREventHandlerBase;
import org.mycore.datamodel.classifications2.MCRCategoryID;
import org.mycore.datamodel.metadata.MCRDerivate;
import org.mycore.datamodel.metadata.MCRObject;
import org.mycore.datamodel.metadata.MCRObjectID;
/**
* @author Thomas Scheffler
*
*/
public class MCRMetadataHistoryManager extends MCREventHandlerBase {
public static Optional getHighestStoredID(String project, String type) {
String looksLike = Objects.requireNonNull(project) + "\\_" + Objects.requireNonNull(type) + "%";
EntityManager em = MCREntityManagerProvider.getCurrentEntityManager();
TypedQuery query = em.createNamedQuery("MCRMetaHistory.getHighestID", MCRObjectID.class);
query.setParameter("looksLike", looksLike);
return Optional.ofNullable(query.getSingleResult());
}
public static Optional getHistoryStart() {
EntityManager em = MCREntityManagerProvider.getCurrentEntityManager();
TypedQuery query = em.createNamedQuery("MCRMetaHistory.getFirstDate", Instant.class);
return Optional.ofNullable(query.getSingleResult());
}
public static Map getDeletedItems(Instant from, Optional until) {
EntityManager em = MCREntityManagerProvider.getCurrentEntityManager();
TypedQuery query = em.createNamedQuery("MCRMetaHistory.getLastEventByID",
MCRMetaHistoryItem.class);
query.setParameter("from", from);
query.setParameter("until", until.orElseGet(Instant::now));
query.setParameter("eventType", MCRMetadataHistoryEventType.Delete);
return query.getResultList()
.stream()
.collect(Collectors.toMap(MCRMetaHistoryItem::getId, MCRMetaHistoryItem::getTime));
}
public static Optional getLastDeletedDate(MCRObjectID identifier) {
EntityManager em = MCREntityManagerProvider.getCurrentEntityManager();
TypedQuery query = em.createNamedQuery("MCRMetaHistory.getLastOfType", Instant.class);
query.setParameter("id", identifier);
query.setParameter("type", MCRMetadataHistoryEventType.Delete);
return Optional.ofNullable(query.getSingleResult());
}
private void createNow(MCRObjectID id) {
store(MCRMetaHistoryItem.createdNow(id));
}
private void deleteNow(MCRObjectID id) {
store(MCRMetaHistoryItem.deletedNow(id));
}
private void store(MCRMetaHistoryItem item) {
EntityManager em = MCREntityManagerProvider.getCurrentEntityManager();
em.persist(item);
}
@Override
protected void handleObjectCreated(MCREvent evt, MCRObject obj) {
createNow(obj.getId());
if (objectIsHidden(obj)) {
deleteNow(obj.getId());
}
}
@Override
protected void handleObjectUpdated(MCREvent evt, MCRObject obj) {
MCRObject oldVersion = (MCRObject) evt.get(MCREvent.OBJECT_OLD_KEY);
if (updateRequired(oldVersion, obj)) {
if (objectIsHidden(obj)) {
deleteNow(obj.getId());
} else {
createNow(obj.getId());
}
}
}
@Override
protected void handleObjectDeleted(MCREvent evt, MCRObject obj) {
deleteNow(obj.getId());
}
@Override
protected void handleDerivateCreated(MCREvent evt, MCRDerivate der) {
createNow(der.getId());
if (!der.getDerivate().isDisplayEnabled()) {
deleteNow(der.getId());
}
}
@Override
protected void handleDerivateUpdated(MCREvent evt, MCRDerivate der) {
MCRDerivate oldVersion = (MCRDerivate) evt.get(MCREvent.DERIVATE_OLD_KEY);
if (updateRequired(oldVersion, der)) {
if (der.getDerivate().isDisplayEnabled()) {
createNow(der.getId());
} else {
deleteNow(der.getId());
}
}
}
@Override
protected void handleDerivateDeleted(MCREvent evt, MCRDerivate der) {
deleteNow(der.getId());
}
private boolean updateRequired(MCRObject oldVersion, MCRObject newVersion) {
return objectIsHidden(oldVersion) != objectIsHidden(newVersion);
}
static boolean objectIsHidden(MCRObject obj) {
MCRCategoryID state = obj.getService().getState();
if (state == null) {
LogManager.getLogger().debug("{} is visible as it does not use a service state.", obj.getId());
return false;
}
boolean hidden = !"published".equals(state.getID());
LogManager.getLogger().debug("{} is hidden due to service state '{}': {}", obj.getId(), state, hidden);
return hidden;
}
private boolean updateRequired(MCRDerivate oldVersion, MCRDerivate newVersion) {
return oldVersion.getDerivate().isDisplayEnabled() != newVersion.getDerivate().isDisplayEnabled();
}
}