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MergeManagerImpl.java
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MergeManagerImpl.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
* <p>
* This program 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.
* <p>
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.sessions;
import cz.cvut.kbss.jopa.exceptions.OWLPersistenceException;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import java.util.Objects;
public class MergeManagerImpl implements MergeManager {
protected UnitOfWorkImpl uow;
protected CloneBuilder builder;
MergeManagerImpl(UnitOfWorkImpl session) {
this.uow = session;
this.builder = session.getCloneBuilder();
}
private void deleteObjectFromCache(ObjectChangeSet changeSet) {
Object original = changeSet.getChangedObject();
if (original != null) {
uow.removeObjectFromCache(original, changeSet.getEntityContext());
}
}
@Override
public Object mergeChangesOnObject(ObjectChangeSet changeSet) {
Objects.requireNonNull(changeSet);
final Object clone = changeSet.getCloneObject();
if (clone == null) {
return null;
}
final Object original = changeSet.getChangedObject();
if (original == null) {
// If the original is null, then we may have a new object
// but this should not happen since new objects are handled separately
if (uow.isObjectNew(clone)) {
mergeNewObject(changeSet);
} else {
throw new OWLPersistenceException("Cannot find the original object.");
}
} else {
builder.mergeChanges(changeSet);
final Object identifier = EntityPropertiesUtils.getPrimaryKey(original, uow.getMetamodel());
uow.putObjectIntoCache(identifier, original, changeSet.getEntityDescriptor());
}
return clone;
}
@Override
public void mergeChangesFromChangeSet(UnitOfWorkChangeSet changeSet) {
for (ObjectChangeSet objectChangeSet : changeSet.getExistingObjectsChanges()) {
mergeChangesOnObject(objectChangeSet);
}
changeSet.getNewObjects().forEach(this::mergeNewObject);
changeSet.getDeletedObjects().forEach(this::deleteObjectFromCache);
}
@Override
public void mergeNewObject(ObjectChangeSet changeSet) {
if (changeSet == null) {
return;
}
if (!changeSet.isNew()) {
mergeChangesOnObject(changeSet);
return;
}
// Put the original object into the shared session cache
Object newObject = changeSet.getChangedObject();
final Object identifier = EntityPropertiesUtils.getPrimaryKey(newObject, uow.getMetamodel());
uow.putObjectIntoCache(identifier, newObject, changeSet.getEntityDescriptor());
}
}