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DetachedValueMerger.java
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DetachedValueMerger.java
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/**
* Copyright (C) 2022 Czech Technical University in Prague
*
* 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.
*
* 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.merge;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.sessions.ChangeRecord;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import java.util.Collection;
import java.util.Map;
public class DetachedValueMerger implements ValueMerger {
private final UnitOfWorkImpl uow;
private final ValueMerger defaultValueMerger;
private final ManagedTypeValueMerger managedTypeMerger;
private final CollectionValueMerger collectionMerger;
private final MapValueMerger mapValueMerger;
public DetachedValueMerger(UnitOfWorkImpl uow) {
assert uow != null;
this.uow = uow;
this.defaultValueMerger = new DefaultValueMerger();
this.managedTypeMerger = new ManagedTypeValueMerger(uow);
this.collectionMerger = new CollectionValueMerger(uow, managedTypeMerger);
this.mapValueMerger = new MapValueMerger();
}
@Override
public void mergeValue(Object target, ChangeRecord changeRecord, Descriptor attributeDescriptor) {
getMerger(changeRecord.getAttribute()).mergeValue(target, changeRecord, attributeDescriptor);
}
private ValueMerger getMerger(FieldSpecification<?, ?> att) {
if (uow.isEntityType(att.getJavaType())) {
return managedTypeMerger;
} else if (Collection.class.isAssignableFrom(att.getJavaType())) {
return collectionMerger;
} else if (Map.class.isAssignableFrom(att.getJavaType())) {
return mapValueMerger;
} else {
return defaultValueMerger;
}
}
}