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DetachedInstanceMerger.java
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DetachedInstanceMerger.java
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/**
* Copyright (C) 2016 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;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.sessions.merge.DetachedValueMerger;
import cz.cvut.kbss.jopa.sessions.merge.ValueMerger;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
class DetachedInstanceMerger {
private final ValueMerger valueMerger;
DetachedInstanceMerger(UnitOfWorkImpl uow) {
this.valueMerger = new DetachedValueMerger(uow);
}
/**
* Merges changes from the detached instance being merged into persistence context (clone in the specified change
* set) into the corresponding managed instance (original in the change set).
*
* @param changeSet Set of changes to apply to the managed instance
* @return Managed instance with changes merged into it
*/
Object mergeChangesFromDetachedToManagedInstance(ObjectChangeSet changeSet, Descriptor descriptor) {
assert changeSet != null;
assert changeSet.getCloneObject() != null;
final Object original = changeSet.getChangedObject();
assert original != null;
for (ChangeRecord change : changeSet.getChanges()) {
final FieldSpecification<?, ?> fs = change.getAttribute();
final Object origValue = EntityPropertiesUtils.getAttributeValue(fs, original);
valueMerger
.mergeValue(fs, original, origValue, change.getNewValue(), descriptor.getAttributeDescriptor(fs));
}
return original;
}
}