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RefreshInstanceMerger.java
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RefreshInstanceMerger.java
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/**
* Copyright (C) 2020 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.adapters.IndirectCollection;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.sessions.merge.DefaultValueMerger;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
/**
* Merges changes during instance refresh.
* <p>
* This means overwriting any changes made to the entity.
*/
class RefreshInstanceMerger {
private final DefaultValueMerger merger;
private final IndirectWrapperHelper indirectWrapperHelper;
RefreshInstanceMerger(IndirectWrapperHelper indirectWrapperHelper) {
this.indirectWrapperHelper = indirectWrapperHelper;
this.merger = new DefaultValueMerger();
}
/**
* Merges changes in the opposite direction, i.e. changes made on the clone are overwritten by the original values.
*
* @param changeSet Changes done
*/
void mergeChanges(ObjectChangeSet changeSet) {
final Object source = changeSet.getChangedObject();
final Object target = changeSet.getCloneObject();
for (ChangeRecord change : changeSet.getChanges()) {
final FieldSpecification<?, ?> att = change.getAttribute();
final Object sourceValue = EntityPropertiesUtils.getAttributeValue(att, source);
if (sourceValue instanceof IndirectCollection) {
final IndirectCollection<?> col = (IndirectCollection<?>) sourceValue;
final Object ic = indirectWrapperHelper
.createIndirectWrapper(col.unwrap(), target, att.getJavaField());
merger.mergeValue(att, target, ic);
} else {
merger.mergeValue(att, target, sourceValue);
}
}
}
}