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CollectionValueMerger.java
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CollectionValueMerger.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.merge;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.CollectionType;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.model.metamodel.PluralAttribute;
import cz.cvut.kbss.jopa.model.metamodel.TypesSpecification;
import cz.cvut.kbss.jopa.sessions.ChangeRecord;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import cz.cvut.kbss.jopa.utils.CollectionFactory;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import cz.cvut.kbss.jopa.utils.MetamodelUtils;
import java.util.Collection;
class CollectionValueMerger implements ValueMerger {
private final UnitOfWorkImpl uow;
private final ManagedTypeValueMerger managedTypeMerger;
CollectionValueMerger(UnitOfWorkImpl uow, ManagedTypeValueMerger managedTypeMerger) {
this.uow = uow;
this.managedTypeMerger = managedTypeMerger;
}
@Override
public void mergeValue(Object target, ChangeRecord changeRecord, Descriptor attributeDescriptor) {
final FieldSpecification<?, ?> att = changeRecord.getAttribute();
final Collection<?> mergedCol = (Collection<?>) changeRecord.getNewValue();
if (mergedCol == null) {
EntityPropertiesUtils.setFieldValue(att.getJavaField(), target, null);
return;
}
final Collection<Object> newValue = CollectionFactory
.createDefaultCollection(CollectionType.fromClass(att.getJavaType()));
boolean elemTypeManaged = false;
if (att instanceof PluralAttribute) {
elemTypeManaged = uow.isEntityType(((PluralAttribute) att).getBindableJavaType());
}
for (Object item : mergedCol) {
newValue.add(elemTypeManaged ? managedTypeMerger.getValueToSet(item, attributeDescriptor) : item);
}
extendModuleExtractionSignature(att, newValue);
EntityPropertiesUtils.setFieldValue(att.getJavaField(), target, newValue);
}
private void extendModuleExtractionSignature(FieldSpecification<?, ?> att, Collection<?> value) {
if (att instanceof TypesSpecification) {
MetamodelUtils.checkForModuleSignatureExtension(value, uow.getMetamodel());
}
}
}