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ListPropertyStrategy.java
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ListPropertyStrategy.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.oom;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.metamodel.ListAttributeImpl;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import cz.cvut.kbss.jopa.utils.IdentifierTransformer;
import cz.cvut.kbss.ontodriver.descriptor.ListDescriptor;
import cz.cvut.kbss.ontodriver.descriptor.ListValueDescriptor;
import cz.cvut.kbss.ontodriver.model.Axiom;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
abstract class ListPropertyStrategy<L extends ListDescriptor, V extends ListValueDescriptor, X>
extends PluralObjectPropertyStrategy<ListAttributeImpl<? super X, ?>, X> {
ListPropertyStrategy(EntityType<X> et, ListAttributeImpl<? super X, ?> att, Descriptor descriptor,
EntityMappingHelper mapper) {
super(et, att, descriptor, mapper);
}
@Override
protected void buildAxiomValuesFromInstance(X instance, AxiomValueGatherer valueBuilder) {
final Object value = extractFieldValueFromInstance(instance);
assert value instanceof List || value == null;
extractListValues((List<?>) value, instance, valueBuilder);
}
/**
* Adds elements of the list to the value descriptor.
*/
<K> void addListElementsToListValueDescriptor(ListValueDescriptor listDescriptor, List<K> list) {
if (list == null) {
return;
}
if (IdentifierTransformer.isValidIdentifierType(attribute.getBindableJavaType())) {
list.stream().filter(Objects::nonNull)
.forEach(item -> listDescriptor.addValue(NamedResource.create(IdentifierTransformer.valueAsUri(item))));
} else {
final Class<?> elemType = attribute.getBindableJavaType();
final EntityType<?> valueType = mapper.getEntityType(elemType);
addItemsToDescriptor(listDescriptor, list, valueType);
}
}
static void addItemsToDescriptor(ListValueDescriptor listDescriptor, List<?> list, EntityType<?> valueType) {
list.stream().filter(Objects::nonNull).forEach(item -> listDescriptor
.addValue(NamedResource.create(EntityPropertiesUtils.getIdentifier(item, valueType))));
}
<K> List<K> resolveUnpersistedItems(List<K> list) {
if (list == null) {
return Collections.emptyList();
}
if (IdentifierTransformer.isValidIdentifierType(attribute.getBindableJavaType())) {
return Collections.emptyList();
} else {
return list.stream().filter(item -> item != null && !referenceSavingResolver
.shouldSaveReferenceToItem(item, getAttributeValueContexts())).collect(Collectors.toList());
}
}
abstract L createListDescriptor(Axiom<?> ax);
abstract V createListValueDescriptor(X instance);
abstract <K> void extractListValues(List<K> list, X instance, AxiomValueGatherer valueBuilder);
}