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ListPropertyStrategy.java
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ListPropertyStrategy.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.oom;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.metamodel.ListAttribute;
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.net.URI;
import java.util.List;
abstract class ListPropertyStrategy<L extends ListDescriptor, V extends ListValueDescriptor, X>
extends PluralObjectPropertyStrategy<X> {
final ListAttribute<? super X, ?> listAttribute;
public ListPropertyStrategy(EntityType<X> et, ListAttribute<? super X, ?> att, Descriptor descriptor,
EntityMappingHelper mapper) {
super(et, att, descriptor, mapper);
this.listAttribute = att;
}
@Override
protected void buildAxiomValuesFromInstance(X instance, AxiomValueGatherer valueBuilder)
throws IllegalAccessException {
final Object value = extractFieldValueFromInstance(instance);
assert value instanceof List || value == null;
extractListValues((List<?>) value, instance, valueBuilder);
}
<K> void addListElementsToListValueDescriptor(ListValueDescriptor listDescriptor, List<K> list) {
if (list == null) {
return;
}
if (IdentifierTransformer.isValidIdentifierType(pluralAtt.getBindableJavaType())) {
list.stream().filter(item -> item != null)
.forEach(item -> listDescriptor.addValue(NamedResource.create(IdentifierTransformer.valueAsUri(item))));
} else {
final Class<K> elemType = (Class<K>) listAttribute.getBindableJavaType();
final EntityType<K> valueType = mapper.getEntityType(elemType);
for (K item : list) {
if (item == null) {
continue;
}
final URI itemUri = resolveValueIdentifier(item, valueType);
listDescriptor.addValue(NamedResource.create(itemUri));
}
}
}
abstract L createListDescriptor(Axiom<?> ax);
abstract V createListValueDescriptor(X instance);
abstract <K> void extractListValues(List<K> list, X instance, AxiomValueGatherer valueBuilder);
}