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SingularObjectPropertyStrategy.java
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SingularObjectPropertyStrategy.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.exceptions.CardinalityConstraintViolatedException;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.Attribute;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import cz.cvut.kbss.jopa.utils.IdentifierTransformer;
import cz.cvut.kbss.ontodriver.model.Assertion;
import cz.cvut.kbss.ontodriver.model.Axiom;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import cz.cvut.kbss.ontodriver.model.Value;
import java.net.URI;
class SingularObjectPropertyStrategy<X> extends FieldStrategy<Attribute<? super X, ?>, X> {
private Object value;
SingularObjectPropertyStrategy(EntityType<X> et, Attribute<? super X, ?> att,
Descriptor descriptor, EntityMappingHelper mapper) {
super(et, att, descriptor, mapper);
}
@Override
void addValueFromAxiom(Axiom<?> ax) {
assert ax.getValue().getValue() instanceof NamedResource;
final NamedResource valueIdentifier = (NamedResource) ax.getValue().getValue();
final Object newValue;
if (IdentifierTransformer.isValidIdentifierType(attribute.getJavaType())) {
newValue = IdentifierTransformer
.transformToIdentifier(valueIdentifier.getIdentifier(), attribute.getJavaType());
} else {
newValue = mapper
.getEntityFromCacheOrOntology(attribute.getJavaType(), valueIdentifier.getIdentifier(),
attributeDescriptor);
}
verifyCardinality(ax.getSubject());
this.value = newValue;
}
private void verifyCardinality(NamedResource subject) {
if (value != null) {
throw new CardinalityConstraintViolatedException(
"Expected single value of attribute " + attribute.getName() + " of instance " + subject +
", but got multiple.");
}
}
@Override
void buildInstanceFieldValue(Object instance) {
setValueOnInstance(instance, value);
}
@Override
void buildAxiomValuesFromInstance(X instance, AxiomValueGatherer valueBuilder) {
final Object extractedValue = extractFieldValueFromInstance(instance);
if (referenceSavingResolver
.shouldSaveReference(attribute.getJavaType(), extractedValue, getAttributeContext())) {
final Value<NamedResource> value = extractReferenceIdentifier(extractedValue);
valueBuilder.addValue(createAssertion(), value, getAttributeContext());
} else {
referenceSavingResolver
.registerPendingReference(valueBuilder.getSubjectIdentifier(), createAssertion(), extractedValue,
getAttributeContext());
}
}
private <V> Value<NamedResource> extractReferenceIdentifier(final V value) {
if (value == null) {
return Value.nullValue();
}
if (IdentifierTransformer.isValidIdentifierType(attribute.getJavaType())) {
return new Value<>(NamedResource.create(IdentifierTransformer.valueAsUri(value)));
}
final EntityType<? super V> valEt = (EntityType<? super V>) mapper.getEntityType(attribute.getJavaType());
assert valEt != null;
final URI id = EntityPropertiesUtils.getIdentifier(value, valEt);
return id != null ? new Value<>(NamedResource.create(id)) : Value.nullValue();
}
@Override
Assertion createAssertion() {
return Assertion.createObjectPropertyAssertion(attribute.getIRI().toURI(), attribute.isInferred());
}
}