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AxiomDescriptorFactory.java
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AxiomDescriptorFactory.java
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/**
* Copyright (C) 2019 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.oom;
import cz.cvut.kbss.jopa.model.JOPAPersistenceProperties;
import cz.cvut.kbss.jopa.model.annotations.FetchType;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.metamodel.*;
import cz.cvut.kbss.jopa.sessions.LoadingParameters;
import cz.cvut.kbss.jopa.utils.Configuration;
import cz.cvut.kbss.ontodriver.descriptor.AxiomDescriptor;
import cz.cvut.kbss.ontodriver.model.*;
import java.lang.reflect.Field;
import java.net.URI;
class AxiomDescriptorFactory {
private final String puLanguage;
AxiomDescriptorFactory(Configuration configuration) {
this.puLanguage = configuration.get(JOPAPersistenceProperties.LANG);
}
AxiomDescriptor createForEntityLoading(LoadingParameters<?> loadingParams, EntityType<?> et) {
final AxiomDescriptor descriptor = new AxiomDescriptor(NamedResource.create(loadingParams.getIdentifier()));
descriptor.setSubjectContext(loadingParams.getDescriptor().getContext());
descriptor.addAssertion(Assertion.createClassAssertion(false));
addForTypes(loadingParams, et, descriptor);
addForProperties(loadingParams, et, descriptor);
for (Attribute<?, ?> att : et.getAttributes()) {
if (!shouldLoad(att.getFetchType(), loadingParams.isForceEager())) {
continue;
}
final Assertion a = createAssertion(att, loadingParams.getDescriptor().getAttributeDescriptor(att));
addAssertionToDescriptor(loadingParams.getDescriptor(), att, descriptor, a);
}
return descriptor;
}
private void addForTypes(LoadingParameters<?> loadingParams, EntityType<?> et, AxiomDescriptor descriptor) {
final TypesSpecification<?, ?> types = et.getTypes();
if (types != null && shouldLoad(types.getFetchType(), loadingParams.isForceEager())) {
final Assertion typesAssertion = Assertion.createClassAssertion(types.isInferred());
addAssertionToDescriptor(loadingParams.getDescriptor(), types, descriptor, typesAssertion);
}
}
private static boolean shouldLoad(FetchType fetchType, boolean forceLoad) {
return fetchType != FetchType.LAZY || forceLoad;
}
private void addAssertionToDescriptor(Descriptor entityDescriptor, FieldSpecification<?, ?> att,
final AxiomDescriptor descriptor, final Assertion assertion) {
descriptor.addAssertion(assertion);
final URI attContext = entityDescriptor.getAttributeContext(att);
if (attContext != null) {
descriptor.setAssertionContext(assertion, attContext);
}
}
private void addForProperties(LoadingParameters<?> loadingParams, EntityType<?> et, AxiomDescriptor descriptor) {
final PropertiesSpecification<?, ?, ?, ?> props = et.getProperties();
if (props != null && shouldLoad(props.getFetchType(), loadingParams.isForceEager())) {
final Assertion propsAssertion = Assertion.createUnspecifiedPropertyAssertion(props.isInferred());
addAssertionToDescriptor(loadingParams.getDescriptor(), props, descriptor, propsAssertion);
}
}
private Assertion createAssertion(Attribute<?, ?> att, Descriptor descriptor) {
assert att != null;
switch (att.getPersistentAttributeType()) {
case OBJECT:
return Assertion.createObjectPropertyAssertion(att.getIRI().toURI(), att.isInferred());
case DATA:
if (withLanguage(descriptor)) {
return Assertion
.createDataPropertyAssertion(att.getIRI().toURI(), language(descriptor), att.isInferred());
} else {
return Assertion
.createDataPropertyAssertion(att.getIRI().toURI(), att.isInferred());
}
case ANNOTATION:
if (withLanguage(descriptor)) {
return Assertion
.createAnnotationPropertyAssertion(att.getIRI().toURI(), language(descriptor),
att.isInferred());
} else {
return Assertion
.createAnnotationPropertyAssertion(att.getIRI().toURI(), att.isInferred());
}
default:
throw new IllegalArgumentException(
"Illegal persistent attribute type " + att.getPersistentAttributeType());
}
}
private boolean withLanguage(Descriptor descriptor) {
return descriptor.hasLanguage() || puLanguage != null;
}
private String language(Descriptor descriptor) {
return descriptor.hasLanguage() ? descriptor.getLanguage() : puLanguage;
}
/**
* Creates an axiom representing a class assertion.
* <p>
* This axiom can be used to load a reference to an individual with the correct type, without any other attributes.
*
* @param identifier Individual identifier
* @param et Entity type. Type IRI is extracted from it
* @return {@code Axiom}
*/
Axiom<NamedResource> createForReferenceLoading(URI identifier, EntityType<?> et) {
return new AxiomImpl<>(NamedResource.create(identifier), Assertion.createClassAssertion(false),
new Value<>(NamedResource.create(et.getIRI().toString())));
}
AxiomDescriptor createForFieldLoading(URI identifier, Field field, Descriptor entityDescriptor, EntityType<?> et) {
final AxiomDescriptor descriptor = new AxiomDescriptor(NamedResource.create(identifier));
FieldSpecification<?, ?> fieldSpec = MappingUtils.getFieldSpecification(field, et);
final Assertion assertion;
if (et.getTypes() != null && fieldSpec.equals(et.getTypes())) {
assertion = Assertion.createClassAssertion(et.getTypes().isInferred());
} else if (et.getProperties() != null && fieldSpec.equals(et.getProperties())) {
assertion = Assertion.createUnspecifiedPropertyAssertion(et.getProperties().isInferred());
} else {
assertion = createAssertion((Attribute<?, ?>) fieldSpec,
entityDescriptor.getAttributeDescriptor(fieldSpec));
}
addAssertionToDescriptor(entityDescriptor, fieldSpec, descriptor, assertion);
return descriptor;
}
}