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TwoStepInstanceLoader.java
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TwoStepInstanceLoader.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.oom;
import cz.cvut.kbss.jopa.exceptions.StorageAccessException;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.metamodel.EntityTypeImpl;
import cz.cvut.kbss.jopa.oom.exceptions.EntityReconstructionException;
import cz.cvut.kbss.jopa.oom.metamodel.PolymorphicEntityTypeResolver;
import cz.cvut.kbss.jopa.sessions.LoadingParameters;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.model.Axiom;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import java.net.URI;
import java.util.Collections;
import java.util.Set;
class TwoStepInstanceLoader extends EntityInstanceLoader {
private TwoStepInstanceLoader(TwoStepInstanceLoaderBuilder builder) {
super(builder);
}
@Override
<T> T loadEntity(LoadingParameters<T> loadingParameters) {
final EntityTypeImpl<T> rootEt = metamodel.entity(loadingParameters.getEntityType());
try {
final EntityType<? extends T> et = resolveEntityType(loadingParameters, rootEt);
if (et == null) {
return null;
}
return loadInstance(loadingParameters, et);
} catch (OntoDriverException e) {
throw new StorageAccessException(e);
}
}
@Override
<T> T loadReference(LoadingParameters<T> loadingParameters) {
final EntityTypeImpl<T> rootEt = metamodel.entity(loadingParameters.getEntityType());
try {
final EntityType<? extends T> et = resolveEntityType(loadingParameters, rootEt);
return et != null ? entityBuilder.createEntityInstance(loadingParameters.getIdentifier(), et) : null;
} catch (OntoDriverException e) {
throw new StorageAccessException(e);
} catch (IllegalAccessException | InstantiationException e) {
throw new EntityReconstructionException(e);
}
}
private <T> EntityType<? extends T> resolveEntityType(LoadingParameters<T> loadingParameters,
EntityTypeImpl<T> rootEt) throws OntoDriverException {
NamedResource individual = NamedResource.create(loadingParameters.getIdentifier());
final URI ctx = loadingParameters.getDescriptor().getContext();
final Set<Axiom<URI>> types = storageConnection.types().getTypes(individual,
ctx != null ? Collections.singleton(ctx) : Collections.emptySet(), false);
return new PolymorphicEntityTypeResolver<>(individual, rootEt, types).determineActualEntityType();
}
static TwoStepInstanceLoaderBuilder builder() {
return new TwoStepInstanceLoaderBuilder();
}
static class TwoStepInstanceLoaderBuilder extends EntityInstanceLoaderBuilder {
@Override
EntityInstanceLoader build() {
return new TwoStepInstanceLoader(this);
}
}
}