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JOPAPersistenceProvider.java
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JOPAPersistenceProvider.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.model;
import cz.cvut.kbss.jopa.exceptions.OWLInferredAttributeModifiedException;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.sessions.CloneBuilderImpl;
import cz.cvut.kbss.jopa.sessions.ServerSession;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import java.lang.reflect.Field;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class JOPAPersistenceProvider implements PersistenceProvider, ProviderUtil {
private static Set<EntityManagerFactoryImpl> emfs = new HashSet<>();
@Override
public EntityManagerFactoryImpl createEntityManagerFactory(String emName, Map<String, String> properties) {
final EntityManagerFactoryImpl emf = new EntityManagerFactoryImpl(properties);
emfs.add(emf);
return emf;
}
@Override
public ProviderUtil getProviderUtil() {
return this;
}
@Override
public LoadState isLoaded(Object entity) {
return LoadState.UNKNOWN;
}
@Override
public LoadState isLoadedWithReference(Object entity, String attributeName) {
return LoadState.UNKNOWN;
}
@Override
public LoadState isLoadedWithoutReference(Object entity, String attributeName) {
return LoadState.UNKNOWN;
}
private static UnitOfWorkImpl getPersistenceContext(Object entity) {
if (entity == null) {
return null;
}
for (EntityManagerFactoryImpl emf : emfs) {
final ServerSession session = emf.getServerSession();
if (session == null) {
continue;
}
final UnitOfWorkImpl uow = session.getPersistenceContext(entity);
if (uow != null) {
return uow;
}
}
return null;
}
static void loadReference(Object o, Field f) throws IllegalAccessException {
final UnitOfWorkImpl uow = getPersistenceContext(o);
if (uow != null) {
Object managedOrig = uow.getOriginal(o);
if (managedOrig == null) {
return;
}
Object val = EntityPropertiesUtils.getFieldValue(f, managedOrig);
if (val != null) {
return;
}
uow.loadEntityField(o, f);
}
}
/**
* Write changes to the specified entity to the transaction ontology.
*
* @param entity Entity to persist
*/
static void persistEntityChanges(Object entity, Field f) {
final UnitOfWorkImpl uow = getPersistenceContext(entity);
if (uow != null && uow.isInTransaction()) {
uow.attributeChanged(entity, f);
}
}
static void verifyInferredAttributeNotModified(Object entity, Field field) {
if (getPersistenceContext(entity) == null) {
return;
}
if (CloneBuilderImpl.isFieldInferred(field)) {
throw new OWLInferredAttributeModifiedException("Modifying inferred attributes is forbidden.");
}
}
/**
* Gets field matching the specified name, declared in the specified managed entity or any of its managed supertypes.
* <p>
* The entity has to be managed in one of the currently open persistence contexts.
*
* @param entity Entity instance
* @param fieldName Name of the field to get
* @return Matching field or {@code null}, if the entity is not managed or if no field with the specified name exists in the entity
*/
static Field getEntityField(Object entity, String fieldName) {
final UnitOfWorkImpl uow = getPersistenceContext(entity);
if (uow == null) {
return null;
}
final EntityType<?> et = uow.getMetamodel().entity(entity.getClass());
assert et != null; // If the instance is managed, it has to be an existing entity type
final FieldSpecification<?, ?> fieldSpec = et.getFieldSpecification(fieldName);
return fieldSpec != null ? fieldSpec.getJavaField() : null;
}
}