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SingularQueryAttributeStrategy.java
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SingularQueryAttributeStrategy.java
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/**
* Copyright (C) 2022 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.query;
import cz.cvut.kbss.jopa.exceptions.NoResultException;
import cz.cvut.kbss.jopa.exceptions.NoUniqueResultException;
import cz.cvut.kbss.jopa.model.metamodel.AbstractQueryAttribute;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.query.TypedQuery;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SingularQueryAttributeStrategy<X> extends QueryFieldStrategy<AbstractQueryAttribute<? super X, ?>, X> {
private static final Logger LOG = LoggerFactory.getLogger(SingularQueryAttributeStrategy.class);
private Object value;
public SingularQueryAttributeStrategy(EntityType<X> et, AbstractQueryAttribute<? super X, ?> attribute) {
super(et, attribute);
}
@Override
public void addValueFromTypedQuery(TypedQuery<?> typedQuery) {
Object querySingleResult;
try {
querySingleResult = typedQuery.getSingleResult();
} catch (NoResultException e1) {
LOG.trace("Query \"{}\" for attribute {} did not return any result.", attribute.getQuery(), attribute);
return;
} catch (NoUniqueResultException e2) {
LOG.warn("Query \"{}\" for attribute {} does not have a unique result.", attribute.getQuery(), attribute);
return;
}
if (!isValidRange(querySingleResult)) {
return;
}
this.value = toAttributeValue(querySingleResult);
}
@Override
public void buildInstanceFieldValue(Object instance) {
setValueOnInstance(instance, value);
}
}