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EntityResultMapper.java
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EntityResultMapper.java
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/**
* Copyright (C) 2019 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.query.mapper;
import cz.cvut.kbss.jopa.exception.SparqlResultMappingException;
import cz.cvut.kbss.jopa.model.descriptors.EntityDescriptor;
import cz.cvut.kbss.jopa.model.lifecycle.PostLoadInvoker;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import cz.cvut.kbss.ontodriver.iteration.ResultRow;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Maps result of a SPARQL SELECT query to an entity instance.
*/
class EntityResultMapper<T> implements SparqlResultMapper {
private final EntityType<T> et;
private final List<FieldResultMapper> fieldMappers = new ArrayList<>();
EntityResultMapper(EntityType<T> et) {
this.et = et;
}
void addFieldMapper(FieldResultMapper mapper) {
fieldMappers.add(mapper);
}
List<FieldResultMapper> getFieldMappers() {
return Collections.unmodifiableList(fieldMappers);
}
EntityType<T> getEntityType() {
return et;
}
@Override
public T map(ResultRow resultRow, UnitOfWorkImpl uow) {
try {
final T instance = et.getJavaType().newInstance();
fieldMappers.forEach(m -> m.map(resultRow, instance, uow));
return (T) uow.registerExistingObject(instance, new EntityDescriptor(),
Collections.singletonList(new PostLoadInvoker(uow.getMetamodel())));
} catch (InstantiationException | IllegalAccessException e) {
// This is not expected, since an entity class must have a public no-arg constructor
throw new SparqlResultMappingException(e);
}
}
}