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EntityResultMapper.java
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EntityResultMapper.java
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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.metamodel.EntityType;
import cz.cvut.kbss.jopa.sessions.UnitOfWork;
import cz.cvut.kbss.ontodriver.ResultSet;
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(ResultSet resultSet, UnitOfWork uow) {
try {
final T instance = et.getJavaType().newInstance();
fieldMappers.forEach(m -> m.map(resultSet, instance, uow));
return (T) uow.registerExistingObject(instance, new EntityDescriptor());
} catch (InstantiationException | IllegalAccessException e) {
// This is not expected, since an entity class must have a public no-arg constructor
throw new SparqlResultMappingException(e);
}
}
}