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VariableResultMapper.java
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VariableResultMapper.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.query.mapper;
import cz.cvut.kbss.jopa.exception.SparqlResultMappingException;
import cz.cvut.kbss.jopa.model.annotations.VariableResult;
import cz.cvut.kbss.jopa.sessions.UnitOfWork;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import cz.cvut.kbss.jopa.utils.DatatypeTransformer;
import cz.cvut.kbss.ontodriver.ResultSet;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
/**
* Maps SPARQL query result to target value based on a {@link VariableResult} configuration.
*/
class VariableResultMapper implements SparqlResultMapper {
private final String name;
private final Class<?> targetType;
VariableResultMapper(VariableResult mapping) {
this.name = mapping.name();
this.targetType = mapping.type();
}
String getName() {
return name;
}
Class<?> getTargetType() {
return targetType;
}
/**
* Maps value from the current line of the specified result set according to the {@link VariableResult}
* configuration represented by this instance.
*
* @param resultSet Query result set to read
* @param uow
* @return The mapped value
*/
@Override
public Object map(ResultSet resultSet, UnitOfWorkImpl uow) {
try {
final Object value = resultSet.getObject(name);
if (!void.class.equals(targetType)) {
return DatatypeTransformer.transform(value, targetType);
}
return value;
} catch (OntoDriverException e) {
throw new SparqlResultMappingException(e);
}
}
}