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VariableResultMapper.java
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VariableResultMapper.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.annotations.VariableResult;
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.
*/
public 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
* @return The mapped value
*/
@Override
public Object map(ResultSet resultSet) {
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);
}
}
}