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ConstructorResultMapper.java
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ConstructorResultMapper.java
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package cz.cvut.kbss.jopa.query.mapper;
import cz.cvut.kbss.jopa.exception.SparqlResultMappingException;
import cz.cvut.kbss.ontodriver.ResultSet;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Maps SPARQL query result to target value using a constructor configured via a {@link cz.cvut.kbss.jopa.model.annotations.ConstructorResult} configuration.
*/
public class ConstructorResultMapper implements SparqlResultMapper {
private final Class<?> targetType;
private final List<VariableResultMapper> paramMappers = new ArrayList<>();
ConstructorResultMapper(Class<?> targetType) {
this.targetType = targetType;
}
Class<?> getTargetType() {
return targetType;
}
List<VariableResultMapper> getParamMappers() {
return Collections.unmodifiableList(paramMappers);
}
void addParameterMapper(VariableResultMapper mapper) {
paramMappers.add(mapper);
}
@Override
public Object map(ResultSet resultSet) {
final Object[] values = new Object[paramMappers.size()];
final Class<?>[] types = new Class[paramMappers.size()];
for (int i = 0; i < paramMappers.size(); i++) {
values[i] = paramMappers.get(i).map(resultSet);
types[i] = values[i].getClass();
}
try {
final Constructor<?> ctor = targetType.getDeclaredConstructor(types);
if (!ctor.isAccessible()) {
ctor.setAccessible(true);
}
return ctor.newInstance(values);
} catch (NoSuchMethodException e) {
throw new SparqlResultMappingException(
String.format("No matching constructor for values %s found in type %s.", Arrays.toString(values),
targetType), e);
} catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
throw new SparqlResultMappingException(
String.format("Unable to map values %s to type %s.", Arrays.toString(values), targetType), e);
}
}
}