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FieldResultMapper.java
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FieldResultMapper.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.FieldResult;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.sessions.UnitOfWork;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import cz.cvut.kbss.ontodriver.ResultSet;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
class FieldResultMapper {
private final String variableName;
private final FieldSpecification<?, ?> fieldSpec;
FieldResultMapper(FieldResult fieldResult, FieldSpecification<?, ?> fieldSpec) {
this.variableName = fieldResult.variable();
this.fieldSpec = fieldSpec;
}
/**
* Creates mappers for which no explicit {@link FieldResult} configuration exists.
* <p>
* Variable name is taken to be the same as the name of the field.
*/
FieldResultMapper(FieldSpecification<?, ?> fieldSpec) {
this.fieldSpec = fieldSpec;
this.variableName = fieldSpec.getName();
}
String getVariableName() {
return variableName;
}
FieldSpecification<?, ?> getFieldSpecification() {
return fieldSpec;
}
/**
* Maps value from the specified result set to the specified target object's field based on the mapping represented
* by this instance.
*
* @param resultSet Result set with value to map
* @param target Target object on which the field will be set
*/
void map(ResultSet resultSet, Object target, UnitOfWork uow) {
try {
final Object value = resultSet.getObject(variableName);
// TODO What about plural attributes?
verifyValueRange(value);
// This does currently only literal values, no references
EntityPropertiesUtils.setFieldValue(fieldSpec.getJavaField(), target, value);
} catch (OntoDriverException e) {
throw new SparqlResultMappingException(e);
}
}
private void verifyValueRange(Object value) {
if (!fieldSpec.getJavaType().isAssignableFrom(value.getClass())) {
throw new SparqlResultMappingException(
String.format("Value %s cannot be assigned to field of type %s.", value, fieldSpec.getJavaType()));
}
}
}