package br.com.caelum.stella.hibernate.validator;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import br.com.caelum.stella.MessageProducer;
import br.com.caelum.stella.SimpleValidationMessage;
import br.com.caelum.stella.ValidationMessage;
import br.com.caelum.stella.validation.InvalidValue;
/**
* Recupera mensagens de validação definida na anotação do Hibernate Validator.
*
* @author Fabio Kung
*/
public class AnnotationMessageProducer implements MessageProducer {
private final Annotation constraint;
public AnnotationMessageProducer(Annotation constraint) {
this.constraint = constraint;
}
/**
* This method will always return the same ValidationMessage, as Hibernate
* Validator only let one message per Validator, defined inside the
* constraint annotation.
*
* @param invalidValue
* will be ignored
* @return the message defined by the related constraint annotation
*/
public ValidationMessage getMessage(InvalidValue invalidValue) {
try {
Method constraintMessage = constraint.annotationType().getMethod("message");
String message = constraintMessage.invoke(constraint).toString();
return new SimpleValidationMessage(message);
} catch (NoSuchMethodException e) {
// same behavior as Hibernate Validator built-in validators
// see
// org.hibernate.validator.interpolator.DefaultMessageInterpolator
throw new IllegalArgumentException("Annotation " + constraint
+ " does not have an (accessible) message attribute");
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}