package ameba.validation;
import ameba.message.error.ErrorMessage;
import com.google.common.collect.Lists;
import com.google.common.hash.Hashing;
import org.glassfish.jersey.server.validation.ValidationError;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.ElementKind;
import javax.validation.Path;
import javax.ws.rs.core.Response;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
/**
* <p>ValidationHelper class.</p>
*
* @author icode
*
*/
public final class ValidationHelper {
/**
* Prevent instantiation.
*/
private ValidationHelper() {
}
/**
* Extract {@link ConstraintViolation constraint violations} from given exception and transform them into a list of
* {@link ValidationError validation errors}.
*
* @param violation exception containing constraint violations.
* @return list of validation errors (not {@code null}).
*/
public static List<ErrorMessage.Error> constraintViolationToValidationErrors(
final ConstraintViolationException violation) {
return Lists.transform(Lists.newArrayList(violation.getConstraintViolations()),
violation1 -> new ErrorMessage.Error(
Hashing.murmur3_32().hashUnencodedChars(violation1.getMessageTemplate()).toString(),
violation1.getMessage(),
null,
getViolationPath(violation1)
));
}
/**
* Provide a string value of (invalid) value that caused the exception.
*
* @param invalidValue invalid value causing BV exception.
* @return string value of given object or {@code null}.
*/
private static String getViolationInvalidValue(final Object invalidValue) {
if (invalidValue == null) {
return null;
}
if (invalidValue.getClass().isArray()) {
if (invalidValue instanceof Object[]) {
return Arrays.toString((Object[]) invalidValue);
} else if (invalidValue instanceof boolean[]) {
return Arrays.toString((boolean[]) invalidValue);
} else if (invalidValue instanceof byte[]) {
return Arrays.toString((byte[]) invalidValue);
} else if (invalidValue instanceof char[]) {
return Arrays.toString((char[]) invalidValue);
} else if (invalidValue instanceof double[]) {
return Arrays.toString((double[]) invalidValue);
} else if (invalidValue instanceof float[]) {
return Arrays.toString((float[]) invalidValue);
} else if (invalidValue instanceof int[]) {
return Arrays.toString((int[]) invalidValue);
} else if (invalidValue instanceof long[]) {
return Arrays.toString((long[]) invalidValue);
} else if (invalidValue instanceof short[]) {
return Arrays.toString((short[]) invalidValue);
}
}
return invalidValue.toString();
}
/**
* Get a path to a field causing constraint violations.
*
* @param violation constraint violation.
* @return path to a property that caused constraint violations.
*/
private static String getViolationPath(final ConstraintViolation violation) {
final String rootBeanName = violation.getRootBean().getClass().getSimpleName();
final String propertyPath = violation.getPropertyPath().toString();
return rootBeanName + (!"".equals(propertyPath) ? '.' + propertyPath : "");
}
/**
* Determine the response status (400 or 500) from the given BV exception.
*
* @param violation BV exception.
* @return response status (400 or 500).
*/
public static Response.Status getResponseStatus(final ConstraintViolationException violation) {
final Iterator<ConstraintViolation<?>> iterator = violation.getConstraintViolations().iterator();
if (iterator.hasNext()) {
for (final Path.Node node : iterator.next().getPropertyPath()) {
final ElementKind kind = node.getKind();
if (ElementKind.RETURN_VALUE.equals(kind)) {
return Response.Status.INTERNAL_SERVER_ERROR;
}
}
}
return Response.Status.BAD_REQUEST;
}
}