--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Constraints;
+
+use Symfony\Component\Intl\Intl;
+use Symfony\Component\Validator\Context\ExecutionContextInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+/**
+ * Validates whether a value is a valid language code.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class LanguageValidator extends ConstraintValidator
+{
+ /**
+ * {@inheritdoc}
+ */
+ public function validate($value, Constraint $constraint)
+ {
+ if (!$constraint instanceof Language) {
+ throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Language');
+ }
+
+ if (null === $value || '' === $value) {
+ return;
+ }
+
+ if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
+ throw new UnexpectedTypeException($value, 'string');
+ }
+
+ $value = (string) $value;
+ $languages = Intl::getLanguageBundle()->getLanguageNames();
+
+ if (!isset($languages[$value])) {
+ if ($this->context instanceof ExecutionContextInterface) {
+ $this->context->buildViolation($constraint->message)
+ ->setParameter('{{ value }}', $this->formatValue($value))
+ ->setCode(Language::NO_SUCH_LANGUAGE_ERROR)
+ ->addViolation();
+ } else {
+ $this->buildViolation($constraint->message)
+ ->setParameter('{{ value }}', $this->formatValue($value))
+ ->setCode(Language::NO_SUCH_LANGUAGE_ERROR)
+ ->addViolation();
+ }
+ }
+ }
+}