class ClassMetadataFactory

ClassMetadataFactoryTest.php in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Mapping/ClassMetadataFactoryTest.php

ValidatorBuilder.php in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/ValidatorBuilder.php

class ClassMetadataFactory implements MetadataFactoryInterface {

  /**
   * The loader for loading the class metadata
   * @var LoaderInterface
   */
  protected $loader;

  /**
   * The cache for caching class metadata
   * @var CacheInterface
   */
  protected $cache;
  protected $loadedClasses = array();
  public function __construct(LoaderInterface $loader = null, CacheInterface $cache = null) {
    $this->loader = $loader;
    $this->cache = $cache;
  }

  /**
   * {@inheritdoc}
   */
  public function getMetadataFor($value) {
    if (!is_object($value) && !is_string($value)) {
      throw new NoSuchMetadataException(sprintf('Cannot create metadata for non-objects. Got: %s', gettype($value)));
    }
    $class = ltrim(is_object($value) ? get_class($value) : $value, '\\');
    if (isset($this->loadedClasses[$class])) {
      return $this->loadedClasses[$class];
    }
    if (null !== $this->cache && false !== ($this->loadedClasses[$class] = $this->cache
      ->read($class))) {
      return $this->loadedClasses[$class];
    }
    if (!class_exists($class) && !interface_exists($class)) {
      throw new NoSuchMetadataException(sprintf('The class or interface "%s" does not exist.', $class));
    }
    $metadata = new ClassMetadata($class);

    // Include constraints from the parent class
    if ($parent = $metadata
      ->getReflectionClass()
      ->getParentClass()) {
      $metadata
        ->mergeConstraints($this
        ->getMetadataFor($parent->name));
    }

    // Include constraints from all implemented interfaces
    foreach ($metadata
      ->getReflectionClass()
      ->getInterfaces() as $interface) {
      if ('Symfony\\Component\\Validator\\GroupSequenceProviderInterface' === $interface->name) {
        continue;
      }
      $metadata
        ->mergeConstraints($this
        ->getMetadataFor($interface->name));
    }
    if (null !== $this->loader) {
      $this->loader
        ->loadClassMetadata($metadata);
    }
    if (null !== $this->cache) {
      $this->cache
        ->write($metadata);
    }
    return $this->loadedClasses[$class] = $metadata;
  }

  /**
   * {@inheritdoc}
   */
  public function hasMetadataFor($value) {
    if (!is_object($value) && !is_string($value)) {
      return false;
    }
    $class = ltrim(is_object($value) ? get_class($value) : $value, '\\');
    if (class_exists($class) || interface_exists($class)) {
      return true;
    }
    return false;
  }

}