abstract class AbstractLoader

abstract class AbstractLoader implements LoaderInterface {

  /**
   * Contains all known namespaces indexed by their prefix
   * @var array
   */
  protected $namespaces;

  /**
   * Adds a namespace alias.
   *
   * @param string $alias     The alias
   * @param string $namespace The PHP namespace
   */
  protected function addNamespaceAlias($alias, $namespace) {
    $this->namespaces[$alias] = $namespace;
  }

  /**
   * Creates a new constraint instance for the given constraint name.
   *
   * @param string $name The constraint name. Either a constraint relative
   *                        to the default constraint namespace, or a fully
   *                        qualified class name
   * @param array $options The constraint options
   *
   * @return Constraint
   *
   * @throws MappingException If the namespace prefix is undefined
   */
  protected function newConstraint($name, $options) {
    if (strpos($name, '\\') !== false && class_exists($name)) {
      $className = (string) $name;
    }
    elseif (strpos($name, ':') !== false) {
      list($prefix, $className) = explode(':', $name, 2);
      if (!isset($this->namespaces[$prefix])) {
        throw new MappingException(sprintf('Undefined namespace prefix "%s"', $prefix));
      }
      $className = $this->namespaces[$prefix] . $className;
    }
    else {
      $className = 'Symfony\\Component\\Validator\\Constraints\\' . $name;
    }
    return new $className($options);
  }

}