class EasyRdf_Serialiser_Arc

class EasyRdf_Serialiser_Arc extends EasyRdf_Serialiser_RdfPhp {
  private static $supportedTypes = array(
    'rdfxml' => 'RDFXML',
    'turtle' => 'Turtle',
    'ntriples' => 'NTriples',
    'posh' => 'POSHRDF',
  );

  /**
   * Constructor
   *
   * @return object EasyRdf_Serialiser_Arc
   */
  public function __construct() {
    require_once 'arc/ARC2.php';
  }

  /**
   * Serialise an EasyRdf_Graph into RDF format of choice.
   *
   * @param object EasyRdf_Graph $graph   An EasyRdf_Graph object.
   * @param string               $format  The name of the format to convert to.
   * @return string              The RDF in the new desired format.
   */
  public function serialise($graph, $format) {
    parent::checkSerialiseParams($graph, $format);
    if (array_key_exists($format, self::$supportedTypes)) {
      $className = self::$supportedTypes[$format];
    }
    else {
      throw new EasyRdf_Exception("EasyRdf_Serialiser_Arc does not support: {$format}");
    }
    $serialiser = ARC2::getSer($className);
    if ($serialiser) {
      return $serialiser
        ->getSerializedIndex(parent::serialise($graph, 'php'));
    }
    else {
      throw new EasyRdf_Exception("ARC2 failed to get a {$className} serialiser.");
    }
  }

}