/**
  * This function sets the output ressource. The following elements are possible.
  * <ul>
  *   <li>SCREEN</li>
  * </ul>
  *
  * @param String output The resource to output.
  */
 public static function setOutput($out)
 {
     if (!InputValidator::isOutputRessource($out)) {
         return;
     }
     self::$OUT = $out;
 }
 /**
  * This function sets the output file.
  *
  * @author David Pauli <*****@*****.**>
  * @param String $filename The filename of the new output file with path on the server.
  * @since 0.1.2
  */
 public static function setOutputFile($filename)
 {
     if (InputValidator::isEmpty($filename)) {
         return;
     }
     self::$OUTPUT_FILE = $filename;
 }