public function getPscType($dcTypeConstant) {
    if ($dcTypeConstant === NULL) throw new TypeConversionException('dcTypeConstant kann nicht NULL sein');
    
    $flip = array_flip($this->casts);
    
    if (!array_key_exists($dcTypeConstant, $flip)) {
      throw TypeConversionException::typeTarget('Doctrine-Type: '.$dcTypeConstant, 'Psc-Type');
    }
    
    return Type::create($flip[$dcTypeConstant]);
  }