owncloud / core

	) {

		foreach(['id', 'name'] as $property) {

			$$property = trim($$property);

			if(empty($$property) || !is_string($$property)) {

				throw new \InvalidArgumentException('"' . $property . '" parameter must be non-empty string');

			}

		}

		$this->id = $id;

		$this->name = $name;

	 * @throws \InvalidArgumentException

	 */

	protected function checkRoleParameters($role, $type, $id) {

		if (!is_string($type) || empty($type) ||

		    !is_string($id) || ($id === '')

		) {

			throw new \InvalidArgumentException($role . ' parameters must be a non-blank string');

		}

	}

	/**