ObjectField::getGetterTypeHint

public function getGetterTypeHint()
{
	$type = 'mixed';

	if (!empty($this->objectClasses))
	{
		$types =  $this->objectClasses;

		if ($this->is_nullable)
		{
			$types[] = 'null';
		}

		$type =  join('|', $types);
	}

	return $type;
}