/**
* Retrieve the cached list data.
*
* @return mixed The data of the object.
*/
private function _load()
{
if ($this->_data === false) {
$this->_data = unserialize($this->_cache->loadList($this->getListId()));
if (!is_array($this->_data) || !isset($this->_data[self::SYNC]) || !isset($this->_data[self::VERSION]) || $this->_data[self::VERSION] != self::FORMAT_VERSION) {
$this->_data = array();
}
}
}