/**
* Returns a cache identification string.
*
* @return string A string to be used as part of keys.
*/
protected function get_cache_identifier()
{
$identifiers = array();
if ($this->selectedsharingoption & self::SHARING_ALL) {
// Nothing to do here.
} else {
if ($this->selectedsharingoption & self::SHARING_SITEID) {
$identifiers[] = cache_helper::get_site_identifier();
}
if ($this->selectedsharingoption & self::SHARING_VERSION) {
$identifiers[] = cache_helper::get_site_version();
}
if ($this->selectedsharingoption & self::SHARING_INPUT && !empty($this->userinputsharingkey)) {
$identifiers[] = $this->userinputsharingkey;
}
}
return join('/', $identifiers);
}