/**
* Get the id of the plan entry which ultimately contains this entry
*/
public static function get_ancestor_entryid(SimpleXMLElement $entry, PluginImportLeap $importer)
{
$entryid = (string) $entry->id;
if (!isset(self::$ancestors[$entryid])) {
self::$ancestors[$entryid] = null;
$child = $entry;
while ($child) {
$childid = (string) $child->id;
if (!isset(self::$parents[$childid])) {
self::$parents[$childid] = null;
foreach ($child->link as $link) {
$href = (string) $link['href'];
if ($href != $entryid && $importer->curie_equals($link['rel'], PluginImportLeap::NS_LEAP, 'is_part_of') && $importer->entry_has_strategy($href, self::STRATEGY_IMPORT_AS_PLAN, 'plans')) {
self::$parents[$childid] = $href;
break;
}
}
}
if (!self::$parents[$childid]) {
break;
}
if ($child = $importer->get_entry_by_id(self::$parents[$childid])) {
self::$ancestors[$entryid] = self::$parents[$childid];
}
}
}
return self::$ancestors[$entryid];
}