/**
* Converts a DOMElement item to a Zotero_Tag object
*
* @param DOMElement $xml Tag data as DOMElement
* @param int $libraryID Library ID
* @return Zotero_Tag Zotero tag object
*/
public static function convertXMLToTag(DOMElement $xml, &$itemKeysToUpdate)
{
$libraryID = (int) $xml->getAttribute('libraryID');
$tag = self::getByLibraryAndKey($libraryID, $xml->getAttribute('key'));
if (!$tag) {
$tag = new Zotero_Tag();
$tag->libraryID = $libraryID;
$tag->key = $xml->getAttribute('key');
}
$tag->name = $xml->getAttribute('name');
$type = (int) $xml->getAttribute('type');
$tag->type = $type ? $type : 0;
$tag->dateAdded = $xml->getAttribute('dateAdded');
$tag->dateModified = $xml->getAttribute('dateModified');
$dataChanged = $tag->hasChanged();
$itemKeys = $xml->getElementsByTagName('items');
$oldKeys = $tag->getLinkedItems(true);
if ($itemKeys->length) {
$newKeys = explode(' ', $itemKeys->item(0)->nodeValue);
} else {
$newKeys = array();
}
$addKeys = array_diff($newKeys, $oldKeys);
$removeKeys = array_diff($oldKeys, $newKeys);
// If the data has changed, all old and new items need to change
if ($dataChanged) {
$itemKeysToUpdate = array_merge($oldKeys, $addKeys);
} else {
$itemKeysToUpdate = array_merge($addKeys, $removeKeys);
}
$tag->setLinkedItems($newKeys);
return $tag;
}
