private function addMetaDataTag($title)
{
$title = trim($title);
// check to see if the tag already exists
$instance_id = $this->image_set->instance === null ? null : $this->image_set->instance->id;
$sql = sprintf('select * from
PinholeTag where lower(title) = lower(%1$s)
and instance %2$s %3$s', $this->db->quote($title, 'text'), SwatDB::equalityOperator($instance_id), $this->db->quote($instance_id, 'integer'));
$tags = SwatDB::query($this->db, $sql, SwatDBClassMap::get('PinholeTagDataObjectWrapper'));
if (count($tags) > 0) {
$tag_obj = $tags->getFirst();
} else {
$tag_obj = new PinholeTagDataObject();
$tag_obj->setDatabase($this->db);
$tag_obj->setInstance($this->image_set->instance);
$tag_obj->title = $title;
$tag_obj->save();
}
return $tag_obj;
}
