public function write(RecordInterface $record)
{
if ($record instanceof RssRecord) {
$writer = new Writer($record->getTitle(), $record->getLink(), $record->getDescription());
$this->buildChannel($record, $writer);
foreach ($record as $row) {
$item = $writer->createItem();
$this->buildItem($row, $item);
$item->close();
}
return $writer->toString();
} elseif ($record instanceof Item) {
$writer = new Writer\Item();
$this->buildItem($record, $writer);
return $writer->toString();
} else {
throw new InvalidArgumentException('Record must be an PSX\\Rss or PSX\\Rss\\Item record');
}
}
