public function migrateToStorageFormat(PhabricatorFileStorageFormat $format)
{
if (!$this->getID() || !$this->getStorageHandle()) {
throw new Exception(pht("You can not migrate a file which hasn't yet been saved."));
}
$data = $this->loadFileData();
$params = array('name' => $this->getName());
$engine = $this->instantiateStorageEngine();
$old_handle = $this->getStorageHandle();
$properties = $format->newStorageProperties();
$this->setStorageFormat($format->getStorageFormatKey());
$this->setStorageProperties($properties);
list($identifier, $new_handle) = $this->writeToEngine($engine, $data, $params);
$this->setStorageHandle($new_handle);
$this->save();
$this->deleteFileDataIfUnused($engine, $identifier, $old_handle);
return $this;
}
