/**
* Set contents of a file object.
*
* @param AbstractFile $file
* @param string $contents
*
* @throws \Exception|\RuntimeException
* @throws Exception\InsufficientFileWritePermissionsException
* @throws Exception\InsufficientUserPermissionsException
* @return int The number of bytes written to the file
*/
public function setFileContents(AbstractFile $file, $contents)
{
// Check if user is allowed to edit
$this->assureFileWritePermissions($file);
// Call driver method to update the file and update file index entry afterwards
$result = $this->driver->setFileContents($file->getIdentifier(), $contents);
$this->getIndexer()->updateIndexEntry($file);
$this->emitPostFileSetContentsSignal($file, $contents);
return $result;
}