Split getFolderContentById

lib/private/files/cache/cache.php

@@ -169,6 +169,16 @@ class Cache {
 		if (is_null($fileId)) {
 			$fileId = $this->getId($folder);
 		}
+		return $this->getFolderContentsById($fileId);
+	}
+
+	/**
+	 * get the metadata of all files stored in $folder
+	 *
+	 * @param int $fileId the file id of the folder
+	 * @return array
+	 */
+	public function getFolderContentsById($fileId) {
 		if ($fileId > -1) {
 			$sql = 'SELECT `fileid`, `storage`, `path`, `parent`, `name`, `mimetype`, `mimepart`, `size`, `mtime`,
 						   `storage_mtime`, `encrypted`, `unencrypted_size`, `etag`