         return nil
     }
     
-    private func filePath(key key: String) -> String
+    private func fileURLForKey(key key: String) -> NSURL
     {
         guard let directoryURL = self.documentsDirectoryURL()
         else

    
    func setData(data: NSData, forKey key: String) throws
    {
        let filePath = self.filePath(key: key)
        
        if let documentsDirectoryURL = self.documentsDirectoryURL()
        {

        
        let fileURL = directoryURL.URLByAppendingPathComponent("dontlookatthis-\(key).plist")
        
        return fileURL
    }
}