json - What is the "official" way to handle a file tree in Swift -

i have server returns json of files , directories. structure looks like this:

{    "directory": {       "file": ["2015-04-20t22:20:45+09:00", 130940928],       "subdirectory": {          "another file": ["2015-04-20t22:20:45+09:00", 130940928]       }    },    "rootfile": ["2015-04-20t22:20:45+09:00", 130940928] } 

i'm using alamofire along swiftyjson fetch data, , want convert json swift can manipulate — instance nsoutlineviewdatasource class.

i run 2 problems:

• how 1 loop through kind of json? way loop on (name, content), , if content[1].int non-nil, name file, else, it's folder , need perform new loop on content.
• how 1 represent file hierarchy in swift?

for second point, made simple file class:

    struct file {          var name: string          var path: nsurl     } 

and can define directory array of files. however, file tree more complex can't predict how many levels of nesting array/dictionary need. there cocoa library use?