Parsing JSON With Swift

parsing.swift

//: Playground - noun: a place where people can play

import UIKit
import XCPlayground

var str = "Hello, playground"
///https://developer.apple.com/library/watchos/recipes/Playground_Help/Chapters/AddResource.html
/**
{ "feed":
{
"apps": [
{
"name":"iTenWired",
"price":0,
"developer": "Izotx"
}
]
}
}

*/

let sharedImagePath = XCPlaygroundSharedDataDirectoryURL.path!
//print(sharedImagePath)

//stringByAppendingPathComponent("image.png")
    // get the file path for the file "test.json" in the playground bundle
let filePath = NSBundle.mainBundle().pathForResource("sample", ofType: "json")

// get the contentData
let contentData = NSFileManager.defaultManager().contentsAtPath(filePath!)

func serializeAndParse(){
    do {
        //Serialize it
        let dictionary =  try NSJSONSerialization.JSONObjectWithData(contentData!, options: .MutableContainers) as! NSDictionary
        //parse lazy way
        parseLazyWay(dictionary)
       let data =  betterParsing(dictionary)
        data.apps
    }
    catch let error as NSError {
        print(error)
    }
}

/**Quick and dirty parsing - not recommended in a long run */
func parseLazyWay(dictionary:NSDictionary){
    if let feed = dictionary.objectForKey("feed"){
        feed
    }
    if let feed = dictionary.objectForKey("feed") as? NSDictionary, apps = feed.objectForKey("apps")as? NSArray{
        feed
        apps
        //print name =
        apps[0].objectForKey("name")
        
    }
}

//Better method
func betterParsing(dictionary:NSDictionary)->Data{
   let data = Data()
    if let feed = dictionary.objectForKey("feed"){
        feed
    }
    if let feed = dictionary.objectForKey("feed") as? NSDictionary, apps = feed.objectForKey("apps")as? NSArray{
        
        for appString in apps{
            if let appDict = appString as? NSDictionary{
                data.addApp(appDict)
            }
        }
    }
    return data
}

/**Used by better parsing*/
class Data {
    var apps = [App]()
    
    func addApp(dictionary:NSDictionary){
        apps.append(App(dictionary: dictionary))
    }
}

/*App Enum - listing the keys in app's dictionary */
enum AppEnum:String{
    case developer
    case price
    case name
}

/**Data Structure of the app*/
class App {
    var name = ""
    var price = 0.0
    var developer = "Apple"
    /**Convieniene initializer - pass dictionary to create a new instance of the application */
    init(dictionary:NSDictionary){
        if let developer =  dictionary.objectForKey(AppEnum.developer.rawValue) as? String{
            self.developer = developer
        }
        if let price =  dictionary.objectForKey(AppEnum.price.rawValue) as? Double{
            self.price = price
        }
        if let name =  dictionary.objectForKey(AppEnum.name.rawValue) as? String{
            self.name = name
        }
    }
    
}


serializeAndParse()