Parsing a JSON file in the App Bundle

JSONParsingService.swift

//  AppleStockService.swift
//  PeopleStocks
//
//  Created by Alex Paul on 12/5/18.
//  Copyright © 2018 Alex Paul. All rights reserved.
//

import Foundation

public enum AppleServiceError: Error {
  case resourcePathDoesNotExist
  case contentsNotFound
  case decodingError(Error)
}

final class AppleStockService {
  public static func fetchStocks() throws -> [StockPrice] {
    guard let path = Bundle.main.path(forResource: "appleStockInfo", ofType: "json") else {
      throw AppleServiceError.resourcePathDoesNotExist
    }
    guard let json = FileManager.default.contents(atPath: path) else {
      throw AppleServiceError.contentsNotFound
    }
    do {
      let stocks = try JSONDecoder().decode([StockPrice].self, from: json)
      return stocks
    } catch {
      throw AppleServiceError.decodingError(error)
    }
  }
}