Scala Json Parser Example

JsonParser.scala

import org.json.JSONObject


case class Item(id: String, category: String, soldQuantity: Integer, price: Double, currencyId: String, 
	sellerId: Long, officialStoreId: String, condition: String, acceptMP: Boolean)


object JsonParser {
  def parseSearch(json: String): List[Item] = {
	  try { 
	    // catch exception when the JSONStr is malformed
	      val o = new JSONObject(json)

	      val elems = o.getJSONArray("results")

	      val items = for (idx <- 0 to elems.length() - 1) yield {

	        try { 
	          // catch exception when one of the results doesn't contains all the required fields
	          val elem = elems.getJSONObject(idx)

	          val id = elem.getString("id")
	          val siteId = elem.getString("site_id")
	          val title = elem.getString("title")
	          val sellerId = elem.getJSONObject("seller").getLong("id")
	          val price = elem.getDouble("price")
	          val currencyId = elem.getString("currency_id")
	          val availableQuantity = elem.getInt("available_quantity")
	          val soldQuantity = elem.getInt("sold_quantity")
	          val buyingMode = elem.getString("buying_mode")
	          val listingType = elem.getString("listing_type_id")
	          val stopTime = elem.getString("stop_time")
	          val condition = elem.getString("condition")
	          val permalink = elem.getString("permalink")
	          val thumbnail = elem.getString("thumbnail")
	          val acceptsMercadoPago = elem.getBoolean("accepts_mercadopago")
	          val officialStoreId = elem.getString("official_store_id")
	          val categoryId = elem.getString("category_id")

	          Some(Item(id, categoryId, soldQuantity, price, currencyId, sellerId, officialStoreId, condition, acceptsMercadoPago))

	        } catch {
	          case e: Exception => {
	            e.printStackTrace()
	            None
	          }
	        }

	      }
	      items.flatMap(e => e).toList
	  	
	  } catch {
          case e: Exception => {
            e.printStackTrace()
		  	List[Item]()
		}
	  }
  }
}