currencyexchange.JSONCurrency.java Source code

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Here is the source code for currencyexchange.JSONCurrency.java

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/*
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 */

package currencyexchange;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

/**
 *
 * @author Quan Nguyen
 */
public class JSONCurrency {
    private static final String filePath = "./res/currencyUnits.json";

    public static ArrayList<CurrencyUnit> getCurrencyUnitsJSON() {
        try {
            FileReader reader = new FileReader(filePath);

            JSONParser jsonParser = new JSONParser();
            JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);

            JSONArray currencyUnits = (JSONArray) jsonObject.get("units");

            ArrayList<CurrencyUnit> currencies = new ArrayList<CurrencyUnit>();

            Iterator i = currencyUnits.iterator();
            while (i.hasNext()) {
                JSONObject e = (JSONObject) i.next();
                CurrencyUnit currency = new CurrencyUnit((String) e.get("CountryCurrency"),
                        (String) e.get("Units"));

                currencies.add(currency);
            }
            return currencies;

        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
        } catch (ParseException | NullPointerException ex) {
            ex.printStackTrace();
        }

        return null;
    }
}