Class in charge of the connections management with AutomaticAPIREST

AARManager.java

/**
 * Class in charge of the connections management with AutomaticAPIREST
 * Created by Miguel Catalan Bañuls on 29/07/14. @mcatalanb
 */
public class AARManager {

    public static final String USER_AGENT = "Mozilla/5.0";

    private String URL;
    private String user_agent;

    /**
     * Default constructor
     *
     * @param url location of the resource
     */
    public AARManager(String url) {
        this.URL = url;
        this.user_agent = USER_AGENT;
    }

    /**
     * Optional constructor, can set a different User Agent
     *
     * @param url        location of the resource
     * @param user_agent user agent to be used by the HttpURLConnection
     */
    public AARManager(String url, String user_agent) {
        this.URL = url;
        this.user_agent = user_agent;
    }

    /**
     * Gets the raw data from the resource
     *
     * @return raw json string
     */
    public String getRawResource() throws JSONException, IOException, NetworkErrorException {
        return downloadData(URL, user_agent);
    }

    /**
     * Gets the useful stuff from the data tag
     *
     * @return String with the raw data ready to use
     * @throws IOException
     * @throws JSONException
     */
    public String getJsonData() throws JSONException, IOException, NetworkErrorException {

        String response = downloadData(URL, user_agent);
        JSONObject jsonObject = new JSONObject(response);
        String strData = jsonObject.getString("data"); //we only get the data from the label data, so clever.

        if (strData != null) {
            return strData;
        } else {
            throw new NullPointerException("There is no info");
        }

    }

    /**
     * Connects to the url given and gets the raw data
     *
     * @param url  location of the resource
     * @param user user agent to be used by the HttpURLConnection
     * @return raw json string
     * @throws IOException
     * @throws JSONException
     * @throws NetworkErrorException
     */
    private String downloadData(String url, String user) throws IOException, JSONException, NetworkErrorException {
        if (BaseApplication.isOnline()) {
            HttpURLConnection con;
            BufferedReader in;
            StringBuffer response;

            URL obj = new URL(url);
            con = (HttpURLConnection) obj.openConnection();
            con.setRequestMethod("GET");
            con.setRequestProperty("User-Agent", user);

            if (con.getResponseCode() == HttpURLConnection.HTTP_OK) {

                in = new BufferedReader(
                        new InputStreamReader(con.getInputStream()));
                String inputLine;
                response = new StringBuffer();
                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();
                return response.toString();

            } else {
                throw new HttpResponseException(HttpURLConnection.HTTP_UNAVAILABLE, "Can't get the response");
            }
        } else {
            throw new NetworkErrorException();
        }
    }
}