116 lines
3.1 KiB
Java
116 lines
3.1 KiB
Java
package com.dougkeen.bart;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLConnection;
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import java.util.List;
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import org.xml.sax.SAXException;
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import com.dougkeen.bart.data.RealTimeArrivals;
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import android.os.AsyncTask;
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import android.util.Xml;
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public abstract class GetRealTimeArrivalsTask extends
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AsyncTask<GetRealTimeArrivalsTask.Params, Integer, RealTimeArrivals> {
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private static final int CONNECTION_TIMEOUT_MILLIS = 10000;
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private final static String API_KEY = "5LD9-IAYI-TRAT-MHHW";
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private final static String API_URL = "http://api.bart.gov/api/etd.aspx?cmd=etd&key="
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+ API_KEY + "&orig=%1$s&dir=%2$s";
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private final static int MAX_ATTEMPTS = 3;
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private IOException mIOException;
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private List<Route> mRoutes;
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@Override
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protected RealTimeArrivals doInBackground(Params... paramsArray) {
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// Always expect one param
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Params params = paramsArray[0];
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mRoutes = params.origin.getRoutesForDestination(params.destination);
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if (!isCancelled()) {
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return getArrivalsFromNetwork(params, 0);
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} else {
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return null;
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}
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}
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private RealTimeArrivals getArrivalsFromNetwork(Params params,
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int attemptNumber) {
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try {
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URL sourceUrl = new URL(String.format(API_URL,
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params.origin.abbreviation, mRoutes.get(0).getDirection()));
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EtdContentHandler handler = new EtdContentHandler(params.origin,
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params.destination, mRoutes);
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if (isCancelled()) {
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return null;
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}
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URLConnection connection = sourceUrl.openConnection();
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connection.setConnectTimeout(CONNECTION_TIMEOUT_MILLIS);
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Xml.parse(connection.getInputStream(),
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Xml.findEncodingByName("UTF-8"),
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handler);
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final RealTimeArrivals realTimeArrivals = handler
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.getRealTimeArrivals();
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return realTimeArrivals;
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} catch (MalformedURLException e) {
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throw new RuntimeException(e);
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} catch (UnsupportedEncodingException e) {
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throw new RuntimeException(e);
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} catch (IOException e) {
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if (attemptNumber < MAX_ATTEMPTS - 1) {
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try {
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Thread.sleep(5000);
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} catch (InterruptedException interrupt) {
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// Ignore... just go on to next attempt
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}
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return getArrivalsFromNetwork(params, attemptNumber + 1);
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} else {
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mIOException = e;
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return null;
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}
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} catch (SAXException e) {
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throw new RuntimeException(e);
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}
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}
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public static class Params {
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public Params(Station origin, Station destination) {
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super();
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this.origin = origin;
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this.destination = destination;
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}
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private Station origin;
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private Station destination;
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public Station getOrigin() {
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return origin;
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}
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public Station getDestination() {
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return destination;
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}
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}
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@Override
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protected void onPostExecute(RealTimeArrivals result) {
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if (result != null) {
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onResult(result);
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} else {
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onNetworkError(mIOException);
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}
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}
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public abstract void onResult(RealTimeArrivals result);
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public abstract void onNetworkError(IOException e);
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}
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