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package dk.thoerup.traininfo.provider;
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import java.io.StringReader;
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import javax.xml.parsers.SAXParser;
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import javax.xml.parsers.SAXParserFactory;
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import org.xml.sax.Attributes;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import org.xml.sax.XMLReader;
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import org.xml.sax.helpers.DefaultHandler;
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import android.util.Log;
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import dk.thoerup.traininfo.DepartureBean;
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import dk.thoerup.traininfo.DepartureEntry;
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import dk.thoerup.traininfo.util.AndroidTimeoutCache;
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import dk.thoerup.traininfo.util.DownloadUtil;
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import dk.thoerup.traininfo.util.XmlUtil;
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public class XmlDepartureProvider implements DepartureProvider {
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final static int CACHE_TIMEOUT = 60*1000;
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AndroidTimeoutCache<String,DepartureBean> departureCache = new AndroidTimeoutCache<String,DepartureBean>(CACHE_TIMEOUT);
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DepartureEntry tempDeparture;
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StringBuilder builder = new StringBuilder(512);
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@Override
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public DepartureBean lookupDepartures(int stationID, boolean arrival) {
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String key = "" + stationID + ":" + arrival;
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DepartureBean departures = departureCache.get(key);
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if (departures == null) {
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departures = lookupDeparturesWorker(stationID, arrival);
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if (departures != null) {
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departureCache.put(key, departures);
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}
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} else {
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Log.i("XmlDepartureProvider", "cache hit !!!");
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}
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return departures;
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}
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private DepartureBean lookupDeparturesWorker(int stationID, boolean arrival) {
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try
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{
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int iArrival = arrival ? 1 : 0;
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String url = XmlUtil.SERVICE_BASE + "/DepartureServlet?format=xml&station=" + stationID + "&arrival=" + iArrival;
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Log.i("xmlurl",url);
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String doc = DownloadUtil.getContentString(url, 45000, "ISO-8859-1");
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InputSource source = new InputSource( new StringReader(doc));
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SAXParserFactory spf = SAXParserFactory.newInstance();
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SAXParser sp = spf.newSAXParser();
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XMLReader xr = sp.getXMLReader();
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DepartureParser departureParser = new DepartureParser();
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xr.setContentHandler(departureParser);
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xr.setErrorHandler(departureParser);
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xr.parse(source);
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return departureParser.getDepartures();
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} catch (Exception e) {
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Log.e("XmlDepartureProvider", "looupFunction", e);
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return null;
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}
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}
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class DepartureParser extends DefaultHandler {
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private DepartureBean departures = new DepartureBean();
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public DepartureBean getDepartures() {
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return departures;
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}
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// this can be called several times fore the same text-node if there are many chardata / lines
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@Override
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public void characters (char ch[], int start, int length)
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{
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builder.append(ch, start, length);
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}
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@Override
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public void startElement (String uri, String name, String qName, Attributes atts)throws SAXException
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{
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if (name.equalsIgnoreCase("train"))
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tempDeparture = new DepartureEntry();
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builder.setLength(0); //reset StringBuilder
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}
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@Override
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public void endElement (String uri, String name, String qName) throws SAXException
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{
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if (name.equals("train")) {
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departures.entries.add( tempDeparture );
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} else if (name.equals("time")) {
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tempDeparture.setTime(builder.toString().trim());
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} else if (name.equals("updated")) {
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tempDeparture.setLastUpdate(builder.toString().trim());
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} else if (name.equals("trainnumber")) {
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tempDeparture.setTrainNumber(builder.toString().trim());
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} else if (name.equals("destination")) {
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tempDeparture.setDestination(builder.toString().trim());
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} else if (name.equals("origin")) {
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tempDeparture.setOrigin(builder.toString().trim());
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} else if (name.equals("location")) {
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tempDeparture.setLocation(builder.toString().trim());
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} else if (name.equals("status")) {
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tempDeparture.setStatus(builder.toString().trim());
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} else if (name.equals("note")) {
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tempDeparture.setNote(builder.toString().trim());
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} else if (name.equals("type")) {
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tempDeparture.setType(builder.toString().trim());
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} else if (name.equals("notification")) {
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departures.notifications.add( builder.toString().trim() );
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}
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}
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}
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}
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