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package dk.thoerup.traininfoservice.banedk;
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import java.sql.Connection;
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import java.sql.ResultSet;
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import java.sql.Statement;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.logging.Logger;
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import com.gargoylesoftware.htmlunit.WebClient;
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import com.gargoylesoftware.htmlunit.html.DomNodeList;
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import com.gargoylesoftware.htmlunit.html.HtmlElement;
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import com.gargoylesoftware.htmlunit.html.HtmlPage;
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import dk.thoerup.curcuitbreaker.CircuitBreaker;
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import dk.thoerup.curcuitbreaker.CircuitBreakerManager;
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import dk.thoerup.traininfoservice.DBConnection;
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public class DepartureFetcher {
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Logger logger = Logger.getLogger(DepartureFetcher.class.getName());
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TimeoutCache<Integer, List<DepartureBean>> cache = new TimeoutCache<Integer,List<DepartureBean>>(120 * 1000);
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public List<DepartureBean> cachedLookupDepartures(int stationID) throws Throwable {
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List<DepartureBean> list = cache.get(stationID);
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if (list == null) {
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list = lookupDepartures(stationID);
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cache.put(stationID, list);
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} else {
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logger.info("Departure: Cache hit " + stationID); //remove before production
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}
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return list;
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}
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public List<DepartureBean> lookupDepartures(int stationID) throws Throwable {
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List<DepartureBean> departureList = new ArrayList<DepartureBean>();
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Connection conn = null;
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try
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{
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conn = DBConnection.getConnection();
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String SQL = "SELECT stationcode_fjrn, stationcode_stog FROM trainstations WHERE id=" + stationID;
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Statement stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery(SQL);
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if (rs.next()) {
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String code = rs.getString( 1 );
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if (! rs.wasNull() ) {
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List<DepartureBean> list = lookupDepartures(code, "FJRN");
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departureList.addAll(list);
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}
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code = rs.getString(2);
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if (! rs.wasNull() ) {
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List<DepartureBean> list = lookupDepartures(code, "S2");
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departureList.addAll(list);
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}
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Collections.sort( departureList );
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}
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} finally {
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if (conn != null && !conn.isClosed() ) {
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conn.close();
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}
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}
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return departureList;
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}
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public List<DepartureBean> lookupDepartures(String stationcode, String type) throws Throwable {
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List<DepartureBean> departureList = new ArrayList<DepartureBean>();
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final WebClient webClient = new WebClient();
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webClient.setTimeout(2500);
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webClient.setJavaScriptEnabled(false);
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String uri = "http://www.bane.dk/visStation.asp?ArtikelID=4275&W=" + type + "&S=" + stationcode;
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BanedkInvocation wrapper = new BanedkInvocation(webClient, uri);
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CircuitBreaker breaker = CircuitBreakerManager.getManager().getCircuitBreaker("banedk");
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HtmlPage page = (HtmlPage) breaker.invoke(wrapper);
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HtmlElement table = page.getElementById("afgangtabel");
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if (table != null) {
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DomNodeList<HtmlElement> tableRows = table.getElementsByTagName("tr");
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for (HtmlElement currentRow : tableRows) {
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String rowClass = currentRow.getAttribute("class");
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if (rowClass != null && rowClass.toLowerCase().contains("station") ) {
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DomNodeList<HtmlElement> fields = currentRow.getElementsByTagName("td");
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DepartureBean departure = new DepartureBean();
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String time = fields.get(0).asText();
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if (time.equals(""))
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time = "0:00"; //Bane.dk bug work-around
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departure.setTime(time);
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int updated = extractUpdated( fields.get(1) );
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departure.setUpdated(updated);
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String trainNumber = fields.get(2).asText();
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if (type.equalsIgnoreCase("S2")) //If it is S-train we need to extract the trainNumber
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trainNumber = trainNumber + " " + extractTrainNumber(fields.get(2));
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departure.setTrainNumber(trainNumber);
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String destination = fields.get(3).asText();
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departure.setDestination(destination);
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String origin = fields.get(4).asText();
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departure.setOrigin(origin);
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String location = fields.get(5).asText();
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departure.setLocation(location);
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String status = fields.get(6).asText();
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departure.setStatus(status);
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String note = extractNote( fields.get(7) );
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departure.setNote(note);
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departureList.add(departure);
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}
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}
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} else {
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logger.warning("No departures found for station=" + stationcode + ", type=" + type);
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}
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return departureList;
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}
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private int extractUpdated(HtmlElement updatedTd) { //extract the digit (in this case: 4) from "media/trafikinfo/opdater4.gif"
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int updated = -1;
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DomNodeList<HtmlElement> updatedImgs = updatedTd.getElementsByTagName("img");
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String updatedStr = updatedImgs.get(0).getAttribute("src");
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if (updatedStr != null) {
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for (int i=0; i<updatedStr.length(); i++) {
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char c = updatedStr.charAt(i);
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if ( Character.isDigit(c)) {
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updated = Character.digit(c, 10);
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break;
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}
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}
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}
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return updated;
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}
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private String extractNote(HtmlElement noteTd) {
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String note = noteTd.asText().trim();
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List<HtmlElement> elems = noteTd.getElementsByAttribute("span", "class", "bemtype");
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if (elems.size() > 0 && note.charAt(note.length()-1) == 'i')
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note = note.substring(0,note.length() -1 );
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return note;
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}
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private String extractTrainNumber(HtmlElement trainTd) {
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String number = "";
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HtmlElement anchorElement = trainTd.getElementsByTagName("a").get(0);
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String href = anchorElement.getAttribute("href");
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String argstring = href.substring( href.indexOf('?') + 1);
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String args[] = argstring.split("&");
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for (String arg : args) {
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String pair[] = arg.split("="); // Key=pair[0], Value=pair[1]
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if (pair[0].equalsIgnoreCase("TogNr"))
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number = pair[1];
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}
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return number;
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}
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//test
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public static void main(String args[]) throws Throwable {
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DepartureFetcher f = new DepartureFetcher();
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List<DepartureBean> deps = f.lookupDepartures("AR", "FJRN");
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for(DepartureBean d : deps) {
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System.out.println( d.getTime() + ";" + d.getUpdated() + ";" + d.getTrainNumber() + ";" +
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d.getDestination() + ";" + d.getOrigin() + ";" + d.getLocation() + ";" + d.getStatus() + ";" + d.getNote() );
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}
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System.out.println("--------------------------");
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}
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}
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