traininfoservice/banedk/DepartureFetcher.java

package dk.thoerup.traininfoservice.banedk;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.logging.Logger;


import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.DomNodeList;
import com.gargoylesoftware.htmlunit.html.HtmlElement;
import com.gargoylesoftware.htmlunit.html.HtmlPage;

import dk.thoerup.traininfoservice.DBConnection;

public class DepartureFetcher {
        
        Logger logger = Logger.getLogger(DepartureFetcher.class.getName());
        
        TimeoutCache<Integer, List<DepartureBean>> cache = new TimeoutCache<Integer,List<DepartureBean>>(120 * 1000);
        
                
        public List<DepartureBean> cachedLookupDepartures(int stationID) throws Exception {

                List<DepartureBean> list = cache.get(stationID);
                
                if (list == null) {
                        list = lookupDepartures(stationID);
                        cache.put(stationID, list);
                } else {
                        logger.info("Departure: Cache hit " + stationID); //remove before production
                }
                return list;
        }
                

        public List<DepartureBean> lookupDepartures(int stationID) throws Exception {
                List<DepartureBean> departureList = new ArrayList<DepartureBean>();
                
                Connection conn = null;
                try 
                {
                        conn = DBConnection.getConnection();
                
                        String SQL = "SELECT stationcode_fjrn, stationcode_stog FROM trainstations WHERE id=" + stationID;
                        Statement stmt = conn.createStatement();
                        ResultSet rs = stmt.executeQuery(SQL);
                        
                        if (rs.next()) {
                                String code = rs.getString( 1 );
                                if (! rs.wasNull() ) {
                                        List<DepartureBean> list = lookupDepartures(code, "FJRN");
                                        departureList.addAll(list);
                                }
                                
                                code = rs.getString(2);
                                if (! rs.wasNull() ) {
                                        List<DepartureBean> list = lookupDepartures(code, "S2");
                                        departureList.addAll(list);     
                                }
                                Collections.sort( departureList );
                        
                        }
                        
                } finally {
                        if (conn != null && !conn.isClosed() ) {
                                conn.close();
                        }
                }
                
                return departureList;
        }
        
        public List<DepartureBean> lookupDepartures(String stationcode, String type) throws Exception {
                
                List<DepartureBean> departureList = new ArrayList<DepartureBean>();
                
            final WebClient webClient = new WebClient();
            webClient.setTimeout(2500);
            webClient.setJavaScriptEnabled(false);
                            
            
            final HtmlPage page = webClient.getPage("http://www.bane.dk/visStation.asp?ArtikelID=4275&W=" + type + "&S=" + stationcode);
            
            HtmlElement table = page.getElementById("afgangtabel");
            
            if (table != null) {
                    DomNodeList<HtmlElement> tableRows =  table.getElementsByTagName("tr");
                    
                    for (HtmlElement currentRow : tableRows) {
                        String rowClass = currentRow.getAttribute("class");
                        if (rowClass != null && rowClass.toLowerCase().contains("station") ) {
                                DomNodeList<HtmlElement> fields = currentRow.getElementsByTagName("td");
        
                                DepartureBean departure = new DepartureBean();
                                
                                String time = fields.get(0).asText();
                                if (time.equals(""))
                                        time = "0:00"; //Bane.dk bug work-around
                                departure.setTime(time);
                                
                                int updated = extractUpdated( fields.get(1) );
                                departure.setUpdated(updated);
                                
                                String trainNumber = fields.get(2).asText();
                                if (trainNumber.trim().length() == 1)
                                        trainNumber = trainNumber + " " + extractTrainNumber(fields.get(2));
                                departure.setTrainNumber(trainNumber);
                                
                                String destination = fields.get(3).asText();
                                departure.setDestination(destination);
                                
                                String origin = fields.get(4).asText();
                                departure.setOrigin(origin);
                                
                                String location = fields.get(5).asText();
                                departure.setLocation(location);
                                
                                String status = fields.get(6).asText();
                                departure.setStatus(status);
                                
                                String note = extractNote( fields.get(7) );
                                departure.setNote(note);
                                
                                departureList.add(departure);
                        }
                    }
            } else {
                logger.warning("No departures found for station=" + stationcode + ", type=" + type);
            }
            
            return departureList;
        }
        
        private int extractUpdated(HtmlElement updatedTd) { //extract the digit (in this case: 4) from "media/trafikinfo/opdater4.gif" 
                int updated = -1;
                
                DomNodeList<HtmlElement> updatedImgs = updatedTd.getElementsByTagName("img");
                String updatedStr = updatedImgs.get(0).getAttribute("src");
                
                if (updatedStr != null) {
                        for (int i=0; i<updatedStr.length(); i++) {
                                char c = updatedStr.charAt(i);
                                if ( Character.isDigit(c))  {
                                        updated = Character.digit(c, 10);
                                        break;
                                }
                        }
                }               
                return updated;
        }
        
        private String extractNote(HtmlElement noteTd) {
                String note = noteTd.asText().trim();
                
                List<HtmlElement> elems = noteTd.getElementsByAttribute("span", "class", "bemtype");
                if (elems.size() > 0 && note.charAt(note.length()-1) == 'i')
                        note = note.substring(0,note.length() -1 );

                return note;
        }
        
        private String extractTrainNumber(HtmlElement trainTd) {
                String number = "";
                HtmlElement anchorElement = trainTd.getElementsByTagName("a").get(0);
                String href = anchorElement.getAttribute("href");
                String argstring = href.substring( href.indexOf('?') + 1);
                
                String args[] = argstring.split("&");
                for (String arg : args) {
                        String pair[] = arg.split("="); // Key=pair[0], Value=pair[1]
                        
                        if (pair[0].equalsIgnoreCase("TogNr"))
                                number = pair[1];
                }
                
                
                return number;
        }
        
        //test
        public static void main(String args[]) throws Exception{
                DepartureFetcher f = new DepartureFetcher();
                List<DepartureBean> deps = f.lookupDepartures("AR", "FJRN");
                for(DepartureBean d : deps) {
                        System.out.println( d.getTime() + ";" + d.getUpdated() + ";" + d.getTrainNumber() + ";" + 
                                                d.getDestination() + ";" + d.getOrigin() + ";" + d.getLocation() + ";" + d.getStatus() + ";" + d.getNote()   );
                }
                
                System.out.println("--------------------------");
        }
}
1	package dk.thoerup.traininfoservice.banedk;
2
3	import java.sql.Connection;
4	import java.sql.ResultSet;
5	import java.sql.Statement;
6	import java.util.ArrayList;
7	import java.util.Collections;
8	import java.util.List;
9	import java.util.logging.Logger;
10
11
12	import com.gargoylesoftware.htmlunit.WebClient;
13	import com.gargoylesoftware.htmlunit.html.DomNodeList;
14	import com.gargoylesoftware.htmlunit.html.HtmlElement;
15	import com.gargoylesoftware.htmlunit.html.HtmlPage;
16
17	import dk.thoerup.traininfoservice.DBConnection;
18
19	public class DepartureFetcher {
20
21	Logger logger = Logger.getLogger(DepartureFetcher.class.getName());
22
23	TimeoutCache<Integer, List<DepartureBean>> cache = new TimeoutCache<Integer,List<DepartureBean>>(120 * 1000);
24
25
26
27	public List<DepartureBean> cachedLookupDepartures(int stationID) throws Exception {
28
29	List<DepartureBean> list = cache.get(stationID);
30
31	if (list == null) {
32	list = lookupDepartures(stationID);
33	cache.put(stationID, list);
34	} else {
35	logger.info("Departure: Cache hit " + stationID); //remove before production
36	}
37	return list;
38	}
39
40
41	public List<DepartureBean> lookupDepartures(int stationID) throws Exception {
42	List<DepartureBean> departureList = new ArrayList<DepartureBean>();
43
44	Connection conn = null;
45	try
46	{
47	conn = DBConnection.getConnection();
48
49	String SQL = "SELECT stationcode_fjrn, stationcode_stog FROM trainstations WHERE id=" + stationID;
50	Statement stmt = conn.createStatement();
51	ResultSet rs = stmt.executeQuery(SQL);
52
53	if (rs.next()) {
54	String code = rs.getString( 1 );
55	if (! rs.wasNull() ) {
56	List<DepartureBean> list = lookupDepartures(code, "FJRN");
57	departureList.addAll(list);
58	}
59
60	code = rs.getString(2);
61	if (! rs.wasNull() ) {
62	List<DepartureBean> list = lookupDepartures(code, "S2");
63	departureList.addAll(list);
64	}
65	Collections.sort( departureList );
66
67	}
68
69	} finally {
70	if (conn != null && !conn.isClosed() ) {
71	conn.close();
72	}
73	}
74
75	return departureList;
76	}
77
78	public List<DepartureBean> lookupDepartures(String stationcode, String type) throws Exception {
79
80	List<DepartureBean> departureList = new ArrayList<DepartureBean>();
81
82	final WebClient webClient = new WebClient();
83	webClient.setTimeout(2500);
84	webClient.setJavaScriptEnabled(false);
85
86
87	final HtmlPage page = webClient.getPage("http://www.bane.dk/visStation.asp?ArtikelID=4275&W=" + type + "&S=" + stationcode);
88
89	HtmlElement table = page.getElementById("afgangtabel");
90
91	if (table != null) {
92	DomNodeList<HtmlElement> tableRows = table.getElementsByTagName("tr");
93
94	for (HtmlElement currentRow : tableRows) {
95	String rowClass = currentRow.getAttribute("class");
96	if (rowClass != null && rowClass.toLowerCase().contains("station") ) {
97	DomNodeList<HtmlElement> fields = currentRow.getElementsByTagName("td");
98
99	DepartureBean departure = new DepartureBean();
100
101	String time = fields.get(0).asText();
102	if (time.equals(""))
103	time = "0:00"; //Bane.dk bug work-around
104	departure.setTime(time);
105
106	int updated = extractUpdated( fields.get(1) );
107	departure.setUpdated(updated);
108
109	String trainNumber = fields.get(2).asText();
110	if (trainNumber.trim().length() == 1)
111	trainNumber = trainNumber + " " + extractTrainNumber(fields.get(2));
112	departure.setTrainNumber(trainNumber);
113
114	String destination = fields.get(3).asText();
115	departure.setDestination(destination);
116
117	String origin = fields.get(4).asText();
118	departure.setOrigin(origin);
119
120	String location = fields.get(5).asText();
121	departure.setLocation(location);
122
123	String status = fields.get(6).asText();
124	departure.setStatus(status);
125
126	String note = extractNote( fields.get(7) );
127	departure.setNote(note);
128
129	departureList.add(departure);
130	}
131	}
132	} else {
133	logger.warning("No departures found for station=" + stationcode + ", type=" + type);
134	}
135
136	return departureList;
137	}
138
139	private int extractUpdated(HtmlElement updatedTd) { //extract the digit (in this case: 4) from "media/trafikinfo/opdater4.gif"
140	int updated = -1;
141
142	DomNodeList<HtmlElement> updatedImgs = updatedTd.getElementsByTagName("img");
143	String updatedStr = updatedImgs.get(0).getAttribute("src");
144
145	if (updatedStr != null) {
146	for (int i=0; i<updatedStr.length(); i++) {
147	char c = updatedStr.charAt(i);
148	if ( Character.isDigit(c)) {
149	updated = Character.digit(c, 10);
150	break;
151	}
152	}
153	}
154	return updated;
155	}
156
157	private String extractNote(HtmlElement noteTd) {
158	String note = noteTd.asText().trim();
159
160	List<HtmlElement> elems = noteTd.getElementsByAttribute("span", "class", "bemtype");
161	if (elems.size() > 0 && note.charAt(note.length()-1) == 'i')
162	note = note.substring(0,note.length() -1 );
163
164	return note;
165	}
166
167	private String extractTrainNumber(HtmlElement trainTd) {
168	String number = "";
169	HtmlElement anchorElement = trainTd.getElementsByTagName("a").get(0);
170	String href = anchorElement.getAttribute("href");
171	String argstring = href.substring( href.indexOf('?') + 1);
172
173	String args[] = argstring.split("&");
174	for (String arg : args) {
175	String pair[] = arg.split("="); // Key=pair[0], Value=pair[1]
176
177	if (pair[0].equalsIgnoreCase("TogNr"))
178	number = pair[1];
179	}
180
181
182
183	return number;
184	}
185
186	//test
187	public static void main(String args[]) throws Exception{
188	DepartureFetcher f = new DepartureFetcher();
189	List<DepartureBean> deps = f.lookupDepartures("AR", "FJRN");
190	for(DepartureBean d : deps) {
191	System.out.println( d.getTime() + ";" + d.getUpdated() + ";" + d.getTrainNumber() + ";" +
192	d.getDestination() + ";" + d.getOrigin() + ";" + d.getLocation() + ";" + d.getStatus() + ";" + d.getNote() );
193	}
194
195	System.out.println("--------------------------");
196	}
197	}