traininfo/provider/XmlTimetableProvider.java

package dk.thoerup.traininfo.provider;

import java.util.ArrayList;
import java.util.List;

import org.w3c.dom.Document;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import android.util.Log;
import dk.thoerup.traininfo.TimetableBean;
import dk.thoerup.traininfo.util.AndroidTimeoutCache;
import dk.thoerup.traininfo.util.DownloadUtil;
import dk.thoerup.traininfo.util.XmlUtil;

public class XmlTimetableProvider implements TimetableProvider {
        
        final static int CACHE_TIMEOUT = 60*1000;

        AndroidTimeoutCache<String,List<TimetableBean>> departureCache = new AndroidTimeoutCache<String,List<TimetableBean>>(CACHE_TIMEOUT);    

        @Override
        public List<TimetableBean> lookupTimetable(String type, String trainID) {
                
                String trainNumber = extractTrainNumber(trainID);
                
                String key = type + "-" + trainID;
                List<TimetableBean> timetables = departureCache.get(key);
        
                if (timetables == null) {                       
                        timetables = lookupTimetableWorker(type, trainNumber);
                        
                        if (timetables != null) {                       
                                departureCache.put(key, timetables);
                        }
                        
                } else {
                        Log.i("XmlTimetableProvider", "cache hit !!!");
                }               
                
                return timetables;
        }
        

        public List<TimetableBean> lookupTimetableWorker(String type, String trainNumber) {

                String url = XmlUtil.SERVICE_BASE + "/TimetableServlet?train=" + trainNumber + "&type=" + type;
                Log.i("url", url);
                try {
                        List<TimetableBean> timetables = new ArrayList<TimetableBean>();
                        
                        String xml = DownloadUtil.getContentString(url, 15000, "ISO-8859-1");
                        
                        
                        Document doc = XmlUtil.parseXML(xml);
                        Node rootNode = doc.getDocumentElement(); // stations
                        NodeList stationList = rootNode.getChildNodes();
                        

                        for (int i=0; i<stationList.getLength(); i++) {
                                Node entryNode = stationList.item(i);
                                
                                if (! entryNode.getNodeName().equals("entry"))
                                        continue;
        
                                TimetableBean timetable = new TimetableBean();
                                
                                NodeList entries = entryNode.getChildNodes();                           
                                
                                if (entryNode.hasAttributes() && entryNode.getAttributes().getNamedItem("current") != null) {                                   
                                        timetable.setCurrent( Boolean.parseBoolean(entryNode.getAttributes().getNamedItem("current").getNodeValue()));
                                } else {
                                        timetable.setCurrent(false);
                                }
                                
                                for (int j=0; j<entries.getLength(); j++) {     
                                        Node current = entries.item(j);
                                                                                
                                        String content = null;
                                        if (current.getFirstChild() != null) 
                                                content = current.getFirstChild().getNodeValue(); //get the textNode - then get the text node's value
                                        
                                        String nodeName = current.getNodeName();
                                        
                                        if (nodeName.equals("station"))
                                                timetable.setStation( content );                                                
                                        
                                        if (nodeName.equals("arrival"))
                                                timetable.setArrival( content );
                                        
                                        if (nodeName.equals("departure"))
                                                timetable.setDeparture( content );
                                        
                                        if (nodeName.equals("stationid"))
                                                timetable.setStationId( Integer.parseInt(content));
                                        
                                        /*if (nodeName.equals("current"))
                                                timetable.setCurrent( Boolean.parseBoolean(content) );*/

                                }
                                timetables.add(timetable);                              
                        }
                        return timetables;
                        
                        
                } catch (Exception e) {
                        Log.e("XmlStationProvider", "lookupStations: ", e);
                }

                return null;
        }
        
        private String extractTrainNumber (String trainID) {

                String parts[]  = trainID.split(" ");
                if (parts.length == 2) {
                        return parts[1];
                } else {
                        return parts[0];
                }
        }

}
1	package dk.thoerup.traininfo.provider;
2
3	import java.util.ArrayList;
4	import java.util.List;
5
6	import org.w3c.dom.Document;
7
8	import org.w3c.dom.Node;
9	import org.w3c.dom.NodeList;
10
11	import android.util.Log;
12	import dk.thoerup.traininfo.TimetableBean;
13	import dk.thoerup.traininfo.util.AndroidTimeoutCache;
14	import dk.thoerup.traininfo.util.DownloadUtil;
15	import dk.thoerup.traininfo.util.XmlUtil;
16
17	public class XmlTimetableProvider implements TimetableProvider {
18
19	final static int CACHE_TIMEOUT = 60*1000;
20
21	AndroidTimeoutCache<String,List<TimetableBean>> departureCache = new AndroidTimeoutCache<String,List<TimetableBean>>(CACHE_TIMEOUT);
22
23	@Override
24	public List<TimetableBean> lookupTimetable(String type, String trainID) {
25
26	String trainNumber = extractTrainNumber(trainID);
27
28	String key = type + "-" + trainID;
29	List<TimetableBean> timetables = departureCache.get(key);
30
31	if (timetables == null) {
32	timetables = lookupTimetableWorker(type, trainNumber);
33
34	if (timetables != null) {
35	departureCache.put(key, timetables);
36	}
37
38	} else {
39	Log.i("XmlTimetableProvider", "cache hit !!!");
40	}
41
42	return timetables;
43	}
44
45
46	public List<TimetableBean> lookupTimetableWorker(String type, String trainNumber) {
47
48	String url = XmlUtil.SERVICE_BASE + "/TimetableServlet?train=" + trainNumber + "&type=" + type;
49	Log.i("url", url);
50	try {
51	List<TimetableBean> timetables = new ArrayList<TimetableBean>();
52
53	String xml = DownloadUtil.getContentString(url, 15000, "ISO-8859-1");
54
55
56	Document doc = XmlUtil.parseXML(xml);
57	Node rootNode = doc.getDocumentElement(); // stations
58	NodeList stationList = rootNode.getChildNodes();
59
60
61	for (int i=0; i<stationList.getLength(); i++) {
62	Node entryNode = stationList.item(i);
63
64	if (! entryNode.getNodeName().equals("entry"))
65	continue;
66
67	TimetableBean timetable = new TimetableBean();
68
69	NodeList entries = entryNode.getChildNodes();
70
71	if (entryNode.hasAttributes() && entryNode.getAttributes().getNamedItem("current") != null) {
72	timetable.setCurrent( Boolean.parseBoolean(entryNode.getAttributes().getNamedItem("current").getNodeValue()));
73	} else {
74	timetable.setCurrent(false);
75	}
76
77	for (int j=0; j<entries.getLength(); j++) {
78	Node current = entries.item(j);
79
80	String content = null;
81	if (current.getFirstChild() != null)
82	content = current.getFirstChild().getNodeValue(); //get the textNode - then get the text node's value
83
84	String nodeName = current.getNodeName();
85
86	if (nodeName.equals("station"))
87	timetable.setStation( content );
88
89	if (nodeName.equals("arrival"))
90	timetable.setArrival( content );
91
92	if (nodeName.equals("departure"))
93	timetable.setDeparture( content );
94
95	if (nodeName.equals("stationid"))
96	timetable.setStationId( Integer.parseInt(content));
97
98	/*if (nodeName.equals("current"))
99	timetable.setCurrent( Boolean.parseBoolean(content) );*/
100
101	}
102	timetables.add(timetable);
103	}
104	return timetables;
105
106
107	} catch (Exception e) {
108	Log.e("XmlStationProvider", "lookupStations: ", e);
109	}
110
111	return null;
112	}
113
114	private String extractTrainNumber (String trainID) {
115
116	String parts[] = trainID.split(" ");
117	if (parts.length == 2) {
118	return parts[1];
119	} else {
120	return parts[0];
121	}
122	}
123
124	}