traininfo/provider/XmlDepartureProvider.java

package dk.thoerup.traininfo.provider;

import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

import android.util.Log;
import dk.thoerup.traininfo.DepartureBean;
import dk.thoerup.traininfo.util.DownloadUtil;

public class XmlDepartureProvider extends DefaultHandler implements DepartureProvider {

        final static long CACHE_TIMEOUT = 60*1000;
        
        class CacheEntry {
                public long timestamp;
                public List<DepartureBean> departures;
        }
        
        HashMap<Integer, CacheEntry> departureCache = new HashMap<Integer,CacheEntry>();        
        ArrayList<DepartureBean> departures;
                
        
        DepartureBean tempDeparture;
        StringBuilder builder = new StringBuilder(512);
        
        @Override
        public boolean lookupDepartures(int stationID) {
                CacheEntry entry = departureCache.get(stationID);
                boolean success;
        
                long now = android.os.SystemClock.elapsedRealtime();
                if (entry == null || (entry.timestamp+CACHE_TIMEOUT) < now) {
                        
                        success = lookupDeparturesWorker(stationID);
                        
                        if (success) {
                                entry = new CacheEntry();
                                entry.timestamp = android.os.SystemClock.elapsedRealtime();
                                entry.departures = departures;
                        
                                departureCache.put(stationID, entry);
                        }
                } else {
                        Log.i("XmlDepartureProvider", "cache hit !!!");
                        success = true;
                }               
                
                return success;
        }
        
        private boolean lookupDeparturesWorker(int stationID) {
                boolean success = false;
                departures = new ArrayList<DepartureBean>();
                try
                {       
                        //String url = "http://t-hoerup.dk/tog/xml_display.php?stationcode="+stationCode;
                        String url = "http://app.t-hoerup.dk/TrainInfoService/DepartureServlet?format=xml&station=" + stationID;
                        Log.i("xmlurl",url);
                        String doc =  DownloadUtil.getContentString(url, 45000, "ISO-8859-1");
                        
                        InputSource source = new InputSource( new StringReader(doc));
                        
                        SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();

                        xr.setContentHandler(this);
                        xr.setErrorHandler(this);
                        xr.parse(source);
                        success = true;
                        
                } catch (Exception e) {
                        Log.e("XmlDepartureProvider", "looupFunction", e);
                }
                return success;
        }
        
        @Override
        public List<DepartureBean> getDepartures(int station) {
                CacheEntry entry = departureCache.get(station);
                
                if (entry != null) {                    
                        return entry.departures;
                } else {
                        return new ArrayList<DepartureBean>();
                }
                
        }
        
        // this can be called several times fore the same text-node if there are many chardata / lines
        @Override
        public void characters (char ch[], int start, int length) 
        {               
                for (int i= start; i<start+length; i++)
                        builder.append(ch[i]);  
        }
        
        @Override
        public void startElement (String uri, String name, String qName, Attributes atts)throws SAXException
        {
                if (name.equalsIgnoreCase("train"))
                        tempDeparture = new DepartureBean();
                
                builder.setLength(0); //reset StringBuilder
        }
        
        @Override
        public void endElement (String uri, String name, String qName) throws SAXException
        {
                if (name.equals("train")) {
                        departures.add( tempDeparture );
                } else if (name.equals("time")) {
                        tempDeparture.setTime(builder.toString().trim());
                } else if (name.equals("updated")) {
                        tempDeparture.setLastUpdate(builder.toString().trim());
                } else if (name.equals("trainnumber")) {
                        tempDeparture.setTrainNumber(builder.toString().trim());
                } else if (name.equals("destination")) {
                        tempDeparture.setDestination(builder.toString().trim());
                } else if (name.equals("origin")) {
                        tempDeparture.setOrigin(builder.toString().trim());
                } else if (name.equals("location")) {
                        tempDeparture.setLocation(builder.toString().trim());
                } else if (name.equals("status")) {
                        tempDeparture.setStatus(builder.toString().trim());
                } else if (name.equals("note")) {
                        tempDeparture.setNote(builder.toString().trim());
                } 
        }
}
1	package dk.thoerup.traininfo.provider;
2
3	import java.io.StringReader;
4	import java.util.ArrayList;
5	import java.util.Collections;
6	import java.util.HashMap;
7	import java.util.List;
8
9	import javax.xml.parsers.SAXParser;
10	import javax.xml.parsers.SAXParserFactory;
11
12	import org.xml.sax.Attributes;
13	import org.xml.sax.InputSource;
14	import org.xml.sax.SAXException;
15	import org.xml.sax.XMLReader;
16	import org.xml.sax.helpers.DefaultHandler;
17
18	import android.util.Log;
19	import dk.thoerup.traininfo.DepartureBean;
20	import dk.thoerup.traininfo.util.DownloadUtil;
21
22	public class XmlDepartureProvider extends DefaultHandler implements DepartureProvider {
23
24	final static long CACHE_TIMEOUT = 60*1000;
25
26	class CacheEntry {
27	public long timestamp;
28	public List<DepartureBean> departures;
29	}
30
31	HashMap<Integer, CacheEntry> departureCache = new HashMap<Integer,CacheEntry>();
32	ArrayList<DepartureBean> departures;
33
34
35	DepartureBean tempDeparture;
36	StringBuilder builder = new StringBuilder(512);
37
38	@Override
39	public boolean lookupDepartures(int stationID) {
40	CacheEntry entry = departureCache.get(stationID);
41	boolean success;
42
43	long now = android.os.SystemClock.elapsedRealtime();
44	if (entry == null \|\| (entry.timestamp+CACHE_TIMEOUT) < now) {
45
46	success = lookupDeparturesWorker(stationID);
47
48	if (success) {
49	entry = new CacheEntry();
50	entry.timestamp = android.os.SystemClock.elapsedRealtime();
51	entry.departures = departures;
52
53	departureCache.put(stationID, entry);
54	}
55	} else {
56	Log.i("XmlDepartureProvider", "cache hit !!!");
57	success = true;
58	}
59
60	return success;
61	}
62
63	private boolean lookupDeparturesWorker(int stationID) {
64	boolean success = false;
65	departures = new ArrayList<DepartureBean>();
66	try
67	{
68	//String url = "http://t-hoerup.dk/tog/xml_display.php?stationcode="+stationCode;
69	String url = "http://app.t-hoerup.dk/TrainInfoService/DepartureServlet?format=xml&station=" + stationID;
70	Log.i("xmlurl",url);
71	String doc = DownloadUtil.getContentString(url, 45000, "ISO-8859-1");
72
73	InputSource source = new InputSource( new StringReader(doc));
74
75	SAXParserFactory spf = SAXParserFactory.newInstance();
76	SAXParser sp = spf.newSAXParser();
77	XMLReader xr = sp.getXMLReader();
78
79	xr.setContentHandler(this);
80	xr.setErrorHandler(this);
81	xr.parse(source);
82	success = true;
83
84	} catch (Exception e) {
85	Log.e("XmlDepartureProvider", "looupFunction", e);
86	}
87	return success;
88	}
89
90	@Override
91	public List<DepartureBean> getDepartures(int station) {
92	CacheEntry entry = departureCache.get(station);
93
94	if (entry != null) {
95	return entry.departures;
96	} else {
97	return new ArrayList<DepartureBean>();
98	}
99
100	}
101
102	// this can be called several times fore the same text-node if there are many chardata / lines
103	@Override
104	public void characters (char ch[], int start, int length)
105	{
106	for (int i= start; i<start+length; i++)
107	builder.append(ch[i]);
108	}
109
110	@Override
111	public void startElement (String uri, String name, String qName, Attributes atts)throws SAXException
112	{
113	if (name.equalsIgnoreCase("train"))
114	tempDeparture = new DepartureBean();
115
116	builder.setLength(0); //reset StringBuilder
117	}
118
119	@Override
120	public void endElement (String uri, String name, String qName) throws SAXException
121	{
122	if (name.equals("train")) {
123	departures.add( tempDeparture );
124	} else if (name.equals("time")) {
125	tempDeparture.setTime(builder.toString().trim());
126	} else if (name.equals("updated")) {
127	tempDeparture.setLastUpdate(builder.toString().trim());
128	} else if (name.equals("trainnumber")) {
129	tempDeparture.setTrainNumber(builder.toString().trim());
130	} else if (name.equals("destination")) {
131	tempDeparture.setDestination(builder.toString().trim());
132	} else if (name.equals("origin")) {
133	tempDeparture.setOrigin(builder.toString().trim());
134	} else if (name.equals("location")) {
135	tempDeparture.setLocation(builder.toString().trim());
136	} else if (name.equals("status")) {
137	tempDeparture.setStatus(builder.toString().trim());
138	} else if (name.equals("note")) {
139	tempDeparture.setNote(builder.toString().trim());
140	}
141	}
142	}