traininfo/provider/XmlDepartureProvider.java

package dk.thoerup.traininfo.provider;

import java.io.StringReader;
import java.util.ArrayList;
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.AndroidTimeoutCache;
import dk.thoerup.traininfo.util.DownloadUtil;
import dk.thoerup.traininfo.util.XmlUtil;

public class XmlDepartureProvider extends DefaultHandler implements DepartureProvider {

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