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