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	torben	237	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	torben	390	import dk.thoerup.traininfo.util.AndroidTimeoutCache;
19	torben	238	import dk.thoerup.traininfo.util.DownloadUtil;
20	torben	357	import dk.thoerup.traininfo.util.XmlUtil;
21	torben	237
22			public class XmlDepartureProvider extends DefaultHandler implements DepartureProvider {
23
24	torben	390	final static int CACHE_TIMEOUT = 60*1000;
25	torben	237
26	torben	319	class CacheEntry {
27			public long timestamp;
28			public List<DepartureBean> departures;
29			}
30	torben	237
31	torben	390
32			AndroidTimeoutCache<Integer,List<DepartureBean>> departureCache = new AndroidTimeoutCache<Integer,List<DepartureBean>>(CACHE_TIMEOUT);
33
34			List<DepartureBean> departures;
35	torben	319
36
37	torben	237	DepartureBean tempDeparture;
38			StringBuilder builder = new StringBuilder(512);
39
40			@Override
41	torben	390	public boolean lookupDepartures(int stationID) {
42	torben	319	boolean success;
43	torben	390
44			departures = departureCache.get(stationID);
45	torben	319
46	torben	390	if (departures == null) {
47	torben	319	success = lookupDeparturesWorker(stationID);
48
49	torben	390	if (success) {
50			departureCache.put(stationID, departures);
51			}
52	torben	319
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	torben	237	try
65	torben	294	{
66	torben	357
67	torben	358	String url = XmlUtil.SERVICE_BASE + "/DepartureServlet?format=xml&station=" + stationID;
68	torben	294	Log.i("xmlurl",url);
69	torben	283	String doc = DownloadUtil.getContentString(url, 45000, "ISO-8859-1");
70	torben	237
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	torben	319	success = true;
81
82	torben	237	} catch (Exception e) {
83			Log.e("XmlDepartureProvider", "looupFunction", e);
84			}
85	torben	319	return success;
86	torben	237	}
87
88			@Override
89	torben	319	public List<DepartureBean> getDepartures(int station) {
90	torben	390	List<DepartureBean> list = departureCache.get(station);
91	torben	319
92	torben	390	if (list == null) {
93			list = new ArrayList<DepartureBean>();
94			}
95	torben	319
96	torben	390	return list;
97	torben	237	}
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	torben	244	tempDeparture.setTime(builder.toString().trim());
123	torben	237	} else if (name.equals("updated")) {
124	torben	244	tempDeparture.setLastUpdate(builder.toString().trim());
125	torben	237	} else if (name.equals("trainnumber")) {
126	torben	244	tempDeparture.setTrainNumber(builder.toString().trim());
127	torben	237	} else if (name.equals("destination")) {
128	torben	244	tempDeparture.setDestination(builder.toString().trim());
129	torben	237	} else if (name.equals("origin")) {
130	torben	244	tempDeparture.setOrigin(builder.toString().trim());
131	torben	237	} else if (name.equals("location")) {
132	torben	244	tempDeparture.setLocation(builder.toString().trim());
133	torben	237	} else if (name.equals("status")) {
134	torben	244	tempDeparture.setStatus(builder.toString().trim());
135	torben	237	} else if (name.equals("note")) {
136	torben	244	tempDeparture.setNote(builder.toString().trim());
137	torben	237	}
138			}
139			}