traininfo/provider/XmlDepartureProvider.java

package dk.thoerup.traininfo.provider;

import java.io.StringReader;

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