traininfo/provider/XmlMetroProvider.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.util.AndroidTimeoutCache;
import dk.thoerup.traininfo.util.DownloadUtil;
import dk.thoerup.traininfo.util.XmlUtil;

public class XmlMetroProvider implements MetroProvider {
        
        final int CACHE_TIMEOUT = 60000;

        AndroidTimeoutCache<Integer,MetroBean> metroCache = new AndroidTimeoutCache<Integer,MetroBean>(CACHE_TIMEOUT);
        

        @Override
        public MetroBean lookupMetroInfo(int stationID) {
                
                MetroBean metro = metroCache.get(stationID);
        
                if (metro == null) {                    
                        metro = lookupMetroWorker(stationID);
                        
                        if (metro != null) {                    
                                metroCache.put(stationID, metro);
                        }
                        
                } else {
                        Log.i("XmlDepartureProvider", "cache hit !!!");
                }               
                
                return metro;
        }
        
        
        private MetroBean lookupMetroWorker(int stationID) {

                try
                {       
                        String url = XmlUtil.SERVICE_BASE + "/MetroServlet?station=" + stationID;
                        Log.i("xmlurl",url);
                        String doc =  DownloadUtil.getContentString(url, 15000, "ISO-8859-1");
                        
                        InputSource source = new InputSource( new StringReader(doc));
                        
                        SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();

            MetroParser metroParser = new MetroParser();
                        xr.setContentHandler(metroParser);
                        xr.setErrorHandler(metroParser);
                        xr.parse(source);
                        
                        return metroParser.getMetroDepartures();
                        
                } catch (Exception e) {
                        Log.e("XmlMetroProvider", "lookupFunction", e);
                        return null;
                }               
        }
        
        
        class MetroParser extends DefaultHandler { 
                
                StringBuilder builder = new StringBuilder(256);
                private MetroBean metro = new MetroBean();
                
                MetroEntry tempEntry = new MetroEntry();

                public MetroBean getMetroDepartures() {
                        return metro;
                }
                                
        
                // 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) 
                {               
                        builder.append(ch, start, length);
                }
                
                @Override
                public void startElement (String uri, String name, String qName, Attributes atts)throws SAXException
                {
                        if (name.equalsIgnoreCase("entry"))
                                tempEntry = new MetroEntry();
                        
                        builder.setLength(0); //reset StringBuilder
                }
                
                @Override
                public void endElement (String uri, String name, String qName) throws SAXException
                {
                        String str = builder.toString().trim();
                        
                        if (name.equals("entry")) {                     
                                metro.entries.add( tempEntry );                         
                        } else if (name.equals("head")) {
                                metro.head = str;                               
                        } else if (name.equals("operations")) {
                                metro.operationInfo = str;                              
                        } else if (name.equals("metro")) {
                                tempEntry.metro = str;
                        } else if (name.equals("destination")) {
                                tempEntry.destination = str;
                        } else if (name.equals("minutes")) {
                                tempEntry.minutes = str;
                        } else if (name.equals("plan")) {
                                metro.plan = str;
                        } 
                }
        }
        
}
1	torben	1053	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
16			import dk.thoerup.traininfo.util.AndroidTimeoutCache;
17			import dk.thoerup.traininfo.util.DownloadUtil;
18			import dk.thoerup.traininfo.util.XmlUtil;
19
20			public class XmlMetroProvider implements MetroProvider {
21
22			final int CACHE_TIMEOUT = 60000;
23
24			AndroidTimeoutCache<Integer,MetroBean> metroCache = new AndroidTimeoutCache<Integer,MetroBean>(CACHE_TIMEOUT);
25
26
27			@Override
28			public MetroBean lookupMetroInfo(int stationID) {
29
30			MetroBean metro = metroCache.get(stationID);
31
32			if (metro == null) {
33			metro = lookupMetroWorker(stationID);
34
35			if (metro != null) {
36			metroCache.put(stationID, metro);
37			}
38
39			} else {
40			Log.i("XmlDepartureProvider", "cache hit !!!");
41			}
42
43			return metro;
44			}
45
46
47			private MetroBean lookupMetroWorker(int stationID) {
48
49			try
50			{
51			String url = XmlUtil.SERVICE_BASE + "/MetroServlet?station=" + stationID;
52			Log.i("xmlurl",url);
53			String doc = DownloadUtil.getContentString(url, 15000, "ISO-8859-1");
54
55			InputSource source = new InputSource( new StringReader(doc));
56
57			SAXParserFactory spf = SAXParserFactory.newInstance();
58			SAXParser sp = spf.newSAXParser();
59			XMLReader xr = sp.getXMLReader();
60
61			MetroParser metroParser = new MetroParser();
62			xr.setContentHandler(metroParser);
63			xr.setErrorHandler(metroParser);
64			xr.parse(source);
65
66			return metroParser.getMetroDepartures();
67
68			} catch (Exception e) {
69			Log.e("XmlMetroProvider", "lookupFunction", e);
70			return null;
71			}
72			}
73
74
75			class MetroParser extends DefaultHandler {
76
77			StringBuilder builder = new StringBuilder(256);
78			private MetroBean metro = new MetroBean();
79
80			MetroEntry tempEntry = new MetroEntry();
81
82			public MetroBean getMetroDepartures() {
83			return metro;
84			}
85
86
87			// this can be called several times fore the same text-node if there are many chardata / lines
88			@Override
89			public void characters (char ch[], int start, int length)
90			{
91			builder.append(ch, start, length);
92			}
93
94			@Override
95			public void startElement (String uri, String name, String qName, Attributes atts)throws SAXException
96			{
97			if (name.equalsIgnoreCase("entry"))
98			tempEntry = new MetroEntry();
99
100			builder.setLength(0); //reset StringBuilder
101			}
102
103			@Override
104			public void endElement (String uri, String name, String qName) throws SAXException
105			{
106			String str = builder.toString().trim();
107
108			if (name.equals("entry")) {
109			metro.entries.add( tempEntry );
110			} else if (name.equals("head")) {
111			metro.head = str;
112			} else if (name.equals("operations")) {
113			metro.operationInfo = str;
114			} else if (name.equals("metro")) {
115			tempEntry.metro = str;
116			} else if (name.equals("destination")) {
117			tempEntry.destination = str;
118			} else if (name.equals("minutes")) {
119			tempEntry.minutes = str;
120			} else if (name.equals("plan")) {
121			metro.plan = str;
122			}
123			}
124			}
125
126			}