traininfo/provider/OfflineStationProvider.java

package dk.thoerup.traininfo.provider;

import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;

import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

import android.content.Context;
import android.location.Location;
import android.util.Log;
import dk.thoerup.android.traininfo.common.StationBean;
import dk.thoerup.android.traininfo.common.StationEntry;
import dk.thoerup.genericjavautils.HttpUtil;
import dk.thoerup.traininfo.util.IntSet;
import dk.thoerup.traininfo.util.XmlUtil;

public class OfflineStationProvider implements StationProvider {
        
        StationBean stations = new StationBean();


        public boolean loadStations(Context context) throws Exception {
                long start = System.currentTimeMillis();
                
                stations.entries.clear(); //TODO: remove
                
                File parent = context.getFilesDir();
                File stationsFile = new File(parent, "stations.bin");
                
                if (!stationsFile.exists())
                        return false;
                
                /*int size = (int) stationsFile.length();
                byte data[] = new byte[size];
                
                RandomAccessFile raf = new RandomAccessFile(stationsFile, "r");
                raf.readFully(data);
                
                Serializer serializer = new Persister();
                stations = serializer.read(StationBean.class,  new String(data, "ISO-8859-1") );*/
                
                
                try {
                        ObjectInputStream in = new ObjectInputStream( new FileInputStream(stationsFile) );
                        Object o;
                        StationEntry e = null;
                        while ( (o=in.readObject()) != null ) {
                                e = (StationEntry) o;
                                e.updateSearch();
                                stations.entries.add( e );
                        }
                        in.close();
                } catch (EOFException e) {
                        //do nothing;
                }
                
                Log.e("OFFLINE", "loaded" + stations.entries.size());
                logElapsedTime(start, "loadStations");
                
                return true;
        }       
        
        public void downloadStations(Context context) throws Exception {
                File parent = context.getFilesDir();
                File stationsFile = new File(parent, "stations.bin");

                
                byte data[] = HttpUtil.getContent(XmlUtil.SERVICE_BASE + "/LocateStations?dump=1", 5000);
                Serializer serializer = new Persister();
                stations = serializer.read(StationBean.class,  new String(data, "ISO-8859-1") );
                
                
                ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream(stationsFile) );
                Log.e("OFFLINE", "data size" + data.length);
                
                for (StationEntry entry : stations.entries) {
                        entry.updateSearch(); //prepare name fields for byName search
                        out.writeObject(entry);
                }
                
                out.close();            
        }
        
        
        @Override
        public void purgeOldEntries() {
        }

        Comparator<StationEntry> distanceComparator = new Comparator<StationEntry>() {
                @Override
                public int compare(StationEntry object1, StationEntry object2) {
                        if (object1.getCalcdist() == object2.getCalcdist())                                     
                                return 0;
                        
                        if (object1.getCalcdist() > object2.getCalcdist())
                                return 1;
                        else
                                return -1;
                }               
        };
        
        @Override
        public StationBean lookupStationsByLocation(Location location) {
                
                long start = System.currentTimeMillis();
                Location tmpLoc = new Location("GPS");
                
                LinkedList<StationEntry> entries = new LinkedList<StationEntry>() ;
                
                for (StationEntry entry : stations.entries) {
                        tmpLoc.setLatitude(entry.getLatitude());
                        tmpLoc.setLongitude(entry.getLongitude());
                        
                        int distance = (int) location.distanceTo(tmpLoc);
                        
                        if (entries.size() <8 || entries.getLast().getCalcdist() > distance) {
                                entry.setCalcdist(distance);
                                
                                if (entries.size() == 8)
                                        entries.removeLast();
                                
                                entries.addLast(entry);
                                
                                Collections.sort( entries, distanceComparator);
                        }                       
                }
                
                logElapsedTime(start, "location_stage1");
                
                Collections.sort( entries, distanceComparator);
                
                StationBean tmpStations = new StationBean();
                for (int i = 0; i<8; i++) {
                        tmpStations.entries.add( entries.get(i) );
                }
                
                logElapsedTime(start, "location");
                return tmpStations;
        }
        
        private void logElapsedTime(long start, String method) {
                long now = System.currentTimeMillis();
                
                Log.i("TrainInfo", "Search by " + method + " elapsed " + (now-start) );
        }

        @Override
        public StationBean lookupStationsByName(String name) {
                
                long start = System.currentTimeMillis();
                
                name = name.toLowerCase();
                StationBean tmpStations = new StationBean();
                for (StationEntry entry : stations.entries) {
                        if (entry.nameLower.startsWith(name) || entry.nameInternational.startsWith(name) ) {
                                tmpStations.entries.add(entry);
                        }
                }
                logElapsedTime(start, "name");                          
                return tmpStations;
        }

        @Override
        public StationBean lookupStationsByIds(String ids) {
                IntSet idset = new IntSet();
                idset.fromString(ids);
                
                StationBean tmpStations = new StationBean();
                for (StationEntry entry : stations.entries) {
                        if (idset.contains( entry.getId() ) ) {
                                tmpStations.entries.add(entry);
                        }
                }
                
                return tmpStations;
        }

}
1	package dk.thoerup.traininfo.provider;
2
3	import java.io.EOFException;
4	import java.io.File;
5	import java.io.FileInputStream;
6	import java.io.FileOutputStream;
7	import java.io.ObjectInputStream;
8	import java.io.ObjectOutputStream;
9	import java.util.Collections;
10	import java.util.Comparator;
11	import java.util.LinkedList;
12
13	import org.simpleframework.xml.Serializer;
14	import org.simpleframework.xml.core.Persister;
15
16	import android.content.Context;
17	import android.location.Location;
18	import android.util.Log;
19	import dk.thoerup.android.traininfo.common.StationBean;
20	import dk.thoerup.android.traininfo.common.StationEntry;
21	import dk.thoerup.genericjavautils.HttpUtil;
22	import dk.thoerup.traininfo.util.IntSet;
23	import dk.thoerup.traininfo.util.XmlUtil;
24
25	public class OfflineStationProvider implements StationProvider {
26
27	StationBean stations = new StationBean();
28
29
30	public boolean loadStations(Context context) throws Exception {
31	long start = System.currentTimeMillis();
32
33	stations.entries.clear(); //TODO: remove
34
35	File parent = context.getFilesDir();
36	File stationsFile = new File(parent, "stations.bin");
37
38	if (!stationsFile.exists())
39	return false;
40
41	/*int size = (int) stationsFile.length();
42	byte data[] = new byte[size];
43
44	RandomAccessFile raf = new RandomAccessFile(stationsFile, "r");
45	raf.readFully(data);
46
47	Serializer serializer = new Persister();
48	stations = serializer.read(StationBean.class, new String(data, "ISO-8859-1") );*/
49
50
51	try {
52	ObjectInputStream in = new ObjectInputStream( new FileInputStream(stationsFile) );
53	Object o;
54	StationEntry e = null;
55	while ( (o=in.readObject()) != null ) {
56	e = (StationEntry) o;
57	e.updateSearch();
58	stations.entries.add( e );
59	}
60	in.close();
61	} catch (EOFException e) {
62	//do nothing;
63	}
64
65	Log.e("OFFLINE", "loaded" + stations.entries.size());
66	logElapsedTime(start, "loadStations");
67
68	return true;
69	}
70
71	public void downloadStations(Context context) throws Exception {
72	File parent = context.getFilesDir();
73	File stationsFile = new File(parent, "stations.bin");
74
75
76	byte data[] = HttpUtil.getContent(XmlUtil.SERVICE_BASE + "/LocateStations?dump=1", 5000);
77	Serializer serializer = new Persister();
78	stations = serializer.read(StationBean.class, new String(data, "ISO-8859-1") );
79
80
81	ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream(stationsFile) );
82	Log.e("OFFLINE", "data size" + data.length);
83
84	for (StationEntry entry : stations.entries) {
85	entry.updateSearch(); //prepare name fields for byName search
86	out.writeObject(entry);
87	}
88
89	out.close();
90	}
91
92
93
94	@Override
95	public void purgeOldEntries() {
96	}
97
98	Comparator<StationEntry> distanceComparator = new Comparator<StationEntry>() {
99	@Override
100	public int compare(StationEntry object1, StationEntry object2) {
101	if (object1.getCalcdist() == object2.getCalcdist())
102	return 0;
103
104	if (object1.getCalcdist() > object2.getCalcdist())
105	return 1;
106	else
107	return -1;
108	}
109	};
110
111	@Override
112	public StationBean lookupStationsByLocation(Location location) {
113
114	long start = System.currentTimeMillis();
115	Location tmpLoc = new Location("GPS");
116
117	LinkedList<StationEntry> entries = new LinkedList<StationEntry>() ;
118
119	for (StationEntry entry : stations.entries) {
120	tmpLoc.setLatitude(entry.getLatitude());
121	tmpLoc.setLongitude(entry.getLongitude());
122
123	int distance = (int) location.distanceTo(tmpLoc);
124
125	if (entries.size() <8 \|\| entries.getLast().getCalcdist() > distance) {
126	entry.setCalcdist(distance);
127
128	if (entries.size() == 8)
129	entries.removeLast();
130
131	entries.addLast(entry);
132
133	Collections.sort( entries, distanceComparator);
134	}
135	}
136
137	logElapsedTime(start, "location_stage1");
138
139	Collections.sort( entries, distanceComparator);
140
141	StationBean tmpStations = new StationBean();
142	for (int i = 0; i<8; i++) {
143	tmpStations.entries.add( entries.get(i) );
144	}
145
146	logElapsedTime(start, "location");
147	return tmpStations;
148	}
149
150	private void logElapsedTime(long start, String method) {
151	long now = System.currentTimeMillis();
152
153	Log.i("TrainInfo", "Search by " + method + " elapsed " + (now-start) );
154	}
155
156	@Override
157	public StationBean lookupStationsByName(String name) {
158
159	long start = System.currentTimeMillis();
160
161	name = name.toLowerCase();
162	StationBean tmpStations = new StationBean();
163	for (StationEntry entry : stations.entries) {
164	if (entry.nameLower.startsWith(name) \|\| entry.nameInternational.startsWith(name) ) {
165	tmpStations.entries.add(entry);
166	}
167	}
168	logElapsedTime(start, "name");
169	return tmpStations;
170	}
171
172	@Override
173	public StationBean lookupStationsByIds(String ids) {
174	IntSet idset = new IntSet();
175	idset.fromString(ids);
176
177	StationBean tmpStations = new StationBean();
178	for (StationEntry entry : stations.entries) {
179	if (idset.contains( entry.getId() ) ) {
180	tmpStations.entries.add(entry);
181	}
182	}
183
184	return tmpStations;
185	}
186
187	}