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package dk.thoerup.traininfo.provider; |
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import java.io.EOFException; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.FileOutputStream; |
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import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.util.Collections; |
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import java.util.Comparator; |
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import java.util.LinkedList; |
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import org.simpleframework.xml.Serializer; |
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import org.simpleframework.xml.core.Persister; |
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import android.content.Context; |
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import android.location.Location; |
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import android.util.Log; |
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import dk.thoerup.android.traininfo.common.StationBean; |
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import dk.thoerup.android.traininfo.common.StationEntry; |
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import dk.thoerup.genericjavautils.HttpUtil; |
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import dk.thoerup.traininfo.util.IntSet; |
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import dk.thoerup.traininfo.util.XmlUtil; |
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public class OfflineStationProvider implements StationProvider { |
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StationBean stations = new StationBean(); |
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public boolean loadStations(Context context) throws Exception { |
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long start = System.currentTimeMillis(); |
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stations.entries.clear(); //TODO: remove |
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File parent = context.getFilesDir(); |
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File stationsFile = new File(parent, "stations.bin"); |
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if (!stationsFile.exists()) |
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return false; |
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/*int size = (int) stationsFile.length(); |
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byte data[] = new byte[size]; |
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RandomAccessFile raf = new RandomAccessFile(stationsFile, "r"); |
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raf.readFully(data); |
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Serializer serializer = new Persister(); |
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stations = serializer.read(StationBean.class, new String(data, "ISO-8859-1") );*/ |
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try { |
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ObjectInputStream in = new ObjectInputStream( new FileInputStream(stationsFile) ); |
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Object o; |
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StationEntry e = null; |
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while ( (o=in.readObject()) != null ) { |
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e = (StationEntry) o; |
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e.updateSearch(); |
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stations.entries.add( e ); |
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} |
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in.close(); |
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} catch (EOFException e) { |
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//do nothing; |
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} |
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Log.e("OFFLINE", "loaded" + stations.entries.size()); |
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logElapsedTime(start, "loadStations"); |
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return true; |
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} |
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public void downloadStations(Context context) throws Exception { |
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File parent = context.getFilesDir(); |
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File stationsFile = new File(parent, "stations.bin"); |
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byte data[] = HttpUtil.getContent(XmlUtil.SERVICE_BASE + "/LocateStations?dump=1", 5000); |
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Serializer serializer = new Persister(); |
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stations = serializer.read(StationBean.class, new String(data, "ISO-8859-1") ); |
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ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream(stationsFile) ); |
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Log.e("OFFLINE", "data size" + data.length); |
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for (StationEntry entry : stations.entries) { |
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entry.updateSearch(); //prepare name fields for byName search |
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out.writeObject(entry); |
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} |
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out.close(); |
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} |
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@Override |
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public void purgeOldEntries() { |
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} |
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Comparator<StationEntry> distanceComparator = new Comparator<StationEntry>() { |
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@Override |
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public int compare(StationEntry object1, StationEntry object2) { |
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if (object1.getCalcdist() == object2.getCalcdist()) |
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return 0; |
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if (object1.getCalcdist() > object2.getCalcdist()) |
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return 1; |
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else |
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return -1; |
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} |
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}; |
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@Override |
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public StationBean lookupStationsByLocation(Location location) { |
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long start = System.currentTimeMillis(); |
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Location tmpLoc = new Location("GPS"); |
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LinkedList<StationEntry> entries = new LinkedList<StationEntry>() ; |
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for (StationEntry entry : stations.entries) { |
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tmpLoc.setLatitude(entry.getLatitude()); |
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tmpLoc.setLongitude(entry.getLongitude()); |
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int distance = (int) location.distanceTo(tmpLoc); |
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if (entries.size() <8 || entries.getLast().getCalcdist() > distance) { |
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entry.setCalcdist(distance); |
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if (entries.size() == 8) |
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entries.removeLast(); |
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entries.addLast(entry); |
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Collections.sort( entries, distanceComparator); |
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} |
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} |
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logElapsedTime(start, "location_stage1"); |
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Collections.sort( entries, distanceComparator); |
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StationBean tmpStations = new StationBean(); |
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for (int i = 0; i<8; i++) { |
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tmpStations.entries.add( entries.get(i) ); |
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} |
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logElapsedTime(start, "location"); |
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return tmpStations; |
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} |
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private void logElapsedTime(long start, String method) { |
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long now = System.currentTimeMillis(); |
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Log.i("TrainInfo", "Search by " + method + " elapsed " + (now-start) ); |
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} |
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@Override |
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public StationBean lookupStationsByName(String name) { |
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long start = System.currentTimeMillis(); |
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name = name.toLowerCase(); |
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StationBean tmpStations = new StationBean(); |
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for (StationEntry entry : stations.entries) { |
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if (entry.nameLower.startsWith(name) || entry.nameInternational.startsWith(name) ) { |
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tmpStations.entries.add(entry); |
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} |
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} |
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logElapsedTime(start, "name"); |
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return tmpStations; |
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} |
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@Override |
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public StationBean lookupStationsByIds(String ids) { |
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IntSet idset = new IntSet(); |
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idset.fromString(ids); |
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StationBean tmpStations = new StationBean(); |
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for (StationEntry entry : stations.entries) { |
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if (idset.contains( entry.getId() ) ) { |
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tmpStations.entries.add(entry); |
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} |
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} |
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return tmpStations; |
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} |
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} |