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package dk.thoerup.traininfo.provider; |
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import java.net.URLEncoder; |
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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.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.traininfo.util.AndroidTimeoutCache; |
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import dk.thoerup.traininfo.util.DownloadUtil; |
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import dk.thoerup.traininfo.util.XmlUtil; |
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public class XmlStationProvider implements StationProvider { |
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final static int CACHE_TIMEOUT = 300*1000; |
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AndroidTimeoutCache<String, StationBean> stationCache = new AndroidTimeoutCache<String, StationBean>(CACHE_TIMEOUT); |
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double roundToPlaces(double value, int places) { |
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double pow = Math.pow(10, places); |
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double temp = Math.round( value*pow ); |
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return temp / pow; |
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} |
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@Override |
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public StationBean lookupStationsByLocation(Location location) { |
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double lat = roundToPlaces(location.getLatitude(), 4); |
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double lng = roundToPlaces(location.getLongitude(), 4); |
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String url = XmlUtil.SERVICE_BASE + "/LocateStations?latitude=" + lat + "&longitude=" + lng; |
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Log.i("url", url); |
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return lookupStationsWorker(url); |
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} |
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@Override |
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public StationBean lookupStationsByName(String name) { |
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try { |
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name = URLEncoder.encode(name, "ISO8859-1"); |
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} catch (Exception e) { |
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Log.e("lookupStations", "Encoding failed", e);//if encoding fails use original and hope for the best |
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} |
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String url = XmlUtil.SERVICE_BASE + "/LocateStations?name=" + name; |
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Log.i("url", url); |
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return lookupStationsWorker(url); |
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} |
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@Override |
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public StationBean lookupStationsByIds(String ids) { |
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String url = ""; |
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url = XmlUtil.SERVICE_BASE + "/LocateStations?list=" + ids; |
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Log.i("url", url); |
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return lookupStationsWorker(url); |
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} |
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public StationBean lookupStationsWorker(String url) { |
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StationBean tmpStations = stationCache.get(url); |
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if (tmpStations != null) { |
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Log.i("lookupStations", "cache hit " + url); |
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} else { |
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tmpStations = fetchStations(url); |
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if (tmpStations != null) { |
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stationCache.put(url, tmpStations); |
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} |
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} |
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return tmpStations; |
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} |
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public StationBean fetchStations(String url) { |
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try { |
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String xml = DownloadUtil.getContentString(url, 15000, "ISO-8859-1"); |
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Serializer serializer = new Persister(); |
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StationBean stations = serializer.read(StationBean.class, xml); |
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return stations; |
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} catch (Exception e) { |
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Log.e("XmlStationProvider", "lookupStations: ", e); |
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return null; |
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} |
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} |
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@Override |
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public void purgeOldEntries() { |
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stationCache.purgeOldEntries(); |
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} |
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} |