src/org/average/whereami/LastLocation.java

   1 package org.average.whereami;
   2
   3 import org.average.whereami.APIBase;
   4 import org.average.whereami.Oracle;
   5 import org.average.whereami.Utterance;
   6 import org.average.whereami.PersistentStore;
   7 import org.average.whereami.SayWhen;
   8
   9 import java.lang.Math;
  10 import java.io.IOException;
  11
  12 import com.google.api.client.googleapis.json.GoogleJsonResponseException;
  13 import com.google.api.client.http.HttpResponseException;
  14 import com.google.api.services.latitude.Latitude;
  15 import com.google.api.services.latitude.LatitudeRequest;
  16 import com.google.api.services.latitude.model.Location;
  17
  18 import android.content.Context;
  19 import android.content.res.Resources;
  20 import android.text.format.Time;
  21 import android.util.Log;
  22
  23 public final class LastLocation extends Oracle {
  24
  25         final String TAG = getClass().getName();
  26
  27         private String[] loc_names;
  28         private String[] loc_lats;
  29         private String[] loc_lons;
  30         private String[] loc_dists;
  31         private String myname;
  32         private String registered;
  33         private SayWhen sayWhen;
  34         private Latitude latitude;
  35
  36         public LastLocation(APIBase base) {
  37                 super(base);
  38                 loc_names = base.res.getStringArray(R.array.loc_names);
  39                 loc_lats = base.res.getStringArray(R.array.loc_lats);
  40                 loc_lons = base.res.getStringArray(R.array.loc_lons);
  41                 loc_dists = base.res.getStringArray(R.array.loc_dists);
  42                 myname = base.res.getString(R.string.myname);
  43                 registered = base.res.getString(R.string.registered);
  44                 sayWhen = new SayWhen(base.res);
  45                 latitude = Latitude.builder(base.httpTransport,
  46                                                         base.jsonFactory)
  47                         .setHttpRequestInitializer(
  48                                                 base.accessProtectedResource)
  49                         .setApplicationName("WhereAmI/1.0").build();
  50         }
  51
  52         @Override
  53         public final Utterance getResult() {
  54                 try {
  55                         Log.v(TAG, "entering getResult");
  56                         Latitude.CurrentLocation.Get request =
  57                                 latitude.currentLocation().get();
  58                         request.setGranularity("best");
  59                         Location cloc = request.execute();
  60                         Double lat = Double.parseDouble(
  61                                         cloc.getLatitude().toString());
  62                         Double lon = Double.parseDouble(
  63                                         cloc.getLongitude().toString());
  64                         Long tsm = Long.parseLong(
  65                                         cloc.getTimestampMs().toString());
  66                         return new Utterance(true,
  67                                         locationMessage(lat, lon, tsm));
  68                 } catch (GoogleJsonResponseException e) {
  69                         Log.e(TAG, "GoogleJsonResponseException: " + e);
  70                         if (e.getResponse().getStatusCode() == 401) {
  71                                 return new Utterance(false,
  72                                         base.authErrorMessage + "\n" +
  73                                         e.getMessage());
  74                         } else {
  75                                 return new Utterance(false, e.getMessage());
  76                         }
  77                 } catch (HttpResponseException e) {
  78                         Log.e(TAG, "HttpResponseException: " + e);
  79                         return new Utterance(false, e.getMessage());
  80                 } catch (IOException e) {
  81                         Log.e(TAG, "IOException: " + e);
  82                         return new Utterance(false, e.getMessage());
  83                 }
  84         }
  85
  86         private String locationMessage(Double lat, Double lon, Long tsm) {
  87                 Log.v(TAG, "entering locationMessage(" + lat +
  88                                 "," + lon + "," + tsm + ")");
  89                 String locmsg = "<UNSET>";
  90                 String agomsg = "<UNSET>";
  91                 for (int i = 0; i < loc_names.length; i++) {
  92                         Double dist = haversine(lat, lon,
  93                                         Double.parseDouble(loc_lats[i]),
  94                                         Double.parseDouble(loc_lons[i]));
  95                         Log.v(TAG, "Dist from " + loc_names[i] +
  96                                 " is " + dist);
  97                         if ((loc_dists[i] == "0") ||
  98                             (dist < Double.parseDouble(loc_dists[i]))) {
  99                                 locmsg = loc_names[i];
 100                                 break;
 101                         }
 102                 }
 103                 return myname + " " + locmsg + ", " + registered +
 104                         " " + sayWhen.say(tsm);
 105         }
 106
 107         private Double toRad(Double deg) {
 108                 return deg * 3.14159265 / 180;
 109         }
 110
 111         private Double haversine(Double lat1, Double lon1,
 112                                 Double lat2, Double lon2) {
 113                 Double dlat = toRad(lat2 - lat1);
 114                 Double dlon = toRad(lon2 - lon1);
 115                 Double a = Math.sin(dlat / 2) * Math.sin(dlat / 2) +
 116                         Math.sin(dlon / 2) * Math.sin(dlon / 2) *
 117                         Math.cos(toRad(lat1)) * Math.cos(toRad(lat2));
 118                 Double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
 119                 return 6371 * c;
 120         }
 121 }