package cgeo.geocaching.address;
import cgeo.geocaching.location.Geopoint;
import cgeo.geocaching.utils.AndroidRxUtils;
import cgeo.geocaching.utils.Log;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.support.annotation.NonNull;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.Callable;
import io.reactivex.Observable;
import io.reactivex.ObservableSource;
import io.reactivex.Single;
import org.apache.commons.collections4.CollectionUtils;
public class AndroidGeocoder {
private final Geocoder geocoder;
public AndroidGeocoder(final Context context) {
geocoder = new Geocoder(context, Locale.getDefault());
}
/**
* Retrieve addresses from a textual location using Android geocoding API. The work happens on the network
* scheduler.
*
* @param keyword
* the location
* @return an observable containing zero or more locations
*
* @see Geocoder#getFromLocationName(String, int)
*/
public Observable<Address> getFromLocationName(@NonNull final String keyword) {
if (!Geocoder.isPresent()) {
return Observable.error(new RuntimeException("no Android geocoder"));
}
return Observable.defer(new Callable<ObservableSource<? extends Address>>() {
@Override
public Observable<Address> call() {
try {
return addressesToObservable(geocoder.getFromLocationName(keyword, 20));
} catch (final Exception e) {
Log.i("Unable to use Android reverse geocoder: " + e.getMessage());
return Observable.error(e);
}
}
}).subscribeOn(AndroidRxUtils.networkScheduler);
}
/**
* Retrieve the physical address for coordinates. The work happens on the network scheduler.
*
* @param coords the coordinates
* @return a single containing one location or an error
*/
public Single<Address> getFromLocation(@NonNull final Geopoint coords) {
if (!Geocoder.isPresent()) {
return Single.error(new RuntimeException("no Android reverse geocoder"));
}
return Observable.defer(new Callable<Observable<Address>>() {
@Override
public Observable<Address> call() {
try {
return addressesToObservable(geocoder.getFromLocation(coords.getLatitude(), coords.getLongitude(), 1));
} catch (final Exception e) {
Log.i("Unable to use Android reverse geocoder: " + e.getMessage());
return Observable.error(e);
}
}
}).subscribeOn(AndroidRxUtils.networkScheduler).firstOrError();
}
private static Observable<Address> addressesToObservable(final List<Address> addresses) {
return CollectionUtils.isEmpty(addresses) ?
Observable.<Address>error(new RuntimeException("no result from Android geocoder")) :
Observable.fromIterable(addresses);
}
}