package org.jboss.errai.demo.grocery.client.local.map;
import com.google.gwt.ajaxloader.client.AjaxLoader;
import com.google.gwt.core.client.Callback;
import com.google.gwt.geolocation.client.Geolocation;
import com.google.gwt.geolocation.client.Position;
import com.google.gwt.geolocation.client.PositionError;
import com.google.gwt.maps.client.base.LatLng;
import javax.inject.Singleton;
/**
* @author edewit@redhat.com
*/
@Singleton
public class LocationProvider {
public void getCurrentPosition(final LocationCallback callback) {
GoogleMapBootstrapper.whenReady(new Runnable() {
@Override
public void run() {
Geolocation geolocation = Geolocation.getIfSupported();
if (geolocation != null) {
geolocation.getCurrentPosition(new Callback<Position, PositionError>() {
@Override
public void onSuccess(Position result) {
callback.onSuccess(convertResult(result));
}
@Override
public void onFailure(PositionError reason) {
// fall back to Google's IP Geolocation
callback.onSuccess(getIpBasedLocation());
}
});
}
}
});
}
public void watchPosition(final LocationCallback callback) {
GoogleMapBootstrapper.whenReady(new Runnable() {
@Override
public void run() {
Geolocation geolocation = Geolocation.getIfSupported();
if (geolocation != null) {
geolocation.watchPosition(new Callback<Position, PositionError>() {
@Override
public void onSuccess(Position result) {
callback.onSuccess(convertResult(result));
}
@Override
public void onFailure(PositionError reason) {
}
});
}
}
});
}
private LatLng convertResult(Position result) {
return LatLng.newInstance(result.getCoordinates().getLatitude(), result.getCoordinates().getLongitude());
}
/**
* Returns Google's guess at the user's physical location based on their IP address.
*/
private static LatLng getIpBasedLocation() {
return LatLng.newInstance(
AjaxLoader.getClientLocation().getLatitude(),
AjaxLoader.getClientLocation().getLongitude());
}
public static abstract class LocationCallback implements Callback<LatLng, PositionError> {
public abstract void onSuccess(LatLng result);
@Override
public void onFailure(PositionError reason) {
throw new IllegalArgumentException("onFailure is not allowed only want success");
}
}
}