sharee.bike-App/TINKLib/Services/Geolocation/LastKnownGeolocationService.cs

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2021-05-13 20:03:07 +02:00
using Serilog;
using System;
using System.Threading.Tasks;
using TINK.Model.Device;
using Xamarin.Essentials;
namespace TINK.Model.Services.Geolocation
{
public class LastKnownGeolocationService : IGeolocation
{
/// <summary> Timeout for geolocation request operations.</summary>
private const int GEOLOCATIONREQUEST_TIMEOUT_MS = 5000;
private IGeolodationDependent Dependent { get; }
public LastKnownGeolocationService(IGeolodationDependent dependent)
{
Dependent = dependent;
}
/// <param name="timeStamp">Time when geolocation is of interest. Is used to determine whether cached geoloation can be used or not.</param>
public async Task<Location> GetAsync(DateTime? timeStamp = null)
{
Location location;
try
{
var request = new GeolocationRequest(GeolocationAccuracy.Medium, TimeSpan.FromMilliseconds(GEOLOCATIONREQUEST_TIMEOUT_MS));
location = await Xamarin.Essentials.Geolocation.GetLocationAsync(request);
}
catch (FeatureNotSupportedException fnsEx)
{
// Handle not supported on device exception
Log.ForContext<LastKnownGeolocationService>().Error("Retrieving Geolocation not supported on device. {Exception}", fnsEx);
throw new Exception("Abfrage Standort nicht möglich auf Gerät.", fnsEx);
}
catch (FeatureNotEnabledException fneEx)
{
// Handle not enabled on device exception
Log.ForContext<LastKnownGeolocationService>().Error("Retrieving Geolocation not enabled on device. {Exception}", fneEx);
throw new Exception("Abfrage Standort nicht aktiviert auf Gerät.", fneEx);
}
catch (PermissionException pEx)
{
// Handle permission exception
Log.ForContext<LastKnownGeolocationService>().Error("Retrieving Geolocation not permitted on device. {Exception}", pEx);
throw new Exception("Berechtiung für Abfrage Standort nicht erteilt für App.", pEx);
}
catch (Exception ex)
{
// Unable to get location
Log.ForContext<LastKnownGeolocationService>().Error("Retrieving Geolocation failed. {Exception}", ex);
throw new Exception("Abfrage Standort fehlgeschlagen.", ex);
}
if (location != null // Cached location is available.
&& (timeStamp == null || timeStamp.Value.Subtract(location.Timestamp.DateTime) < MaxAge))
{
// No time stamp available or location not too old.
return location;
}
return await Xamarin.Essentials.Geolocation.GetLocationAsync();
}
/// <summary> If true location data returned is simulated.</summary>
public bool IsSimulation { get => false; }
public TimeSpan MaxAge => new TimeSpan(0, 3, 0);
public bool IsGeolcationEnabled => Dependent.IsGeolcationEnabled;
}
}