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

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using Serilog;
using System;
using System.Threading;
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using System.Threading.Tasks;
using TINK.Model.Device;
using Xamarin.Essentials;
namespace TINK.Model.Services.Geolocation
{
public class LastKnownGeolocationService : IGeolocation
{
private IGeolodationDependent Dependent { get; }
public LastKnownGeolocationService(IGeolodationDependent dependent)
{
Dependent = dependent;
}
/// <summary> Gets the current location.</summary>
/// <param name="cancelationToken">Token to cancel request for geolocation.</param>
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/// <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(CancellationToken? cancelationToken = null, DateTime? timeStamp = null)
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{
Location location;
try
{
location = await Xamarin.Essentials.Geolocation.GetLastKnownLocationAsync();
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}
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 new GeolocationService(Dependent).GetAsync(cancelationToken, timeStamp);
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}
/// <summary> If true location data returned is simulated.</summary>
public bool IsSimulation { get => false; }
/// <summary> Maximum age allowed for location info. </summary>
public TimeSpan MaxAge => new TimeSpan(0, 3 /*minutes*/, 0);
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public bool IsGeolcationEnabled => Dependent.IsGeolcationEnabled;
}
}