private static void ValidateSpec(ISpecification <Forecast> spec)
{
if (spec is null)
{
throw new ArgumentNullException(ErrorMessages.ArgumentNullMessage(nameof(spec)));
}
}
private static void ValidateLocation(string location)
{
if (location is null)
{
throw new ArgumentNullException(ErrorMessages.ArgumentNullMessage(nameof(location)));
}
if (string.IsNullOrEmpty(location))
{
throw new ArgumentException(ErrorMessages.LocationMustNotBeEmptyError);
}
}
private void ValidateEnumerableInput <T>(IEnumerable <T> enumerable, Action <T> validateElementAction)
{
if (enumerable is null)
{
throw new ArgumentNullException(ErrorMessages.ArgumentNullMessage(nameof(enumerable)));
}
if (!enumerable.Any())
{
throw new ArgumentException(ErrorMessages.QueryMustContainAtLeastOneElementError);
}
foreach (var item in enumerable)
{
validateElementAction(item);
}
}
public async Task <IEnumerable <IForecastResult> > GetForecasts(IQuery <string, Forecast> currentQuery)
{
if (currentQuery == null)
{
throw new ArgumentNullException(ErrorMessages.ArgumentNullMessage(nameof(currentQuery)));
}
var tasksToExecute = currentQuery.Queries.Select(queryLocation => UrlProvider.SetLocation(queryLocation).GetUriAsString())
.Select(urlToCall => Client.GetForecastAsync(urlToCall));
var results = await Task.WhenAll(tasksToExecute).ConfigureAwait(false);
return(results.Where(response => response.Any())
.Select(response => response.Single())
.Select(response =>
{
var tempResult = new ForecastResult(response.City.DisplayName);
var Satisfied = response.Forecasts.Where(forecast => currentQuery.IsSatisfiedBy(forecast));
tempResult.AddRange(Satisfied);
return tempResult;
}).
Where(matchedForecast => matchedForecast.ForecastData.Any()) // Filter out, if no match was found
.ToList());
}