/// <summary>
/// Returns a result for a single ID from the GW2 API for the specified resource.
/// </summary>
/// <typeparam name="R">The result type that query results from the GW2 API are to be filtered into.</typeparam>
/// <typeparam name="E">The entity type that is to be used to save the result data to the SQL database.</typeparam>
/// <param name="client">The HTTP client used to interact with the GW2 API.</param>
/// <param name="resource">The type of resource to get data for.</param>
/// <param name="id">The ID of the result to be retrieved.</param>
/// <returns>A result for a single ID from the GW2 API for the specified resource.</returns>
private Entity GetSingleResult <R, E>(APIResource resource, int id)
where R : APIDataResult <E>
where E : Entity
{
var baseURL = Settings.Default.APIBaseURL;
var listURL = $"{baseURL}/{resource.GetPath()}";
var singleResultURL = $"{listURL}/{id}";
var retryCount = 0;
while (retryCount < this._maxRetryCount)
{
var singleResultResponse = this._httpClient.GetAsync(singleResultURL).Result;
if (singleResultResponse.IsSuccessStatusCode)
{
Debug.WriteLine($"Resource : {resource} | ID : {id} | Retry Count : {retryCount}");
return(singleResultResponse.Content.ReadAsAsync <R>().Result.ToEntity());
}
if (singleResultResponse.ReasonPhrase == "Not Found")
{
return(null);
}
retryCount += 1;
}
return(null);
}
/// <summary>
/// Returns a complete list of all possible IDs for the specified resource.
/// </summary>
/// <typeparam name="E">The entity type that is to be used to save the result data to the SQL database.</typeparam>
/// <param name="client">The HTTP client used to interact with the GW2 API.</param>
/// <param name="resource">The type of resource to get data for.</param>
/// <param name="targetDataSet">The dataset containing entities to be populated from results from the GW2 API.</param>
/// <returns>A complete list of all possible IDs for the specified resource.</returns>
private IEnumerable <int> GetIds <E>(APIResource resource, DbSet <E> targetDataSet)
where E : Entity
{
var baseURL = Settings.Default.APIBaseURL;
var listURL = $"{baseURL}/{resource.GetPath()}";
var response = this._httpClient.GetAsync(listURL).Result;
if (!response.IsSuccessStatusCode)
{
return(null);
}
var queryableDbSet = (IQueryable <Entity>)targetDataSet;
var existingIds = queryableDbSet.Select(row => row.APIID)
.OrderBy(id => id)
.ToList();
var newIds = response.Content.ReadAsAsync <List <int> >().Result;
return(newIds.Except(existingIds));
}
