public static Connection <U> GetPagedResults <T, U>(this ResolveConnectionContext <T> context, StarWarsData data, List <string> ids) where U : StarWarsCharacter
{
List <string> idList;
List <U> list;
string cursor;
string endCursor;
var pageSize = context.PageSize ?? 20;
if (context.IsUnidirectional || context.After != null || context.Before == null)
{
if (context.After != null)
{
idList = ids
.SkipWhile(x => !Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(x)).Equals(context.After))
.Take(context.First ?? pageSize).ToList();
}
else
{
idList = ids
.Take(context.First ?? pageSize).ToList();
}
}
else
{
if (context.Before != null)
{
idList = ids.Reverse <string>()
.SkipWhile(x => !Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(x)).Equals(context.Before))
.Take(context.Last ?? pageSize).ToList();
}
else
{
idList = ids.Reverse <string>()
.Take(context.Last ?? pageSize).ToList();
}
}
list = data.GetCharactersAsync(idList).Result as List <U>;
cursor = list.Count > 0 ? list.Last().Cursor : null;
endCursor = ids.Count > 0 ? Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(ids.Last())) : null;
return(new Connection <U>
{
Edges = list.Select(x => new Edge <U>()
{
Cursor = x.Cursor, Node = x
}).ToList(),
TotalCount = list.Count,
PageInfo = new PageInfo()
{
EndCursor = endCursor,
HasNextPage = endCursor == null ? false : !cursor.Equals(endCursor)
}
});
}
