public async Task <IEnumerable <QuestionDto> > GetQuestions(string examId)
{
var result = new List <QuestionDto>();
var query = new LoadMoreQuery
{
Limit = 100
};
var response = await _service.GetQuestions(examId, query);
while (response.HasMoreData)
{
result.AddRange(response.Items);
query.Offset = response.NextOffset;
response = await _service.GetQuestions(examId, query);
}
result.AddRange(response.Items);
return(result);
}
private async Task LoadMoreExecute(LoadMoreQuery loadMoreQuery)
{
IsLoading = true;
//Simulate Server Call
await Task.Delay(TimeSpan.FromSeconds(2));
Debug.WriteLine("Page Number {0}, Page Size {1}", loadMoreQuery.PageNumber, loadMoreQuery.PageSize);
for (var i = 1; i <= loadMoreQuery.PageSize; i++, _y++)
{
People.Add(new Person
{
FirstName = "John " + _y,
LastName = "Doe",
PhoneNumber = string.Format("(262)564-123{0}", _y),
Address = string.Format("12{0} Lake ave", _y)
});
}
IsLoading = false;
}
public async Task <LoadMoreResult <QuestionDto> > GetQuestions(string examId, LoadMoreQuery query)
{
var examDocRef = db.Collection(_examCollectionName).Document(examId);
var examSnapshot = await examDocRef.GetSnapshotAsync();
ParameterChecker.Against <FileNotFoundException>(examSnapshot.Exists == false, $"Exam {examSnapshot.Id} does not exist!");
var exam = examSnapshot.ConvertTo <Exam>();
var sections = new List <Section>();
Query allSectionsQuery = db.Collection(_examCollectionName).Document(examId).Collection(_sectionCollectionName);
QuerySnapshot allCitiesQuerySnapshot = await allSectionsQuery.GetSnapshotAsync();
foreach (DocumentSnapshot documentSnapshot in allCitiesQuerySnapshot.Documents)
{
var section = documentSnapshot.ConvertTo <Section>();
sections.Add(section);
}
var remain = query.Limit;
var dtos = new List <QuestionDto>();
var currentIndex = 0;
var offsetInExam = query.Offset;
for (int i = 0; i < sections.Count; i++)
{
var section = sections[i];
if (currentIndex < query.Offset)
{
if (currentIndex + section.NumberOfQuestions < query.Offset)
{
currentIndex += section.NumberOfQuestions;
offsetInExam += query.Offset;
continue;
}
else
{
var offsetInSection = query.Offset - currentIndex;
var sectionQuery = new SectionQuery
{
ExamId = exam.Reference.Id,
Section = section,
Offset = offsetInSection,
Limit = remain,
SearchText = query.SearchText
};
var queryResult = await QuerySection(sectionQuery, offsetInExam);
offsetInExam = queryResult.OffsetInExam;
if (queryResult.Items.Any())
{
dtos.AddRange(queryResult.Items);
remain -= queryResult.Items.Count;
}
}
}
else
{
var sectionQuery = new SectionQuery
{
ExamId = exam.Reference.Id,
Section = section,
Offset = 0,
Limit = remain,
SearchText = query.SearchText
};
var queryResult = await QuerySection(sectionQuery, offsetInExam);
offsetInExam = queryResult.OffsetInExam;
if (queryResult.Items.Any())
{
dtos.AddRange(queryResult.Items);
remain -= queryResult.Items.Count;
}
}
if (remain == 0)
{
break;
}
}
return(new LoadMoreResult <QuestionDto>(offsetInExam < exam.NumberOfQuestions, offsetInExam, dtos));
}
public async Task <LoadMoreResult <QuestionDto> > GetQuestions(string examId, LoadMoreQuery query)
{
return(await _service.GetQuestions(examId, query));
}
public Task <LoadMoreResult <QuestionDto> > GetQuestions(string examId, LoadMoreQuery query)
{
throw new NotImplementedException();
}
private bool CanExecuteLoadMore(LoadMoreQuery loadMoreQuery)
{
return(!IsLoading);
}