/// <summary>
/// Найти заметки
/// </summary>
/// <param name="query">Поисковый запрос</param>
/// <param name="cancelltionToken">Токен отмены операции</param>
/// <returns>Задача, представляющая асинхронный поиск заметок. Результат выполнения - список найденных заметок</returns>
public Task <IReadOnlyList <NoteInfo> > SearchAsync(NoteInfoSearchQuery query, CancellationToken cancelltionToken)
{
if (query == null)
{
throw new ArgumentNullException(nameof(query));
}
cancelltionToken.ThrowIfCancellationRequested();
var search = this.sequenceIndex.AsEnumerable();
if (query.CreatedFrom != null)
{
search = search.Where(note => note.CreatedAt >= query.CreatedFrom.Value);
}
if (query.CreatedTo != null)
{
search = search.Where(note => note.CreatedAt <= query.CreatedTo.Value);
}
if (query.UserId != null)
{
search = search.Where(note => note.UserId == query.UserId.Value);
}
if (query.Favorite != null)
{
search = search.Where(note => note.Favorite = query.Favorite.Value);
}
if (query.Tags != null)
{
bool whereTagsPresent(NoteInfo noteInfo)
{
return(query.Tags.All(tag => noteInfo.Tags.Contains(tag)));
}
search = search.Where(whereTagsPresent);
}
if (query.Offset != null)
{
search = search.Take(query.Offset.Value);
}
if (query.Limit != null)
{
search = search.Take(query.Limit.Value);
}
var sort = query.Sort ?? SortType.Ascending;
var sortBy = query.SortBy ?? NoteSortBy.Creation;
if (sort != SortType.Ascending || sortBy != NoteSortBy.Creation)
{
DateTime select(NoteInfo note)
{
switch (sortBy)
{
case NoteSortBy.LastUpdate:
return(note.LastUpdatedAt);
case NoteSortBy.Creation:
return(note.CreatedAt);
default:
throw new ArgumentException($"Unknown note sort by value \"{sortBy}\".", nameof(query));
}
}
search = sort == SortType.Ascending ?
search.OrderBy(select) :
search.OrderByDescending(select);
}
var result = search.ToList();
return(Task.FromResult <IReadOnlyList <NoteInfo> >(result));
}
public Task <IReadOnlyList <NoteInfo> > SearchAsync(NoteInfoSearchQuery query, CancellationToken cancelltionToken)
{
if (query == null)
{
throw new ArgumentNullException(nameof(query));
}
cancelltionToken.ThrowIfCancellationRequested();
var builder = Builders <Note> .Filter;
var filter = builder.Empty;
if (query.CreatedFrom != null)
{
filter |= builder.Gte("CreatedAt", query.CreatedFrom.Value);
}
if (query.CreatedTo != null)
{
filter |= builder.Lte("CreatedAt", query.CreatedTo.Value);
}
if (query.UserId != null)
{
filter |= builder.Eq("UserId", query.UserId.Value);
}
if (query.Favorite != null)
{
filter |= builder.Eq("Favorite", query.Favorite.Value);
}
var result = notes.Find(filter);
if (query.Offset != null)
{
result = result.Skip(query.Offset.Value);
}
if (query.Limit != null)
{
result = result.Limit(query.Offset.Value);
}
var sort = query.Sort ?? SortType.Ascending;
var sortBy = query.SortBy ?? NoteSortBy.Creation;
if (sort != SortType.Ascending || sortBy != NoteSortBy.Creation)
{
string sortField = "";
switch (sortBy)
{
case NoteSortBy.LastUpdate:
sortField = "LastUpdatedAt";
break;
case NoteSortBy.Creation:
sortField = "CreatedAt";
break;
default:
throw new ArgumentException($"Unknown note sort by value \"{sortBy}\".", nameof(query));
}
var sortDefinition = sort == SortType.Ascending
? new SortDefinitionBuilder <Note>().Ascending(sortField)
: new SortDefinitionBuilder <Note>().Ascending(sortField);
result = result.Sort(sortDefinition);
}
var listResult = result.ToList();
if (query.Tags != null)
{
listResult = listResult
.Where(note => query.Tags.All(tag => note.Tags.Contains(tag)))
.ToList();
}
return(Task.FromResult <IReadOnlyList <NoteInfo> >(listResult));
}