public async Task OnLoaded()
{
IsBusy = true;
var navParam = (SnapshotsViewNavParams)NavigationParam;
_groupByCriteria = navParam.GroupByCriteria;
var payload = navParam.SnapshotsIdsource;
Parent = payload;
IEnumerable <LocationSnapshot> snapshots = null;
RaisePropertyChanged(nameof(CanAddSnapshot));
if (payload is Location location)
{
snapshots = await _locationSnapshotDataService.GetSnapshotsByLocationIdAsync(location.Id);
}
else if (payload is SnapshotGroup group)
{
snapshots = await _locationSnapshotDataService.GetSnapshotsByIdsAsync(group.SnapshotIds);
}
var miniatures = await _pictureService.GetSnapshotMiniaturesAsync(snapshots);
foreach (var miniature in miniatures)
{
var thumbnail = await _bitmapConverter.GetBitmapAsync(miniature.Data);
SnapshotThumbnails.Add(new SnapshotThumbnail {
Snapshot = miniature.Snapshot, Thumbnail = thumbnail
});
}
IsBusy = false;
}
private async Task <IEnumerable <SnapshotGroup> > GetSnapshotGroups(GroupByCriteria groupBy)
{
var groupsUrl = await GetGroupsUrl();
groupsUrl = $"{groupsUrl}?groupBy={groupBy.ToString()}";
var result = await _webClient.GetAsync <IEnumerable <SnapshotGroup> >(groupsUrl);
return(result);
}
public async Task <IActionResult> GroupSnapshots(GroupByCriteria groupBy)
{
if (groupBy == GroupByCriteria.None)
{
_logger.LogWarning("Bad request. Invalid group by criteria.");
return(BadRequest());
}
var dataFetchOperation = _locationSnapshotDataService.ChooseGroupByOperation(groupBy);
var snapshotGroups = await dataFetchOperation();
var result = Mapper.Map <IEnumerable <SnapshotGroup>, IEnumerable <SnapshotGroupDto> >(snapshotGroups);
return(Ok(result));
}
public void GroupByTest()
{
var testCriteria = new GroupByCriteria
{
GroupBy = new [] { "Houses.OwnerId", "Houses.Category" },
SelectClause = new SelectClause
{
Select = "Count(1) , Houses.OwnerId , Houses.Category",
IsExpression = true
}
};
var builder = new TestQueryBuilder <GroupByCriteria>(testCriteria);
var query = builder.Build();
Assert.AreEqual(
"Select Count(1) , Houses.OwnerId , Houses.Category from Houses GROUP BY Houses.OwnerId , Houses.Category",
SimplifyString(query.Sql));
}
public Func <Task <IEnumerable <SnapshotGroup> > > ChooseGroupByOperation(GroupByCriteria groupBy)
{
switch (groupBy)
{
case GroupByCriteria.CreatedDate:
return(new Func <Task <IEnumerable <SnapshotGroup> > >(() => GroupSnapshotsByCreatedDateAsync(DateTime.Now)));
case GroupByCriteria.Longitude:
return(new Func <Task <IEnumerable <SnapshotGroup> > >(() => GroupSnapshotsByLongitudeAsync()));
case GroupByCriteria.Latitude:
return(new Func <Task <IEnumerable <SnapshotGroup> > >(() => GroupSnapshotsByLatitudeAsync()));
case GroupByCriteria.Altitude:
return(new Func <Task <IEnumerable <SnapshotGroup> > >(() => GroupSnapshotsByAltitudeAsync()));
default:
throw new ArgumentOutOfRangeException("Could not recognize the specified group by criteria.");
}
}
public Func <Task <IEnumerable <SnapshotGroup> > > ChooseGroupByOperation(GroupByCriteria groupBy)
{
var groups = Task.Run(async() => await GetSnapshotGroups(groupBy).ConfigureAwait(false)).Result;
return(new Func <Task <IEnumerable <SnapshotGroup> > >(() => Task.FromResult(groups)));
}