public Task<List<SerializableDynamicObject>> GetDataAsync(Query query)
{
var request = new GetDataRequest
{
Query = query
};
return _requestTask.Get(request)
.Select(x => x.Results.ToList(), _scheduler.Task.TPL);
}
public void ProductEntityGroupByProductName()
{
// new(Key.ProductName as ProductName,
// Sum(UnitPrice) as UnitPrice,
// Sum(UnitsInStock) as UnitsInStock,
// Sum(UnitsOnOrder) as UnitsOnOrder,
// Sum(ReorderLevel) as ReorderLevel
var entity = new Entity("Products");
var dimension = new Dimension("ProductName");
entity.Dimensions.Add(dimension);
entity.Measures.Add(new Measure("UnitPrice"));
entity.Measures.Add(new Measure("UnitsInStock"));
entity.Measures.Add(new Measure("UnitsOnOrder"));
entity.Measures.Add(new Measure("ReorderLevel"));
var query = new Query
{
DataSource = new DataSource {Name = "Northwind"},
Entity = entity,
GroupingDimensions = new[] {dimension},
};
var entityFrameworkQueryExecutor = new EntityFrameworkQueryExecutor().Execute(new MyDbContext(), query);
}
public List<SerializableDynamicObject> Execute(DbContext dbContext, Query query)
{
var results = new List<SerializableDynamicObject>();
using (var context = dbContext)
{
context.Database.Log = s => Console.WriteLine(string.Format("EFApp : {0}", s));
var entityProperty = context.GetType()
.GetProperties()
.FirstOrDefault(x => x.Name == query.Entity.Name);
if (entityProperty == null)
{
return results;
}
var entity = entityProperty.GetValue(context, null) as IQueryable;
if (entity == null)
{
return results;
}
var data = entity;
if (query.Filters.Any())
{
data = ExecuteWhere(data, query);
}
var keySelector = BuildKeySelector(query);
var selector = BuildSelector(query);
data = data
.GroupBy(keySelector, "it")
.Select(selector);
var groupingDimensionProperties = new Dictionary<Dimension, PropertyInfo>();
var measureProperties = new Dictionary<Measure, PropertyInfo>();
// To enable original order to be reserved
long recordIndex = 0;
foreach (var record in data)
{
if (!groupingDimensionProperties.Any() && !measureProperties.Any())
{
var type = record.GetType();
var properties = type.GetProperties();
foreach (var dimension in query.GroupingDimensions)
{
groupingDimensionProperties.Add(dimension, properties.Single(x => x.Name == dimension.Name));
}
foreach (var measure in query.Entity.Measures)
{
measureProperties.Add(measure, properties.Single(x => x.Name == measure.Name));
}
}
var result = new SerializableDynamicObject();
foreach (var groupingDimensionProperty in groupingDimensionProperties)
{
result.SetValue(groupingDimensionProperty.Key.Name, groupingDimensionProperty.Value.GetValue(record, null));
}
foreach (var measureProperty in measureProperties)
{
result.SetValue(measureProperty.Key.Name, measureProperty.Value.GetValue(record, null));
}
result.SetValue("RecordIndex", recordIndex);
recordIndex++;
results.Add(result);
}
}
return results;
}
private static IQueryable ExecuteWhere(IQueryable data, Query query)
{
var result = data;
foreach (var filter in query.Filters)
{
result = data.Where(string.Format("{0} {1} @0",
filter.Dimension.Name,
GetFilterOperator(filter.Operator)),
filter.Value);
}
return result;
}
private static string BuildSelector(Query query)
{
var groupingDimensionSelector =
string.Join(",", query.GroupingDimensions.Select(x => string.Format("Key.{0} as {0}", x.Name)));
var measureSelector = string.Join(",",
query.Entity.Measures.Select(x => string.Format("Sum({0}) as {0}", x.Name)));
var selectorBuilder = new StringBuilder();
selectorBuilder.Append("new(");
selectorBuilder.Append(groupingDimensionSelector);
if (query.Entity.Measures.Any())
{
selectorBuilder.Append(",");
selectorBuilder.Append(measureSelector);
}
selectorBuilder.Append(")");
var selector = selectorBuilder.ToString();
return selector;
}
private static string BuildKeySelector(Query query)
{
var groupingDimensionKeySelector =
string.Join(", ",
query.GroupingDimensions.Select(x => string.Format("{0}", x.Name)));
var keySelectorBuilder = new StringBuilder();
keySelectorBuilder.Append("new(");
keySelectorBuilder.Append(groupingDimensionKeySelector);
keySelectorBuilder.Append(")");
var keySelector = keySelectorBuilder.ToString();
return keySelector;
}
public ExplorerViewModel(ILog log, IDispatcherSchedulerProvider scheduler, IStandardDialog standardDialog,
IExplorerService service,
DataSourceSelectorViewModel dataSourceSelectorViewModel,
SearchViewModel searchViewModel,
DataViewModel dataViewModel,
FilterViewModel filterViewModel,
PathViewModel pathViewModel,
Func<PathItemViewModel> pathItemViewModelFactory)
: base(log, scheduler, standardDialog)
{
_service = service;
_pathItemViewModelFactory = pathItemViewModelFactory;
Disposables.Add(service);
this.SetupHeader(Scheduler, "Explorer");
DataSourceSelectorViewModel = dataSourceSelectorViewModel;
this.SyncViewModelActivationStates(DataSourceSelectorViewModel).AddDisposable(Disposables);
this.SyncViewModelBusy(DataSourceSelectorViewModel).AddDisposable(Disposables);
SearchViewModel = searchViewModel;
this.SyncViewModelActivationStates(SearchViewModel).AddDisposable(Disposables);
this.SyncViewModelBusy(SearchViewModel).AddDisposable(Disposables);
DataViewModel = dataViewModel;
this.SyncViewModelActivationStates(DataViewModel).AddDisposable(Disposables);
this.SyncViewModelBusy(DataViewModel).AddDisposable(Disposables);
FilterViewModel = filterViewModel;
this.SyncViewModelActivationStates(FilterViewModel).AddDisposable(Disposables);
this.SyncViewModelBusy(FilterViewModel).AddDisposable(Disposables);
PathViewModel = pathViewModel;
this.SyncViewModelActivationStates(PathViewModel).AddDisposable(Disposables);
this.SyncViewModelBusy(PathViewModel).AddDisposable(Disposables);
// When the selected DataSource changes, keep the Search upto date.
DataSourceSelectorViewModel.DataSources.SelectedItemChanged
.Where(x => x != null)
.SelectMany(dataSource => SearchViewModel.Reset(dataSource).ToObservable())
.TakeUntil(ClosingStrategy.Closed)
.Subscribe(_ => { });
// When the selected Dimension changes, create a new root level path node with the correct query.
SearchViewModel.Dimension.SelectedItemChanged
.Where(x => x != null)
.TakeUntil(ClosingStrategy.Closed)
.ObserveOn(Scheduler.Dispatcher.RX)
.Subscribe(_ =>
{
var query = new Query
{
DataSource = DataSourceSelectorViewModel.DataSources.SelectedItem,
Entity = SearchViewModel.Entity.SelectedItem,
GroupingDimensions = new[] {SearchViewModel.Dimension.SelectedItem},
ParentQuery = null
};
var pathItem = _pathItemViewModelFactory();
pathItem.DisplayText = query.GroupingDimensions.First().Name;
pathItem.Query = query;
PathViewModel.Path.Items.Add(pathItem);
PathViewModel.Path.SelectedItem = pathItem;
});
// When a DrillDownDimensionRequest is recieved, create a new path node under the currectly selected
// node.
DataViewModel.DrillDownDimensionRequest
.Where(x => x != null)
.TakeUntil(ClosingStrategy.Closed)
.ObserveOn(Scheduler.Dispatcher.RX)
.Subscribe(query =>
{
var pathItem = _pathItemViewModelFactory();
pathItem.DisplayText = query.GroupingDimensions.First().Name;
pathItem.Query = query;
PathViewModel.Path.SelectedItem.AddChild(pathItem);
PathViewModel.Path.SelectedItem = pathItem;
});
// As the SelectedPathItem changes, keep the Data upto date.
PathViewModel.Path.SelectedItemChanged
.Where(x => x != null)
.SelectMany(x => GetData(x.Query))
.TakeUntil(ClosingStrategy.Closed)
.Subscribe(_ => { });
}
private IObservable<Query> GetData(Query query)
{
var dimensionsAvailable = SearchViewModel.Entity.SelectedItem.Dimensions
.Except(GetExistingQueryDimensions(query))
.ToList();
return DataViewModel.Reset(query, dimensionsAvailable).ToObservable();
}
private static IEnumerable<Dimension> GetExistingQueryDimensions(Query query)
{
var results = query.GroupingDimensions.AsEnumerable();
if (query.ParentQuery != null)
{
results = results.Concat(GetExistingQueryDimensions(query.ParentQuery));
}
return results;
}
private Task SetupContextMenu(Query query, IEnumerable<Dimension> dimensionsAvailable)
{
// Only show Dimensions that haven't been grouped by.
var dimensionContextMenuItems = dimensionsAvailable
.Where(x => !query.GroupingDimensions.Contains(x))
.Select(x =>
new ContextMenuButtonItem(Scheduler)
{
DisplayName = x.Name,
Command = new DelegateCommand(
() =>
{
var selectedDimension = dimensionsAvailable
.SingleOrDefault(d => d.Name == x.Name);
if (selectedDimension == null)
{
return;
}
//var selectedItem = Items[SelectedItemIndex];
var newFilter = query.GroupingDimensions
.Select(d => new Nitrogen.Common.DataExplorer.Filter
{
Dimension = d,
Operator = FilterOperator.Equals,
Value = SelectedItem[d.Name]
})
.ToList();
var newQuery = query.DrillDown(new[] {selectedDimension}, newFilter);
_drillDownDimensionRequest.OnNext(newQuery);
})
});
return ContextMenu.AddRangeAsync(dimensionContextMenuItems);
}
public Task<Query> Reset(Query query, IEnumerable<Dimension> dimensionsAvailable)
{
return ContextMenu.ClearAsync()
.Then(() => SetupContextMenu(query, dimensionsAvailable), Scheduler.Task.TPL)
.Then(() => _service.GetDataAsync(query), Scheduler.Task.TPL)
.Then(data =>
{
// TODO : This is not great. Change grid to support CollectionChanges
Columns = null;
Items = null;
if (!data.Any())
{
return query;
}
var records = TransformSerializableDynamicObjectToDictionary(data);
var items = _itemsCollectionFactory();
items.AddRange(records);
Items = items;
var columns = _columnCollectionFactory();
columns.AddRange(GetColumns(records));
Columns = columns;
return query;
}, Scheduler.Dispatcher.TPL);
}
