public void ParseParamenters(string methodString)
{
string[] res = null;
"Do parsing".When(() => res = AggregationImplementationBase.GetAggregationParams(methodString));
"check results".Then(() => res.Count().Should().Be(3));
"check results".Then(() => res.First().Should().Be("a"));
"check results".Then(() => res.Last().Should().Be("c"));
}
/// <summary>
/// Execute the apply query to the given IQueryable.
/// </summary>
/// <remarks>
/// The <see cref="ODataQuerySettings.HandleNullPropagation"/> property specifies
/// how this method should handle null propagation.
/// </remarks>
/// <param name="query">The original <see cref="IQueryable"/>.</param>
/// <param name="querySettings">The <see cref="ODataQuerySettings"/> that contains all the query application related settings.</param>
/// <param name="assembliesResolver">IAssembliesResolver provided by the framework.</param>
/// <param name="aggregationWindowSize">The max number of results to aggregate in each aggregation batch</param>
/// <returns>The new <see cref="IQueryable"/> After the apply query has been applied to.</returns>
public IQueryable ApplyTo(IQueryable query, ODataQuerySettings querySettings, IAssembliesResolver assembliesResolver, int aggregationWindowSize)
{
if (query == null)
{
throw Error.ArgumentNull("query");
}
if (querySettings == null)
{
throw Error.ArgumentNull("querySettings");
}
if (Context.ElementClrType == null)
{
throw Error.NotSupported(SRResources.ApplyToOnUntypedQueryOption, "ApplyTo");
}
ApplyClause applyClause = ApplyClause;
Contract.Assert(applyClause != null);
// Ensure we have decided how to handle null propagation
ODataQuerySettings updatedSettings = querySettings;
if (querySettings.HandleNullPropagation == HandleNullPropagationOption.Default)
{
updatedSettings = new ODataQuerySettings(updatedSettings);
updatedSettings.HandleNullPropagation = HandleNullPropagationOption.False;
}
var maxResults = querySettings.PageSize ?? 2000;
if (aggregationWindowSize != 0)
{
maxResults = (aggregationWindowSize < MAX_AGGREGATION_WINDOW_SIZE)
? aggregationWindowSize
: MAX_AGGREGATION_WINDOW_SIZE;
}
// Call InterceptingProvider.Intercept that will create a new <see cref="InterceptingProvider"/> and set its visitors.
// InterceptingProvider will wrap the actual IQueryable to implement unsupported operations in memory.
var mi = _intercept_mi.MakeGenericMethod(this.Context.ElementClrType);
IQueryable results = mi.Invoke(null, new object[] { query, maxResults, null }) as IQueryable;
// Each transformation is the input for the next transformation in the transformations list
foreach (var transformation in applyClause.Transformations)
{
switch (transformation.Item1)
{
case "aggregate":
ApplyAggregateClause aggregateClause = transformation.Item2 as ApplyAggregateClause;
if (aggregateClause == null)
{
throw Error.Argument("aggregation transformation type mismatch", transformation.Item2);
}
LambdaExpression propertyToAggregateExpression = FilterBinder.Bind(aggregateClause.AggregatablePropertyExpression, Context.ElementClrType, Context.Model, assembliesResolver, updatedSettings);
var aggregationImplementation = AggregationMethodsImplementations.GetAggregationImplementation(aggregateClause.AggregationMethod);
if (results.Provider is InterceptingProvider)
{
(results.Provider as InterceptingProvider).Combiner =
aggregationImplementation.CombineTemporaryResults;
}
IQueryable queryToUse = results;
if (aggregateClause.AggregatableProperty.Contains('/'))
{
queryToUse = AggregationImplementationBase.FilterNullValues(query, this.Context.ElementClrType, aggregateClause);
}
var projectionLambda = AggregationImplementationBase.GetProjectionLambda(this.Context.ElementClrType, aggregateClause, propertyToAggregateExpression);
string[] aggregationParams = AggregationImplementationBase.GetAggregationParams(aggregateClause.AggregationMethod);
var aggragationResult = aggregationImplementation.DoAggregatinon(this.Context.ElementClrType, queryToUse, aggregateClause, projectionLambda, aggregationParams);
var aliasType = aggregationImplementation.GetResultType(this.Context.ElementClrType, aggregateClause);
results = this.ProjectResult(aggragationResult, aggregateClause.Alias, aliasType);
Context = new ODataQueryContext(this.Context.Model, results.ElementType);
break;
case "groupby":
IEnumerable <LambdaExpression> propertiesToGroupByExpressions = null;
var groupByImplementation = new GroupByImplementation()
{
Context = this.Context
};
var groupByClause = transformation.Item2 as ApplyGroupbyClause;
if (groupByClause == null)
{
throw Error.Argument("aggregation transformation type mismatch", transformation.Item2);
}
var entityParam = Expression.Parameter(this.Context.ElementClrType, "$it");
if (groupByClause.SelectedPropertiesExpressions != null)
{
propertiesToGroupByExpressions =
groupByClause.SelectedPropertiesExpressions.Select(
exp =>
FilterBinder.Bind(
exp, this.Context.ElementClrType, this.Context.Model, assembliesResolver, updatedSettings, entityParam));
}
var keyType = groupByImplementation.GetGroupByKeyType(groupByClause);
if (groupByClause.Aggregate == null)
{
// simple group-by without aggregation method
results = groupByImplementation.DoGroupBy(results, maxResults, groupByClause, keyType, propertiesToGroupByExpressions);
}
else
{
IQueryable keys = null;
propertyToAggregateExpression = FilterBinder.Bind(groupByClause.Aggregate.AggregatablePropertyExpression, Context.ElementClrType, Context.Model, assembliesResolver, updatedSettings);
object[] aggragatedValues = null;
groupByImplementation.DoAggregatedGroupBy(results, maxResults, groupByClause, keyType, propertiesToGroupByExpressions, propertyToAggregateExpression,
out keys, out aggragatedValues);
results = ProjectGroupedResult(groupByClause, keys, aggragatedValues, keyType, Context);
}
Context = new ODataQueryContext(this.Context.Model, results.ElementType);
break;
case "filter":
var filterClause = transformation.Item2 as ApplyFilterClause;
if (filterClause == null)
{
throw Error.Argument("aggregation transformation type mismatch", transformation.Item2);
}
var filterImplementation = new FilterImplementation()
{
Context = this.Context
};
results = filterImplementation.DoFilter(results, filterClause, querySettings, this._queryOptionParser);
break;
default:
throw Error.NotSupported("aggregation not supported", transformation.Item1);
}
}
object convertedResult = null;
return(results);
}