public override string ToString()
{
var sb = new StringBuilder("aggregate([");
if (_stages.Count > 0)
{
var pipeline = new PipelineStagePipelineDefinition <TDocument, TResult>(_stages);
var renderedPipeline = pipeline.Render(_collection.DocumentSerializer, _collection.Settings.SerializerRegistry);
sb.Append(string.Join(", ", renderedPipeline.Documents.Select(x => x.ToString())));
}
sb.Append("])");
return(sb.ToString());
}
public override IOrderedAggregateFluent <TResult> ThenBy(SortDefinition <TResult> newSort)
{
Ensure.IsNotNull(newSort, nameof(newSort));
var stages = _pipeline.Stages.ToList();
var oldSortStage = (SortPipelineStageDefinition <TResult>)stages[stages.Count - 1];
var oldSort = oldSortStage.Sort;
var combinedSort = Builders <TResult> .Sort.Combine(oldSort, newSort);
var combinedSortStage = PipelineStageDefinitionBuilder.Sort(combinedSort);
stages[stages.Count - 1] = combinedSortStage;
var newPipeline = new PipelineStagePipelineDefinition <TDocument, TResult>(stages);
return((IOrderedAggregateFluent <TResult>)WithPipeline(newPipeline));
}
private PipelineDefinition <TDocument, TResult> CreateFilteredPipeline <TResult>(PipelineDefinition <TDocument, TResult> pipeline)
{
const string matchOperatorName = "$match";
var filterStage = new DelegatedPipelineStageDefinition <TDocument, TDocument>(
matchOperatorName,
(s, sr) =>
{
var renderedFilter = _filter.Render(s, sr);
return(new RenderedPipelineStageDefinition <TDocument>(matchOperatorName, new BsonDocument(matchOperatorName, renderedFilter), s));
});
var filterPipeline = new PipelineStagePipelineDefinition <TDocument, TDocument>(new[] { filterStage });
var combinedPipeline = new CombinedPipelineDefinition <TDocument, TDocument, TResult>(
filterPipeline,
pipeline);
return(new OptimizingPipelineDefinition <TDocument, TResult>(combinedPipeline));
}
// public methods
public override Task <IAsyncCursor <TResult> > AggregateAsync <TResult>(PipelineDefinition <TDocument, TResult> pipeline, AggregateOptions options = null, CancellationToken cancellationToken = default(CancellationToken))
{
const string matchOperatorName = "$match";
var filterStage = new DelegatedPipelineStageDefinition <TDocument, TDocument>(
matchOperatorName,
(s, sr) =>
{
var renderedFilter = _filter.Render(s, sr);
return(new RenderedPipelineStageDefinition <TDocument>(matchOperatorName, new BsonDocument(matchOperatorName, renderedFilter), s));
});
var filterPipeline = new PipelineStagePipelineDefinition <TDocument, TDocument>(new[] { filterStage });
var combinedPipeline = new CombinedPipelineDefinition <TDocument, TDocument, TResult>(
filterPipeline,
pipeline);
var optimizedPipeline = new OptimizingPipelineDefinition <TDocument, TResult>(combinedPipeline);
return(_wrappedCollection.AggregateAsync(optimizedPipeline, options, cancellationToken));
}
public override Task <IAsyncCursor <TResult> > ToCursorAsync(CancellationToken cancellationToken)
{
var pipeline = new PipelineStagePipelineDefinition <TDocument, TResult>(_stages);
return(_collection.AggregateAsync(pipeline, _options, cancellationToken));
}