/tests/MongoDB.Driver.Tests/Specifications/crud/AggregateTest.cs

/* Copyright 2010-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

using System.Collections.Generic;
using System.Linq;
using FluentAssertions;
using MongoDB.Bson;
using MongoDB.Driver.Core.Misc;
using MongoDB.Driver.Core.TestHelpers.XunitExtensions;

namespace MongoDB.Driver.Tests.Specifications.crud
{
    public class AggregateTest : CrudOperationWithResultTestBase<List<BsonDocument>>
    {
        private List<BsonDocument> _stages;
        private AggregateOptions _options = new AggregateOptions();

        public override void SkipIfNotSupported(BsonDocument arguments)
        {
            var lastStage = arguments["pipeline"].AsBsonArray.Last().AsBsonDocument;
            var lastStageName = lastStage.GetElement(0).Name;
            if (lastStageName == "$merge")
            {
                RequireServer.Check().Supports(Feature.AggregateMerge);
            }
        }

        protected override bool TrySetArgument(string name, BsonValue value)
        {
            switch (name)
            {
                case "pipeline":
                    _stages = ((BsonArray)value).Cast<BsonDocument>().ToList();
                    return true;
                case "allowDiskUse":
                    _options.AllowDiskUse = value.ToBoolean();
                    return true;
                case "batchSize":
                    _options.BatchSize = (int)value;
                    return true;
                case "collation":
                    _options.Collation = Collation.FromBsonDocument(value.AsBsonDocument);
                    return true;
            }

            return false;
        }

        protected override List<BsonDocument> ConvertExpectedResult(BsonValue expectedResult)
        {
            return ((BsonArray)expectedResult).Select(x => (BsonDocument)x).ToList();
        }

        protected override List<BsonDocument> ExecuteAndGetResult(IMongoDatabase database, IMongoCollection<BsonDocument> collection, bool async)
        {
            if (collection == null)
            {
                if (async)
                {
                    var cursor = database.AggregateAsync<BsonDocument>(_stages, _options).GetAwaiter().GetResult();
                    return cursor.ToListAsync().GetAwaiter().GetResult();
                }
                else
                {
                    return database.Aggregate<BsonDocument>(_stages, _options).ToList();
                }
            }
            else
            {
                if (async)
                {
                    var cursor = collection.AggregateAsync<BsonDocument>(_stages, _options).GetAwaiter().GetResult();
                    return cursor.ToListAsync().GetAwaiter().GetResult();
                }
                else
                {
                    return collection.Aggregate<BsonDocument>(_stages, _options).ToList();
                }
            }
        }

        protected override void VerifyResult(List<BsonDocument> actualResult, List<BsonDocument> expectedResult)
        {
            actualResult.Should().Equal(expectedResult);
        }
    }
}