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AggregateFacetResults.cs
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AggregateFacetResults.cs
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/* Copyright 2016-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;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using MongoDB.Bson;
using MongoDB.Bson.IO;
using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver.Core.Misc;
namespace MongoDB.Driver
{
/// <summary>
/// Represents the results of a $facet stage with an arbitrary number of facets.
/// </summary>
public class AggregateFacetResults
{
/// <summary>
/// Initializes a new instance of the <see cref="AggregateFacetResults"/> class.
/// </summary>
/// <param name="facets">The facets.</param>
public AggregateFacetResults(AggregateFacetResult[] facets)
{
Facets = Ensure.IsNotNull(facets, nameof(facets));
}
/// <summary>
/// Gets the facets.
/// </summary>
public IReadOnlyList<AggregateFacetResult> Facets { get; private set; }
}
internal class AggregateFacetResultsSerializer : SerializerBase<AggregateFacetResults>
{
private readonly string[] _names;
private readonly IBsonSerializer[] _serializers;
public AggregateFacetResultsSerializer(IEnumerable<string> names, IEnumerable<IBsonSerializer> serializers)
{
_names = names.ToArray();
_serializers = serializers.ToArray();
}
public override AggregateFacetResults Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
{
var facets = new AggregateFacetResult[_names.Length];
var reader = context.Reader;
reader.ReadStartDocument();
while (reader.ReadBsonType() != 0)
{
var name = reader.ReadName();
var index = Array.IndexOf(_names, name);
if (index != -1)
{
var itemSerializer = _serializers[index];
var itemType = itemSerializer.ValueType;
var itemSerializerType = typeof(IBsonSerializer<>).MakeGenericType(itemType);
var arraySerializerType = typeof(ArraySerializer<>).MakeGenericType(itemType);
var arraySerializerConstructor = arraySerializerType.GetTypeInfo().GetConstructor(new[] { itemSerializerType });
var arraySerializer = (IBsonSerializer)arraySerializerConstructor.Invoke(new object[] { itemSerializer });
var output = (Array)arraySerializer.Deserialize(context);
var facetType = typeof(AggregateFacetResult<>).MakeGenericType(itemType);
var ienumerableItemType = typeof(IEnumerable<>).MakeGenericType(itemType);
var facetConstructor = facetType.GetTypeInfo().GetConstructor(new[] { typeof(string), ienumerableItemType });
var facet = (AggregateFacetResult)facetConstructor.Invoke(new object[] { name, output });
facets[index] = facet;
}
else
{
throw new BsonSerializationException($"Unexpected field name '{name}' in $facet result.");
}
}
reader.ReadEndDocument();
var missingIndex = Array.IndexOf(facets, null);
if (missingIndex != -1)
{
var missingName = _names[missingIndex];
throw new BsonSerializationException($"Field name '{missingName}' in $facet result.");
}
return new AggregateFacetResults(facets);
}
}
}