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ProjectingDeserializer.cs
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ProjectingDeserializer.cs
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/* 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;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Serializers;
namespace MongoDB.Bson.Serialization.Serializers
{
/// <summary>
/// Wraps a serializer and projects using a function.
/// </summary>
/// <typeparam name="TFrom">The type of from.</typeparam>
/// <typeparam name="TTo">The type of to.</typeparam>
public class ProjectingDeserializer<TFrom, TTo> : SerializerBase<TTo>
{
// private fields
private readonly IBsonSerializer<TFrom> _fromSerializer;
private readonly Func<TFrom, TTo> _projector;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="ProjectingDeserializer{TFrom, TTo}"/> class.
/// </summary>
/// <param name="fromSerializer">From serializer.</param>
/// <param name="projector">The projector.</param>
public ProjectingDeserializer(IBsonSerializer<TFrom> fromSerializer, Func<TFrom, TTo> projector)
{
_fromSerializer = fromSerializer;
_projector = projector;
}
/// <summary>
/// Deserializes a value.
/// </summary>
/// <param name="context">The deserialization context.</param>
/// <param name="args">The deserialization args.</param>
/// <returns>A deserialized value.</returns>
public override TTo Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
{
var from = _fromSerializer.Deserialize(context);
return _projector(from);
}
}
}