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SerializeAsNominalTypeSerializer.cs
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SerializeAsNominalTypeSerializer.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;
namespace MongoDB.Bson.Serialization.Serializers
{
/// <summary>
/// Represents a serializer for a class that will be serialized as if it were one of its base classes.
/// </summary>
/// <typeparam name="TActualType">The actual type.</typeparam>
/// <typeparam name="TNominalType">The nominal type.</typeparam>
public class SerializeAsNominalTypeSerializer<TActualType, TNominalType> : SerializerBase<TActualType> where TActualType : class, TNominalType
{
// private fields
private readonly Lazy<IBsonSerializer<TNominalType>> _lazyNominalTypeSerializer;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="SerializeAsNominalTypeSerializer{TActualType, TNominalType}"/> class.
/// </summary>
public SerializeAsNominalTypeSerializer()
: this(BsonSerializer.SerializerRegistry)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SerializeAsNominalTypeSerializer{TActualType, TNominalType}"/> class.
/// </summary>
/// <param name="nominalTypeSerializer">The base class serializer.</param>
public SerializeAsNominalTypeSerializer(IBsonSerializer<TNominalType> nominalTypeSerializer)
{
if (nominalTypeSerializer == null)
{
throw new ArgumentNullException("nominalTypeSerializer");
}
_lazyNominalTypeSerializer = new Lazy<IBsonSerializer<TNominalType>>(() => nominalTypeSerializer);
}
/// <summary>
/// Initializes a new instance of the <see cref="SerializeAsNominalTypeSerializer{TActualType, TNominalType}" /> class.
/// </summary>
/// <param name="serializerRegistry">The serializer registry.</param>
public SerializeAsNominalTypeSerializer(IBsonSerializerRegistry serializerRegistry)
{
if (serializerRegistry == null)
{
throw new ArgumentNullException("serializerRegistry");
}
_lazyNominalTypeSerializer = new Lazy<IBsonSerializer<TNominalType>>(() => serializerRegistry.GetSerializer<TNominalType>());
}
// public methods
/// <summary>
/// Serializes a value.
/// </summary>
/// <param name="context">The serialization context.</param>
/// <param name="args">The serialization args.</param>
/// <param name="value">The value.</param>
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, TActualType value)
{
if (value == null)
{
var bsonWriter = context.Writer;
bsonWriter.WriteNull();
}
else
{
args.NominalType = typeof(TNominalType);
args.SerializeAsNominalType = true;
_lazyNominalTypeSerializer.Value.Serialize(context, args, value);
}
}
}
}