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ElementAppendingSerializer.cs
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ElementAppendingSerializer.cs
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/* Copyright 2017-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 MongoDB.Bson.IO;
namespace MongoDB.Bson.Serialization.Serializers
{
/// <summary>
/// A serializer that serializes a document and appends elements to the end of it.
/// </summary>
/// <typeparam name="TDocument">The type of the document.</typeparam>
/// <seealso cref="MongoDB.Bson.Serialization.IBsonSerializer{TDocument}" />
public class ElementAppendingSerializer<TDocument> : IBsonSerializer<TDocument>
{
// private fields
private readonly IBsonSerializer<TDocument> _documentSerializer;
private readonly List<BsonElement> _elements;
private readonly Action<BsonWriterSettings> _writerSettingsConfigurator;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="ElementAppendingSerializer{TDocument}" /> class.
/// </summary>
/// <param name="documentSerializer">The document serializer.</param>
/// <param name="elements">The elements to append.</param>
/// <param name="writerSettingsConfigurator">The writer settings configurator.</param>
public ElementAppendingSerializer(
IBsonSerializer<TDocument> documentSerializer,
IEnumerable<BsonElement> elements,
Action<BsonWriterSettings> writerSettingsConfigurator = null)
{
if (documentSerializer == null) { throw new ArgumentNullException(nameof(documentSerializer)); }
if (elements == null) { throw new ArgumentNullException(nameof(elements)); }
_documentSerializer = documentSerializer;
_elements = elements.ToList();
_writerSettingsConfigurator = writerSettingsConfigurator; // can be null
}
// public properties
/// <inheritdoc />
public Type ValueType => typeof(TDocument);
// public methods
/// <inheritdoc />
public TDocument Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
{
throw new NotSupportedException();
}
object IBsonSerializer.Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
{
throw new NotSupportedException();
}
/// <inheritdoc />
public void Serialize(BsonSerializationContext context, BsonSerializationArgs args, TDocument value)
{
var writer = context.Writer;
var elementAppendingWriter = new ElementAppendingBsonWriter(writer, _elements, _writerSettingsConfigurator);
var elementAppendingContext = BsonSerializationContext.CreateRoot(elementAppendingWriter, builder => ConfigureElementAppendingContext(builder, context));
_documentSerializer.Serialize(elementAppendingContext, args, value);
}
void IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, object value)
{
Serialize(context, args, (TDocument)value);
}
// private methods
private void ConfigureElementAppendingContext(BsonSerializationContext.Builder builder, BsonSerializationContext originalContext)
{
builder.IsDynamicType = originalContext.IsDynamicType;
}
}
}