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TypeMappingSerializationProvider.cs
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TypeMappingSerializationProvider.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.Concurrent;
using System.Reflection;
namespace MongoDB.Bson.Serialization
{
/// <summary>
/// Represents a serialization provider based on a mapping from value types to serializer types.
/// </summary>
public sealed class TypeMappingSerializationProvider : BsonSerializationProviderBase
{
// private fields
private readonly ConcurrentDictionary<Type, Type> _serializerTypes;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="TypeMappingSerializationProvider"/> class.
/// </summary>
public TypeMappingSerializationProvider()
{
_serializerTypes = new ConcurrentDictionary<Type, Type>();
}
// public methods
/// <inheritdoc/>
public override IBsonSerializer GetSerializer(Type type, IBsonSerializerRegistry serializerRegistry)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
var typeInfo = type.GetTypeInfo();
if (typeInfo.IsGenericType && typeInfo.ContainsGenericParameters)
{
var message = string.Format("Generic type {0} has unassigned type parameters.", BsonUtils.GetFriendlyTypeName(type));
throw new ArgumentException(message, "type");
}
Type serializerType;
if (_serializerTypes.TryGetValue(type, out serializerType))
{
return CreateSerializer(serializerType, serializerRegistry);
}
if (typeInfo.IsGenericType && !typeInfo.ContainsGenericParameters)
{
Type serializerTypeDefinition;
if (_serializerTypes.TryGetValue(type.GetGenericTypeDefinition(), out serializerTypeDefinition))
{
return CreateGenericSerializer(serializerTypeDefinition, typeInfo.GetGenericArguments(), serializerRegistry);
}
}
return null;
}
/// <summary>
/// Registers the serializer mapping.
/// </summary>
/// <param name="type">The type.</param>
/// <param name="serializerType">Type of the serializer.</param>
public void RegisterMapping(Type type, Type serializerType)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
if (serializerType == null)
{
throw new ArgumentNullException("serializerType");
}
var typeInfo = type.GetTypeInfo();
var serializerTypeInfo = serializerType.GetTypeInfo();
if (typeInfo.ContainsGenericParameters != serializerTypeInfo.ContainsGenericParameters)
{
throw new ArgumentException("The type and the serializerType must have the same number of type parameters.");
}
if (typeInfo.ContainsGenericParameters)
{
if (!typeInfo.IsGenericTypeDefinition || !serializerTypeInfo.IsGenericTypeDefinition)
{
throw new ArgumentException("A generic type must either have all or none of the type parameters assigned.");
}
if (typeInfo.GetGenericArguments().Length != serializerTypeInfo.GetGenericArguments().Length)
{
throw new ArgumentException("The type and the serializerType must have the same number of type parameters.");
}
}
if (!_serializerTypes.TryAdd(type, serializerType))
{
var message = string.Format("There is already a serializer mapping registered for type {0}.", BsonUtils.GetFriendlyTypeName(type));
throw new BsonSerializationException(message);
}
}
}
}