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BsonSerializerAttribute.cs
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BsonSerializerAttribute.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.Reflection;
namespace MongoDB.Bson.Serialization.Attributes
{
/// <summary>
/// Specifies the type of the serializer to use for a class.
/// </summary>
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Interface | AttributeTargets.Property | AttributeTargets.Field)]
public class BsonSerializerAttribute : Attribute, IBsonMemberMapAttribute
{
// private fields
private Type _serializerType;
// constructors
/// <summary>
/// Initializes a new instance of the BsonSerializerAttribute class.
/// </summary>
public BsonSerializerAttribute()
{
}
/// <summary>
/// Initializes a new instance of the BsonSerializerAttribute class.
/// </summary>
/// <param name="serializerType">The type of the serializer to use for a class.</param>
public BsonSerializerAttribute(Type serializerType)
{
_serializerType = serializerType;
}
// public properties
/// <summary>
/// Gets or sets the type of the serializer to use for a class.
/// </summary>
public Type SerializerType
{
get { return _serializerType; }
set { _serializerType = value; }
}
// public methods
/// <summary>
/// Applies a modification to the member map.
/// </summary>
/// <param name="memberMap">The member map.</param>
public void Apply(BsonMemberMap memberMap)
{
var serializer = CreateSerializer(memberMap.MemberType);
memberMap.SetSerializer(serializer);
}
/// <summary>
/// Creates a serializer for a type based on the serializer type specified by the attribute.
/// </summary>
/// <param name="type">The type that a serializer should be created for.</param>
/// <returns>A serializer for the type.</returns>
internal IBsonSerializer CreateSerializer(Type type)
{
var typeInfo = type.GetTypeInfo();
if (typeInfo.ContainsGenericParameters)
{
var message = "Cannot create a serializer because the type to serialize is an open generic type.";
throw new InvalidOperationException(message);
}
var serializerTypeInfo = _serializerType.GetTypeInfo();
if (serializerTypeInfo.ContainsGenericParameters && !typeInfo.IsGenericType)
{
var message = "Cannot create a serializer because the serializer type is an open generic type and the type to serialize is not generic.";
throw new InvalidOperationException(message);
}
if (serializerTypeInfo.ContainsGenericParameters)
{
var genericArguments = typeInfo.GetGenericArguments();
var closedSerializerType = _serializerType.MakeGenericType(genericArguments);
return (IBsonSerializer)Activator.CreateInstance(closedSerializerType);
}
else
{
return (IBsonSerializer)Activator.CreateInstance(_serializerType);
}
}
}
}