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ImmutableTypeClassMapConvention.cs
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ImmutableTypeClassMapConvention.cs
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/* Copyright 2016-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.Linq;
using System.Reflection;
namespace MongoDB.Bson.Serialization.Conventions
{
/// <summary>
/// Maps a fully immutable type. This will include anonymous types.
/// </summary>
public class ImmutableTypeClassMapConvention : ConventionBase, IClassMapConvention
{
/// <inheritdoc />
public void Apply(BsonClassMap classMap)
{
var typeInfo = classMap.ClassType.GetTypeInfo();
if (typeInfo.GetConstructor(Type.EmptyTypes) != null)
{
return;
}
var propertyBindingFlags = BindingFlags.Public | BindingFlags.Instance;
var properties = typeInfo.GetProperties(propertyBindingFlags);
if (properties.Any(CanWrite))
{
return; // a type that has any writable properties is not immutable
}
var anyConstructorsWereFound = false;
var constructors = GetUsableConstructors(typeInfo);
foreach (var ctor in constructors)
{
if (ctor.IsPrivate)
{
continue; // do not consider private constructors
}
var parameters = ctor.GetParameters();
var matches = parameters
.GroupJoin(properties,
parameter => parameter.Name,
property => property.Name,
(parameter, props) => new { Parameter = parameter, Properties = props },
StringComparer.OrdinalIgnoreCase);
if (matches.Any(m => m.Properties.Count() != 1))
{
continue;
}
if (ctor.IsPublic && !typeInfo.IsAbstract)
{
// we need to save constructorInfo only for public constructors in non abstract classes
classMap.MapConstructor(ctor);
}
anyConstructorsWereFound = true;
}
if (anyConstructorsWereFound)
{
// if any constructors were found by this convention
// then map all the properties from the ClassType inheritance level also
foreach (var property in properties)
{
if (property.DeclaringType != classMap.ClassType)
{
continue;
}
if (!PropertyMatchesSomeCreatorParameter(classMap, property))
{
continue;
}
var memberMap = classMap.MapMember(property);
if (classMap.IsAnonymous)
{
var defaultValue = memberMap.DefaultValue;
memberMap.SetDefaultValue(defaultValue);
}
}
}
}
// private methods
private bool CanWrite(PropertyInfo propertyInfo)
{
// CanWrite gets true even if a property has only a private setter
return propertyInfo.CanWrite && (propertyInfo.SetMethod?.IsPublic ?? false);
}
private ConstructorInfo[] GetUsableConstructors(TypeInfo typeInfo)
{
var constructorBindingFlags = BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance;
return typeInfo.GetConstructors(constructorBindingFlags);
}
private bool PropertyMatchesSomeCreatorParameter(BsonClassMap classMap, PropertyInfo propertyInfo)
{
foreach (var creatorMap in classMap.CreatorMaps)
{
if (creatorMap.MemberInfo is ConstructorInfo constructorInfo)
{
if (PropertyMatchesSomeConstructorParameter(constructorInfo))
{
return true;
}
}
}
// also map properties that match some constructor parameter that might be called by a derived class
var classTypeInfo = classMap.ClassType.GetTypeInfo();
var constructors = GetUsableConstructors(classTypeInfo);
foreach (var constructorInfo in constructors)
{
if (classTypeInfo.IsAbstract ||
constructorInfo.IsFamily || // protected
constructorInfo.IsFamilyOrAssembly) // protected internal
{
if (PropertyMatchesSomeConstructorParameter(constructorInfo))
{
return true;
}
}
}
return false;
bool PropertyMatchesSomeConstructorParameter(ConstructorInfo constructorInfo)
{
foreach (var parameter in constructorInfo.GetParameters())
{
if (string.Equals(propertyInfo.Name, parameter.Name, StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
return false;
}
}
}
}