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ReadWriteMemberFinderConvention.cs
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ReadWriteMemberFinderConvention.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.Reflection;
namespace MongoDB.Bson.Serialization.Conventions
{
/// <summary>
/// A convention that finds readable and writeable members and adds them to the class map.
/// </summary>
public class ReadWriteMemberFinderConvention : ConventionBase, IClassMapConvention
{
// private fields
private readonly BindingFlags _bindingFlags;
private readonly MemberTypes _memberTypes;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="ReadWriteMemberFinderConvention" /> class.
/// </summary>
public ReadWriteMemberFinderConvention()
: this(BindingFlags.Instance | BindingFlags.Public)
{ }
/// <summary>
/// Initializes a new instance of the <see cref="ReadWriteMemberFinderConvention" /> class.
/// </summary>
/// <param name="memberTypes">The member types.</param>
public ReadWriteMemberFinderConvention(MemberTypes memberTypes)
: this(memberTypes, BindingFlags.Instance | BindingFlags.Public)
{ }
/// <summary>
/// Initializes a new instance of the <see cref="ReadWriteMemberFinderConvention" /> class.
/// </summary>
/// <param name="bindingFlags">The binding flags.</param>
public ReadWriteMemberFinderConvention(BindingFlags bindingFlags)
: this(MemberTypes.Field | MemberTypes.Property, bindingFlags)
{ }
/// <summary>
/// Initializes a new instance of the <see cref="ReadWriteMemberFinderConvention" /> class.
/// </summary>
/// <param name="memberTypes">The member types.</param>
/// <param name="bindingFlags">The binding flags.</param>
public ReadWriteMemberFinderConvention(MemberTypes memberTypes, BindingFlags bindingFlags)
{
_memberTypes = memberTypes;
_bindingFlags = bindingFlags | BindingFlags.DeclaredOnly;
}
// public methods
/// <summary>
/// Applies a modification to the class map.
/// </summary>
/// <param name="classMap">The class map.</param>
public void Apply(BsonClassMap classMap)
{
// order is important for backwards compatibility and GetMembers changes the order of finding things.
// hence, we'll check member types explicitly instead of letting GetMembers handle it.
if ((_memberTypes & MemberTypes.Field) == MemberTypes.Field)
{
var fields = classMap.ClassType.GetTypeInfo().GetFields(_bindingFlags);
foreach (var field in fields)
{
MapField(classMap, field);
}
}
if ((_memberTypes & MemberTypes.Property) == MemberTypes.Property)
{
var properties = classMap.ClassType.GetTypeInfo().GetProperties(_bindingFlags);
foreach (var property in properties)
{
MapProperty(classMap, property);
}
}
}
// private methods
private void MapField(BsonClassMap classMap, FieldInfo fieldInfo)
{
if (fieldInfo.IsInitOnly || fieldInfo.IsLiteral)
{
// we can't write
return;
}
classMap.MapMember(fieldInfo);
}
private void MapProperty(BsonClassMap classMap, PropertyInfo propertyInfo)
{
if (!propertyInfo.CanRead || !propertyInfo.CanWrite)
{
// only read and write properties are mapped
return;
}
// skip indexers
if (propertyInfo.GetIndexParameters().Length != 0)
{
return;
}
// skip overridden properties (they are already included by the base class)
var getMethodInfo = propertyInfo.GetMethod;
if (getMethodInfo.IsVirtual && getMethodInfo.GetBaseDefinition().DeclaringType != classMap.ClassType)
{
return;
}
classMap.MapMember(propertyInfo);
}
}
}