/
ClassProxyInstanceContributor.cs
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/
ClassProxyInstanceContributor.cs
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// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
//
// 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.
namespace Castle.DynamicProxy.Contributors
{
using System;
using System.Collections.Generic;
using System.Reflection;
#if FEATURE_SERIALIZATION
using System.Runtime.Serialization;
#endif
using Castle.DynamicProxy.Generators.Emitters;
using Castle.DynamicProxy.Generators.Emitters.CodeBuilders;
using Castle.DynamicProxy.Generators.Emitters.SimpleAST;
using Castle.DynamicProxy.Internal;
using Castle.DynamicProxy.Tokens;
internal class ClassProxyInstanceContributor : ProxyInstanceContributor
{
#if FEATURE_SERIALIZATION
private readonly bool delegateToBaseGetObjectData;
private readonly bool implementISerializable;
private ConstructorInfo serializationConstructor;
private readonly IList<FieldReference> serializedFields = new List<FieldReference>();
#endif
public ClassProxyInstanceContributor(Type targetType, IList<MethodInfo> methodsToSkip, Type[] interfaces,
string typeId)
: base(targetType, interfaces, typeId)
{
#if FEATURE_SERIALIZATION
if (targetType.IsSerializable)
{
implementISerializable = true;
delegateToBaseGetObjectData = VerifyIfBaseImplementsGetObjectData(targetType, methodsToSkip);
}
#endif
}
protected override Reference GetTargetReference(ClassEmitter emitter)
{
return SelfReference.Self;
}
public override void Generate(ClassEmitter @class)
{
var interceptors = @class.GetField("__interceptors");
#if FEATURE_SERIALIZATION
if (implementISerializable)
{
ImplementGetObjectData(@class);
Constructor(@class);
}
#endif
ImplementProxyTargetAccessor(@class, interceptors);
foreach (var attribute in targetType.GetNonInheritableAttributes())
{
@class.DefineCustomAttribute(attribute.Builder);
}
}
#if FEATURE_SERIALIZATION
protected override void AddAddValueInvocation(ArgumentReference serializationInfo, MethodEmitter getObjectData,
FieldReference field)
{
serializedFields.Add(field);
base.AddAddValueInvocation(serializationInfo, getObjectData, field);
}
protected override void CustomizeGetObjectData(AbstractCodeBuilder codebuilder, ArgumentReference serializationInfo,
ArgumentReference streamingContext, ClassEmitter emitter)
{
codebuilder.AddStatement(new ExpressionStatement(
new MethodInvocationExpression(
serializationInfo,
SerializationInfoMethods.AddValue_Bool,
new ConstReference("__delegateToBase").ToExpression(),
new ConstReference(delegateToBaseGetObjectData).
ToExpression())));
if (delegateToBaseGetObjectData == false)
{
EmitCustomGetObjectData(codebuilder, serializationInfo);
return;
}
EmitCallToBaseGetObjectData(codebuilder, serializationInfo, streamingContext);
}
private void EmitCustomGetObjectData(AbstractCodeBuilder codebuilder, ArgumentReference serializationInfo)
{
var members = codebuilder.DeclareLocal(typeof(MemberInfo[]));
var data = codebuilder.DeclareLocal(typeof(object[]));
var getSerializableMembers = new MethodInvocationExpression(
null,
FormatterServicesMethods.GetSerializableMembers,
new TypeTokenExpression(targetType));
codebuilder.AddStatement(new AssignStatement(members, getSerializableMembers));
// Sort to keep order on both serialize and deserialize side the same, c.f DYNPROXY-ISSUE-127
var callSort = new MethodInvocationExpression(
null,
TypeUtilMethods.Sort,
members.ToExpression());
codebuilder.AddStatement(new AssignStatement(members, callSort));
var getObjectData = new MethodInvocationExpression(
null,
FormatterServicesMethods.GetObjectData,
SelfReference.Self.ToExpression(),
members.ToExpression());
codebuilder.AddStatement(new AssignStatement(data, getObjectData));
var addValue = new MethodInvocationExpression(
serializationInfo,
SerializationInfoMethods.AddValue_Object,
new ConstReference("__data").ToExpression(),
data.ToExpression());
codebuilder.AddStatement(new ExpressionStatement(addValue));
}
private void EmitCallToBaseGetObjectData(AbstractCodeBuilder codebuilder, ArgumentReference serializationInfo,
ArgumentReference streamingContext)
{
var baseGetObjectData = targetType.GetMethod("GetObjectData",
new[] { typeof(SerializationInfo), typeof(StreamingContext) });
codebuilder.AddStatement(new ExpressionStatement(
new MethodInvocationExpression(baseGetObjectData,
serializationInfo.ToExpression(),
streamingContext.ToExpression())));
}
private void Constructor(ClassEmitter emitter)
{
if (!delegateToBaseGetObjectData)
{
return;
}
GenerateSerializationConstructor(emitter);
}
private void GenerateSerializationConstructor(ClassEmitter emitter)
{
var serializationInfo = new ArgumentReference(typeof(SerializationInfo));
var streamingContext = new ArgumentReference(typeof(StreamingContext));
var ctor = emitter.CreateConstructor(serializationInfo, streamingContext);
ctor.CodeBuilder.AddStatement(
new ConstructorInvocationStatement(serializationConstructor,
serializationInfo.ToExpression(),
streamingContext.ToExpression()));
foreach (var field in serializedFields)
{
var getValue = new MethodInvocationExpression(serializationInfo,
SerializationInfoMethods.GetValue,
new ConstReference(field.Reference.Name).ToExpression(),
new TypeTokenExpression(field.Reference.FieldType));
ctor.CodeBuilder.AddStatement(new AssignStatement(
field,
new ConvertExpression(field.Reference.FieldType,
typeof(object),
getValue)));
}
ctor.CodeBuilder.AddStatement(new ReturnStatement());
}
private bool VerifyIfBaseImplementsGetObjectData(Type baseType, IList<MethodInfo> methodsToSkip)
{
if (!typeof(ISerializable).IsAssignableFrom(baseType))
{
return false;
}
if (baseType.IsDelegateType())
{
//working around bug in CLR which returns true for "does this type implement ISerializable" for delegates
return false;
}
// If base type implements ISerializable, we have to make sure
// the GetObjectData is marked as virtual
var getObjectDataMethod = baseType.GetInterfaceMap(typeof(ISerializable)).TargetMethods[0];
if (getObjectDataMethod.IsPrivate) //explicit interface implementation
{
return false;
}
if (!getObjectDataMethod.IsVirtual || getObjectDataMethod.IsFinal)
{
var message = String.Format("The type {0} implements ISerializable, but GetObjectData is not marked as virtual. " +
"Dynamic Proxy needs types implementing ISerializable to mark GetObjectData as virtual " +
"to ensure correct serialization process.",
baseType.FullName);
throw new ArgumentException(message);
}
methodsToSkip.Add(getObjectDataMethod);
serializationConstructor = baseType.GetConstructor(
BindingFlags.Instance | BindingFlags.Public |
BindingFlags.NonPublic,
null,
new[] { typeof(SerializationInfo), typeof(StreamingContext) },
null);
if (serializationConstructor == null)
{
var message = String.Format("The type {0} implements ISerializable, " +
"but failed to provide a deserialization constructor",
baseType.FullName);
throw new ArgumentException(message);
}
return true;
}
#endif
}
}