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using System;
using System.Reflection;
using ProtoBuf.Meta;
namespace ProtoBuf.Serializers
{
internal sealed class SurrogateSerializer : IProtoTypeSerializer, IProtoSerializer
{
public bool ReturnsValue
{
get
{
return false;
}
}
public bool RequiresOldValue
{
get
{
return true;
}
}
public Type ExpectedType
{
get
{
return this.forType;
}
}
private readonly Type forType;
private readonly Type declaredType;
private readonly MethodInfo toTail;
private readonly MethodInfo fromTail;
private IProtoTypeSerializer rootTail;
bool IProtoTypeSerializer.HasCallbacks(TypeModel.CallbackType callbackType)
{
return false;
}
bool IProtoTypeSerializer.CanCreateInstance()
{
return false;
}
object IProtoTypeSerializer.CreateInstance(ProtoReader source)
{
throw new NotSupportedException();
}
void IProtoTypeSerializer.Callback(object value, TypeModel.CallbackType callbackType, SerializationContext context)
{
}
public SurrogateSerializer(TypeModel model, Type forType, Type declaredType, IProtoTypeSerializer rootTail)
{
Helpers.DebugAssert(forType != null, "forType");
Helpers.DebugAssert(declaredType != null, "declaredType");
Helpers.DebugAssert(rootTail != null, "rootTail");
Helpers.DebugAssert(rootTail.RequiresOldValue, "RequiresOldValue");
Helpers.DebugAssert(!rootTail.ReturnsValue, "ReturnsValue");
Helpers.DebugAssert(declaredType == rootTail.ExpectedType || Helpers.IsSubclassOf(declaredType, rootTail.ExpectedType));
this.forType = forType;
this.declaredType = declaredType;
this.rootTail = rootTail;
this.toTail = this.GetConversion(model, true);
this.fromTail = this.GetConversion(model, false);
}
private static bool HasCast(TypeModel model, Type type, Type from, Type to, out MethodInfo op)
{
MethodInfo[] methods = type.GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
Type type2 = null;
foreach (MethodInfo methodInfo in methods)
{
bool flag = methodInfo.ReturnType != to;
if (!flag)
{
ParameterInfo[] parameters = methodInfo.GetParameters();
bool flag2 = parameters.Length == 1 && parameters[0].ParameterType == from;
if (flag2)
{
bool flag3 = type2 == null;
if (flag3)
{
type2 = model.MapType(typeof(ProtoConverterAttribute), false);
bool flag4 = type2 == null;
if (flag4)
{
break;
}
}
bool flag5 = methodInfo.IsDefined(type2, true);
if (flag5)
{
op = methodInfo;
return true;
}
}
}
}
foreach (MethodInfo methodInfo2 in methods)
{
bool flag6 = (methodInfo2.Name != "op_Implicit" && methodInfo2.Name != "op_Explicit") || methodInfo2.ReturnType != to;
if (!flag6)
{
ParameterInfo[] parameters = methodInfo2.GetParameters();
bool flag7 = parameters.Length == 1 && parameters[0].ParameterType == from;
if (flag7)
{
op = methodInfo2;
return true;
}
}
}
op = null;
return false;
}
public MethodInfo GetConversion(TypeModel model, bool toTail)
{
Type to = toTail ? this.declaredType : this.forType;
Type from = toTail ? this.forType : this.declaredType;
MethodInfo result;
bool flag = SurrogateSerializer.HasCast(model, this.declaredType, from, to, out result) || SurrogateSerializer.HasCast(model, this.forType, from, to, out result);
if (flag)
{
return result;
}
throw new InvalidOperationException("No suitable conversion operator found for surrogate: " + this.forType.FullName + " / " + this.declaredType.FullName);
}
public void Write(object value, ProtoWriter writer)
{
ProtoDecoratorBase.s_argsWrite[0] = value;
this.rootTail.Write(this.toTail.Invoke(null, ProtoDecoratorBase.s_argsWrite), writer);
}
public object Read(object value, ProtoReader source)
{
ProtoDecoratorBase.s_argsRead[0] = value;
value = this.toTail.Invoke(null, ProtoDecoratorBase.s_argsRead);
ProtoDecoratorBase.s_argsRead[0] = this.rootTail.Read(value, source);
return this.fromTail.Invoke(null, ProtoDecoratorBase.s_argsRead);
}
}
}
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