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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
using System.Runtime.Remoting;
using System.Runtime.Serialization;
using System.Reflection;
using System.Globalization;
using System.Runtime.Versioning;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
namespace System {
[Serializable]
// Holds classes (Empty, Null, Missing) for which we guarantee that there is only ever one instance of.
internal class UnitySerializationHolder : ISerializable, IObjectReference
{
#region Internal Constants
internal const int EmptyUnity = 0x0001;
internal const int NullUnity = 0x0002;
internal const int MissingUnity = 0x0003;
internal const int RuntimeTypeUnity = 0x0004;
internal const int ModuleUnity = 0x0005;
internal const int AssemblyUnity = 0x0006;
internal const int GenericParameterTypeUnity = 0x0007;
internal const int PartialInstantiationTypeUnity = 0x0008;
internal const int Pointer = 0x0001;
internal const int Array = 0x0002;
internal const int SzArray = 0x0003;
internal const int ByRef = 0x0004;
#endregion
#region Internal Static Members
internal static void GetUnitySerializationInfo(SerializationInfo info, Missing missing)
{
info.SetType(typeof(UnitySerializationHolder));
info.AddValue("UnityType", MissingUnity);
}
internal static RuntimeType AddElementTypes(SerializationInfo info, RuntimeType type)
{
List<int> elementTypes = new List<int>();
while(type.HasElementType)
{
if (type.IsSzArray)
{
elementTypes.Add(SzArray);
}
else if (type.IsArray)
{
elementTypes.Add(type.GetArrayRank());
elementTypes.Add(Array);
}
else if (type.IsPointer)
{
elementTypes.Add(Pointer);
}
else if (type.IsByRef)
{
elementTypes.Add(ByRef);
}
type = (RuntimeType)type.GetElementType();
}
info.AddValue("ElementTypes", elementTypes.ToArray(), typeof(int[]));
return type;
}
internal Type MakeElementTypes(Type type)
{
for (int i = m_elementTypes.Length - 1; i >= 0; i --)
{
if (m_elementTypes[i] == SzArray)
{
type = type.MakeArrayType();
}
else if (m_elementTypes[i] == Array)
{
type = type.MakeArrayType(m_elementTypes[--i]);
}
else if ((m_elementTypes[i] == Pointer))
{
type = type.MakePointerType();
}
else if ((m_elementTypes[i] == ByRef))
{
type = type.MakeByRefType();
}
}
return type;
}
internal static void GetUnitySerializationInfo(SerializationInfo info, RuntimeType type)
{
if (type.GetRootElementType().IsGenericParameter)
{
type = AddElementTypes(info, type);
info.SetType(typeof(UnitySerializationHolder));
info.AddValue("UnityType", GenericParameterTypeUnity);
info.AddValue("GenericParameterPosition", type.GenericParameterPosition);
info.AddValue("DeclaringMethod", type.DeclaringMethod, typeof(MethodBase));
info.AddValue("DeclaringType", type.DeclaringType, typeof(Type));
return;
}
int unityType = RuntimeTypeUnity;
if (!type.IsGenericTypeDefinition && type.ContainsGenericParameters)
{
// Partial instantiation
unityType = PartialInstantiationTypeUnity;
type = AddElementTypes(info, type);
info.AddValue("GenericArguments", type.GetGenericArguments(), typeof(Type[]));
type = (RuntimeType)type.GetGenericTypeDefinition();
}
GetUnitySerializationInfo(info, unityType, type.FullName, type.GetRuntimeAssembly());
}
internal static void GetUnitySerializationInfo(
SerializationInfo info, int unityType, String data, RuntimeAssembly assembly)
{
// A helper method that returns the SerializationInfo that a class utilizing
// UnitySerializationHelper should return from a call to GetObjectData. It contains
// the unityType (defined above) and any optional data (used only for the reflection
// types.)
info.SetType(typeof(UnitySerializationHolder));
info.AddValue("Data", data, typeof(String));
info.AddValue("UnityType", unityType);
String assemName;
if (assembly == null)
{
assemName = String.Empty;
}
else
{
assemName = assembly.FullName;
}
info.AddValue("AssemblyName", assemName);
}
#endregion
#region Private Data Members
private Type[] m_instantiation;
private int[] m_elementTypes;
private int m_genericParameterPosition;
private Type m_declaringType;
private MethodBase m_declaringMethod;
private String m_data;
private String m_assemblyName;
private int m_unityType;
#endregion
#region Constructor
internal UnitySerializationHolder(SerializationInfo info, StreamingContext context)
{
if (info == null)
throw new ArgumentNullException("info");
Contract.EndContractBlock();
m_unityType = info.GetInt32("UnityType");
if (m_unityType == MissingUnity)
return;
if (m_unityType == GenericParameterTypeUnity)
{
m_declaringMethod = info.GetValue("DeclaringMethod", typeof(MethodBase)) as MethodBase;
m_declaringType = info.GetValue("DeclaringType", typeof(Type)) as Type;
m_genericParameterPosition = info.GetInt32("GenericParameterPosition");
m_elementTypes = info.GetValue("ElementTypes", typeof(int[])) as int[];
return;
}
if (m_unityType == PartialInstantiationTypeUnity)
{
m_instantiation = info.GetValue("GenericArguments", typeof(Type[])) as Type[];
m_elementTypes = info.GetValue("ElementTypes", typeof(int[])) as int[];
}
m_data = info.GetString("Data");
m_assemblyName = info.GetString("AssemblyName");
}
#endregion
#region Private Methods
private void ThrowInsufficientInformation(string field)
{
throw new SerializationException(
Environment.GetResourceString("Serialization_InsufficientDeserializationState", field));
}
#endregion
#region ISerializable
[System.Security.SecurityCritical] // auto-generated
public virtual void GetObjectData(SerializationInfo info, StreamingContext context)
{
throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnitySerHolder"));
}
#endregion
#region IObjectReference
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.None)] // The Module here was already created and theoretically scoped. There's not enough information to pass this info through to the serializer, and most serialization instances aren't using machine resources.
[ResourceConsumption(ResourceScope.Machine | ResourceScope.Assembly, ResourceScope.Machine | ResourceScope.Assembly)]
public virtual Object GetRealObject(StreamingContext context)
{
// GetRealObject uses the data we have in m_data and m_unityType to do a lookup on the correct
// object to return. We have specific code here to handle the different types which we support.
// The reflection types (Assembly, Module, and Type) have to be looked up through their static
// accessors by name.
Assembly assembly;
switch (m_unityType)
{
case EmptyUnity:
{
return Empty.Value;
}
case NullUnity:
{
return DBNull.Value;
}
case MissingUnity:
{
return Missing.Value;
}
case PartialInstantiationTypeUnity:
{
m_unityType = RuntimeTypeUnity;
Type definition = GetRealObject(context) as Type;
m_unityType = PartialInstantiationTypeUnity;
if (m_instantiation[0] == null)
return null;
return MakeElementTypes(definition.MakeGenericType(m_instantiation));
}
case GenericParameterTypeUnity:
{
if (m_declaringMethod == null && m_declaringType == null)
ThrowInsufficientInformation("DeclaringMember");
if (m_declaringMethod != null)
return m_declaringMethod.GetGenericArguments()[m_genericParameterPosition];
return MakeElementTypes(m_declaringType.GetGenericArguments()[m_genericParameterPosition]);
}
case RuntimeTypeUnity:
{
if (m_data == null || m_data.Length == 0)
ThrowInsufficientInformation("Data");
if (m_assemblyName == null)
ThrowInsufficientInformation("AssemblyName");
if (m_assemblyName.Length == 0)
return Type.GetType(m_data, true, false);
assembly = Assembly.Load(m_assemblyName);
Type t = assembly.GetType(m_data, true, false);
return t;
}
case ModuleUnity:
{
if (m_data == null || m_data.Length == 0)
ThrowInsufficientInformation("Data");
if (m_assemblyName == null)
ThrowInsufficientInformation("AssemblyName");
assembly = Assembly.Load(m_assemblyName);
Module namedModule = assembly.GetModule(m_data);
if (namedModule == null)
throw new SerializationException(
Environment.GetResourceString("Serialization_UnableToFindModule", m_data, m_assemblyName));
return namedModule;
}
case AssemblyUnity:
{
if (m_data == null || m_data.Length == 0)
ThrowInsufficientInformation("Data");
if (m_assemblyName == null)
ThrowInsufficientInformation("AssemblyName");
assembly = Assembly.Load(m_assemblyName);
return assembly;
}
default:
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidUnity"));
}
}
#endregion
}
}
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