UnitySerializationHolder.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / UnitySerializationHolder.cs / 1 / UnitySerializationHolder.cs
                        

                        
                            // ==++== 
//
//   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;

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 Type AddElementTypes(SerializationInfo info, Type type) 
        { 
            List elementTypes = new List();
            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 = 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, Type 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 = type.GetGenericTypeDefinition();
            } 

            GetUnitySerializationInfo(info, unityType, type.FullName, Assembly.GetAssembly(type)); 
        } 

        internal static void GetUnitySerializationInfo( 
            SerializationInfo info, int unityType, String data, Assembly 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"); 
 
            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(
                String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Serialization_InsufficientDeserializationState"), field));
        }
        #endregion 

        #region ISerializable 
        public virtual void GetObjectData(SerializationInfo info, StreamingContext context) 
        {
            throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnitySerHolder")); 
        }
        #endregion

        #region IObjectReference 
        [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( 
                            String.Format(CultureInfo.CurrentCulture, 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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