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) { ListelementTypes = 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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