Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Sql / sqlser.cs / 1 / sqlser.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All Rights Reserved. // Information Contained Herein is Proprietary and Confidential. // //[....] //[....] //daltudov //[....] //beysims //[....] //vadimt //venkar //[....] //----------------------------------------------------------------------------- using System; using System.Collections; using System.Data; using System.Data.Common; using System.Data.Sql; using System.Data.SqlClient; using System.Data.SqlTypes; using System.IO; using System.Reflection; using System.Reflection.Emit; using System.Runtime.InteropServices; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary; using System.Text; namespace Microsoft.SqlServer.Server { internal class SerializationHelperSql9 { // Don't let anyone create an instance of this class. private SerializationHelperSql9() {} // Get the m_size of the serialized stream for this type, in bytes. // This method creates an instance of the type using the public // no-argument constructor, serializes it, and returns the m_size // in bytes. internal static int SizeInBytes(Type t) { return SizeInBytes(Activator.CreateInstance(t)); } // Get the m_size of the serialized stream for this type, in bytes. internal static int SizeInBytes(object instance) { Type t = instance.GetType(); Format k = GetFormat(t); DummyStream stream = new DummyStream(); Serializer ser = GetSerializer(instance.GetType()); ser.Serialize(stream, instance); return (int) stream.Length; } internal static void Serialize(Stream s, object instance) { GetSerializer(instance.GetType()).Serialize(s, instance); } internal static object Deserialize(Stream s, Type resultType) { return GetSerializer(resultType).Deserialize(s); } private static Format GetFormat(Type t) { return GetUdtAttribute(t).Format; } //cache the relationship between a type and its serializer //this is expensive to compute since it involves traversing the //custom attributes of the type using reflection. // //use a per-thread cache, so that there are no synchronization //issues when accessing cache entries from multiple threads. [ThreadStatic] private static Hashtable m_types2Serializers; private static Serializer GetSerializer(Type t) { if (m_types2Serializers == null) m_types2Serializers = new Hashtable(); Serializer s = (Serializer) m_types2Serializers[t]; if (s == null) { s = (Serializer) GetNewSerializer(t); m_types2Serializers[t] = s; } return s; } internal static int GetUdtMaxLength(Type t) { SqlUdtInfo udtInfo = SqlUdtInfo.GetFromType(t); if (Format.Native == udtInfo.SerializationFormat) { //In the native format, the user does not specify the //max byte size, it is computed from the type definition return SerializationHelperSql9.SizeInBytes(t); } else { //In all other formats, the user specifies the maximum size in bytes. return udtInfo.MaxByteSize; } } private static object[] GetCustomAttributes (Type t) { return t.GetCustomAttributes(typeof(SqlUserDefinedTypeAttribute), false); } internal static SqlUserDefinedTypeAttribute GetUdtAttribute(Type t) { SqlUserDefinedTypeAttribute udtAttr = null; object[] attr = GetCustomAttributes (t); if (attr != null && attr.Length == 1) { udtAttr = (SqlUserDefinedTypeAttribute) attr[0]; } else { throw InvalidUdtException.Create(t, Res.SqlUdtReason_NoUdtAttribute); } return udtAttr; } // Create a new serializer for the given type. private static Serializer GetNewSerializer(Type t) { SqlUserDefinedTypeAttribute udtAttr = GetUdtAttribute(t); Format k = GetFormat(t); switch (k) { case Format.Native: return new NormalizedSerializer(t); case Format.UserDefined: return new BinarySerializeSerializer(t); case Format.Unknown: // should never happen, but fall through default: throw ADP.InvalidUserDefinedTypeSerializationFormat(k); } } } // The base serializer class. internal abstract class Serializer { public abstract object Deserialize(Stream s); public abstract void Serialize(Stream s, object o); protected Type m_type; protected Serializer(Type t) { this.m_type = t; } } internal sealed class NormalizedSerializer: Serializer { BinaryOrderedUdtNormalizer m_normalizer; bool m_isFixedSize; int m_maxSize; internal NormalizedSerializer(Type t): base(t) { SqlUserDefinedTypeAttribute udtAttr = SerializationHelperSql9.GetUdtAttribute(t); this.m_normalizer = new BinaryOrderedUdtNormalizer(t, true); this.m_isFixedSize = udtAttr.IsFixedLength; this.m_maxSize = this.m_normalizer.Size; } public override void Serialize(Stream s, object o) { m_normalizer.NormalizeTopObject(o, s); } public override object Deserialize(Stream s) { object result = m_normalizer.DeNormalizeTopObject(this.m_type, s); return result; } } internal sealed class BinarySerializeSerializer: Serializer { internal BinarySerializeSerializer(Type t): base(t) { } public override void Serialize(Stream s, object o) { BinaryWriter w = new BinaryWriter(s); ((IBinarySerialize)o).Write(w); } public override object Deserialize(Stream s) { object instance = Activator.CreateInstance(m_type); BinaryReader r = new BinaryReader(s); ((IBinarySerialize)instance).Read(r); return instance; } } // A dummy stream class, used to get the number of bytes written // to the stream. internal sealed class DummyStream: Stream { private long m_size; public DummyStream() { } private void DontDoIt() { throw new Exception(Res.GetString(Res.Sql_InternalError)); } public override bool CanRead { get { return false; } } public override bool CanWrite { get { return true; } } public override bool CanSeek { get { return false; } } public override long Position { get { return this.m_size; } set { this.m_size = value; } } public override long Length { get { return this.m_size; } } public override void SetLength(long value) { this.m_size = value; } public override long Seek(long value, SeekOrigin loc) { DontDoIt(); return -1; } public override void Flush() { } public override int Read(byte[] buffer, int offset, int count) { DontDoIt(); return -1; } public override void Write(byte[] buffer, int offset, int count) { this.m_size += count; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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