SqlUDTStorage.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Common / SQLTypes / SqlUDTStorage.cs / 1305376 / SqlUDTStorage.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

namespace System.Data.Common { 
    using System;
    using System.Data;
    using System.Data.SqlClient;
    using System.Data.SqlTypes; 
    using System.Xml;
    using System.IO; 
    using System.Xml.Serialization; 
    using System.Globalization;
    using System.Collections; 
    using System.Collections.Generic;
    using System.Diagnostics;

    internal sealed class SqlUdtStorage : DataStorage { 

        private object[] values; 
        private readonly bool  implementsIXmlSerializable = false; 
        private readonly bool  implementsIComparable = false;
 
        private static readonly Dictionary TypeToNull = new Dictionary();

        public SqlUdtStorage(DataColumn column, Type type)
        : this(column, type, GetStaticNullForUdtType(type)) { 
        }
 
        private SqlUdtStorage(DataColumn column, Type type, object nullValue) 
        : base(column, type, nullValue, nullValue, typeof(ICloneable).IsAssignableFrom(type)) {
            implementsIXmlSerializable =  typeof(IXmlSerializable).IsAssignableFrom(type); 
            implementsIComparable = typeof(IComparable).IsAssignableFrom(type);
        }

      // Webdata 104340, to support oracle types and other INUllable types that have static Null as field 
        internal static object GetStaticNullForUdtType(Type type) {
            object value; 
            if (!TypeToNull.TryGetValue(type, out value)) { 
                System.Reflection.PropertyInfo propInfo = type.GetProperty("Null", System.Reflection.BindingFlags.Public |System.Reflection.BindingFlags.Static);
                if (propInfo  != null) 
                    value = propInfo.GetValue(null, null);
                else {
                    System.Reflection.FieldInfo fieldInfo = type.GetField("Null", System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
                    if (fieldInfo != null) { 
                        value =  fieldInfo.GetValue(null);
                    } 
                    else { 
                        throw ExceptionBuilder.INullableUDTwithoutStaticNull(type.AssemblyQualifiedName);
                    } 
                }
                lock(TypeToNull) {
                    //if(50 < TypeToNull.Count) {
                    //    TypeToNull.Clear(); 
                    //}
                    TypeToNull[type] = value; 
                } 
            }
            return value; 
        }

        override public bool IsNull(int record) {
            return (((INullable)values[record]).IsNull); 
        }
 
        override public Object Aggregate(int[] records, AggregateType kind) { 
            throw ExceptionBuilder.AggregateException(kind, DataType);
        } 

        override public int Compare(int recordNo1, int recordNo2) {
            return (CompareValueTo(recordNo1, values[recordNo2]));
        } 

        override public int CompareValueTo(int recordNo1, Object value) { 
            if (DBNull.Value == value) { // it is not meaningful compare UDT with DBNull.Value   WebData 113372 
                value = NullValue;
            } 
            if(implementsIComparable) {
                IComparable comparable = (IComparable)values[recordNo1];
                return comparable.CompareTo(value);
            } 
            else if (NullValue == value) {
                INullable nullableValue = (INullable)values[recordNo1]; 
                return nullableValue.IsNull ? 0 : 1; // left may be null, right is null 
            }
            // else 
            throw ExceptionBuilder.IComparableNotImplemented(DataType.AssemblyQualifiedName);
        }

        override public void Copy(int recordNo1, int recordNo2) { 
            CopyBits(recordNo1, recordNo2);
            values[recordNo2] = values[recordNo1]; 
        } 

        override public Object Get(int recordNo) { 
            return (values[recordNo]);
        }

        override public void Set(int recordNo, Object value) { 
            if (DBNull.Value == value) {
                values[recordNo] = NullValue; 
                SetNullBit(recordNo, true); 
            }
            else if (null == value) { 
                if (IsValueType) {
                    throw ExceptionBuilder.StorageSetFailed();
                }
                else { 
                    values[recordNo] = NullValue;
                    SetNullBit(recordNo, true); 
                } 
            }
            else if (!DataType.IsInstanceOfType(value)) { 
                throw ExceptionBuilder.StorageSetFailed();
            }
            else { // WebData  113331 do not clone the value
                values[recordNo] = value; 
                SetNullBit(recordNo, false);
            } 
        } 

        override public void SetCapacity(int capacity) { 
            object[] newValues = new object[capacity];
            if (values != null) {
                Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
            } 
            values = newValues;
            base.SetCapacity(capacity); 
        } 

        override public object ConvertXmlToObject(string s) { 
            if (implementsIXmlSerializable) {
                object Obj = System.Activator.CreateInstance (DataType, true);

                string tempStr =string.Concat("", s, ""); // this is done since you can give fragmet to reader, bug 98767 
                StringReader strReader = new  StringReader(tempStr);
 
                using (XmlTextReader xmlTextReader = new XmlTextReader(strReader)) { 
                    ((IXmlSerializable)Obj).ReadXml(xmlTextReader);
                } 
                return Obj;
            }

            StringReader strreader = new  StringReader(s); 
            XmlSerializer deserializerWithOutRootAttribute = ObjectStorage.GetXmlSerializer(DataType);
            return(deserializerWithOutRootAttribute.Deserialize(strreader)); 
        } 

        public override object ConvertXmlToObject(XmlReader xmlReader, XmlRootAttribute xmlAttrib) { 
            if (null == xmlAttrib) {
                string typeName = xmlReader.GetAttribute(Keywords.MSD_INSTANCETYPE, Keywords.MSDNS);
                if (typeName == null) {
                    string xsdTypeName = xmlReader.GetAttribute(Keywords.MSD_INSTANCETYPE, Keywords.XSINS); // this xsd type 
                    if (null != xsdTypeName) {
                        typeName = XSDSchema.XsdtoClr(xsdTypeName).FullName; 
                    } 
                }
                Type type = (typeName == null)? DataType : Type.GetType(typeName); 
                object Obj = System.Activator.CreateInstance (type, true);
                Debug.Assert(xmlReader is DataTextReader, "Invalid DataTextReader is being passed to customer");
                ((IXmlSerializable)Obj).ReadXml(xmlReader);
                return Obj; 
            }
            else{ 
                XmlSerializer deserializerWithRootAttribute = ObjectStorage.GetXmlSerializer(DataType, xmlAttrib); 
                return(deserializerWithRootAttribute.Deserialize(xmlReader));
            } 
        }


        override public string ConvertObjectToXml(object value) { 
            StringWriter strwriter = new StringWriter(FormatProvider);
            if (implementsIXmlSerializable) { 
                using (XmlTextWriter xmlTextWriter = new XmlTextWriter (strwriter)) { 
                    ((IXmlSerializable)value).WriteXml(xmlTextWriter);
                } 
             }
            else {
                XmlSerializer serializerWithOutRootAttribute = ObjectStorage.GetXmlSerializer(value.GetType());
                serializerWithOutRootAttribute.Serialize(strwriter, value); 
            }
            return (strwriter.ToString ()); 
        } 

        public override void ConvertObjectToXml(object value, XmlWriter xmlWriter, XmlRootAttribute xmlAttrib) { 
            if (null == xmlAttrib) {
                Debug.Assert(xmlWriter is DataTextWriter, "Invalid DataTextWriter is being passed to customer");
                ((IXmlSerializable)value).WriteXml(xmlWriter);
            } 
            else {
                // we support polymorphism only for types that implements IXmlSerializable. 
                // Assumption: value is the same type as DataType 

                XmlSerializer serializerWithRootAttribute = ObjectStorage.GetXmlSerializer(DataType, xmlAttrib); 
                serializerWithRootAttribute.Serialize(xmlWriter, value);
            }
        }
 
        override protected object GetEmptyStorage(int recordCount) {
            return new Object[recordCount]; 
        } 

        override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { 
            Object[] typedStore = (Object[]) store;
            typedStore[storeIndex] = values[record];
            nullbits.Set(storeIndex, IsNull(record));
        } 

        override protected void SetStorage(object store, BitArray nullbits) { 
            values = (Object[]) store; 
            //SetNullStorage(nullbits);
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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SqlUDTStorage.cs source code in C# .NET

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