ObjectStorage.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / ObjectStorage.cs / 2 / ObjectStorage.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

namespace System.Data.Common { 
    using System;
    using System.Data;
    using System.Xml;
    using System.IO; 
    using System.Xml.Serialization;
    using System.Collections; 
    using System.Collections.Generic; 
    using System.Diagnostics;
 
    internal sealed class ObjectStorage : DataStorage {

        static private readonly Object defaultValue = null;
 
        private enum Families { DATETIME, NUMBER, STRING, BOOLEAN, ARRAY };
 
        private object[] values; 
        private readonly bool implementsIXmlSerializable;
 
        internal ObjectStorage(DataColumn column, Type type)
        : base(column, type, defaultValue, DBNull.Value, typeof(ICloneable).IsAssignableFrom(type)) {
            implementsIXmlSerializable =  typeof(IXmlSerializable).IsAssignableFrom(type);
        } 

        override public Object Aggregate(int[] records, AggregateType kind) { 
            throw ExceptionBuilder.AggregateException(kind, DataType); 
        }
 
        override public int Compare(int recordNo1, int recordNo2) {
            object valueNo1 = values[recordNo1];
            object valueNo2 = values[recordNo2];
 
            if (valueNo1 == valueNo2)
                return 0; 
            if (valueNo1 == null) 
                return -1;
            if (valueNo2 == null) 
                return 1;

            IComparable icomparable = (valueNo1 as IComparable);
            if (null != icomparable) { 
                try {
                    return icomparable.CompareTo(valueNo2); 
                } 
                catch(ArgumentException e) {
                    ExceptionBuilder.TraceExceptionWithoutRethrow(e); 
                }
            }
            return CompareWithFamilies(valueNo1, valueNo2);
        } 

        override public int CompareValueTo(int recordNo1, Object value) { 
            object valueNo1 = Get(recordNo1); 

            if (valueNo1 is IComparable) { 
                if (value.GetType() == valueNo1.GetType())
                    return((IComparable) valueNo1).CompareTo(value);
            }
 
            if (valueNo1 == value)
                return 0; 
 
            if (valueNo1 == null) {
                if (NullValue == value) { 
                    return 0;
                }
                return -1;
            } 
            if ((NullValue == value) || (null == value)) {
                return 1; 
            } 

            return CompareWithFamilies(valueNo1, value); 
        }


       private int CompareTo(object valueNo1, object valueNo2) { 
           if (valueNo1 == null)
               return -1; 
           if (valueNo2 == null) 
               return 1;
           if (valueNo1 == valueNo2) 
                return 0;
           if (valueNo1 == NullValue)
                return -1;
           if (valueNo2 == NullValue) 
                return 1;
 
           if (valueNo1 is IComparable) { 
                try{
                    return ((IComparable) valueNo1).CompareTo(valueNo2); 
                }
                catch(ArgumentException e) {
                    ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                } 
            }
            return CompareWithFamilies(valueNo1, valueNo2); 
        } 

        private int CompareWithFamilies(Object valueNo1, Object valueNo2) { 
            Families Family1 = GetFamily(valueNo1.GetType());
            Families Family2 = GetFamily(valueNo2.GetType());
            if (Family1 < Family2)
                return -1; 
            else
                if (Family1 > Family2) 
                    return 1; 
            else {
                switch (Family1) { 
                    case Families.BOOLEAN :
                        valueNo1 = Convert.ToBoolean(valueNo1, FormatProvider);
                        valueNo2 = Convert.ToBoolean(valueNo2, FormatProvider);
                        break; 
                    case Families.DATETIME:
                        valueNo1 = Convert.ToDateTime(valueNo1, FormatProvider); 
                        valueNo2 = Convert.ToDateTime(valueNo1, FormatProvider); 
                        break;
                    case Families.NUMBER : 
                        valueNo1 = Convert.ToDouble(valueNo1, FormatProvider);
                        valueNo2 = Convert.ToDouble(valueNo2, FormatProvider);
                        break;
                     case Families.ARRAY :{ 
                              Array arr1 = (Array) valueNo1;
                              Array arr2 = (Array) valueNo2; 
                              if (arr1.Length  > arr2.Length) 
                                  return 1;
                              else if (arr1.Length  < arr2.Length) 
                                  return -1;
                              else { // same number of elements
                                   for (int i = 0; i < arr1.Length; i++){
                                         int c = CompareTo(arr1.GetValue(i),arr2.GetValue(i)); 
                                         if (c != 0)
                                            return  c ; 
                                   } 
                               }
                              return 0; 
                     }
                    default :
                        valueNo1 = valueNo1.ToString();
                        valueNo2 = valueNo2.ToString(); 
                        break;
 
                } 
                return ((IComparable) valueNo1).CompareTo(valueNo2);
            } 
        }

        override public void Copy(int recordNo1, int recordNo2) {
            values[recordNo2] = values[recordNo1]; 
        }
 
        override public Object Get(int recordNo) { 
            Object value = values[recordNo];
            if (null != value) { 
                return value;
            }
            return NullValue;
        } 

        private Families GetFamily(Type dataType) { 
            switch (Type.GetTypeCode(dataType)) { 
                case TypeCode.Boolean:   return Families.BOOLEAN;
                case TypeCode.Char:      return Families.STRING; 
                case TypeCode.SByte:     return Families.STRING;
                case TypeCode.Byte:      return Families.STRING;
                case TypeCode.Int16:     return Families.NUMBER;
                case TypeCode.UInt16:    return Families.NUMBER; 
                case TypeCode.Int32:     return Families.NUMBER;
                case TypeCode.UInt32:    return Families.NUMBER; 
                case TypeCode.Int64:     return Families.NUMBER; 
                case TypeCode.UInt64:    return Families.NUMBER;
                case TypeCode.Single:    return Families.NUMBER; 
                case TypeCode.Double:    return Families.NUMBER;
                case TypeCode.Decimal:   return Families.NUMBER;
                case TypeCode.DateTime:  return Families.DATETIME;
                case TypeCode.String:    return Families.STRING; 
                default:
                    if (typeof(TimeSpan) == dataType) { 
                         return Families.DATETIME; 
                     }
                    else  if(dataType.IsArray) { 
                    	    return Families.ARRAY;
                    	}
                      else{
                              return Families.STRING; 
                    	  }
                     } 
            } 

        override public bool IsNull(int record) { 
            return (null == values[record]);
        }

        override public void Set(int recordNo, Object value) { 
            System.Diagnostics.Debug.Assert(null != value, "null value");
            if (NullValue == value) { 
                values[recordNo] = null; 
            }
            else if (DataType == typeof(Object) || DataType.IsInstanceOfType(value)) { 
                values[recordNo] = value;
            }
            else {
                Type valType = value.GetType(); 
                if (DataType == typeof(Guid) && valType == typeof(string)){
                    values[recordNo] = new Guid((string)value); 
                } 
                else if (DataType == typeof(byte[])) {
                    if (valType == typeof(Boolean)){ 
                        values[recordNo] = BitConverter.GetBytes((Boolean)value);
                    }
                    else if (valType == typeof(Char)){
                        values[recordNo] = BitConverter.GetBytes((Char)value); 
                    }
                    else if (valType == typeof(Int16)){ 
                        values[recordNo] = BitConverter.GetBytes((Int16)value); 
                    }
                    else if (valType == typeof(Int32)){ 
                        values[recordNo] = BitConverter.GetBytes((Int32)value);
                    }
                    else if (valType == typeof(Int64)){
                        values[recordNo] = BitConverter.GetBytes((Int64)value); 
                    }
                    else if (valType == typeof(UInt16)){ 
                        values[recordNo] = BitConverter.GetBytes((UInt16)value); 
                    }
                    else if (valType == typeof(UInt32)){ 
                        values[recordNo] = BitConverter.GetBytes((UInt32)value);
                    }
                    else if (valType == typeof(UInt64)){
                        values[recordNo] = BitConverter.GetBytes((UInt64)value); 
                    }
                    else if (valType == typeof(Single)){ 
                        values[recordNo] = BitConverter.GetBytes((Single)value); 
                    }
                    else if (valType == typeof(Double)){ 
                        values[recordNo] = BitConverter.GetBytes((Double)value);
                    }
                    else {
                        throw ExceptionBuilder.StorageSetFailed(); 
                    }
                } 
                else { 
                    throw ExceptionBuilder.StorageSetFailed();
                } 
            }
        }

        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; 
        }

        override public object ConvertXmlToObject(string s) {
 
            Type type = DataType; // real type of objects in this column
 
            if (type == typeof(byte[])) { 
                return Convert.FromBase64String(s);
            } 
            if (type == typeof(Type)){
                return Type.GetType(s);
            }
            if (type == typeof (Guid)){ 
                return (new Guid(s));
            } 
            if (type == typeof (Uri)){ 
                return (new Uri(s));
            } 


            if (implementsIXmlSerializable) {
                object Obj = System.Activator.CreateInstance(DataType, true); 
                StringReader strReader = new  StringReader(s);
                using (XmlTextReader xmlTextReader = new XmlTextReader(strReader)) { 
                    ((IXmlSerializable)Obj).ReadXml(xmlTextReader); 
                }
                return Obj; 
            }

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

        public override object ConvertXmlToObject(XmlReader xmlReader, XmlRootAttribute xmlAttrib) { 
            object retValue = null;
            bool isBaseCLRType = false;
            bool legacyUDT = false; // in 1.0 and 1.1 we used to call ToString on CDT obj. so if we have the same case
            // we need to handle the case when we have column type as object. 
            if (null == xmlAttrib) { // this means type implements IXmlSerializable
                Type type = null; 
                string typeName = xmlReader.GetAttribute(Keywords.MSD_INSTANCETYPE, Keywords.MSDNS); 
                if (typeName == null || typeName.Length == 0) { // No CDT polumorphism
                    string xsdTypeName = xmlReader.GetAttribute(Keywords.TYPE, Keywords.XSINS); // this xsd type: Base type polymorphism 
                    if (null != xsdTypeName && xsdTypeName.Length > 0) {
                        string [] _typename = xsdTypeName.Split(':');
                        if (_typename.Length == 2) { // split will return aray of size 1 if ":" is not there
                            if (xmlReader.LookupNamespace(_typename[0]) == Keywords.XSDNS) { 
                                xsdTypeName = _typename[1]; // trim the prefix and just continue with
                            } 
                        } // for other case, let say we have two ':' in type, the we throws (as old behavior) 
                        type = XSDSchema.XsdtoClr(xsdTypeName);
                        isBaseCLRType = true; 
                    }
                    else if (DataType == typeof(object)) {// there is no Keywords.MSD_INSTANCETYPE and no Keywords.TYPE
                            legacyUDT = true;             // see if our type is object
                    } 
                }
 
                if (legacyUDT) { // if Everett UDT, just read it and return string 
                    retValue = xmlReader.ReadString();
                } 
                else {
                    if (typeName == Keywords.TYPEINSTANCE) {
                        retValue = Type.GetType(xmlReader.ReadString());
                        xmlReader.Read(); // need to move to next node 
                    }
                    else { 
                        if (null == type) { 
                            type = (typeName == null)? DataType : Type.GetType(typeName);
                        } 

                        if (type == typeof(char) || type == typeof(Guid)) { //msdata:char and msdata:guid imply base types.
                            isBaseCLRType=true;
                        } 

                        if (type == typeof(object)) 
                            throw ExceptionBuilder.CanNotDeserializeObjectType(); 
                        if (!isBaseCLRType){
                            retValue = System.Activator.CreateInstance (type, true); 
                            Debug.Assert(xmlReader is DataTextReader, "Invalid DataTextReader is being passed to customer");
                            ((IXmlSerializable)retValue).ReadXml(xmlReader);
                        }
                        else {  // Process Base CLR type 
                        // for Element Node, if it is Empty, ReadString does not move to End Element; we need to move it
                            if(type == typeof(string) && xmlReader.NodeType == XmlNodeType.Element && xmlReader.IsEmptyElement) { 
                                retValue = string.Empty; 
                            }
                            else { 
                                retValue = xmlReader.ReadString();
                                if (type != typeof(byte[])) {
                                    retValue = SqlConvert.ChangeTypeForXML(retValue, type);
                                } 
                                else {
                                    retValue = Convert.FromBase64String(retValue.ToString()); 
                                } 
                            }
                            xmlReader.Read(); 
                        }
                    }
                }
            } 
            else{
                XmlSerializer deserializerWithRootAttribute = ObjectStorage.GetXmlSerializer(DataType, xmlAttrib); 
                retValue = deserializerWithRootAttribute.Deserialize(xmlReader); 
            }
            return retValue; 
        }

        override public string ConvertObjectToXml(object value) {
            if ((value == null) || (value == NullValue))// this case wont happen,  this is added in case if code in xml saver changes 
            	return String.Empty;
 
            Type type = DataType; 
            if (type == typeof(byte[]) || (type == typeof(object) && (value is byte[]))) {
                return Convert.ToBase64String((byte[])value); 
            }
            if ((type == typeof(Type)) || ((type == typeof(Object)) && (value is Type))) {
                return ((Type)value).AssemblyQualifiedName;
            } 

            if (!IsTypeCustomType(value.GetType())){ // Guid and Type had TypeCode.Object 
               return (string)SqlConvert.ChangeTypeForXML(value, typeof(string)); 
            }
 
            if (Type.GetTypeCode(value.GetType()) != TypeCode.Object) {
            	return value.ToString();
            }
 
            StringWriter strwriter = new StringWriter(FormatProvider);
            if (implementsIXmlSerializable) { 
                using (XmlTextWriter xmlTextWriter = new XmlTextWriter (strwriter)) { 
                    ((IXmlSerializable)value).WriteXml(xmlTextWriter);
                } 
                return (strwriter.ToString());
             }

            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) { // implements IXmlSerializable
                Debug.Assert(xmlWriter is DataTextWriter, "Invalid DataTextWriter is being passed to customer");
                ((IXmlSerializable)value).WriteXml(xmlWriter);
            } 
            else {
                XmlSerializer serializerWithRootAttribute = ObjectStorage.GetXmlSerializer(value.GetType(), 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];
            bool isNull = IsNull(record); 
            nullbits.Set(storeIndex, isNull);

            if (!isNull && (typedStore[storeIndex] is DateTime)) {
                DateTime dt = (DateTime)typedStore[storeIndex]; 
                if (dt.Kind == DateTimeKind.Local) {
                    typedStore[storeIndex] = DateTime.SpecifyKind(dt.ToUniversalTime(), DateTimeKind.Local); 
                } 
            }
        } 

        override protected void SetStorage(object store, BitArray nullbits) {
            values = (Object[]) store;
            for(int i = 0; i < values.Length; i++) { 
                if (values[i] is DateTime) {
                    DateTime dt = (DateTime) values[i]; 
                    if (dt.Kind == DateTimeKind.Local) { 
                        values[i] = (DateTime.SpecifyKind(dt, DateTimeKind.Utc)).ToLocalTime();
                     } 
                }
            }
//            SetNullStorage(nullbits); -> No need to set bits,
        } 

        // 
        private static readonly object _tempAssemblyCacheLock = new object(); 
        private static Dictionary, XmlSerializer> _tempAssemblyCache;
        private static readonly XmlSerializerFactory _serializerFactory = new XmlSerializerFactory(); 

        internal static XmlSerializer GetXmlSerializer(Type type)
        {   // use factory which caches XmlSerializer as necessary
            XmlSerializer serializer = _serializerFactory.CreateSerializer(type); 
            return serializer;
        } 
 
        internal static XmlSerializer GetXmlSerializer(Type type, XmlRootAttribute attribute)
        { 
            XmlSerializer serializer = null;
            KeyValuePair key = new KeyValuePair(type,attribute);

            Dictionary, XmlSerializer> cache = _tempAssemblyCache; 
            if ((null == cache) || !cache.TryGetValue(key, out serializer))
            {   // not in cache, try again with lock because it may need to grow 
                lock(_tempAssemblyCacheLock) 
                {
                    cache = _tempAssemblyCache; 
                    if ((null == cache) || !cache.TryGetValue(key, out serializer))
                    {   // if still not in cache, make cache larger and add new XmlSerializer
                        if (null != cache)
                        {   // create larger cache, because dictionary is not reader/writer safe 
                            // copy cache so that all readers don't take lock - only potential new writers
                            // same logic used by DbConnectionFactory 
                            Dictionary, XmlSerializer> tmp = 
                                new Dictionary, XmlSerializer>(
                                    1+cache.Count, TempAssemblyComparer.Default); 
                            foreach (KeyValuePair, XmlSerializer> entry in cache)
                            {   // copy contents from old cache to new cache
                                tmp.Add(entry.Key, entry.Value);
                            } 
                            cache = tmp;
                        } 
                        else 
                        {   // initial creation of cache
                            cache = new Dictionary, XmlSerializer>( 
                                TempAssemblyComparer.Default);
                        }
                        // attribute is modifiable - but usuage from XmlSaver & XmlDataLoader & XmlDiffLoader
                        // the instances are not modified, but to be safe - copy the XmlRootAttribute before caching 
                        key = new KeyValuePair(type, new XmlRootAttribute());
                        key.Value.ElementName = attribute.ElementName; 
                        key.Value.Namespace = attribute.Namespace; 
                        key.Value.DataType = attribute.DataType;
                        key.Value.IsNullable = attribute.IsNullable; 

                        serializer = _serializerFactory.CreateSerializer(type, attribute);
                        cache.Add(key, serializer);
                        _tempAssemblyCache = cache; 
                    }
                } 
            } 
            return serializer;
        } 

        private class TempAssemblyComparer : IEqualityComparer>
        {
            internal static readonly IEqualityComparer> Default = new TempAssemblyComparer(); 

            private TempAssemblyComparer() { } 
 
            public bool Equals(KeyValuePair x, KeyValuePair y)
            { 
                return ((x.Key == y.Key) &&                                         // same type
                        (((x.Value == null) && (y.Value == null)) ||                // XmlRootAttribute both null
                         ((x.Value != null) && (y.Value != null) &&                 // XmlRootAttribute both with value
                          (x.Value.ElementName == y.Value.ElementName) &&           // all attribute elements are equal 
                          (x.Value.Namespace == y.Value.Namespace) &&
                          (x.Value.DataType == y.Value.DataType) && 
                          (x.Value.IsNullable == y.Value.IsNullable)))); 
            }
 
            public int GetHashCode(KeyValuePair obj)
            {
                return unchecked(obj.Key.GetHashCode() + obj.Value.ElementName.GetHashCode());
            } 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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