File: fx\src\data\System\Data\Common\SQLTypes\SqlXmlStorage.cs
Project: ndp\System.Data.csproj (System.Data)
//------------------------------------------------------------------------------
// <copyright file="SqlXmlStorage.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>                                                                
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
// <owner current="false" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
 
namespace System.Data.Common {
    using System;
    using System.Xml;
    using System.IO;
    using System.Xml.Serialization;
    using System.Data.SqlTypes;
    using System.Diagnostics;
    using System.Text;
    using System.Collections;
    internal sealed class SqlXmlStorage : DataStorage {
 
        private SqlXml[] values;
 
        public SqlXmlStorage(DataColumn column)
        : base(column, typeof(SqlXml), SqlXml.Null, SqlXml.Null, StorageType.Empty) {
        }
 
        override public Object Aggregate(int[] records, AggregateType kind) {
            try {
                switch (kind) {
                    case AggregateType.First:
                        if (records.Length > 0) {
                            return values[records[0]];
                        }
                        return null;// no data => null
 
                    case AggregateType.Count:
                        int count = 0;
                        for (int i = 0; i < records.Length; i++) {
                            if (!IsNull(records[i]))
                                count++;
                        }
                        return count;
                }
            }
            catch (OverflowException) {
                throw ExprException.Overflow(typeof(SqlXml));
            }
            throw ExceptionBuilder.AggregateException(kind, DataType);
        }
 
        override public int Compare(int recordNo1, int recordNo2) {
            //return values[recordNo1].CompareTo(values[recordNo2]);
            return 0;
        }
 
        override public int CompareValueTo(int recordNo, Object value) {
            // SqlXml valueNo2 = ((value == null)||(value == DBNull.Value))? SqlXml.Null : (SqlXml)value;
            // return values[recordNo].CompareTo(valueNo2);
            return 0;
        }
 
        override public void Copy(int recordNo1, int recordNo2) {
            values[recordNo2] = values[recordNo1];
        }
 
        override public Object Get(int record) {
            return values[record];
        }
 
        override public bool IsNull(int record) {
            return (values[record].IsNull);
        }
 
        override public void Set(int record, Object value) {
            if ((value ==  DBNull.Value) || (value == null)){
                values[record] = SqlXml.Null;
            }
            else {
                values[record] = (SqlXml)value;            
            }
        }
 
        override public void SetCapacity(int capacity) {
            SqlXml[] newValues = new SqlXml[capacity];
            if (null != values) {
                Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
            }
            values = newValues;
        }
 
        override public object ConvertXmlToObject(string s) {
            XmlTextReader reader =  new XmlTextReader(s, XmlNodeType.Element, null) ;
            return (new SqlXml(reader));
            
 
/*            SqlXml newValue = new SqlXml();
            
            StringReader strReader = new  StringReader(s);
            XmlTextReader xmlTextReader = new XmlTextReader(strReader);
            ((IXmlSerializable)newValue).ReadXml(xmlTextReader);
            xmlTextReader.Close();
            return newValue;
*/
        }
 
        override public string ConvertObjectToXml(object value) {
            SqlXml reader = (SqlXml) value;
            if (reader.IsNull)
                return ADP.StrEmpty;
            else
                return reader.Value;        // SqlXml.Value returns string
 
        }
        
        override protected object GetEmptyStorage(int recordCount) {
            return new SqlXml[recordCount];
        }
        
        override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
            SqlXml[] typedStore = (SqlXml[]) store; 
            typedStore[storeIndex] = values[record];
            nullbits.Set(storeIndex, IsNull(record));
        }
        
        override protected void SetStorage(object store, BitArray nullbits) {
            values = (SqlXml[]) store; 
            //SetNullStorage(nullbits);
        }         
    }
}