SQLDateTimeStorage.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLDateTimeStorage.cs / 1 / SQLDateTimeStorage.cs
                        

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

namespace System.Data.Common { 
    using System;
    using System.Xml;
    using System.Data.SqlTypes;
    using System.Diagnostics; 
    using System.Globalization;
    using System.IO; 
    using System.Xml.Serialization; 
    using System.Collections;
 
    internal sealed class SqlDateTimeStorage : DataStorage {

        private SqlDateTime[] values;
 
        public SqlDateTimeStorage(DataColumn column)
        : base(column, typeof(SqlDateTime), SqlDateTime.Null, SqlDateTime.Null) { 
        } 

        override public Object Aggregate(int[] records, AggregateType kind) { 
            bool hasData = false;
            try {
                switch (kind) {
                    case AggregateType.Min: 
                        SqlDateTime min = SqlDateTime.MaxValue;
                        for (int i = 0; i < records.Length; i++) { 
                            int record = records[i]; 
                            if (IsNull(record))
                                continue; 
                            if ((SqlDateTime.LessThan(values[record], min)).IsTrue)
                                min = values[record];
                            hasData = true;
                        } 
                        if (hasData) {
                            return min; 
                        } 
                        return NullValue;
 
                    case AggregateType.Max:
                        SqlDateTime max = SqlDateTime.MinValue;
                        for (int i = 0; i < records.Length; i++) {
                            int record = records[i]; 
                            if (IsNull(record))
                                continue; 
                            if ((SqlDateTime.GreaterThan(values[record], max)).IsTrue) 
                                max = values[record];
                            hasData = true; 
                        }
                        if (hasData) {
                            return max;
                        } 
                        return NullValue;
 
                    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(SqlDateTime));
            } 
            throw ExceptionBuilder.AggregateException(kind, DataType); 
        }
 
        override public int Compare(int recordNo1, int recordNo2) {
            return values[recordNo1].CompareTo(values[recordNo2]);
        }
 
        override public int CompareValueTo(int recordNo, Object value) {
            return values[recordNo].CompareTo((SqlDateTime)value); 
        } 

        override public object ConvertValue(object value) { 
            if (null != value) {
                return SqlConvert.ConvertToSqlDateTime(value);
            }
            return NullValue; 
        }
 
        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) {
            values[record] =   SqlConvert.ConvertToSqlDateTime(value);
        }
 
        override public void SetCapacity(int capacity) {
            SqlDateTime[] newValues = new SqlDateTime[capacity]; 
            if (null != values) { 
                Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
            } 
            values = newValues;
        }

        override public object ConvertXmlToObject(string s) { 
            SqlDateTime newValue = new SqlDateTime();
            string tempStr =string.Concat("", s, ""); // this is done since you can give fragmet to reader, bug 98767 
            StringReader strReader = new  StringReader(tempStr); 

            IXmlSerializable tmp = newValue; 

            using (XmlTextReader xmlTextReader = new XmlTextReader(strReader)) {
                tmp.ReadXml(xmlTextReader);
            } 
            return ((SqlDateTime)tmp);
        } 
 
        override public string ConvertObjectToXml(object value) {
            Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here"); 
            Debug.Assert((value.GetType() == typeof(SqlDateTime)), "wrong input type");

            StringWriter strwriter = new StringWriter(FormatProvider);
 
            using (XmlTextWriter xmlTextWriter = new XmlTextWriter (strwriter)) {
                ((IXmlSerializable)value).WriteXml(xmlTextWriter); 
            } 
            return (strwriter.ToString ());
        } 

        override protected object GetEmptyStorage(int recordCount) {
            return new SqlDateTime[recordCount];
        } 

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

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

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

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