DateTimeStorage.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / DateTimeStorage.cs / 1 / DateTimeStorage.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

namespace System.Data.Common { 
    using System;
    using System.Xml;
    using System.Data.SqlTypes;
    using System.Collections; 

    internal sealed class DateTimeStorage : DataStorage { 
 
        private static readonly DateTime defaultValue = DateTime.MinValue;
 
        private DateTime[] values;

        internal DateTimeStorage(DataColumn column)
        : base(column, typeof(DateTime), defaultValue) { 
        }
 
        override public Object Aggregate(int[] records, AggregateType kind) { 
            bool hasData = false;
            try { 
                switch (kind) {
                    case AggregateType.Min:
                        DateTime min = DateTime.MaxValue;
                        for (int i = 0; i < records.Length; i++) { 
                            int record = records[i];
                            if (HasValue(record)) { 
                                min=(DateTime.Compare(values[record],min) < 0) ? values[record] : min; 
                                hasData = true;
                            } 
                        }
                        if (hasData) {
                            return min;
                        } 
                        return NullValue;
 
                    case AggregateType.Max: 
                        DateTime max = DateTime.MinValue;
                        for (int i = 0; i < records.Length; i++) { 
                            int record = records[i];
                            if (HasValue(record)) {
                                max=(DateTime.Compare(values[record],max) >= 0) ? values[record] : max;
                                hasData = true; 
                            }
                        } 
                        if (hasData) { 
                            return max;
                        } 
                        return NullValue;

                    case AggregateType.First:
                        if (records.Length > 0) { 
                            return values[records[0]];
                        } 
                        return null; 

                    case AggregateType.Count: 
                        int count = 0;
                        for (int i = 0; i < records.Length; i++) {
                            if (HasValue(records[i])) {
                                count++; 
                            }
                        } 
                        return count; 
                }
            } 
            catch (OverflowException) {
                throw ExprException.Overflow(typeof(DateTime));
            }
            throw ExceptionBuilder.AggregateException(kind, DataType); 
        }
 
        override public int Compare(int recordNo1, int recordNo2) { 
            DateTime valueNo1 = values[recordNo1];
            DateTime valueNo2 = values[recordNo2]; 

            if (valueNo1 == defaultValue || valueNo2 == defaultValue) {
                int bitCheck = CompareBits(recordNo1, recordNo2);
                if (0 != bitCheck) { 
                    return bitCheck;
                } 
            } 
            return DateTime.Compare(valueNo1, valueNo2);
        } 

        public override int CompareValueTo(int recordNo, object value) {
            System.Diagnostics.Debug.Assert(0 <= recordNo, "Invalid record");
            System.Diagnostics.Debug.Assert(null != value, "null value"); 

            if (NullValue == value) { 
                return (HasValue(recordNo) ? 1 : 0); 
            }
 
            DateTime valueNo1 = values[recordNo];
            if ((defaultValue == valueNo1) && !HasValue(recordNo)) {
                return -1;
            } 
            return DateTime.Compare(valueNo1, (DateTime)value);
        } 
 
        public override object ConvertValue(object value) {
            if (NullValue != value) { 
                if (null != value) {
                    value = ((IConvertible)value).ToDateTime(FormatProvider);
                }
                else { 
                    value = NullValue;
                } 
            } 
            return value;
        } 

        override public void Copy(int recordNo1, int recordNo2) {
            CopyBits(recordNo1, recordNo2);
            values[recordNo2] = values[recordNo1]; 
        }
 
        override public Object Get(int record) { 
            //
            DateTime value = values[record]; 
            if ((value != defaultValue) || HasValue(record)) {
                return value;
            }
            return NullValue; 
        }
 
        override public void Set(int record, Object value) { 
            System.Diagnostics.Debug.Assert(null != value, "null value");
            if (NullValue == value) { 
                values[record] = defaultValue;
                SetNullBit(record, true);
            }
            else { 
                DateTime retVal;
                DateTime tmpValue = ((IConvertible)value).ToDateTime(FormatProvider); 
                switch (DateTimeMode) { 
                    case DataSetDateTime.Utc:
                        if (tmpValue.Kind == DateTimeKind.Utc) { 
                            retVal = tmpValue;
                        }
                        else if (tmpValue.Kind == DateTimeKind.Local) {
                            retVal = tmpValue.ToUniversalTime(); 
                        }
                        else { 
                            retVal = DateTime.SpecifyKind(tmpValue, DateTimeKind.Utc); 
                        }
                        break; 
                    case DataSetDateTime.Local:
                        if (tmpValue.Kind == DateTimeKind.Local) {
                            retVal = tmpValue;
                        } 
                        else if (tmpValue.Kind == DateTimeKind.Utc) {
                            retVal = tmpValue.ToLocalTime(); 
                        } 
                        else {
                            retVal =  DateTime.SpecifyKind(tmpValue, DateTimeKind.Local); 
                        }
                        break;
                    case DataSetDateTime.Unspecified:
                    case DataSetDateTime.UnspecifiedLocal: 
                        retVal = DateTime.SpecifyKind(tmpValue, DateTimeKind.Unspecified);
                        break; 
                    default: 
                        throw ExceptionBuilder.InvalidDateTimeMode(DateTimeMode);
                } 
                values[record] = retVal;
                SetNullBit(record, false);
            }
        } 

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

        override public object ConvertXmlToObject(string s) { 
            object retValue; 
            if (DateTimeMode == DataSetDateTime.UnspecifiedLocal) {
                retValue = XmlConvert.ToDateTime(s, XmlDateTimeSerializationMode.Unspecified); 
            }
            else {
                retValue = XmlConvert.ToDateTime(s, XmlDateTimeSerializationMode.RoundtripKind);
            } 
            return retValue;
        } 
 
        override public string ConvertObjectToXml(object value) {
            string retValue; 
            if (DateTimeMode == DataSetDateTime.UnspecifiedLocal) {
                retValue = XmlConvert.ToString((DateTime)value, XmlDateTimeSerializationMode.Local);
            }
            else { 
                retValue = XmlConvert.ToString((DateTime)value, XmlDateTimeSerializationMode.RoundtripKind);
            } 
            return retValue; 
        }
 
        override protected object GetEmptyStorage(int recordCount) {
            return new DateTime[recordCount];
        }
 
        override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
            DateTime[] typedStore = (DateTime[]) store; 
            bool isnull = !HasValue(record); 
            if (isnull || ( 0 == (DateTimeMode & DataSetDateTime.Local))) {
                typedStore[storeIndex] = values[record]; // already universal time 
            }
            else {
                typedStore[storeIndex] = values[record].ToUniversalTime();
            } 
            nullbits.Set(storeIndex, isnull);
        } 
 
        override protected void SetStorage(object store, BitArray nullbits) {
            values = (DateTime[]) store; 
            SetNullStorage(nullbits);
            if (DateTimeMode == DataSetDateTime.UnspecifiedLocal) {
                for (int i = 0; i < values.Length; i++) {
                    if (HasValue(i)) { 
                        values[i] = DateTime.SpecifyKind(values[i].ToLocalTime(), DateTimeKind.Unspecified); //Strip the kind for UnspecifiedLocal.
                    } 
                } 
            }
            else if (DateTimeMode == DataSetDateTime.Local) { 
                for (int i = 0; i < values.Length; i++) {
                    if (HasValue(i)) {
                        values[i] = values[i].ToLocalTime();
                    } 
                }
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DateTimeStorage.cs source code in C# .NET

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