Code:
/ FX-1434 / FX-1434 / 1.0 / 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. 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