Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / UInt64Storage.cs / 1 / UInt64Storage.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 UInt64Storage : DataStorage { private static readonly UInt64 defaultValue = UInt64.MinValue; private UInt64[] values; public UInt64Storage(DataColumn column) : base(column, typeof(UInt64), defaultValue) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: UInt64 sum = defaultValue; foreach (int record in records) { if (HasValue(record)) { checked { sum += values[record];} hasData = true; } } if (hasData) { return sum; } return NullValue; case AggregateType.Mean: Decimal meanSum = (Decimal)defaultValue; int meanCount = 0; foreach (int record in records) { if (HasValue(record)) { checked { meanSum += (Decimal)values[record];} meanCount++; hasData = true; } } if (hasData) { UInt64 mean; checked {mean = (UInt64)(Decimal)(meanSum / (Decimal)meanCount);} return mean; } return NullValue; case AggregateType.Var: case AggregateType.StDev: int count = 0; double var = 0.0f; double prec = 0.0f; double dsum = 0.0f; double sqrsum = 0.0f; foreach (int record in records) { if (HasValue(record)) { dsum += (double)values[record]; sqrsum += (double)values[record]*(double)values[record]; count++; } } if (count > 1) { var = ((double)count * sqrsum - (dsum * dsum)); prec = var / (dsum * dsum); // we are dealing with the risk of a cancellation error // double is guaranteed only for 15 digits so a difference // with a result less than 1e-15 should be considered as zero if ((prec < 1e-15) || (var <0)) var = 0; else var = var / (count * (count -1)); if (kind == AggregateType.StDev) { return Math.Sqrt(var); } return var; } return NullValue; case AggregateType.Min: UInt64 min = UInt64.MaxValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (HasValue(record)) { min=Math.Min(values[record], min); hasData = true; } } if (hasData) { return min; } return NullValue; case AggregateType.Max: UInt64 max = UInt64.MinValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (HasValue(record)) { max=Math.Max(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: return base.Aggregate(records, kind); } } catch (OverflowException) { throw ExprException.Overflow(typeof(UInt64)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { UInt64 valueNo1 = values[recordNo1]; UInt64 valueNo2 = values[recordNo2]; if (valueNo1.Equals(defaultValue) || valueNo2.Equals(defaultValue)) { int bitCheck = CompareBits(recordNo1, recordNo2); if (0 != bitCheck) return bitCheck; } //return valueNo1.CompareTo(valueNo2); return(valueNo1 < valueNo2 ? -1 : (valueNo1 > valueNo2 ? 1 : 0)); // similar to UInt64.CompareTo(UInt64) } 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); } UInt64 valueNo1 = values[recordNo]; if ((defaultValue == valueNo1) && !HasValue(recordNo)) { return -1; } return valueNo1.CompareTo((UInt64)value); //return(valueNo1 < valueNo2 ? -1 : (valueNo1 > valueNo2 ? 1 : 0)); // similar to UInt64.CompareTo(UInt64) } public override object ConvertValue(object value) { if (NullValue != value) { if (null != value) { value = ((IConvertible)value).ToUInt64(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) { UInt64 value = values[record]; if (!value.Equals(defaultValue)) { return value; } return GetBits(record); } 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 { values[record] = ((IConvertible)value).ToUInt64(FormatProvider); SetNullBit(record, false); } } override public void SetCapacity(int capacity) { UInt64[] newValues = new UInt64[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) { return XmlConvert.ToUInt64(s); } override public string ConvertObjectToXml(object value) { return XmlConvert.ToString((UInt64)value); } override protected object GetEmptyStorage(int recordCount) { return new UInt64[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { UInt64[] typedStore = (UInt64[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, !HasValue(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (UInt64[]) store; SetNullStorage(nullbits); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- HandlerBase.cs
- WebPermission.cs
- ComponentCommands.cs
- EncoderFallback.cs
- Pointer.cs
- TreeSet.cs
- COM2IDispatchConverter.cs
- _DomainName.cs
- Request.cs
- CompoundFileStreamReference.cs
- MsmqIntegrationMessagePool.cs
- WindowsRichEditRange.cs
- DecoderReplacementFallback.cs
- RegexGroup.cs
- Viewport3DVisual.cs
- Timer.cs
- AssemblyResourceLoader.cs
- DataSetSchema.cs
- LinearGradientBrush.cs
- OleDbParameter.cs
- GridViewUpdateEventArgs.cs
- ExcCanonicalXml.cs
- DataControlField.cs
- ResourceDictionary.cs
- MD5CryptoServiceProvider.cs
- FakeModelPropertyImpl.cs
- LocatorBase.cs
- ObjectSelectorEditor.cs
- DefaultValueConverter.cs
- AnnotationService.cs
- ViewManager.cs
- DesignerActionService.cs
- RegexStringValidator.cs
- EntityWrapper.cs
- StyleBamlRecordReader.cs
- ValuePattern.cs
- PrimitiveType.cs
- EventSetterHandlerConverter.cs
- EdmSchemaAttribute.cs
- PriorityBindingExpression.cs
- Adorner.cs
- InstanceData.cs
- RandomNumberGenerator.cs
- DataGridViewCellPaintingEventArgs.cs
- TraceContext.cs
- UniformGrid.cs
- WebOperationContext.cs
- BasicHttpSecurityElement.cs
- ExpandButtonVisibilityConverter.cs
- CodeArrayIndexerExpression.cs
- GridViewSelectEventArgs.cs
- ThicknessKeyFrameCollection.cs
- InternalControlCollection.cs
- DeclarationUpdate.cs
- XmlElementAttribute.cs
- MetaTableHelper.cs
- ToolStripContainer.cs
- CryptoProvider.cs
- IdentityReference.cs
- QueryCursorEventArgs.cs
- DataStorage.cs
- CompilationUnit.cs
- DataServiceQuery.cs
- GridViewEditEventArgs.cs
- SqlNodeTypeOperators.cs
- Normalization.cs
- UnhandledExceptionEventArgs.cs
- AnchorEditor.cs
- ValueProviderWrapper.cs
- DeviceFilterEditorDialog.cs
- QilBinary.cs
- TimerElapsedEvenArgs.cs
- InputReportEventArgs.cs
- ZipIOExtraFieldZip64Element.cs
- ThumbAutomationPeer.cs
- DynamicUpdateCommand.cs
- RedistVersionInfo.cs
- _ConnectStream.cs
- DecoratedNameAttribute.cs
- BlurBitmapEffect.cs
- ProtocolInformationReader.cs
- InputBinding.cs
- NonVisualControlAttribute.cs
- CheckBoxStandardAdapter.cs
- ExtensibleClassFactory.cs
- ModifierKeysValueSerializer.cs
- SimpleApplicationHost.cs
- StyleXamlParser.cs
- MimeXmlReflector.cs
- TransactionFilter.cs
- ColumnWidthChangingEvent.cs
- GlobalizationSection.cs
- PriorityQueue.cs
- XmlMembersMapping.cs
- IPAddress.cs
- UnitySerializationHolder.cs
- Fault.cs
- _SingleItemRequestCache.cs
- ObjectPersistData.cs
- Block.cs