Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / SByteStorage.cs / 1 / SByteStorage.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 SByteStorage : DataStorage { private const SByte defaultValue = 0; private SByte[] values; public SByteStorage(DataColumn column) : base(column, typeof(SByte), defaultValue) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: Int64 sum = defaultValue; foreach (int record in records) { if (IsNull(record)) continue; checked { sum += values[record];} hasData = true; } if (hasData) { return sum; } return NullValue; case AggregateType.Mean: Int64 meanSum = (Int64)defaultValue; int meanCount = 0; foreach (int record in records) { if (IsNull(record)) continue; checked { meanSum += (Int64)values[record];} meanCount++; hasData = true; } if (hasData) { SByte mean; checked {mean = (SByte)(meanSum / meanCount);} return mean; } return NullValue; case AggregateType.Var: case AggregateType.StDev: int count = 0; double var = (double)defaultValue; double prec = (double)defaultValue; double dsum = (double)defaultValue; double sqrsum = (double)defaultValue; foreach (int record in records) { if (IsNull(record)) continue; 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: SByte min = SByte.MaxValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; min=Math.Min(values[record], min); hasData = true; } if (hasData) { return min; } return NullValue; case AggregateType.Max: SByte max = SByte.MinValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; 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(SByte)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { SByte valueNo1 = values[recordNo1]; SByte 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); // copied from SByte.CompareTo(SByte) } 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) { if (IsNull(recordNo)) { return 0; } return 1; } SByte valueNo1 = values[recordNo]; if ((defaultValue == valueNo1) && IsNull(recordNo)) { return -1; } return valueNo1.CompareTo((SByte)value); //return(valueNo1 - valueNo2); // copied from SByte.CompareTo(SByte) } public override object ConvertValue(object value) { if (NullValue != value) { if (null != value) { value = ((IConvertible)value).ToSByte(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) { SByte 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).ToSByte(FormatProvider); SetNullBit(record, false); } } override public void SetCapacity(int capacity) { SByte[] newValues = new SByte[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.ToSByte(s); } override public string ConvertObjectToXml(object value) { return XmlConvert.ToString((SByte)value); } override protected object GetEmptyStorage(int recordCount) { return new SByte[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { SByte[] typedStore = (SByte[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (SByte[]) 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
- PeerToPeerException.cs
- HtmlTableCellCollection.cs
- RealProxy.cs
- ViewManager.cs
- CultureSpecificCharacterBufferRange.cs
- LocalizationComments.cs
- ClientFormsAuthenticationMembershipProvider.cs
- TextSelectionHighlightLayer.cs
- WebPartTransformerAttribute.cs
- BridgeDataReader.cs
- CollectionView.cs
- RelatedEnd.cs
- ListComponentEditorPage.cs
- XmlCompatibilityReader.cs
- IntegerFacetDescriptionElement.cs
- AdapterSwitches.cs
- Matrix.cs
- UserUseLicenseDictionaryLoader.cs
- MetricEntry.cs
- BindingCompleteEventArgs.cs
- DesignerEditorPartChrome.cs
- SafeUserTokenHandle.cs
- StreamResourceInfo.cs
- TextEditorSelection.cs
- OfTypeExpression.cs
- StylusDevice.cs
- DataSourceIDConverter.cs
- FileCodeGroup.cs
- SrgsRuleRef.cs
- Section.cs
- ErrorWebPart.cs
- TaskHelper.cs
- NoneExcludedImageIndexConverter.cs
- ZoneIdentityPermission.cs
- HMACSHA512.cs
- LocalizableAttribute.cs
- AttributeEmitter.cs
- ClientSettings.cs
- ActivityDesignerHelper.cs
- Binding.cs
- TextTreePropertyUndoUnit.cs
- ConsoleEntryPoint.cs
- RootBuilder.cs
- UshortList2.cs
- CompressionTransform.cs
- CustomCredentialPolicy.cs
- SchemaReference.cs
- ExpandSegmentCollection.cs
- SHA256.cs
- DataGridViewUtilities.cs
- Transform3D.cs
- CodeNamespaceCollection.cs
- WebPartDisplayModeCancelEventArgs.cs
- ActivationArguments.cs
- ApplicationFileParser.cs
- FormViewInsertEventArgs.cs
- XmlWrappingReader.cs
- NavigationCommands.cs
- WebPartConnection.cs
- DefaultPropertyAttribute.cs
- SystemIcons.cs
- Pair.cs
- AuthorizationSection.cs
- AliasGenerator.cs
- LocalServiceSecuritySettings.cs
- EndpointIdentity.cs
- Emitter.cs
- PartitionResolver.cs
- WeakEventManager.cs
- DetailsViewUpdateEventArgs.cs
- BamlRecords.cs
- NonBatchDirectoryCompiler.cs
- Panel.cs
- ExpressionPrefixAttribute.cs
- DecoderNLS.cs
- CornerRadiusConverter.cs
- EntityFrameworkVersions.cs
- Queue.cs
- ListenerConnectionDemuxer.cs
- AppSettingsExpressionBuilder.cs
- DataGridDesigner.cs
- Item.cs
- DateTimeConverter.cs
- CheckBoxDesigner.cs
- PolicyValidationException.cs
- RubberbandSelector.cs
- EntityDataSourceSelectingEventArgs.cs
- MarkedHighlightComponent.cs
- SrgsRuleRef.cs
- CodeStatementCollection.cs
- HtmlInputReset.cs
- IResourceProvider.cs
- LogManagementAsyncResult.cs
- Atom10FormatterFactory.cs
- XmlName.cs
- SchemaElementDecl.cs
- MaskInputRejectedEventArgs.cs
- SHA512Managed.cs
- CalendarDay.cs
- ContentPlaceHolder.cs