Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / Int32Storage.cs / 1 / Int32Storage.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 Int32Storage : DataStorage { private const Int32 defaultValue = 0; // Convert.ToInt32(null) private Int32[] values; internal Int32Storage(DataColumn column) : base(column, typeof(Int32), defaultValue) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: Int64 sum = 0; foreach (int record in records) { if (HasValue(record)) { checked { sum += values[record];} hasData = true; } } if (hasData) { return sum; } return NullValue; case AggregateType.Mean: Int64 meanSum = 0; int meanCount = 0; foreach (int record in records) { if (HasValue(record)) { checked { meanSum += (Int64)values[record];} meanCount++; hasData = true; } } if (hasData) { Int32 mean; checked {mean = (Int32)(meanSum / 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: Int32 min = Int32.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: Int32 max = Int32.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: count = 0; for (int i = 0; i < records.Length; i++) { if (HasValue(records[i])) { count++; } } return count; } } catch (OverflowException) { throw ExprException.Overflow(typeof(Int32)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { Int32 valueNo1 = values[recordNo1]; Int32 valueNo2 = values[recordNo2]; if (valueNo1 == defaultValue || valueNo2 == 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 Int32.CompareTo(Int32) } 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); } Int32 valueNo1 = values[recordNo]; if ((defaultValue == valueNo1) && !HasValue(recordNo)) { return -1; } return valueNo1.CompareTo((Int32)value); //return(valueNo1 < valueNo2 ? -1 : (valueNo1 > valueNo2 ? 1 : 0)); // similar to Int32.CompareTo(Int32) } public override object ConvertValue(object value) { if (NullValue != value) { if (null != value) { value = ((IConvertible)value).ToInt32(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) { Int32 value = values[record]; if (value != Int32Storage.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).ToInt32(FormatProvider); SetNullBit(record, false); // WebData 105962 } } override public void SetCapacity(int capacity) { Int32[] newValues = new Int32[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.ToInt32(s); } override public string ConvertObjectToXml(object value) { return XmlConvert.ToString((Int32)value); } override protected object GetEmptyStorage(int recordCount) { return new Int32[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { Int32[] typedStore = (Int32[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, !HasValue(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (Int32[]) 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
- ListBoxItemAutomationPeer.cs
- ApplicationActivator.cs
- Table.cs
- WasNotInstalledException.cs
- Int16Storage.cs
- MailWebEventProvider.cs
- FrameworkTemplate.cs
- CalculatedColumn.cs
- NamedPipeDuplicateContext.cs
- ImageKeyConverter.cs
- DBPropSet.cs
- MsmqTransportElement.cs
- UriTemplateTable.cs
- FlowLayoutPanel.cs
- WindowsScrollBar.cs
- QilStrConcatenator.cs
- ResourceReader.cs
- ExtensionFile.cs
- InputBinder.cs
- Configuration.cs
- FixedHyperLink.cs
- GridViewRow.cs
- HuffModule.cs
- TextRenderer.cs
- DataView.cs
- List.cs
- XmlReader.cs
- TextEndOfSegment.cs
- TemplateBamlTreeBuilder.cs
- Exceptions.cs
- BitmapEffectDrawing.cs
- DataGridItemCollection.cs
- TakeQueryOptionExpression.cs
- PagedDataSource.cs
- ExpandSegmentCollection.cs
- SoapAttributeAttribute.cs
- XamlRtfConverter.cs
- HitTestDrawingContextWalker.cs
- DataGridSortCommandEventArgs.cs
- TimeoutValidationAttribute.cs
- DbModificationCommandTree.cs
- AttributeInfo.cs
- CapabilitiesAssignment.cs
- Italic.cs
- ClientFormsAuthenticationCredentials.cs
- Authorization.cs
- TextSpan.cs
- TimeSpanValidator.cs
- SqlCacheDependencyDatabaseCollection.cs
- ListMarkerSourceInfo.cs
- Substitution.cs
- PropertyOverridesTypeEditor.cs
- Substitution.cs
- Setter.cs
- ExtractCollection.cs
- ExceptionHandlersDesigner.cs
- Attributes.cs
- TrackingServices.cs
- DPAPIProtectedConfigurationProvider.cs
- DeclarativeCatalogPartDesigner.cs
- SkipStoryboardToFill.cs
- PeerInvitationResponse.cs
- StreamWriter.cs
- SystemGatewayIPAddressInformation.cs
- ThrowHelper.cs
- IPAddressCollection.cs
- ProfileBuildProvider.cs
- CollectionView.cs
- AuthenticationException.cs
- WebPartConnection.cs
- FixedSOMTableCell.cs
- CompilerParameters.cs
- HttpHandlerAction.cs
- TemplatedMailWebEventProvider.cs
- ToolStripItemClickedEventArgs.cs
- WebPartTransformerAttribute.cs
- FileRecordSequence.cs
- SimpleRecyclingCache.cs
- Activity.cs
- AdornedElementPlaceholder.cs
- ScrollPattern.cs
- VideoDrawing.cs
- DBCommandBuilder.cs
- precedingsibling.cs
- TimeSpanValidator.cs
- ContentControl.cs
- TextPenaltyModule.cs
- PageCatalogPartDesigner.cs
- CompilerErrorCollection.cs
- SiteOfOriginContainer.cs
- SwitchElementsCollection.cs
- DateTimeSerializationSection.cs
- EntityChangedParams.cs
- DesignerLoader.cs
- EmptyEnumerable.cs
- HostingPreferredMapPath.cs
- ClientBuildManagerCallback.cs
- RoleManagerEventArgs.cs
- _NegotiateClient.cs
- _SpnDictionary.cs