Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / Data / System / Data / Common / ByteStorage.cs / 1 / ByteStorage.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 ByteStorage : DataStorage { private const Byte defaultValue = 0; private Byte[] values; internal ByteStorage(DataColumn column) : base(column, typeof(Byte), 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 (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) { Byte mean; checked {mean = (Byte)(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: Byte min = Byte.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: Byte max = Byte.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(Byte)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { Byte valueNo1 = values[recordNo1]; Byte 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); // copied from Byte.CompareTo(Byte) } 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; } Byte valueNo1 = values[recordNo]; if ((defaultValue == valueNo1) && IsNull(recordNo)) { return -1; } return valueNo1.CompareTo((Byte)value); //return(valueNo1 - valueNo2); // copied from Byte.CompareTo(Byte) } public override object ConvertValue(object value) { if (NullValue != value) { if (null != value) { value = ((IConvertible)value).ToByte(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) { Byte value = values[record]; if (value != 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).ToByte(FormatProvider); SetNullBit(record, false); } } override public void SetCapacity(int capacity) { Byte[] newValues = new Byte[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.ToByte(s); } override public string ConvertObjectToXml(object value) { return XmlConvert.ToString((Byte) value); } override protected object GetEmptyStorage(int recordCount) { return new Byte[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { Byte[] typedStore = (Byte[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (Byte[]) store; SetNullStorage(nullbits); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// 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 ByteStorage : DataStorage { private const Byte defaultValue = 0; private Byte[] values; internal ByteStorage(DataColumn column) : base(column, typeof(Byte), 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 (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) { Byte mean; checked {mean = (Byte)(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: Byte min = Byte.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: Byte max = Byte.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(Byte)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { Byte valueNo1 = values[recordNo1]; Byte 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); // copied from Byte.CompareTo(Byte) } 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; } Byte valueNo1 = values[recordNo]; if ((defaultValue == valueNo1) && IsNull(recordNo)) { return -1; } return valueNo1.CompareTo((Byte)value); //return(valueNo1 - valueNo2); // copied from Byte.CompareTo(Byte) } public override object ConvertValue(object value) { if (NullValue != value) { if (null != value) { value = ((IConvertible)value).ToByte(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) { Byte value = values[record]; if (value != 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).ToByte(FormatProvider); SetNullBit(record, false); } } override public void SetCapacity(int capacity) { Byte[] newValues = new Byte[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.ToByte(s); } override public string ConvertObjectToXml(object value) { return XmlConvert.ToString((Byte) value); } override protected object GetEmptyStorage(int recordCount) { return new Byte[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { Byte[] typedStore = (Byte[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (Byte[]) store; SetNullStorage(nullbits); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- safex509handles.cs
- SoapCodeExporter.cs
- HostSecurityManager.cs
- MetabaseServerConfig.cs
- XmlObjectSerializerWriteContextComplexJson.cs
- StreamingContext.cs
- PositiveTimeSpanValidator.cs
- UriParserTemplates.cs
- ContainerSelectorActiveEvent.cs
- TypeUtil.cs
- MenuAdapter.cs
- KnownTypes.cs
- Propagator.JoinPropagator.cs
- XmlReaderSettings.cs
- ParseChildrenAsPropertiesAttribute.cs
- Parameter.cs
- QuotaThrottle.cs
- PropertyCondition.cs
- ReaderOutput.cs
- SchemaElementDecl.cs
- ActivationWorker.cs
- PropertyKey.cs
- PeerInvitationResponse.cs
- Trigger.cs
- ManualWorkflowSchedulerService.cs
- PtsCache.cs
- SessionSwitchEventArgs.cs
- ImageUrlEditor.cs
- JoinQueryOperator.cs
- QilReplaceVisitor.cs
- CodeMethodReturnStatement.cs
- SafeNativeMethods.cs
- UpDownBase.cs
- VisualTarget.cs
- InputProviderSite.cs
- ErrorRuntimeConfig.cs
- SqlBuilder.cs
- WindowsListViewItemStartMenu.cs
- FixUp.cs
- DescendantOverDescendantQuery.cs
- XmlAggregates.cs
- TextParagraphCache.cs
- HyperLinkDataBindingHandler.cs
- httpapplicationstate.cs
- StylusSystemGestureEventArgs.cs
- ConditionCollection.cs
- SimpleFieldTemplateUserControl.cs
- SplayTreeNode.cs
- OdbcParameterCollection.cs
- TextProperties.cs
- ResourceDescriptionAttribute.cs
- ProxyHwnd.cs
- XmlFormatWriterGenerator.cs
- ListBoxItem.cs
- ObjectParameterCollection.cs
- RMPermissions.cs
- NavigatorOutput.cs
- AnimationLayer.cs
- MessageSmuggler.cs
- TrustLevel.cs
- ErrorHandler.cs
- DuplicateWaitObjectException.cs
- ByteStreamGeometryContext.cs
- SchemaTypeEmitter.cs
- ToolStripContentPanel.cs
- MDIClient.cs
- Bold.cs
- ViewKeyConstraint.cs
- DownloadProgressEventArgs.cs
- TableParaClient.cs
- NamedObject.cs
- SqlNodeTypeOperators.cs
- AutomationPatternInfo.cs
- ConfigPathUtility.cs
- PeerPresenceInfo.cs
- TypeDescriptionProvider.cs
- MobileControlDesigner.cs
- updatecommandorderer.cs
- SecurityTokenAttachmentMode.cs
- UrlAuthorizationModule.cs
- Int32Rect.cs
- TypefaceMetricsCache.cs
- SystemWebSectionGroup.cs
- AnnotationMap.cs
- RenderCapability.cs
- QilScopedVisitor.cs
- SrgsElementList.cs
- ICspAsymmetricAlgorithm.cs
- Win32KeyboardDevice.cs
- HtmlInputSubmit.cs
- SchemaElementLookUpTableEnumerator.cs
- SimpleMailWebEventProvider.cs
- ReadOnlyHierarchicalDataSourceView.cs
- AnnotationComponentManager.cs
- ComEventsSink.cs
- UpdatePanelTriggerCollection.cs
- XmlParserContext.cs
- CacheRequest.cs
- OneWayBindingElement.cs
- graph.cs