Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / 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
- FormParameter.cs
- IIS7UserPrincipal.cs
- RelationshipEntry.cs
- ExclusiveHandleList.cs
- TableParaClient.cs
- TableHeaderCell.cs
- AQNBuilder.cs
- HasCopySemanticsAttribute.cs
- sortedlist.cs
- UInt32Storage.cs
- Stream.cs
- AnonymousIdentificationSection.cs
- HtmlInputText.cs
- ConvertBinder.cs
- isolationinterop.cs
- XmlIgnoreAttribute.cs
- InputReport.cs
- StateMachineAction.cs
- RepeaterItemCollection.cs
- ElementNotAvailableException.cs
- SystemIPInterfaceProperties.cs
- DbParameterCollectionHelper.cs
- BaseInfoTable.cs
- ConnectionStringsExpressionBuilder.cs
- ScriptResourceInfo.cs
- PlatformNotSupportedException.cs
- OrderPreservingPipeliningMergeHelper.cs
- GridViewCancelEditEventArgs.cs
- PrintControllerWithStatusDialog.cs
- SplayTreeNode.cs
- RelationshipManager.cs
- Registry.cs
- ArraySegment.cs
- XmlIncludeAttribute.cs
- TextBoxAutomationPeer.cs
- Input.cs
- CodeCommentStatementCollection.cs
- LayoutInformation.cs
- PrintController.cs
- KoreanCalendar.cs
- ContentHostHelper.cs
- CodeAccessPermission.cs
- TypeViewSchema.cs
- _UriSyntax.cs
- DbTransaction.cs
- StreamReader.cs
- InfiniteTimeSpanConverter.cs
- ISessionStateStore.cs
- Errors.cs
- WebPartDisplayModeCancelEventArgs.cs
- WindowsAuthenticationModule.cs
- LineServicesCallbacks.cs
- ImportOptions.cs
- UnsafeNativeMethodsPenimc.cs
- AddInSegmentDirectoryNotFoundException.cs
- SetIterators.cs
- PropertyGeneratedEventArgs.cs
- HostedElements.cs
- DefaultMemberAttribute.cs
- StatusBarPanelClickEvent.cs
- PackageFilter.cs
- OleDbInfoMessageEvent.cs
- CategoryState.cs
- CallContext.cs
- TrackBarRenderer.cs
- Pair.cs
- SoapServerMessage.cs
- ElementNotEnabledException.cs
- KeySplineConverter.cs
- TemplateContentLoader.cs
- HttpProfileBase.cs
- MemberNameValidator.cs
- HostingEnvironmentException.cs
- odbcmetadatacollectionnames.cs
- CallbackValidator.cs
- PreProcessInputEventArgs.cs
- TdsParameterSetter.cs
- PartManifestEntry.cs
- WSSecureConversationFeb2005.cs
- ExpressionNormalizer.cs
- WorkflowQueue.cs
- coordinator.cs
- GlobalItem.cs
- ToolStripButton.cs
- Globals.cs
- CompilationSection.cs
- SqlUDTStorage.cs
- NoPersistScope.cs
- Pkcs7Recipient.cs
- EventDrivenDesigner.cs
- ListenDesigner.cs
- ConfigurationHandlersInstallComponent.cs
- DataGridViewColumnHeaderCell.cs
- ButtonBase.cs
- ZipIOCentralDirectoryBlock.cs
- TypeListConverter.cs
- MessageSecurityException.cs
- PointCollectionValueSerializer.cs
- DataServiceSaveChangesEventArgs.cs
- ThreadExceptionEvent.cs