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 / SingleStorage.cs / 1 / SingleStorage.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 SingleStorage : DataStorage { private const Single defaultValue = 0.0f; private Single[] values; public SingleStorage(DataColumn column) : base(column, typeof(Single), defaultValue) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: Single 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: Double meanSum = (Double)defaultValue; int meanCount = 0; foreach (int record in records) { if (IsNull(record)) continue; checked { meanSum += (Double)values[record];} meanCount++; hasData = true; } if (hasData) { Single mean; checked {mean = (Single)(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: Single min = Single.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: Single max = Single.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(Single)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { Single valueNo1 = values[recordNo1]; Single valueNo2 = values[recordNo2]; if (valueNo1 == defaultValue || valueNo2 == defaultValue) { int bitCheck = CompareBits(recordNo1, recordNo2); if (0 != bitCheck) return bitCheck; } return valueNo1.CompareTo(valueNo2); // not simple, checks Nan } 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; } Single valueNo1 = values[recordNo]; if ((defaultValue == valueNo1) && IsNull(recordNo)) { return -1; } return valueNo1.CompareTo((Single)value); } public override object ConvertValue(object value) { if (NullValue != value) { if (null != value) { value = ((IConvertible)value).ToSingle(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) { Single 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).ToSingle(FormatProvider); SetNullBit(record, false); } } override public void SetCapacity(int capacity) { Single[] newValues = new Single[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.ToSingle(s); } override public string ConvertObjectToXml(object value) { return XmlConvert.ToString((Single)value); } override protected object GetEmptyStorage(int recordCount) { return new Single[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { Single[] typedStore = (Single[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (Single[]) 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 SingleStorage : DataStorage { private const Single defaultValue = 0.0f; private Single[] values; public SingleStorage(DataColumn column) : base(column, typeof(Single), defaultValue) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: Single 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: Double meanSum = (Double)defaultValue; int meanCount = 0; foreach (int record in records) { if (IsNull(record)) continue; checked { meanSum += (Double)values[record];} meanCount++; hasData = true; } if (hasData) { Single mean; checked {mean = (Single)(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: Single min = Single.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: Single max = Single.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(Single)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { Single valueNo1 = values[recordNo1]; Single valueNo2 = values[recordNo2]; if (valueNo1 == defaultValue || valueNo2 == defaultValue) { int bitCheck = CompareBits(recordNo1, recordNo2); if (0 != bitCheck) return bitCheck; } return valueNo1.CompareTo(valueNo2); // not simple, checks Nan } 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; } Single valueNo1 = values[recordNo]; if ((defaultValue == valueNo1) && IsNull(recordNo)) { return -1; } return valueNo1.CompareTo((Single)value); } public override object ConvertValue(object value) { if (NullValue != value) { if (null != value) { value = ((IConvertible)value).ToSingle(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) { Single 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).ToSingle(FormatProvider); SetNullBit(record, false); } } override public void SetCapacity(int capacity) { Single[] newValues = new Single[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.ToSingle(s); } override public string ConvertObjectToXml(object value) { return XmlConvert.ToString((Single)value); } override protected object GetEmptyStorage(int recordCount) { return new Single[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { Single[] typedStore = (Single[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (Single[]) 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
- SignedInfo.cs
- GeometryCollection.cs
- BitmapEffect.cs
- Context.cs
- MediaElementAutomationPeer.cs
- SQLInt16Storage.cs
- XmlObjectSerializerWriteContext.cs
- EventHandlerList.cs
- TimeManager.cs
- DependentTransaction.cs
- DependencyPropertyHelper.cs
- NestPullup.cs
- NetStream.cs
- RealizedColumnsBlock.cs
- HtmlDocument.cs
- GridViewRowCollection.cs
- WindowsToolbarAsMenu.cs
- SafeProcessHandle.cs
- WmlFormAdapter.cs
- LicenseException.cs
- GeneralTransform2DTo3D.cs
- CheckPair.cs
- SiteMapSection.cs
- EditorPart.cs
- DataGridViewComboBoxColumn.cs
- StateRuntime.cs
- validationstate.cs
- BaseResourcesBuildProvider.cs
- JsonCollectionDataContract.cs
- DefaultTraceListener.cs
- WebReferenceCollection.cs
- CryptographicAttribute.cs
- StringWriter.cs
- SqlUtil.cs
- InvalidOperationException.cs
- StrokeSerializer.cs
- CustomAttributeSerializer.cs
- WebPartAddingEventArgs.cs
- DataKey.cs
- SatelliteContractVersionAttribute.cs
- DataConnectionHelper.cs
- PageThemeBuildProvider.cs
- SecondaryViewProvider.cs
- WSDualHttpSecurityMode.cs
- CultureMapper.cs
- SoapMessage.cs
- ListViewDeletedEventArgs.cs
- BinHexDecoder.cs
- Tool.cs
- SiteMapSection.cs
- HashRepartitionStream.cs
- DescendentsWalker.cs
- PrintPageEvent.cs
- UnsafeNativeMethodsCLR.cs
- DataSourceHelper.cs
- VisualStyleTypesAndProperties.cs
- HttpCacheParams.cs
- XmlSchemas.cs
- Profiler.cs
- PeerNameRecord.cs
- ResXFileRef.cs
- InputLangChangeRequestEvent.cs
- DragStartedEventArgs.cs
- SmiMetaData.cs
- ObjectDataSourceEventArgs.cs
- ButtonBaseAdapter.cs
- Utilities.cs
- TypeUtil.cs
- XmlIgnoreAttribute.cs
- WorkerRequest.cs
- UseLicense.cs
- InfoCardAsymmetricCrypto.cs
- DecimalAnimationBase.cs
- DropSource.cs
- TextFormatterContext.cs
- DefaultAuthorizationContext.cs
- UpnEndpointIdentityExtension.cs
- DataGridViewComboBoxCell.cs
- LogRecordSequence.cs
- FileEnumerator.cs
- HttpListenerRequest.cs
- RuntimeEnvironment.cs
- ExplicitDiscriminatorMap.cs
- XPathNodePointer.cs
- SelectedDatesCollection.cs
- FrameworkElementFactoryMarkupObject.cs
- HitTestFilterBehavior.cs
- TrustManagerPromptUI.cs
- InlinedAggregationOperatorEnumerator.cs
- SessionEndedEventArgs.cs
- AddInIpcChannel.cs
- IdleTimeoutMonitor.cs
- HttpModuleCollection.cs
- ColorTransformHelper.cs
- XsltException.cs
- OwnerDrawPropertyBag.cs
- Rect.cs
- FontCacheUtil.cs
- Delay.cs
- Vars.cs