Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Filter / UnaryNode.cs / 1 / UnaryNode.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data { using System; using System.Collections.Generic; using System.Diagnostics; using System.Data.Common; using System.Data.SqlTypes; internal sealed class UnaryNode : ExpressionNode { internal readonly int op; internal ExpressionNode right; internal UnaryNode(DataTable table, int op, ExpressionNode right) : base(table) { this.op = op; this.right = right; } internal override void Bind(DataTable table, Listlist) { BindTable(table); right.Bind(table, list); } internal override object Eval() { return Eval(null, DataRowVersion.Default); } internal override object Eval(DataRow row, DataRowVersion version) { return EvalUnaryOp(op, right.Eval(row, version)); } internal override object Eval(int[] recordNos) { return right.Eval(recordNos); } private object EvalUnaryOp(int op, object vl) { object value = DBNull.Value; if (DataExpression.IsUnknown(vl)) return DBNull.Value; StorageType storageType; switch (op) { case Operators.Noop: return vl; case Operators.UnaryPlus: storageType = DataStorage.GetStorageType(vl.GetType()); if (ExpressionNode.IsNumericSql(storageType)) { return vl; } throw ExprException.TypeMismatch(this.ToString()); case Operators.Negative: // the have to be better way for doing this.. storageType = DataStorage.GetStorageType(vl.GetType()); if (ExpressionNode.IsNumericSql(storageType)) { switch(storageType) { case StorageType.Byte: value = -(Byte) vl; break; case StorageType.Int16: value = -(Int16) vl; break; case StorageType.Int32: value = -(Int32) vl; break; case StorageType.Int64: value = -(Int64) vl; break; case StorageType.Single: value = -(Single) vl; break; case StorageType.Double: value = -(Double) vl; break; case StorageType.Decimal: value = -(Decimal) vl; break; case StorageType.SqlDecimal: value = -(SqlDecimal) vl; break; case StorageType.SqlDouble: value = -(SqlDouble) vl; break; case StorageType.SqlSingle: value = -(SqlSingle) vl; break; case StorageType.SqlMoney: value = -(SqlMoney) vl; break; case StorageType.SqlInt64: value = -(SqlInt64) vl; break; case StorageType.SqlInt32: value = -(SqlInt32) vl; break; case StorageType.SqlInt16: value = -(SqlInt16) vl; break; default: Debug.Assert(false, "Missing a type conversion"); value = DBNull.Value; break; } return value; } throw ExprException.TypeMismatch(this.ToString()); case Operators.Not: if (vl is SqlBoolean){ if (((SqlBoolean)vl).IsFalse){ return SqlBoolean.True; } else if (((SqlBoolean)vl).IsTrue) { return SqlBoolean.False; } throw ExprException.UnsupportedOperator(op); // or should the result of not SQLNull be SqlNull ? } else{ if (DataExpression.ToBoolean(vl) != false) return false; return true; } default: throw ExprException.UnsupportedOperator(op); } } internal override bool IsConstant() { return(right.IsConstant()); } internal override bool IsTableConstant() { return(right.IsTableConstant()); } internal override bool HasLocalAggregate() { return(right.HasLocalAggregate()); } internal override bool HasRemoteAggregate() { return(right.HasRemoteAggregate()); } internal override bool DependsOn(DataColumn column) { return(right.DependsOn(column)); } internal override ExpressionNode Optimize() { right = right.Optimize(); if (this.IsConstant()) { object val = this.Eval(); return new ConstNode(table, ValueType.Object, val, false); } else return this; } } } // 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
- SqlDataSourceSelectingEventArgs.cs
- ConfigXmlCDataSection.cs
- SystemTcpStatistics.cs
- Error.cs
- IdleTimeoutMonitor.cs
- ConsoleCancelEventArgs.cs
- SmtpSection.cs
- shaperfactory.cs
- SqlHelper.cs
- XPathNavigatorReader.cs
- ExtensionDataReader.cs
- StringUtil.cs
- XmlLanguage.cs
- PathNode.cs
- EventDriven.cs
- TCPClient.cs
- XmlSiteMapProvider.cs
- EventRouteFactory.cs
- SEHException.cs
- SqlLiftWhereClauses.cs
- Mapping.cs
- StrokeNodeOperations2.cs
- MouseBinding.cs
- TextElementCollectionHelper.cs
- DesignerActionKeyboardBehavior.cs
- DirectoryObjectSecurity.cs
- Rule.cs
- PersistChildrenAttribute.cs
- BitmapMetadata.cs
- DropDownButton.cs
- SafeRightsManagementSessionHandle.cs
- QilReplaceVisitor.cs
- PackageProperties.cs
- MetadataCacheItem.cs
- HttpBufferlessInputStream.cs
- DbConnectionHelper.cs
- CircleHotSpot.cs
- DbConnectionPoolGroupProviderInfo.cs
- TriggerActionCollection.cs
- ResourceSet.cs
- ContainerFilterService.cs
- TypeDescriptionProvider.cs
- __ComObject.cs
- __Filters.cs
- Splitter.cs
- FullTextBreakpoint.cs
- SystemColorTracker.cs
- glyphs.cs
- BinaryKeyIdentifierClause.cs
- CreateUserWizardStep.cs
- MetabaseSettingsIis7.cs
- StructuralObject.cs
- AllMembershipCondition.cs
- ImmutableCollection.cs
- WebServiceData.cs
- LogLogRecord.cs
- EtwTrace.cs
- NodeLabelEditEvent.cs
- TrackingStringDictionary.cs
- SmiEventSink_Default.cs
- PointIndependentAnimationStorage.cs
- ZoneButton.cs
- QueryCacheEntry.cs
- UrlPropertyAttribute.cs
- CngUIPolicy.cs
- TableLayoutPanelCellPosition.cs
- OutputScope.cs
- PrintEvent.cs
- SafeSecurityHandles.cs
- BoundField.cs
- NetworkCredential.cs
- ProofTokenCryptoHandle.cs
- DataGridViewColumnDesignTimeVisibleAttribute.cs
- BrowserCapabilitiesCompiler.cs
- DateTimeAutomationPeer.cs
- TextParagraphView.cs
- NameValuePair.cs
- SchemeSettingElementCollection.cs
- SymbolType.cs
- AdjustableArrowCap.cs
- ResetableIterator.cs
- TypeToken.cs
- SystemNetworkInterface.cs
- GeneralTransform2DTo3D.cs
- UnionCqlBlock.cs
- ByteBufferPool.cs
- GridViewItemAutomationPeer.cs
- XmlNodeComparer.cs
- OdbcDataReader.cs
- KnownTypes.cs
- QuotedPrintableStream.cs
- PreDigestedSignedInfo.cs
- FormViewRow.cs
- Assert.cs
- EntityDataSource.cs
- SID.cs
- WindowsGraphicsWrapper.cs
- CopyAction.cs
- RegexRunnerFactory.cs
- SystemInfo.cs