Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DLinq / Dlinq / SqlClient / Query / SqlColumnizer.cs / 1 / SqlColumnizer.cs
using System; using System.Collections.Generic; using System.Linq.Expressions; using System.Reflection; using System.Data.Linq; using System.Data.Linq.Mapping; using System.Data.Linq.Provider; using System.Linq; using System.Data.Linq.SqlClient; using System.Diagnostics.CodeAnalysis; namespace System.Data.Linq.SqlClient { // partions select expressions and common subexpressions into scalar and non-scalar pieces by // wrapping scalar pieces floating column nodes. internal class SqlColumnizer { ColumnNominator nominator; ColumnDeclarer declarer; internal SqlColumnizer(FuncfnCanBeColumn) { this.nominator = new ColumnNominator(fnCanBeColumn); this.declarer = new ColumnDeclarer(); } internal SqlExpression ColumnizeSelection(SqlExpression selection) { return this.declarer.Declare(selection, this.nominator.Nominate(selection)); } class ColumnDeclarer : SqlVisitor { HashSet candidates; internal ColumnDeclarer() { } internal SqlExpression Declare(SqlExpression expression, HashSet candidates) { this.candidates = candidates; return (SqlExpression)this.Visit(expression); } internal override SqlNode Visit(SqlNode node) { SqlExpression expr = node as SqlExpression; if (expr != null) { if (this.candidates.Contains(expr)) { if (expr.NodeType == SqlNodeType.Column || expr.NodeType == SqlNodeType.ColumnRef) { return expr; } else { return new SqlColumn(expr.ClrType, expr.SqlType, null, null, expr, expr.SourceExpression); } } } return base.Visit(node); } } class ColumnNominator : SqlVisitor { bool isBlocked; HashSet candidates; Func fnCanBeColumn; internal ColumnNominator(Func fnCanBeColumn) { this.fnCanBeColumn = fnCanBeColumn; } internal HashSet Nominate(SqlExpression expression) { this.candidates = new HashSet (); this.isBlocked = false; this.Visit(expression); return this.candidates; } internal override SqlNode Visit(SqlNode node) { SqlExpression expression = node as SqlExpression; if (expression != null) { bool saveIsBlocked = this.isBlocked; this.isBlocked = false; if (CanRecurseColumnize(expression)) { base.Visit(expression); } if (!this.isBlocked) { if (!IsClientOnly(expression) && expression.NodeType != SqlNodeType.Column && expression.SqlType.CanBeColumn && (this.fnCanBeColumn == null || this.fnCanBeColumn(expression)) ) { this.candidates.Add(expression); } else { this.isBlocked = true; } } this.isBlocked |= saveIsBlocked; } return node; } internal override SqlExpression VisitSimpleCase(SqlSimpleCase c) { c.Expression = this.VisitExpression(c.Expression); for (int i = 0, n = c.Whens.Count; i < n; i++) { // Don't walk down the match side. This can't be a column. c.Whens[i].Value = this.VisitExpression(c.Whens[i].Value); } return c; } internal override SqlExpression VisitTypeCase(SqlTypeCase tc) { tc.Discriminator = this.VisitExpression(tc.Discriminator); for (int i = 0, n = tc.Whens.Count; i < n; i++) { // Don't walk down the match side. This can't be a column. tc.Whens[i].TypeBinding = this.VisitExpression(tc.Whens[i].TypeBinding); } return tc; } internal override SqlExpression VisitClientCase(SqlClientCase c) { c.Expression = this.VisitExpression(c.Expression); for (int i = 0, n = c.Whens.Count; i < n; i++) { // Don't walk down the match side. This can't be a column. c.Whens[i].Value = this.VisitExpression(c.Whens[i].Value); } return c; } private static bool CanRecurseColumnize(SqlExpression expr) { switch (expr.NodeType) { case SqlNodeType.AliasRef: case SqlNodeType.ColumnRef: case SqlNodeType.Column: case SqlNodeType.Multiset: case SqlNodeType.Element: case SqlNodeType.ScalarSubSelect: case SqlNodeType.Exists: case SqlNodeType.ClientQuery: case SqlNodeType.SharedExpressionRef: case SqlNodeType.Link: case SqlNodeType.Nop: case SqlNodeType.Value: case SqlNodeType.Select: return false; default: return true; } } [SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification="These issues are related to our use of if-then and case statements for node types, which adds to the complexity count however when reviewed they are easy to navigate and understand.")] private static bool IsClientOnly(SqlExpression expr) { switch (expr.NodeType) { case SqlNodeType.ClientCase: case SqlNodeType.TypeCase: case SqlNodeType.ClientArray: case SqlNodeType.Grouping: case SqlNodeType.DiscriminatedType: case SqlNodeType.SharedExpression: case SqlNodeType.SimpleExpression: case SqlNodeType.AliasRef: case SqlNodeType.Multiset: case SqlNodeType.Element: case SqlNodeType.ClientQuery: case SqlNodeType.SharedExpressionRef: case SqlNodeType.Link: case SqlNodeType.Nop: return true; case SqlNodeType.OuterJoinedValue: return IsClientOnly(((SqlUnary)expr).Operand); default: return false; } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System; using System.Collections.Generic; using System.Linq.Expressions; using System.Reflection; using System.Data.Linq; using System.Data.Linq.Mapping; using System.Data.Linq.Provider; using System.Linq; using System.Data.Linq.SqlClient; using System.Diagnostics.CodeAnalysis; namespace System.Data.Linq.SqlClient { // partions select expressions and common subexpressions into scalar and non-scalar pieces by // wrapping scalar pieces floating column nodes. internal class SqlColumnizer { ColumnNominator nominator; ColumnDeclarer declarer; internal SqlColumnizer(Func fnCanBeColumn) { this.nominator = new ColumnNominator(fnCanBeColumn); this.declarer = new ColumnDeclarer(); } internal SqlExpression ColumnizeSelection(SqlExpression selection) { return this.declarer.Declare(selection, this.nominator.Nominate(selection)); } class ColumnDeclarer : SqlVisitor { HashSet candidates; internal ColumnDeclarer() { } internal SqlExpression Declare(SqlExpression expression, HashSet candidates) { this.candidates = candidates; return (SqlExpression)this.Visit(expression); } internal override SqlNode Visit(SqlNode node) { SqlExpression expr = node as SqlExpression; if (expr != null) { if (this.candidates.Contains(expr)) { if (expr.NodeType == SqlNodeType.Column || expr.NodeType == SqlNodeType.ColumnRef) { return expr; } else { return new SqlColumn(expr.ClrType, expr.SqlType, null, null, expr, expr.SourceExpression); } } } return base.Visit(node); } } class ColumnNominator : SqlVisitor { bool isBlocked; HashSet candidates; Func fnCanBeColumn; internal ColumnNominator(Func fnCanBeColumn) { this.fnCanBeColumn = fnCanBeColumn; } internal HashSet Nominate(SqlExpression expression) { this.candidates = new HashSet (); this.isBlocked = false; this.Visit(expression); return this.candidates; } internal override SqlNode Visit(SqlNode node) { SqlExpression expression = node as SqlExpression; if (expression != null) { bool saveIsBlocked = this.isBlocked; this.isBlocked = false; if (CanRecurseColumnize(expression)) { base.Visit(expression); } if (!this.isBlocked) { if (!IsClientOnly(expression) && expression.NodeType != SqlNodeType.Column && expression.SqlType.CanBeColumn && (this.fnCanBeColumn == null || this.fnCanBeColumn(expression)) ) { this.candidates.Add(expression); } else { this.isBlocked = true; } } this.isBlocked |= saveIsBlocked; } return node; } internal override SqlExpression VisitSimpleCase(SqlSimpleCase c) { c.Expression = this.VisitExpression(c.Expression); for (int i = 0, n = c.Whens.Count; i < n; i++) { // Don't walk down the match side. This can't be a column. c.Whens[i].Value = this.VisitExpression(c.Whens[i].Value); } return c; } internal override SqlExpression VisitTypeCase(SqlTypeCase tc) { tc.Discriminator = this.VisitExpression(tc.Discriminator); for (int i = 0, n = tc.Whens.Count; i < n; i++) { // Don't walk down the match side. This can't be a column. tc.Whens[i].TypeBinding = this.VisitExpression(tc.Whens[i].TypeBinding); } return tc; } internal override SqlExpression VisitClientCase(SqlClientCase c) { c.Expression = this.VisitExpression(c.Expression); for (int i = 0, n = c.Whens.Count; i < n; i++) { // Don't walk down the match side. This can't be a column. c.Whens[i].Value = this.VisitExpression(c.Whens[i].Value); } return c; } private static bool CanRecurseColumnize(SqlExpression expr) { switch (expr.NodeType) { case SqlNodeType.AliasRef: case SqlNodeType.ColumnRef: case SqlNodeType.Column: case SqlNodeType.Multiset: case SqlNodeType.Element: case SqlNodeType.ScalarSubSelect: case SqlNodeType.Exists: case SqlNodeType.ClientQuery: case SqlNodeType.SharedExpressionRef: case SqlNodeType.Link: case SqlNodeType.Nop: case SqlNodeType.Value: case SqlNodeType.Select: return false; default: return true; } } [SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification="These issues are related to our use of if-then and case statements for node types, which adds to the complexity count however when reviewed they are easy to navigate and understand.")] private static bool IsClientOnly(SqlExpression expr) { switch (expr.NodeType) { case SqlNodeType.ClientCase: case SqlNodeType.TypeCase: case SqlNodeType.ClientArray: case SqlNodeType.Grouping: case SqlNodeType.DiscriminatedType: case SqlNodeType.SharedExpression: case SqlNodeType.SimpleExpression: case SqlNodeType.AliasRef: case SqlNodeType.Multiset: case SqlNodeType.Element: case SqlNodeType.ClientQuery: case SqlNodeType.SharedExpressionRef: case SqlNodeType.Link: case SqlNodeType.Nop: return true; case SqlNodeType.OuterJoinedValue: return IsClientOnly(((SqlUnary)expr).Operand); default: return false; } } } } } // 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
- JsonReader.cs
- ContextBase.cs
- LZCodec.cs
- MemoryPressure.cs
- XhtmlConformanceSection.cs
- TreePrinter.cs
- WebPartConnectionsConnectVerb.cs
- FontNameConverter.cs
- IgnoreSectionHandler.cs
- XmlILTrace.cs
- UnhandledExceptionEventArgs.cs
- DataRelation.cs
- RemotingClientProxy.cs
- SharedStatics.cs
- KnownBoxes.cs
- ListControl.cs
- SequentialWorkflowHeaderFooter.cs
- RecipientInfo.cs
- UserControl.cs
- DoubleAnimationClockResource.cs
- PeerNameRecordCollection.cs
- WebPartAuthorizationEventArgs.cs
- x509utils.cs
- GeometryValueSerializer.cs
- StateWorkerRequest.cs
- CacheManager.cs
- TaskHelper.cs
- DynamicField.cs
- SoapExtensionStream.cs
- TableAdapterManagerGenerator.cs
- XmlSerializerSection.cs
- ClipboardData.cs
- _LazyAsyncResult.cs
- CertificateManager.cs
- ResourceWriter.cs
- UIElementCollection.cs
- MouseDevice.cs
- PrintControllerWithStatusDialog.cs
- ApplicationSettingsBase.cs
- _NtlmClient.cs
- CodeDefaultValueExpression.cs
- BinaryEditor.cs
- IncrementalReadDecoders.cs
- SQLConvert.cs
- TableCell.cs
- ResetableIterator.cs
- SqlReferenceCollection.cs
- DataSourceView.cs
- RequestCachingSection.cs
- SettingsPropertyCollection.cs
- Context.cs
- DeadCharTextComposition.cs
- Matrix3DValueSerializer.cs
- XmlConvert.cs
- AttachedAnnotation.cs
- SqlCrossApplyToCrossJoin.cs
- IsolationInterop.cs
- SchemaImporterExtension.cs
- OutputScope.cs
- BitmapEffectRenderDataResource.cs
- XamlStream.cs
- ClientTarget.cs
- xsdvalidator.cs
- PnrpPeerResolver.cs
- AuthorizationContext.cs
- IssuedSecurityTokenParameters.cs
- FontDialog.cs
- SqlPersonalizationProvider.cs
- MultipleViewPatternIdentifiers.cs
- Typography.cs
- StrokeNodeOperations2.cs
- TextContainerChangedEventArgs.cs
- TdsParserStaticMethods.cs
- CheckBoxStandardAdapter.cs
- DesignerCategoryAttribute.cs
- PreservationFileReader.cs
- PageBuildProvider.cs
- MessageAction.cs
- InteropBitmapSource.cs
- LinearKeyFrames.cs
- ListView.cs
- Msmq4SubqueuePoisonHandler.cs
- Socket.cs
- HtmlAnchor.cs
- NameTable.cs
- StringPropertyBuilder.cs
- IsolatedStorageFileStream.cs
- XmlAttribute.cs
- XmlSchemaComplexType.cs
- ActivityDesigner.cs
- DataTrigger.cs
- Command.cs
- ProcessProtocolHandler.cs
- UnsignedPublishLicense.cs
- CalendarDateRange.cs
- SqlDataSourceView.cs
- WindowsGraphicsWrapper.cs
- XmlHierarchicalEnumerable.cs
- SortQueryOperator.cs
- ColumnWidthChangedEvent.cs