Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / 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
- RSAPKCS1KeyExchangeDeformatter.cs
- SignalGate.cs
- SimpleBitVector32.cs
- StringValueSerializer.cs
- CodeDirectionExpression.cs
- EllipseGeometry.cs
- DataGridBoolColumn.cs
- XmlMemberMapping.cs
- GraphicsState.cs
- WebPartDisplayModeEventArgs.cs
- PageRouteHandler.cs
- ValidationErrorCollection.cs
- ExtendedPropertyDescriptor.cs
- KeyConstraint.cs
- DataGridViewCellStyleEditor.cs
- WinEventQueueItem.cs
- DispatcherSynchronizationContext.cs
- RectangleHotSpot.cs
- DataMisalignedException.cs
- TokenizerHelper.cs
- ToolZone.cs
- XmlChildNodes.cs
- OrderedDictionary.cs
- Int64AnimationUsingKeyFrames.cs
- WebPartDisplayModeEventArgs.cs
- QilXmlReader.cs
- BypassElement.cs
- XmlName.cs
- XPathDocumentBuilder.cs
- SymDocumentType.cs
- HotSpotCollection.cs
- SmiEventSink_DeferedProcessing.cs
- ValueUnavailableException.cs
- RuleInfoComparer.cs
- ClientSettings.cs
- EventData.cs
- MetadataPropertyvalue.cs
- PageEventArgs.cs
- TaiwanCalendar.cs
- SiteMap.cs
- LocalizationComments.cs
- DateTimeFormatInfoScanner.cs
- ObjectListFieldsPage.cs
- EdmFunctionAttribute.cs
- HtmlElement.cs
- PerfProviderCollection.cs
- SafeNativeMethodsMilCoreApi.cs
- PageContent.cs
- DragStartedEventArgs.cs
- EventRouteFactory.cs
- WebPartDisplayMode.cs
- EventLogEntryCollection.cs
- Buffer.cs
- WorkflowInstanceExtensionProvider.cs
- RuntimeCompatibilityAttribute.cs
- WebColorConverter.cs
- HostingEnvironment.cs
- SafeNativeMethods.cs
- DependencyProperty.cs
- CompositeScriptReference.cs
- SurrogateEncoder.cs
- InternalControlCollection.cs
- SQLInt16Storage.cs
- ReflectionUtil.cs
- ExpressionBindingsDialog.cs
- Baml2006SchemaContext.cs
- KeyGesture.cs
- HyperLinkStyle.cs
- _SSPIWrapper.cs
- RadioButtonFlatAdapter.cs
- RTLAwareMessageBox.cs
- SelectingProviderEventArgs.cs
- Vector3DAnimationBase.cs
- SafeRegistryKey.cs
- PointAnimationBase.cs
- MethodBuilder.cs
- ListItemViewControl.cs
- X500Name.cs
- ArrayWithOffset.cs
- COAUTHINFO.cs
- DataGridState.cs
- TopClause.cs
- DataGridDefaultColumnWidthTypeConverter.cs
- ClientEventManager.cs
- HuffmanTree.cs
- InternalControlCollection.cs
- ListViewTableRow.cs
- StringOutput.cs
- SamlAdvice.cs
- XsdDateTime.cs
- ButtonBaseAdapter.cs
- OdbcException.cs
- ResourceKey.cs
- SafeProcessHandle.cs
- Typography.cs
- Speller.cs
- XmlSchemas.cs
- StylusPoint.cs
- HttpAsyncResult.cs
- SecurityTokenRequirement.cs