Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Query / PlanCompiler / CodeGen.cs / 1305376 / CodeGen.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; //using System.Diagnostics; // Please use PlanCompiler.Assert instead of Debug.Assert in this class... using System.Globalization; using md = System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; using System.Data.Query.InternalTrees; using System.Data.Query.PlanCompiler; // // The CodeGen module is responsible for translating the ITree finally into a query // We assume that various tree transformations have taken place, and the tree // is finally ready to be executed. The CodeGen module // * converts the Itree into one or more CTrees (in S space) // * produces a ColumnMap to facilitate result assembly // * and wraps up everything in a plan object // // namespace System.Data.Query.PlanCompiler { internal class CodeGen { #region public methods ////// This involves /// * Converting the ITree into a set of ProviderCommandInfo objects /// * Creating a column map to enable result assembly /// Currently, we only produce a single ITree, and correspondingly, the /// following steps are trivial /// /// current compiler state /// CQTs for each store command /// column map to help in result assembly internal static void Process(PlanCompiler compilerState, out ListchildCommands, out ColumnMap resultColumnMap, out int columnCount) { CodeGen codeGen = new CodeGen(compilerState); codeGen.Process(out childCommands, out resultColumnMap, out columnCount); } #endregion #region constructors private CodeGen(PlanCompiler compilerState) { m_compilerState = compilerState; } #endregion #region private methods /// /// The real driver. This routine walks the tree, converts each subcommand /// into a CTree, and converts the columnmap into a real column map. /// Finally, it produces a "real" plan that can be used by the bridge execution, and /// returns this plan /// /// The root of the tree must be a PhysicalProjectOp. Each child of this Op /// represents a command to be executed, and the ColumnMap of this Op represents /// the eventual columnMap to be used for result assembly /// /// CQTs for store commands /// column map for result assembly private void Process(out ListchildCommands, out ColumnMap resultColumnMap, out int columnCount) { PhysicalProjectOp projectOp = (PhysicalProjectOp)this.Command.Root.Op; this.m_subCommands = new List (new Node[] { this.Command.Root }); childCommands = new List (new ProviderCommandInfo[] { ProviderCommandInfoUtils.Create( this.Command, this.Command.Root // input node )}); // Build the final column map, and count the columns we expect for it. resultColumnMap = BuildResultColumnMap(projectOp); columnCount = projectOp.Outputs.Count; } private ColumnMap BuildResultColumnMap(PhysicalProjectOp projectOp) { // convert the column map into a real column map // build up a dictionary mapping Vars to their real positions in the commands Dictionary> varMap = BuildVarMap(); ColumnMap realColumnMap = ColumnMapTranslator.Translate(projectOp.ColumnMap, varMap); return realColumnMap; } /// /// For each subcommand, build up a "location-map" for each top-level var that /// is projected out. This location map will ultimately be used to convert VarRefColumnMap /// into SimpleColumnMap /// private Dictionary> BuildVarMap() { Dictionary> varMap = new Dictionary>(); int commandId = 0; foreach (Node subCommand in m_subCommands) { PhysicalProjectOp projectOp = (PhysicalProjectOp)subCommand.Op; int columnPos = 0; foreach (Var v in projectOp.Outputs) { KeyValuePairvarLocation = new KeyValuePair (commandId, columnPos); varMap[v] = varLocation; columnPos++; } commandId++; } return varMap; } #endregion #region private state private PlanCompiler m_compilerState; private Command Command { get { return m_compilerState.Command; } } private List m_subCommands; #endregion } } // 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
- DataGridPreparingCellForEditEventArgs.cs
- DiscreteKeyFrames.cs
- InputGestureCollection.cs
- MouseEvent.cs
- DashStyle.cs
- ListViewGroupCollectionEditor.cs
- PagesChangedEventArgs.cs
- XmlNullResolver.cs
- NetStream.cs
- FontInfo.cs
- HighlightVisual.cs
- DataService.cs
- CommandExpr.cs
- HyperLinkDesigner.cs
- followingsibling.cs
- Sentence.cs
- DeclaredTypeElementCollection.cs
- SplineKeyFrames.cs
- PolyLineSegment.cs
- WinFormsComponentEditor.cs
- IndentTextWriter.cs
- RectAnimationBase.cs
- CodeGenerator.cs
- FixedPosition.cs
- DashStyle.cs
- AnnotationComponentManager.cs
- View.cs
- UnsafeNativeMethods.cs
- XmlCodeExporter.cs
- ServerValidateEventArgs.cs
- CompositeActivityValidator.cs
- CloudCollection.cs
- FrameworkContentElement.cs
- SymbolEqualComparer.cs
- QueryOutputWriter.cs
- VisualStyleTypesAndProperties.cs
- FormatVersion.cs
- OperatingSystem.cs
- SimpleType.cs
- RectAnimationBase.cs
- FormatSettings.cs
- SHA256.cs
- OleDbFactory.cs
- AbsoluteQuery.cs
- ToolStripItemImageRenderEventArgs.cs
- PriorityItem.cs
- MsmqIntegrationSecurityMode.cs
- DefaultPrintController.cs
- ReadOnlyDataSource.cs
- ShutDownListener.cs
- EventRouteFactory.cs
- InkCollectionBehavior.cs
- ExtractedStateEntry.cs
- XamlBuildTaskServices.cs
- FontSizeConverter.cs
- VerificationAttribute.cs
- CookieHandler.cs
- XmlCharCheckingWriter.cs
- XmlSchemaSimpleContentExtension.cs
- Suspend.cs
- RegexCharClass.cs
- SmiEventSink_DeferedProcessing.cs
- oledbmetadatacolumnnames.cs
- SQLInt16.cs
- SymmetricKey.cs
- QueryAccessibilityHelpEvent.cs
- entityreference_tresulttype.cs
- WmpBitmapEncoder.cs
- ImportContext.cs
- GetCertificateRequest.cs
- AutomationPeer.cs
- ListSourceHelper.cs
- RecognitionEventArgs.cs
- TableLayoutRowStyleCollection.cs
- assertwrapper.cs
- CodeIdentifiers.cs
- OleDbInfoMessageEvent.cs
- _ProxyChain.cs
- Brush.cs
- SourceLineInfo.cs
- TitleStyle.cs
- DataPager.cs
- TextTreeUndoUnit.cs
- AgileSafeNativeMemoryHandle.cs
- StreamResourceInfo.cs
- FormParameter.cs
- Crypto.cs
- TableStyle.cs
- CompositeFontInfo.cs
- TextEncodedRawTextWriter.cs
- DesignTimeHTMLTextWriter.cs
- ListViewAutomationPeer.cs
- ConfigXmlCDataSection.cs
- RadioButton.cs
- BasicCellRelation.cs
- VariantWrapper.cs
- MessageAction.cs
- ListItem.cs
- ObjectQuery_EntitySqlExtensions.cs
- QuaternionIndependentAnimationStorage.cs