Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Query / InternalTrees / ColumnMapCopier.cs / 1305376 / ColumnMapCopier.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Globalization; using System.Diagnostics; using System.Data.Query.InternalTrees; using System.Data.Query.PlanCompiler; using System.Linq; using System.Data.Mapping; using System.Data.Metadata.Edm; namespace System.Data.Query.InternalTrees { ////// The ColumnMapCopier clones an entire ColumnMap hierarchy; this is different /// than the ColumnMapTranslator, which only copies things that need to be copied. /// /// Note that this is a stateless visitor; it uses the visitor's argument for its /// state management. /// /// The Visitor's argument is a VarMap; anytime a Var is found in the ColumnMap /// hierarchy, it is replaced with the replacement from the VarMap. /// /// Note also that previous implementations of this class attempted to avoid re- /// processing ColumnMaps by caching the results for each input and returning it. /// I wasn't convinced that we were buying much with all that caching, since the /// only ColumnMaps that should be repeated in the hierarchy are simple ones; there /// is about as much object creation either way. The only reason I see that we /// want to cache these is if we really cared to have only one VarRefColumnMap /// instance for a given Var and be able to use reference equality instead of /// comparing the Vars themselves. I don't believe we're making that guarantee /// anywhere else, so I've removed that for now because I don't want the added /// complexity that the caching adds. If performance analysis indicates there is /// a problem, we can considier addding the cache back in. /// internal class ColumnMapCopier : ColumnMapVisitorWithResults{ #region Constructors /// /// Singleton instance for the "public" methods to use; /// static private ColumnMapCopier Instance = new ColumnMapCopier(); ////// Constructor; no one should use this. /// private ColumnMapCopier() { } #endregion #region "Public" surface area ////// Return a copy of the column map, replacing all vars with the replacements /// found in the replacementVarMap /// /// /// ///internal static ColumnMap Copy(ColumnMap columnMap, VarMap replacementVarMap) { return columnMap.Accept(Instance, replacementVarMap); } #endregion #region Visitor Helpers /// /// Returns the var to use in the copy, either the original or the /// replacement. Note that we will follow the chain of replacements, in /// case the replacement was also replaced. /// /// /// ///private static Var GetReplacementVar(Var originalVar, VarMap replacementVarMap) { // SQLBUDT #478509: Follow the chain of mapped vars, don't // just stop at the first one Var replacementVar = originalVar; while (replacementVarMap.TryGetValue(replacementVar, out originalVar)) { if (originalVar == replacementVar) { break; } replacementVar = originalVar; } return replacementVar; } #endregion #region Visitor Methods #region List handling /// /// Copies the List of ColumnMaps or SimpleColumnMaps /// ////// /// /// internal TListType[] VisitList (TListType[] tList, VarMap replacementVarMap) where TListType : ColumnMap { TListType[] newTList = new TListType[tList.Length]; for(int i = 0; i < tList.Length; ++i) { newTList[i] = (TListType)tList[i].Accept(this, replacementVarMap); } return newTList; } #endregion #region EntityIdentity handling /// /// Copies the DiscriminatedEntityIdentity /// /// /// ///protected override EntityIdentity VisitEntityIdentity(DiscriminatedEntityIdentity entityIdentity, VarMap replacementVarMap) { SimpleColumnMap newEntitySetCol = (SimpleColumnMap)entityIdentity.EntitySetColumnMap.Accept(this, replacementVarMap); SimpleColumnMap[] newKeys = VisitList(entityIdentity.Keys, replacementVarMap); return new DiscriminatedEntityIdentity(newEntitySetCol, entityIdentity.EntitySetMap, newKeys); } /// /// Copies the SimpleEntityIdentity /// /// /// ///protected override EntityIdentity VisitEntityIdentity(SimpleEntityIdentity entityIdentity, VarMap replacementVarMap) { SimpleColumnMap[] newKeys = VisitList(entityIdentity.Keys, replacementVarMap); return new SimpleEntityIdentity(entityIdentity.EntitySet, newKeys); } #endregion /// /// ComplexTypeColumnMap /// /// /// ///internal override ColumnMap Visit(ComplexTypeColumnMap columnMap, VarMap replacementVarMap) { SimpleColumnMap newNullability = columnMap.NullSentinel; if (null != newNullability) { newNullability = (SimpleColumnMap)newNullability.Accept(this, replacementVarMap); } ColumnMap[] fieldList = VisitList(columnMap.Properties, replacementVarMap); return new ComplexTypeColumnMap(columnMap.Type, columnMap.Name, fieldList, newNullability); } /// /// DiscriminatedCollectionColumnMap /// /// /// ///internal override ColumnMap Visit(DiscriminatedCollectionColumnMap columnMap, VarMap replacementVarMap) { ColumnMap newElementColumnMap = columnMap.Element.Accept(this, replacementVarMap); SimpleColumnMap newDiscriminator = (SimpleColumnMap)columnMap.Discriminator.Accept(this, replacementVarMap); SimpleColumnMap[] newKeys = VisitList(columnMap.Keys, replacementVarMap); SimpleColumnMap[] newForeignKeys = VisitList(columnMap.ForeignKeys, replacementVarMap); return new DiscriminatedCollectionColumnMap(columnMap.Type, columnMap.Name, newElementColumnMap, newKeys, newForeignKeys, newDiscriminator, columnMap.DiscriminatorValue); } /// /// EntityColumnMap /// /// /// ///internal override ColumnMap Visit(EntityColumnMap columnMap, VarMap replacementVarMap) { EntityIdentity newEntityIdentity = VisitEntityIdentity(columnMap.EntityIdentity, replacementVarMap); ColumnMap[] fieldList = VisitList(columnMap.Properties, replacementVarMap); return new EntityColumnMap(columnMap.Type, columnMap.Name, fieldList, newEntityIdentity); } /// /// SimplePolymorphicColumnMap /// /// /// ///internal override ColumnMap Visit(SimplePolymorphicColumnMap columnMap, VarMap replacementVarMap) { SimpleColumnMap newDiscriminator = (SimpleColumnMap)columnMap.TypeDiscriminator.Accept(this, replacementVarMap); Dictionary
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