Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Query / PlanCompiler / VarRemapper.cs / 1305376 / VarRemapper.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.Data.Query.InternalTrees; namespace System.Data.Query.PlanCompiler { ////// The VarRemapper is a utility class that can be used to "remap" Var references /// in a node, or a subtree. /// internal class VarRemapper : BasicOpVisitor { #region Private state private readonly Dictionary m_varMap; protected readonly Command m_command; #endregion #region Constructors ////// Internal constructor /// /// Current iqt command internal VarRemapper(Command command) :this(command, new Dictionary()) { } ////// Internal constructor /// /// Current iqt command /// Var map to be used internal VarRemapper(Command command, Dictionary varMap) { m_command = command; m_varMap = varMap; } #endregion #region Public surface ////// Add a mapping for "oldVar" - when the replace methods are invoked, they /// will replace all references to "oldVar" by "newVar" /// /// var to replace /// the replacement var internal void AddMapping(Var oldVar, Var newVar) { m_varMap[oldVar] = newVar; } ////// Update vars in just this node (and not the entire subtree) /// Does *not* recompute the nodeinfo - there are at least some consumers of this /// function that do not want the recomputation - transformation rules, for example /// /// current node internal virtual void RemapNode(Node node) { if (m_varMap.Count == 0) { return; } VisitNode(node); } ////// Update vars in this subtree. Recompute the nodeinfo along the way /// /// subtree to "remap" internal virtual void RemapSubtree(Node subTree) { if (m_varMap.Count == 0) { return; } foreach (Node chi in subTree.Children) { RemapSubtree(chi); } RemapNode(subTree); m_command.RecomputeNodeInfo(subTree); } ////// Produce a a new remapped varList /// /// ///remapped varList internal VarList RemapVarList(VarList varList) { return Command.CreateVarList(MapVars(varList)); } ////// Remap the given varList using the given varMap /// /// /// /// internal static VarList RemapVarList(Command command, Dictionary varMap, VarList varList) { VarRemapper varRemapper = new VarRemapper(command, varMap); return varRemapper.RemapVarList(varList); } #endregion #region Private methods ////// Get the mapping for a Var - returns the var itself, mapping was found /// /// ///private Var Map(Var v) { Var newVar; while (true) { if (!m_varMap.TryGetValue(v, out newVar)) { return v; } v = newVar; } } private IEnumerable MapVars(IEnumerable vars) { foreach (Var v in vars) { yield return Map(v); } } private void Map(VarVec vec) { VarVec newVec = m_command.CreateVarVec(MapVars(vec)); vec.InitFrom(newVec); } private void Map(VarList varList) { VarList newList = Command.CreateVarList(MapVars(varList)); varList.Clear(); varList.AddRange(newList); } private void Map(VarMap varMap) { VarMap newVarMap = new VarMap(); foreach (KeyValuePair kv in varMap) { Var newVar = Map(kv.Value); newVarMap.Add(kv.Key, newVar); } varMap.Clear(); foreach (KeyValuePair kv in newVarMap) { varMap.Add(kv.Key, kv.Value); } } private void Map(List sortKeys) { VarVec sortVars = m_command.CreateVarVec(); bool hasDuplicates = false; // // Map each var in the sort list. Remapping may introduce duplicates, and // we should get rid of duplicates, since sql doesn't like them // foreach (InternalTrees.SortKey sk in sortKeys) { sk.Var = Map(sk.Var); if (sortVars.IsSet(sk.Var)) { hasDuplicates = true; } sortVars.Set(sk.Var); } // // Get rid of any duplicates // if (hasDuplicates) { List newSortKeys = new List (sortKeys); sortKeys.Clear(); sortVars.Clear(); foreach (InternalTrees.SortKey sk in newSortKeys) { if (!sortVars.IsSet(sk.Var)) { sortKeys.Add(sk); } sortVars.Set(sk.Var); } } } #region VisitorMethods /// /// Default visitor for a node - does not visit the children /// The reason we have this method is because the default VisitDefault /// actually visits the children, and we don't want to do that /// /// protected override void VisitDefault(Node n) { // Do nothing. } #region ScalarOps public override void Visit(VarRefOp op, Node n) { VisitScalarOpDefault(op, n); Var newVar = Map(op.Var); if (newVar != op.Var) { n.Op = m_command.CreateVarRefOp(newVar); } } #endregion #region AncillaryOps #endregion #region PhysicalOps protected override void VisitNestOp(NestBaseOp op, Node n) { throw EntityUtil.NotSupported(); } public override void Visit(PhysicalProjectOp op, Node n) { VisitPhysicalOpDefault(op, n); Map(op.Outputs); SimpleCollectionColumnMap newColumnMap = (SimpleCollectionColumnMap)ColumnMapTranslator.Translate(op.ColumnMap, m_varMap); n.Op = m_command.CreatePhysicalProjectOp(op.Outputs, newColumnMap); } #endregion #region RelOps protected override void VisitGroupByOp(GroupByBaseOp op, Node n) { VisitRelOpDefault(op, n); Map(op.Outputs); Map(op.Keys); } public override void Visit(GroupByIntoOp op, Node n) { VisitGroupByOp(op, n); Map(op.Inputs); } public override void Visit(DistinctOp op, Node n) { VisitRelOpDefault(op, n); Map(op.Keys); } public override void Visit(ProjectOp op, Node n) { VisitRelOpDefault(op, n); Map(op.Outputs); } public override void Visit(UnnestOp op, Node n) { VisitRelOpDefault(op, n); Var newVar = Map(op.Var); if (newVar != op.Var) { n.Op = m_command.CreateUnnestOp(newVar, op.Table); } } protected override void VisitSetOp(SetOp op, Node n) { VisitRelOpDefault(op, n); Map(op.VarMap[0]); Map(op.VarMap[1]); } protected override void VisitSortOp(SortBaseOp op, Node n) { VisitRelOpDefault(op, n); Map(op.Keys); } #endregion #endregion #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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