Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Structures / CellTreeNodeVisitors.cs / 1305376 / CellTreeNodeVisitors.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections.Generic; using System.Data.Common.Utils.Boolean; using System.Diagnostics; using System.Data.Common.Utils; using System.Data.Metadata.Edm; namespace System.Data.Mapping.ViewGeneration.Structures { using WrapperBoolExpr = BoolExpr; using WrapperTreeExpr = TreeExpr ; using WrapperAndExpr = AndExpr ; using WrapperOrExpr = OrExpr ; using WrapperNotExpr = NotExpr ; using WrapperTermExpr = TermExpr ; using WrapperTrueExpr = TrueExpr ; using WrapperFalseExpr = FalseExpr ; internal partial class CellTreeNode { #region Abstract Visitors // Abstract visitor implementation for Cell trees // TOutput is the return type of the visitor and TInput is a single // parameter that can be passed in internal abstract class CellTreeVisitor { internal abstract TOutput VisitLeaf(LeafCellTreeNode node, TInput param); internal abstract TOutput VisitUnion(OpCellTreeNode node, TInput param); internal abstract TOutput VisitInnerJoin(OpCellTreeNode node, TInput param); internal abstract TOutput VisitLeftOuterJoin(OpCellTreeNode node, TInput param); internal abstract TOutput VisitFullOuterJoin(OpCellTreeNode node, TInput param); internal abstract TOutput VisitLeftAntiSemiJoin(OpCellTreeNode node, TInput param); } // Another abstract visitor that does not distinguish between different // operation nodes internal abstract class SimpleCellTreeVisitor { internal abstract TOutput VisitLeaf(LeafCellTreeNode node, TInput param); internal abstract TOutput VisitOpNode(OpCellTreeNode node, TInput param); } #endregion #region Default CellTree Visitor // Default visitor implementation for CellTreeVisitor // TInput is the type of the parameter that can be passed in to each visit // Returns a CellTreeVisitor as output private class DefaultCellTreeVisitor : CellTreeVisitor { internal override CellTreeNode VisitLeaf(LeafCellTreeNode node, TInput param) { return node; } internal override CellTreeNode VisitUnion(OpCellTreeNode node, TInput param) { return AcceptChildren(node, param); } internal override CellTreeNode VisitInnerJoin(OpCellTreeNode node, TInput param) { return AcceptChildren(node, param); } internal override CellTreeNode VisitLeftOuterJoin(OpCellTreeNode node, TInput param) { return AcceptChildren(node, param); } internal override CellTreeNode VisitFullOuterJoin(OpCellTreeNode node, TInput param) { return AcceptChildren(node, param); } internal override CellTreeNode VisitLeftAntiSemiJoin(OpCellTreeNode node, TInput param) { return AcceptChildren(node, param); } private OpCellTreeNode AcceptChildren(OpCellTreeNode node, TInput param) { List newChildren = new List (); foreach (CellTreeNode child in node.Children) { newChildren.Add(child.Accept(this, param)); } return new OpCellTreeNode(node.ViewgenContext, node.OpType, newChildren); } } #endregion #region Flattening Visitor // Flattens the tree, i.e., pushes up nodes that just have just one child private class FlatteningVisitor : SimpleCellTreeVisitor { #region Constructor/Fields/Invocation protected FlatteningVisitor() { } // effects: Flattens node and returns a new tree that is flattened internal static CellTreeNode Flatten(CellTreeNode node) { FlatteningVisitor visitor = new FlatteningVisitor(); return node.Accept (visitor, true); } #endregion #region Visitors internal override CellTreeNode VisitLeaf(LeafCellTreeNode node, bool dummy) { return node; } // effects: Visits an internal Op node and processes it internal override CellTreeNode VisitOpNode(OpCellTreeNode node, bool dummy) { // Flatten the children first List flattenedChildren = new List (); foreach (CellTreeNode child in node.Children) { CellTreeNode flattenedChild = child.Accept (this, dummy); flattenedChildren.Add(flattenedChild); } Debug.Assert(flattenedChildren.Count >= 1, "node must have more than 1 child and be an OpCellTreeNode"); // If only one child, return that if (flattenedChildren.Count == 1) { return flattenedChildren[0]; } Debug.Assert(flattenedChildren.Count > 1, "Opnode has 0 children?"); Debug.Assert(node.OpType != CellTreeOpType.Leaf, "Wrong op type for operation node"); OpCellTreeNode result = new OpCellTreeNode(node.ViewgenContext, node.OpType, flattenedChildren); return result; } #endregion } #endregion #region AssociativeOpFlatteningVisitor // Flattens associative ops and single children nodes. Like the // FlatteningVisitor, it gets rid of the single children // nodes. Furthermore, it also collapses nodes of associative operations, // i.e., A IJ (B IJ C) is changed to A IJ B IJ C private class AssociativeOpFlatteningVisitor : SimpleCellTreeVisitor { #region Constructor/Fields/Invocation private AssociativeOpFlatteningVisitor() { } internal static CellTreeNode Flatten(CellTreeNode node) { // First do simple flattening and then associative op flattening CellTreeNode newNode = FlatteningVisitor.Flatten(node); AssociativeOpFlatteningVisitor visitor = new AssociativeOpFlatteningVisitor(); return newNode.Accept (visitor, true); } #endregion #region Visitors internal override CellTreeNode VisitLeaf(LeafCellTreeNode node, bool dummy) { return node; } internal override CellTreeNode VisitOpNode(OpCellTreeNode node, bool dummy) { List flattenedChildren = new List (); // Flatten the children first foreach (CellTreeNode child in node.Children) { CellTreeNode flattenedChild = child.Accept (this, dummy); flattenedChildren.Add(flattenedChild); } Debug.Assert(flattenedChildren.Count > 1, "node must have more than 1 child and be an OpCellTreeNode"); // If this op is associative and a child's OP is the same as this // op, add those to be this nodes children List finalChildren = flattenedChildren; if (CellTreeNode.IsAssociativeOp(node.OpType)) { finalChildren = new List (); foreach (CellTreeNode child in flattenedChildren) { if (child.OpType == node.OpType) { finalChildren.AddRange(child.Children); } else { finalChildren.Add(child); } } } OpCellTreeNode result = new OpCellTreeNode(node.ViewgenContext, node.OpType, finalChildren); return result; } #endregion } #endregion #region LeafVisitor // This visitor returns all the leaf tree nodes in this private class LeafVisitor : SimpleCellTreeVisitor > { private LeafVisitor() { } internal static IEnumerable GetLeaves(CellTreeNode node) { LeafVisitor visitor = new LeafVisitor(); return node.Accept >(visitor, true); } internal override IEnumerable VisitLeaf(LeafCellTreeNode node, bool dummy) { yield return node; } internal override IEnumerable VisitOpNode(OpCellTreeNode node, bool dummy) { foreach (CellTreeNode child in node.Children) { IEnumerable children = child.Accept >(this, dummy); foreach (LeafCellTreeNode leafNode in children) { yield return leafNode; } } } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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