Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Structures / CellTreeNode.cs / 1305376 / CellTreeNode.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Data.Common.Utils; using System.Data.Common.Utils.Boolean; using System.Collections.Generic; using System.Text; using System.Data.Mapping.ViewGeneration.CqlGeneration; using System.Data.Mapping.ViewGeneration.QueryRewriting; using System.Data.Mapping.ViewGeneration.Utils; using System.Linq; namespace System.Data.Mapping.ViewGeneration.Structures { using WrapperBoolExpr = BoolExpr; using System.Data.Entity; // This class represents a node in the update or query mapping view tree // (of course, the root node represents the full view) // Each node represents an expression of the form: // SELECT FROM WHERE // The WHERE clause is of the form X1 OR X2 OR ... where each Xi is a multiconstant internal abstract partial class CellTreeNode : InternalBase { #region Constructor // effects: Creates a cell tree node with a reference to projectedSlotMap for // deciphering the fields in this protected CellTreeNode(ViewgenContext context) { m_viewgenContext = context; } // effects: returns a copy of the tree below node internal CellTreeNode MakeCopy() { DefaultCellTreeVisitor visitor = new DefaultCellTreeVisitor (); CellTreeNode result = Accept (visitor, true); return result; } #endregion #region Fields private ViewgenContext m_viewgenContext; #endregion #region Properties // effects: Returns the operation being performed by this node internal abstract CellTreeOpType OpType { get; } // effects: Returns the right domain map associated with this celltreenode internal abstract MemberDomainMap RightDomainMap { get; } internal abstract FragmentQuery LeftFragmentQuery { get; } internal abstract FragmentQuery RightFragmentQuery { get; } internal bool IsEmptyRightFragmentQuery { get { return !m_viewgenContext.RightFragmentQP.IsSatisfiable(RightFragmentQuery); } } // effects: Returns the attributes available/projected from this node internal abstract Set Attributes { get; } // effects: Returns the children of this node internal abstract List Children { get; } // effects: Returns the number of slots projected from this node internal abstract int NumProjectedSlots { get; } // effects: Returns the number of boolean slots in this node internal abstract int NumBoolSlots { get; } internal MemberProjectionIndex ProjectedSlotMap { get { return m_viewgenContext.MemberMaps.ProjectedSlotMap; } } internal ViewgenContext ViewgenContext { get { return m_viewgenContext; } } #endregion #region Abstract Methods // effects: Given a leaf cell node and the slots required by the parent, returns // a CqlBlock corresponding to the tree rooted at this internal abstract CqlBlock ToCqlBlock(bool[] requiredSlots, CqlIdentifiers identifiers, ref int blockAliasNum, ref List withStatements); // Effects: Returns true if slot at slot number "slot" is projected // by some node in tree rooted at this internal abstract bool IsProjectedSlot(int slot); // Standard accept method for visitor pattern. TOutput is the return // type for visitor methods. internal abstract TOutput Accept (CellTreeVisitor visitor, TInput param); internal abstract TOutput Accept (SimpleCellTreeVisitor visitor, TInput param); #endregion #region Visitor methods // effects: Given a cell tree node , removes unnecessary // "nesting" that occurs in the tree -- an unnecessary nesting // occurs when a node has exactly one child. internal CellTreeNode Flatten() { return FlatteningVisitor.Flatten(this); } // effects: Gets all the leaves in this internal List GetLeaves() { return GetLeafNodes().Select(leafNode => leafNode.LeftCellWrapper).ToList(); } // effects: Gets all the leaves in this internal IEnumerable GetLeafNodes() { return LeafVisitor.GetLeaves(this); } // effects: Like Flatten, flattens the tree and then collapses // associative operators, e.g., (A IJ B) IJ C is changed to A IJ B IJ C internal CellTreeNode AssociativeFlatten() { return AssociativeOpFlatteningVisitor.Flatten(this); } #endregion #region Helper methods, e.g., for slots and strings // effects: Returns true iff the Op (e.g., IJ) is associative, i.e., // A OP (B OP C) is the same as (A OP B) OP C or A OP B OP C internal static bool IsAssociativeOp(CellTreeOpType opType) { // This is not true for LOJ and LASJ return opType == CellTreeOpType.IJ || opType == CellTreeOpType.Union || opType == CellTreeOpType.FOJ; } // effects: Returns an array of booleans where bool[i] is set to true // iff some node in the tree rooted at node projects that slot internal bool[] GetProjectedSlots() { // Gets the information on the normal and the boolean slots int totalSlots = ProjectedSlotMap.Count + NumBoolSlots; bool[] slots = new bool[totalSlots]; for (int i = 0; i < totalSlots; i++) { slots[i] = IsProjectedSlot(i); } return slots; } // effects: Given a slot number, slotNum, returns the output member path // that this slot contributes/corresponds to in the extent view. If // the slot corresponds to one of the boolean variables, returns null protected MemberPath GetMemberPath(int slotNum) { return ProjectedSlot.GetMemberPath(slotNum, ProjectedSlotMap, NumBoolSlots); } // effects: Given the index of a boolean variable (e.g., of from1), // returns the slot number for that boolean in this protected int BoolIndexToSlot(int boolIndex) { // Booleans appear after the regular slot return ProjectedSlot.BoolIndexToSlot(boolIndex, ProjectedSlotMap, NumBoolSlots); } // effects: Given a slotNum corresponding to a boolean slot, returns // the cel number that the cell corresponds to protected int SlotToBoolIndex(int slotNum) { return ProjectedSlot.SlotToBoolIndex(slotNum, ProjectedSlotMap, NumBoolSlots); } // effects: Returns true if slotNum corresponds to a key slot in the // output extent view protected bool IsKeySlot(int slotNum) { return ProjectedSlot.IsKeySlot(slotNum, ProjectedSlotMap, NumBoolSlots); } // effects: Returns true if slotNum corresponds to a bool slot and // not a regular field protected bool IsBoolSlot(int slotNum) { return ProjectedSlot.IsBoolSlot(slotNum, ProjectedSlotMap, NumBoolSlots); } // effects: Returns the slot numbers corresponding to the key fields // in the m_projectedSlotMap protected IEnumerable KeySlots { get { int numMembers = ProjectedSlotMap.Count; for (int slotNum = 0; slotNum < numMembers; slotNum++) { if (true == IsKeySlot(slotNum)) { yield return slotNum; } } } } // effects: Modifies builder to contain a Cql query corresponding to // the tree rooted at this internal override void ToFullString(StringBuilder builder) { int blockAliasNum = 0; // Get the required slots, get the block and then get the string bool[] requiredSlots = GetProjectedSlots(); // Using empty identifiers over here since we do not use this for the actual CqlGeneration CqlIdentifiers identifiers = new CqlIdentifiers(); List withStatements = new List (); CqlBlock block = ToCqlBlock(requiredSlots, identifiers, ref blockAliasNum, ref withStatements); block.AsCql(builder, false, 1); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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