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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / Structures / Cell.cs / 1305376 / Cell.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Data.Common.Utils; using System.Collections.Generic; using System.Data.Mapping.ViewGeneration.Validation; using System.Text; using System.Diagnostics; using System.Data.Metadata.Edm; namespace System.Data.Mapping.ViewGeneration.Structures { ////// This class contains a pair of cell queries which is essentially a /// constraint that they are equal. A cell is initialized with a C or an /// S Query which it exposes as properties but it also has the notion of /// "Left" and "Right" queries -- left refers to the side for which a /// view is being generated /// For example, to /// specify a mapping for CPerson to an SPerson table, we have /// /// [(p type Person) in P : SPerson] /// (p.pid, pid) /// (p.name, name) /// /// This really denotes the equality of two queries: /// (C) SELECT (p type Person) AS D1, p.pid, p.name FROM p in P WHERE D1 /// (S) SELECT True AS D1, pid, name FROM SPerson WHERE D1 /// /// For more details, see the design doc /// internal class Cell : InternalBase { #region Constructor // effects: Creates a cell with the C and S queries private Cell(CellQuery cQuery, CellQuery sQuery, CellLabel label, int cellNumber) { Debug.Assert(label != null, "Cell lacks label"); m_cQuery = cQuery; m_sQuery = sQuery; m_label = label; m_cellNumber = cellNumber; Debug.Assert(m_sQuery.NumProjectedSlots == m_cQuery.NumProjectedSlots, "Cell queries disagree on the number of projected fields"); } ////// Copy Constructor /// internal Cell(Cell source) { m_cQuery = new CellQuery(source.m_cQuery); m_sQuery = new CellQuery(source.m_sQuery); m_label = new CellLabel(source.m_label); m_cellNumber = source.m_cellNumber; } #endregion #region Fields private CellQuery m_cQuery; private CellQuery m_sQuery; private int m_cellNumber; // cell number that identifies this cell private CellLabel m_label; // The File and Path Info for the CSMappingFragment // that the Cell was constructed over. // The view cell relation for all projected slots in this private ViewCellRelation m_viewCellRelation; #endregion #region Properties // effects: Returns the C query internal CellQuery CQuery { get { return m_cQuery; } } // effects: Returns the S query internal CellQuery SQuery { get { return m_sQuery; } } // effects: Returns the CSMappingFragment (if any) // that the Cell was constructed over. internal CellLabel CellLabel { get { return m_label; } } // effects: Returns the cell label (if any) internal int CellNumber { get { return m_cellNumber; } } internal string CellNumberAsString { get { return StringUtil.FormatInvariant("V{0}", CellNumber); } } #endregion #region Methods // effects: Determines all the identifiers used in this and adds them to identifiers internal void GetIdentifiers(CqlIdentifiers identifiers) { m_cQuery.GetIdentifiers(identifiers); m_sQuery.GetIdentifiers(identifiers); } // effects: Given a cell, determines the paths to which the paths in // columns map to in the C-space and returns them. If some columns // are not projected in the cell, or if the corresponding properties // are not mapped into C-space, returns null internal SetGetCSlotsForTableColumns(IEnumerable columns) { List fieldNums = SQuery.GetProjectedPositions(columns); if (fieldNums == null) { return null; } // The fields are mapped -- see if they are mapped on the // cSide and they correspond to the primary key of the // entity set Set cSideMembers = new Set (); foreach (int fieldNum in fieldNums) { ProjectedSlot projectedSlot = CQuery.ProjectedSlotAt(fieldNum); MemberProjectedSlot slot = projectedSlot as MemberProjectedSlot; if (slot != null) { // We can call LastMember since columns do not map to // extents or memberEnds. Can cast to EdmProperty since it // cannot be an association end cSideMembers.Add((EdmProperty)slot.MemberPath.LeafEdmMember); } else { return null; } } return cSideMembers; } // effects: Returns the C query for ViewTarget.QueryView and S query for ViewTarget.UpdateView internal CellQuery GetLeftQuery(ViewTarget side) { return side == ViewTarget.QueryView ? m_cQuery : m_sQuery; } // effects: Returns the S query for ViewTarget.QueryView and C query for ViewTarget.UpdateView internal CellQuery GetRightQuery(ViewTarget side) { return side == ViewTarget.QueryView ? m_sQuery : m_cQuery; } // effects: Returns the relation that contains all the slots being // projected in this cell internal ViewCellRelation CreateViewCellRelation(int cellNumber) { if (m_viewCellRelation != null) { return m_viewCellRelation; } GenerateCellRelations(cellNumber); return m_viewCellRelation; } private void GenerateCellRelations(int cellNumber) { // Generate the view cell relation List projectedSlots = new List (); // construct a ViewCellSlot for each slot Debug.Assert(CQuery.NumProjectedSlots == SQuery.NumProjectedSlots, "Cell queries in cell have a different number of slots"); for (int i = 0; i < CQuery.NumProjectedSlots; i++) { ProjectedSlot cSlot = CQuery.ProjectedSlotAt(i); ProjectedSlot sSlot = SQuery.ProjectedSlotAt(i); Debug.Assert(cSlot != null, "Has cell query been normalized?"); Debug.Assert(sSlot != null, "Has cell query been normalized?"); // These slots better be JoinTreeSlots. We do not have constants etc at this point // The code below should crash if they are not MemberProjectedSlot cJoinSlot = (MemberProjectedSlot)cSlot; MemberProjectedSlot sJoinSlot = (MemberProjectedSlot)sSlot; ViewCellSlot slot = new ViewCellSlot(i, cJoinSlot, sJoinSlot); projectedSlots.Add(slot); } m_viewCellRelation = new ViewCellRelation(this, projectedSlots, cellNumber); } internal override void ToCompactString(StringBuilder builder) { CQuery.ToCompactString(builder); builder.Append(" = "); SQuery.ToCompactString(builder); } internal override void ToFullString(StringBuilder builder) { CQuery.ToFullString(builder); builder.Append(" = "); SQuery.ToFullString(builder); } public override string ToString() { return ToFullString(); } // effects: Prints the cells in some human-readable form internal static void CellsToBuilder(StringBuilder builder, IEnumerable cells) { // Print mapping builder.AppendLine(); builder.AppendLine("========================================================================="); foreach (Cell cell in cells) { builder.AppendLine(); StringUtil.FormatStringBuilder(builder, "Mapping Cell V{0}:", cell.CellNumber); builder.AppendLine(); builder.Append("C: "); cell.CQuery.ToFullString(builder); builder.AppendLine(); builder.AppendLine(); builder.Append("S: "); cell.SQuery.ToFullString(builder); builder.AppendLine(); } } #endregion #region Factory methods internal static Cell CreateCS(CellQuery cQuery, CellQuery sQuery, CellLabel label, int cellNumber) { return new Cell(cQuery, sQuery, label, cellNumber); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. |
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