Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / CqlGeneration / JoinCqlBlock.cs / 1305376 / JoinCqlBlock.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Data.Common.Utils; using System.Text; using System.Collections.Generic; using System.Data.Mapping.ViewGeneration.Structures; namespace System.Data.Mapping.ViewGeneration.CqlGeneration { // This class corresponds to the various Join nodes in the view, i.e., // IJ, LOJ, FOJ internal class JoinCqlBlock : CqlBlock { #region Constructor // effects: Creates a Join CqlBlock (type given by opType) with // SELECT (slotinfos), FROM (children), ON (onClauses - one for each child except 0th), // WHERE (true), AS (blockAliasNum) internal JoinCqlBlock(CellTreeOpType opType, SlotInfo[] slotInfos, Listchildren, List onClauses, CqlIdentifiers identifiers, int blockAliasNum) : base(slotInfos, children, BoolExpression.True, identifiers, blockAliasNum) { m_opType = opType; m_onClauses = onClauses; } #endregion #region Fields private CellTreeOpType m_opType; // LOJ or IJ etc private List m_onClauses; #endregion #region Methods // effects: See CqlBlock.AsCql internal override StringBuilder AsCql(StringBuilder builder, bool isTopLevel, int indentLevel) { // The SELECT part GenerateProjectedtList(builder, indentLevel, CqlAlias, true); // The FROM part by joining all the children using ON Clauses builder.Append("FROM "); int i = 0; foreach (CqlBlock child in Children) { if (i > 0) { StringUtil.IndentNewLine(builder, indentLevel + 1); builder.Append(OpCellTreeNode.OpToCql(m_opType)); } builder.Append(" ("); child.AsCql(builder, false, indentLevel + 1); builder.Append(") AS ") .Append(child.CqlAlias); // The ON part if (i > 0) { StringUtil.IndentNewLine(builder, indentLevel + 1); builder.Append("ON "); m_onClauses[i - 1].AsCql(builder); } i++; } return builder; } #endregion // A class that represents "slot1 == slot2 AND "slot3 == slot4" ... // for two join blocks. That is, it is complete ON clause internal class OnClause : InternalBase { #region Constructor internal OnClause() { m_singleClauses = new List (); } #endregion #region Fields private List m_singleClauses; #endregion #region Methods // effects: Modified builder to contain a Cql string of the form "Slot1 = Slot2 AND // slot3 = slot4 AND ... Returns the builder internal StringBuilder AsCql(StringBuilder builder) { bool isFirst = true; foreach (SingleClause singleClause in m_singleClauses) { if (false == isFirst) { builder.Append(" AND "); } singleClause.AsCql(builder); isFirst = false; } return builder; } // effects: Adds an OnClause element for a join of the form "firstSlot = secondSlot" internal void Add(AliasedSlot firstSlot, AliasedSlot secondSlot) { SingleClause singleClause = new SingleClause(firstSlot, secondSlot); m_singleClauses.Add(singleClause); } internal override void ToCompactString(StringBuilder builder) { builder.Append("ON "); StringUtil.ToSeparatedString(builder, m_singleClauses, " AND "); } #endregion #region Struct // Denotes an expression between slots of the form: FirstSlot == SecondSlot private class SingleClause : InternalBase { internal SingleClause(AliasedSlot firstSlot, AliasedSlot secondSlot) { m_firstSlot = firstSlot; m_secondSlot = secondSlot; } #region Fields private AliasedSlot m_firstSlot; private AliasedSlot m_secondSlot; #endregion #region Methods // effects: Modifies builder to constain the Cql string of the form "firstSlot = secondSlot" // Returns the modified builder internal StringBuilder AsCql(StringBuilder builder) { builder.Append(m_firstSlot.FullCqlAlias()) .Append(" = ") .Append(m_secondSlot.FullCqlAlias()); return builder; } internal override void ToCompactString(StringBuilder builder) { m_firstSlot.ToCompactString(builder); builder.Append(" = "); m_secondSlot.ToCompactString(builder); } #endregion } #endregion } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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