Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / CqlGeneration / CaseCqlBlock.cs / 1305376 / CaseCqlBlock.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Data.Mapping.ViewGeneration.Structures; using System.Text; using System.Collections.Generic; using System.Data.Common.Utils; using System.Diagnostics; namespace System.Data.Mapping.ViewGeneration.CqlGeneration { // A class to capture CqlBlocks responsible for case statements -- these // are statements needed for generating the variables in the // multiconstants, i.e., complex types, entities, discriminators, etc internal class CaseCqlBlock : CqlBlock { #region Constructors // effects: Creates a case statememt CqlBlock with SELECT (slots), // FROM (child -- note has only has one child), WHERE (true), AS // (blockAliasNum). caseSlot indicates which slot in slots // corresponds to the single case statement being generated by this block internal CaseCqlBlock(SlotInfo[] slots, int caseSlot, CqlBlock child, BoolExpression whereClause, CqlIdentifiers identifiers, int blockAliasNum) : base(slots, new List(new CqlBlock[] { child }), whereClause, identifiers, blockAliasNum) { m_caseSlotInfo = slots[caseSlot]; } #endregion #region Fields private SlotInfo m_caseSlotInfo; #endregion #region Methods // effects: See CqlBlock.AsCql internal override StringBuilder AsCql(StringBuilder builder, bool isTopLevel, int indentLevel) { // The SELECT part StringUtil.IndentNewLine(builder, indentLevel); // Since we know that the case statement starts on a new line, we // can add a comment after SELECT Debug.Assert(m_caseSlotInfo.MemberPath != null, "We only construct real slots not boolean slots"); builder.Append("SELECT "); if (isTopLevel) { builder.Append("VALUE "); } builder.Append("-- Constructing ") .Append(m_caseSlotInfo.MemberPath.LeafEdmMemberName); Debug.Assert(Children.Count == 1, "Case can have exactly one child"); CqlBlock childBlock = Children[0]; // First emit the case statement "CASE ... END AS Alias" m_caseSlotInfo.AsCql(builder, childBlock.CqlAlias, indentLevel); if (false == isTopLevel) { builder.Append(" AS ") .Append(m_caseSlotInfo.CqlFieldAlias); } // Now get the remaining slots bool isFirst = true; // CHANGE_[....]_IMPROVE: Try to leverage GenerateProjectedtList foreach (SlotInfo slot in Slots) { if (false == slot.IsRequiredByParent || object.ReferenceEquals(slot, m_caseSlotInfo)) { continue; } if (isFirst == true) { // Add , after END and then start new line for first field builder.Append(", "); StringUtil.IndentNewLine(builder, indentLevel + 1); } else { // Simply add a comma for the next field builder.Append(", "); } slot.AsCql(builder, childBlock.CqlAlias, indentLevel); isFirst = false; } // The FROM part: FROM (ChildView) AS AliasName StringUtil.IndentNewLine(builder, indentLevel); builder.Append("FROM ("); // Get the child childBlock.AsCql(builder, false, indentLevel + 1); StringUtil.IndentNewLine(builder, indentLevel); builder.Append(") AS ") .Append(childBlock.CqlAlias); // Get the WHERE part only when the expression is not simply TRUE if (false == BoolExpression.EqualityComparer.Equals(WhereClause, BoolExpression.True)) { StringUtil.IndentNewLine(builder, indentLevel); builder.Append("WHERE "); WhereClause.AsCql(builder, childBlock.CqlAlias); } return builder; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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