mcs/class/referencesource/System.Data.Entity/System/Data/Mapping/ViewGeneration/Structures/QualifiedCellIdBoolean.cs

   1 //---------------------------------------------------------------------
   2 // <copyright file="QualifiedCellIdBoolean.cs" company="Microsoft">
   3 //      Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //
   6 // @owner Microsoft
   7 // @backupOwner Microsoft
   8 //---------------------------------------------------------------------
   9
  10 using System.Data.Common.CommandTrees;
  11 using System.Data.Mapping.ViewGeneration.CqlGeneration;
  12 using System.Diagnostics;
  13 using System.Text;
  14
  15 namespace System.Data.Mapping.ViewGeneration.Structures
  16 {
  17     /// <summary>
  18     /// A class that denotes "block_alias.booleanVar", e.g., "T1._from2".
  19     /// It is a subclass of <see cref="CellIdBoolean"/> with an added block alias.
  20     /// </summary>
  21     internal sealed class QualifiedCellIdBoolean : CellIdBoolean
  22     {
  23         #region Constructor
  24         /// <summary>
  25         /// Creates a boolean of the form "<paramref name="block"/>.<paramref name="originalCellNum"/>".
  26         /// </summary>
  27         internal QualifiedCellIdBoolean(CqlBlock block, CqlIdentifiers identifiers, int originalCellNum)
  28             : base(identifiers, originalCellNum)
  29         {
  30             m_block = block;
  31         }
  32         #endregion
  33
  34         #region Fields
  35         private readonly CqlBlock m_block;
  36         #endregion
  37
  38         #region Methods
  39         internal override StringBuilder AsEsql(StringBuilder builder, string blockAlias, bool skipIsNotNull)
  40         {
  41             // QualifiedCellIdBoolean is only used during JOIN processing where there is no single input, hence blockAlias is expected to be null.
  42             Debug.Assert(blockAlias == null, "QualifiedCellIdBoolean: blockAlias mismatch");
  43             return base.AsEsql(builder, m_block.CqlAlias, skipIsNotNull);
  44         }
  45
  46         internal override DbExpression AsCqt(DbExpression row, bool skipIsNotNull)
  47         {
  48             return base.AsCqt(m_block.GetInput(row), skipIsNotNull);
  49         }
  50         #endregion
  51     }
  52 }