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

   1 //---------------------------------------------------------------------
   2 // <copyright file="CaseStatementProjectedSlot.cs" company="Microsoft">
   3 //      Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //
   6 // @owner [....]
   7 // @backupOwner [....]
   8 //---------------------------------------------------------------------
   9
  10 using System.Data.Mapping.ViewGeneration.CqlGeneration;
  11 using System.Text;
  12 using System.Collections.Generic;
  13 using System.Data.Common.CommandTrees;
  14 using System.Data.Common.CommandTrees.ExpressionBuilder;
  15
  16 namespace System.Data.Mapping.ViewGeneration.Structures
  17 {
  18     /// <summary>
  19     /// This class is just a wrapper over case statements so that we don't pollute the <see cref="CaseStatement"/> class itself.
  20     /// </summary>
  21     internal sealed class CaseStatementProjectedSlot : ProjectedSlot
  22     {
  23         #region Constructor
  24         /// <summary>
  25         /// Creates a slot for <paramref name="statement"/>.
  26         /// </summary>
  27         internal CaseStatementProjectedSlot(CaseStatement statement, IEnumerable<WithRelationship> withRelationships)
  28         {
  29             m_caseStatement = statement;
  30             m_withRelationships = withRelationships;
  31         }
  32         #endregion
  33
  34         #region Fields
  35         /// <summary>
  36         /// The actual case statement.
  37         /// </summary>
  38         private readonly CaseStatement m_caseStatement;
  39         private readonly IEnumerable<WithRelationship> m_withRelationships;
  40         #endregion
  41
  42         #region Methods
  43         /// <summary>
  44         /// Creates new <see cref="ProjectedSlot"/> that is qualified with <paramref name="block"/>.CqlAlias.
  45         /// If current slot is composite (such as <see cref="CaseStatementProjectedSlot"/>, then this method recursively qualifies all parts
  46         /// and returns a new deeply qualified slot (as opposed to <see cref="CqlBlock.QualifySlotWithBlockAlias"/>).
  47         /// </summary>
  48         internal override ProjectedSlot DeepQualify(CqlBlock block)
  49         {
  50             CaseStatement newStatement = m_caseStatement.DeepQualify(block);
  51             return new CaseStatementProjectedSlot(newStatement, null);
  52         }
  53
  54         internal override StringBuilder AsEsql(StringBuilder builder, MemberPath outputMember, string blockAlias, int indentLevel)
  55         {
  56             m_caseStatement.AsEsql(builder, m_withRelationships, blockAlias, indentLevel);
  57             return builder;
  58         }
  59
  60         internal override DbExpression AsCqt(DbExpression row, MemberPath outputMember)
  61         {
  62             return m_caseStatement.AsCqt(row, m_withRelationships);
  63         }
  64
  65         internal override void ToCompactString(StringBuilder builder)
  66         {
  67             m_caseStatement.ToCompactString(builder);
  68         }
  69         #endregion
  70     }
  71 }