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

   1 //---------------------------------------------------------------------
   2 // <copyright file="CellIdBoolean.cs" company="Microsoft">
   3 //      Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //
   6 // @owner Microsoft
   7 // @backupOwner Microsoft
   8 //---------------------------------------------------------------------
   9
  10 namespace System.Data.Mapping.ViewGeneration.Structures
  11 {
  12     using System.Collections.Generic;
  13     using System.Data.Common.CommandTrees;
  14     using System.Data.Common.CommandTrees.ExpressionBuilder;
  15     using System.Data.Mapping.ViewGeneration.CqlGeneration;
  16     using System.Diagnostics;
  17     using System.Text;
  18
  19     /// <summary>
  20     /// Wraps from0, from1, etc. boolean fields that identify the source of tuples (# of respective cell query) in the view statements.
  21     /// </summary>
  22     internal class CellIdBoolean : TrueFalseLiteral
  23     {
  24         #region Constructor
  25         /// <summary>
  26         /// Creates a boolean expression for the variable name specified by <paramref name="index"/>, e.g., 0 results in from0, 1 into from1.
  27         /// </summary>
  28         internal CellIdBoolean(CqlIdentifiers identifiers, int index)
  29         {
  30             Debug.Assert(index >= 0);
  31             m_index = index;
  32             m_slotName = identifiers.GetFromVariable(index);
  33         }
  34         #endregion
  35
  36         #region Fields
  37         /// <summary>
  38         /// e.g., from0, from1.
  39         /// </summary>
  40         private readonly int m_index;
  41         private readonly string m_slotName;
  42         #endregion
  43
  44         #region Properties
  45         /// <summary>
  46         /// Returns the slotName corresponding to this, ie., _from0 etc.
  47         /// </summary>
  48         internal string SlotName
  49         {
  50             get { return m_slotName; }
  51         }
  52         #endregion
  53
  54         #region BoolLiteral members
  55         internal override StringBuilder AsEsql(StringBuilder builder, string blockAlias, bool skipIsNotNull)
  56         {
  57             // Get e.g., T2._from1 using the table alias
  58             string qualifiedName = CqlWriter.GetQualifiedName(blockAlias, SlotName);
  59             builder.Append(qualifiedName);
  60             return builder;
  61         }
  62
  63         internal override DbExpression AsCqt(DbExpression row, bool skipIsNotNull)
  64         {
  65             // Get e.g., row._from1
  66             return row.Property(SlotName);
  67         }
  68
  69         internal override StringBuilder AsUserString(StringBuilder builder, string blockAlias, bool skipIsNotNull)
  70         {
  71             return AsEsql(builder, blockAlias, skipIsNotNull);
  72         }
  73
  74         internal override StringBuilder AsNegatedUserString(StringBuilder builder, string blockAlias, bool skipIsNotNull)
  75         {
  76             builder.Append("NOT(");
  77             builder = AsUserString(builder, blockAlias, skipIsNotNull);
  78             builder.Append(")");
  79             return builder;
  80         }
  81
  82         internal override void GetRequiredSlots(MemberProjectionIndex projectedSlotMap, bool[] requiredSlots)
  83         {
  84             // The slot corresponding to from1, etc
  85             int numBoolSlots = requiredSlots.Length - projectedSlotMap.Count;
  86             int slotNum = projectedSlotMap.BoolIndexToSlot(m_index, numBoolSlots);
  87             requiredSlots[slotNum] = true;
  88         }
  89
  90         protected override bool IsEqualTo(BoolLiteral right)
  91         {
  92             CellIdBoolean rightBoolean = right as CellIdBoolean;
  93             if (rightBoolean == null)
  94             {
  95                 return false;
  96             }
  97             return m_index == rightBoolean.m_index;
  98         }
  99
 100         public override int GetHashCode()
 101         {
 102             return m_index.GetHashCode();
 103         }
 104
 105         internal override BoolLiteral RemapBool(Dictionary<MemberPath, MemberPath> remap)
 106         {
 107             return this;
 108         }
 109         #endregion
 110
 111         #region Other Methods
 112         internal override void ToCompactString(StringBuilder builder)
 113         {
 114             builder.Append(SlotName);
 115         }
 116         #endregion
 117     }
 118 }