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

   1 //---------------------------------------------------------------------
   2 // <copyright file="WithStatement.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.Common.CommandTrees.ExpressionBuilder;
  12 using System.Data.Common.Utils;
  13 using System.Text;
  14 using System.Collections.Generic;
  15 using System.Data.Mapping.ViewGeneration.CqlGeneration;
  16 using System.Data.Metadata.Edm;
  17 using System.Diagnostics;
  18 using System.Linq;
  19
  20 namespace System.Data.Mapping.ViewGeneration.Structures
  21 {
  22     /// <summary>
  23     /// A class to denote a part of the WITH RELATIONSHIP clause.
  24     /// </summary>
  25     internal sealed class WithRelationship : InternalBase
  26     {
  27         #region Constructors
  28         internal WithRelationship(AssociationSet associationSet,
  29                                   AssociationEndMember fromEnd,
  30                                   EntityType fromEndEntityType,
  31                                   AssociationEndMember toEnd,
  32                                   EntityType toEndEntityType,
  33                                   IEnumerable<MemberPath> toEndEntityKeyMemberPaths)
  34         {
  35             m_associationSet = associationSet;
  36             m_fromEnd = fromEnd;
  37             m_fromEndEntityType = fromEndEntityType;
  38             m_toEnd = toEnd;
  39             m_toEndEntityType = toEndEntityType;
  40             m_toEndEntitySet = MetadataHelper.GetEntitySetAtEnd(associationSet, toEnd);
  41             m_toEndEntityKeyMemberPaths = toEndEntityKeyMemberPaths;
  42         }
  43         #endregion
  44
  45         #region Fields
  46         private readonly AssociationSet m_associationSet;
  47         private readonly RelationshipEndMember m_fromEnd;
  48         private readonly EntityType m_fromEndEntityType;
  49         private readonly RelationshipEndMember m_toEnd;
  50         private readonly EntityType m_toEndEntityType;
  51         private readonly EntitySet m_toEndEntitySet;
  52         private readonly IEnumerable<MemberPath> m_toEndEntityKeyMemberPaths;
  53         #endregion
  54
  55         #region Properties
  56         internal EntityType FromEndEntityType
  57         {
  58             get { return m_fromEndEntityType; }
  59         }
  60         #endregion
  61
  62         #region Methods
  63         internal StringBuilder AsEsql(StringBuilder builder, string blockAlias, int indentLevel)
  64         {
  65             StringUtil.IndentNewLine(builder, indentLevel + 1);
  66             builder.Append("RELATIONSHIP(");
  67             List<string> fields = new List<string>();
  68             // If the variable is a relation end, we will gets it scope Extent, e.g., CPerson1 for the CPerson end of CPersonAddress1.
  69             builder.Append("CREATEREF(");
  70             CqlWriter.AppendEscapedQualifiedName(builder, m_toEndEntitySet.EntityContainer.Name, m_toEndEntitySet.Name);
  71             builder.Append(", ROW(");
  72             foreach (MemberPath memberPath in m_toEndEntityKeyMemberPaths)
  73             {
  74                 string fullFieldAlias = CqlWriter.GetQualifiedName(blockAlias, memberPath.CqlFieldAlias);
  75                 fields.Add(fullFieldAlias);
  76             }
  77             StringUtil.ToSeparatedString(builder, fields, ", ", null);
  78             builder.Append(')');
  79             builder.Append(",");
  80             CqlWriter.AppendEscapedTypeName(builder, m_toEndEntityType);
  81             builder.Append(')');
  82
  83             builder.Append(',');
  84             CqlWriter.AppendEscapedTypeName(builder, m_associationSet.ElementType);
  85             builder.Append(',');
  86             CqlWriter.AppendEscapedName(builder, m_fromEnd.Name);
  87             builder.Append(',');
  88             CqlWriter.AppendEscapedName(builder, m_toEnd.Name);
  89             builder.Append(')');
  90             builder.Append(' ');
  91             return builder;
  92         }
  93
  94         internal DbRelatedEntityRef AsCqt(DbExpression row)
  95         {
  96             return DbExpressionBuilder.CreateRelatedEntityRef(
  97                 m_fromEnd,
  98                 m_toEnd,
  99                 m_toEndEntitySet.CreateRef(m_toEndEntityType, m_toEndEntityKeyMemberPaths.Select(keyMember => row.Property(keyMember.CqlFieldAlias))));
 100         }
 101
 102         /// <summary>
 103         /// Not supported in this class.
 104         /// </summary>
 105         internal override void ToCompactString(StringBuilder builder)
 106         {
 107             Debug.Fail("Should not be called.");
 108         }
 109         #endregion
 110     }
 111 }