mcs/class/referencesource/System.Data.Entity/System/Data/Common/CommandTrees/DbSetClause.cs

   1 //---------------------------------------------------------------------
   2 // <copyright file="DbSetClause.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;
  11 using System.Collections.Generic;
  12
  13 using System.Data.Metadata.Edm;
  14 using System.Data.Common.CommandTrees.Internal;
  15 using System.Data.Common.Utils;
  16 using System.Diagnostics;
  17
  18 namespace System.Data.Common.CommandTrees
  19 {
  20     /// <summary>
  21     /// Specifies a clause in a modification operation setting the value of a property.
  22     /// </summary>
  23     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
  24     public sealed class DbSetClause : DbModificationClause
  25     {
  26         private DbExpression _prop;
  27         private DbExpression _val;
  28
  29         internal DbSetClause(DbExpression targetProperty, DbExpression sourceValue)
  30             : base()
  31         {
  32             EntityUtil.CheckArgumentNull(targetProperty, "targetProperty");
  33             EntityUtil.CheckArgumentNull(sourceValue, "sourceValue");
  34             _prop = targetProperty;
  35             _val = sourceValue;
  36         }
  37
  38         /// <summary>
  39         /// Gets an <see cref="DbExpression"/> that specifies the property that should be updated.
  40         /// </summary>
  41         /// <remarks>
  42         /// Constrained to be a <see cref="DbPropertyExpression"/>.
  43         /// </remarks>
  44         public DbExpression Property
  45         {
  46             get
  47             {
  48                 return _prop;
  49             }
  50         }
  51
  52         /// <summary>
  53         /// Gets an <see cref="DbExpression"/> that specifies the new value with which to update the property.
  54         /// </summary>
  55         /// <remarks>
  56         /// Constrained to be a <see cref="DbConstantExpression"/> or <see cref="DbNullExpression"/>
  57         /// </remarks>
  58         public DbExpression Value
  59         {
  60             get
  61             {
  62                 return _val;
  63             }
  64         }
  65
  66         internal override void DumpStructure(ExpressionDumper dumper)
  67         {
  68             dumper.Begin("DbSetClause");
  69             if (null != this.Property)
  70             {
  71                 dumper.Dump(this.Property, "Property");
  72             }
  73             if (null != this.Value)
  74             {
  75                 dumper.Dump(this.Value, "Value");
  76             }
  77             dumper.End("DbSetClause");
  78         }
  79
  80         internal override TreeNode Print(DbExpressionVisitor<TreeNode> visitor)
  81         {
  82             TreeNode node = new TreeNode("DbSetClause");
  83             if (null != this.Property)
  84             {
  85                 node.Children.Add(new TreeNode("Property", this.Property.Accept(visitor)));
  86             }
  87             if (null != this.Value)
  88             {
  89                 node.Children.Add(new TreeNode("Value", this.Value.Accept(visitor)));
  90             }
  91             return node;
  92         }
  93     }
  94 }