mcs/class/referencesource/System.Data.Entity/System/Data/EntityModel/SchemaObjectModel/OnOperation.cs

   1 //---------------------------------------------------------------------
   2 // <copyright file="OnOperation.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.EntityModel.SchemaObjectModel
  11 {
  12     using System.Data.Metadata.Edm;
  13     using System.Data.Objects.DataClasses;
  14     using System.Diagnostics;
  15     using System.Xml;
  16
  17     /// <summary>
  18     /// Represents an OnDelete, OnCopy, OnSecure, OnLock or OnSerialize element
  19     /// </summary>
  20     internal sealed class OnOperation : SchemaElement
  21     {
  22         private Operation _Operation;
  23         private Action _Action;
  24         /// <summary>
  25         ///
  26         /// </summary>
  27         /// <param name="parentElement"></param>
  28         /// <param name="operation"></param>
  29         public OnOperation(RelationshipEnd parentElement, Operation operation)
  30         : base(parentElement)
  31         {
  32             Operation = operation;
  33         }
  34
  35         /// <summary>
  36         /// The operation
  37         /// </summary>
  38         public Operation Operation
  39         {
  40             get
  41             {
  42                 return _Operation;
  43             }
  44             private set
  45             {
  46                 _Operation = value;
  47             }
  48         }
  49
  50         /// <summary>
  51         /// The action
  52         /// </summary>
  53         public Action Action
  54         {
  55             get
  56             {
  57                 return _Action;
  58             }
  59             private set
  60             {
  61                 _Action = value;
  62             }
  63         }
  64
  65         protected override bool ProhibitAttribute(string namespaceUri, string localName)
  66         {
  67             if (base.ProhibitAttribute(namespaceUri, localName))
  68             {
  69                 return true;
  70             }
  71
  72             if (namespaceUri == null && localName == XmlConstants.Name)
  73             {
  74                 return false;
  75             }
  76             return false;
  77
  78         }
  79
  80         protected override bool HandleAttribute(XmlReader reader)
  81         {
  82             if (base.HandleAttribute(reader))
  83             {
  84                 return true;
  85             }
  86             else if (CanHandleAttribute(reader, XmlConstants.Action))
  87             {
  88                 HandleActionAttribute(reader);
  89                 return true;
  90             }
  91
  92             return false;
  93         }
  94
  95         /// <summary>
  96         /// Handle the Action attribute
  97         /// </summary>
  98         /// <param name="reader">reader positioned at Action attribute</param>
  99         private void HandleActionAttribute(XmlReader reader)
 100         {
 101             Debug.Assert(reader != null);
 102
 103             RelationshipKind relationshipKind = ParentElement.ParentElement.RelationshipKind;
 104
 105             switch ( reader.Value.Trim() )
 106             {
 107                 case "None":
 108                     Action = Action.None;
 109                     break;
 110                 case "Cascade":
 111                     Action = Action.Cascade;
 112                     break;
 113                 default:
 114                     AddError( ErrorCode.InvalidAction, EdmSchemaErrorSeverity.Error, reader, System.Data.Entity.Strings.InvalidAction(reader.Value, ParentElement.FQName ) );
 115                     break;
 116             }
 117         }
 118
 119         /// <summary>
 120         /// the parent element.
 121             /// </summary>
 122         private new RelationshipEnd ParentElement
 123         {
 124             get
 125             {
 126                 return (RelationshipEnd)base.ParentElement;
 127             }
 128         }
 129     }
 130 }