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

   1 //---------------------------------------------------------------------
   2 // <copyright file="ReferenceSchema.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;
  13     using System.Data.Metadata.Edm;
  14     using System.Diagnostics;
  15     using System.Xml;
  16
  17     /// <summary>
  18     /// Summary description for UsingElement.
  19     /// </summary>
  20     internal class UsingElement : SchemaElement
  21     {
  22         #region Instance Fields
  23         private string _alias = null;
  24         private string _namespaceName = null;
  25         #endregion
  26
  27         #region Public Methods
  28         /// <summary>
  29         ///
  30         /// </summary>
  31         /// <param name="parentElement"></param>
  32         internal UsingElement(Schema parentElement)
  33         :   base(parentElement)
  34         {
  35         }
  36
  37         #endregion
  38
  39         #region Public Properties
  40         /// <summary>
  41         ///
  42         /// </summary>
  43         public virtual string Alias
  44         {
  45             get
  46             {
  47                 return _alias;
  48             }
  49             private set
  50             {
  51                 _alias = value;
  52             }
  53         }
  54
  55         /// <summary>
  56         ///
  57         /// </summary>
  58         public virtual string NamespaceName
  59         {
  60             get
  61             {
  62                 return _namespaceName;
  63             }
  64             private set
  65             {
  66                 _namespaceName = value;
  67             }
  68         }
  69
  70         /// <summary>
  71         ///
  72         /// </summary>
  73         public override string FQName
  74         {
  75             get
  76             {
  77                 return null;
  78             }
  79         }
  80
  81         #endregion
  82
  83         #region Protected Properties
  84         /// <summary>
  85         ///
  86         /// </summary>
  87         protected override bool ProhibitAttribute(string namespaceUri, string localName)
  88         {
  89             if (base.ProhibitAttribute(namespaceUri, localName))
  90             {
  91                 return true;
  92             }
  93
  94             if (namespaceUri == null && localName == XmlConstants.Name)
  95             {
  96                 return false;
  97             }
  98             return false;
  99
 100         }
 101
 102         protected override bool HandleAttribute(XmlReader reader)
 103         {
 104             if (base.HandleAttribute(reader))
 105             {
 106                 return true;
 107             }
 108             else if (CanHandleAttribute(reader, XmlConstants.Namespace))
 109             {
 110                 HandleNamespaceAttribute(reader);
 111                 return true;
 112             }
 113             else if (CanHandleAttribute(reader, XmlConstants.Alias))
 114             {
 115                 HandleAliasAttribute(reader);
 116                 return true;
 117             }
 118
 119             return false;
 120         }
 121
 122         #endregion
 123
 124         #region Private Methods
 125
 126         /// <summary>
 127         ///
 128         /// </summary>
 129         /// <param name="reader"></param>
 130         private void HandleNamespaceAttribute(XmlReader reader)
 131         {
 132             Debug.Assert(String.IsNullOrEmpty(NamespaceName), "Alias must be set only once");
 133             ReturnValue<string> returnValue = HandleDottedNameAttribute(reader,NamespaceName, null);
 134             if ( returnValue.Succeeded )
 135                 NamespaceName = returnValue.Value;
 136         }
 137
 138         /// <summary>
 139         ///
 140         /// </summary>
 141         /// <param name="reader"></param>
 142         private void HandleAliasAttribute(XmlReader reader)
 143         {
 144             Debug.Assert(String.IsNullOrEmpty(Alias), "Alias must be set only once");
 145             Alias = HandleUndottedNameAttribute(reader, Alias);
 146         }
 147         #endregion
 148     }
 149 }