mcs/class/System.Web/System.Web.Compilation/ConnectionStringsExpressionBuilder.cs

   1 //
   2 // System.Web.Compilation.ConnectionStringsExpressionBuilder
   3 //
   4 // Authors:
   5 //      Chris Toshok (toshok@ximian.com)
   6 //
   7 // (C) 2006 Novell, Inc (http://www.novell.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if NET_2_0
  32
  33 using System;
  34 using System.CodeDom;
  35 using System.Configuration;
  36 using System.Web.Configuration;
  37 using System.Web.UI;
  38
  39 namespace System.Web.Compilation {
  40
  41         [ExpressionEditor("System.Web.UI.Design.ConnectionStringsExpressionEditor, " + Consts.AssemblySystem_Design)]
  42         [ExpressionPrefix("ConnectionStrings")]
  43         public class ConnectionStringsExpressionBuilder : ExpressionBuilder {
  44
  45                 public override object EvaluateExpression (object target, BoundPropertyEntry entry,
  46                                                            object parsedData, ExpressionBuilderContext context)
  47                 {
  48                         return GetConnectionString (entry.Expression.Trim());
  49                 }
  50
  51                 public override CodeExpression GetCodeExpression (BoundPropertyEntry entry, object parsedData,
  52                                                                   ExpressionBuilderContext context)
  53                 {
  54                         Pair connString = parsedData as Pair;
  55                         return new CodeMethodInvokeExpression (
  56                                 new CodeTypeReferenceExpression (typeof (ConnectionStringsExpressionBuilder)),
  57                                 (bool)connString.Second ? "GetConnectionStringProviderName" : "GetConnectionString",
  58                                 new CodeExpression [] {new CodePrimitiveExpression (connString.First)}
  59                         );
  60                 }
  61
  62                 public static string GetConnectionString (string connectionStringName)
  63                 {
  64                         ConnectionStringSettings conn = WebConfigurationManager.ConnectionStrings [connectionStringName];
  65                         if (conn == null)
  66                                 return String.Empty;
  67                         else
  68                                 return conn.ConnectionString;
  69                 }
  70
  71                 public static string GetConnectionStringProviderName (string connectionStringName)
  72                 {
  73                         ConnectionStringSettings conn = WebConfigurationManager.ConnectionStrings [connectionStringName];
  74                         if (conn == null)
  75                                 return String.Empty;
  76                         else
  77                                 return conn.ProviderName;
  78                 }
  79
  80                 public override object ParseExpression (string expression, Type propertyType, ExpressionBuilderContext context)
  81                 {
  82                         bool wantsProviderName = false;
  83                         string connStringName = String.Empty;
  84
  85                         if (!String.IsNullOrEmpty (expression)) {
  86                                 int subidx = expression.Length;
  87
  88                                 if (expression.EndsWith (".providername", StringComparison.InvariantCultureIgnoreCase)) {
  89                                         wantsProviderName = true;
  90                                         subidx -= 13;
  91                                 } else if (expression.EndsWith (".connectionstring", StringComparison.InvariantCultureIgnoreCase))
  92                                         subidx -= 17;
  93
  94                                 connStringName = expression.Substring (0, subidx);
  95                         }
  96
  97                         return new Pair (connStringName, wantsProviderName);
  98                 }
  99
 100                 public override bool SupportsEvaluate {
 101                         get { return true; }
 102                 }
 103         }
 104
 105 }
 106
 107 #endif
 108
 109