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
  32 using System;
  33 using System.CodeDom;
  34 using System.Configuration;
  35 using System.Web.Configuration;
  36 using System.Web.UI;
  37
  38 namespace System.Web.Compilation {
  39
  40         [ExpressionEditor("System.Web.UI.Design.ConnectionStringsExpressionEditor, " + Consts.AssemblySystem_Design)]
  41         [ExpressionPrefix("ConnectionStrings")]
  42         public class ConnectionStringsExpressionBuilder : ExpressionBuilder {
  43
  44                 public override object EvaluateExpression (object target, BoundPropertyEntry entry,
  45                                                            object parsedData, ExpressionBuilderContext context)
  46                 {
  47                         return GetConnectionString (entry.Expression.Trim());
  48                 }
  49
  50                 public override CodeExpression GetCodeExpression (BoundPropertyEntry entry, object parsedData,
  51                                                                   ExpressionBuilderContext context)
  52                 {
  53                         Pair connString = parsedData as Pair;
  54                         return new CodeMethodInvokeExpression (
  55                                 new CodeTypeReferenceExpression (typeof (ConnectionStringsExpressionBuilder)),
  56                                 (bool)connString.Second ? "GetConnectionStringProviderName" : "GetConnectionString",
  57                                 new CodeExpression [] {new CodePrimitiveExpression (connString.First)}
  58                         );
  59                 }
  60
  61                 public static string GetConnectionString (string connectionStringName)
  62                 {
  63                         ConnectionStringSettings conn = WebConfigurationManager.ConnectionStrings [connectionStringName];
  64                         if (conn == null)
  65                                 return String.Empty;
  66                         else
  67                                 return conn.ConnectionString;
  68                 }
  69
  70                 public static string GetConnectionStringProviderName (string connectionStringName)
  71                 {
  72                         ConnectionStringSettings conn = WebConfigurationManager.ConnectionStrings [connectionStringName];
  73                         if (conn == null)
  74                                 return String.Empty;
  75                         else
  76                                 return conn.ProviderName;
  77                 }
  78
  79                 public override object ParseExpression (string expression, Type propertyType, ExpressionBuilderContext context)
  80                 {
  81                         bool wantsProviderName = false;
  82                         string connStringName = String.Empty;
  83
  84                         if (!String.IsNullOrEmpty (expression)) {
  85                                 int subidx = expression.Length;
  86
  87                                 if (expression.EndsWith (".providername", StringComparison.InvariantCultureIgnoreCase)) {
  88                                         wantsProviderName = true;
  89                                         subidx -= 13;
  90                                 } else if (expression.EndsWith (".connectionstring", StringComparison.InvariantCultureIgnoreCase))
  91                                         subidx -= 17;
  92
  93                                 connStringName = expression.Substring (0, subidx);
  94                         }
  95
  96                         return new Pair (connStringName, wantsProviderName);
  97                 }
  98
  99                 public override bool SupportsEvaluate {
 100                         get { return true; }
 101                 }
 102         }
 103
 104 }
 105
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 108