mcs/class/System.Web/System.Web.Configuration_2.0/ProvidersHelper.cs

   1 //
   2 // System.Web.Configuration.ProvidersHelper
   3 //
   4 // Authors:
   5 //      Chris Toshok (toshok@ximian.com)
   6 //
   7 // (C) 2005 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 #if NET_2_0
  31
  32 using System;
  33 using System.Collections;
  34 using System.Configuration;
  35 using System.Configuration.Provider;
  36 using System.Data.Common;
  37 using System.Data.SqlClient;
  38 using System.IO;
  39 using System.Reflection;
  40 using System.Web.Compilation;
  41
  42 namespace System.Web.Configuration {
  43
  44         public static class ProvidersHelper
  45         {
  46                 private static string privateBinPath = null;
  47
  48                 public static ProviderBase InstantiateProvider (ProviderSettings providerSettings, Type providerType)
  49                 {
  50                         Type settingsType = Type.GetType (providerSettings.Type);
  51                         if (settingsType == null && Directory.Exists (PrivateBinPath)) {
  52                                 string [] binDlls = Directory.GetFiles (PrivateBinPath, "*.dll");
  53                                 foreach (string s in binDlls) {
  54                                         Assembly binA = Assembly.LoadFrom (s);
  55                                         settingsType = binA.GetType (providerSettings.Type);
  56                                         if (settingsType != null)
  57                                                 break;
  58                                 }
  59                         }
  60
  61                         // check App_Code dlls
  62                         if (settingsType == null) {
  63                                 IList appCode = BuildManager.CodeAssemblies;
  64
  65                                 if (appCode != null && appCode.Count > 0) {
  66                                         Assembly asm;
  67                                         foreach (object o in appCode) {
  68                                                 asm = o as Assembly;
  69                                                 if (asm == null)
  70                                                         continue;
  71                                                 settingsType = asm.GetType (providerSettings.Type);
  72                                                 if (settingsType != null)
  73                                                         break;
  74                                         }
  75                                 }
  76                         }
  77
  78                         if (settingsType == null)
  79                                 throw new ConfigurationErrorsException (String.Format ("Could not find type: {0}",
  80                                                                                        providerSettings.Type));
  81                         if (!providerType.IsAssignableFrom (settingsType))
  82                                 throw new ConfigurationErrorsException (String.Format ("Provider '{0}' must subclass from '{1}'",
  83                                                                                        providerSettings.Name, providerType));
  84
  85                         ProviderBase provider = Activator.CreateInstance (settingsType) as ProviderBase;
  86
  87                         provider.Initialize (providerSettings.Name, providerSettings.Parameters);
  88
  89                         return provider;
  90                 }
  91
  92                 private static string PrivateBinPath {
  93                         get {
  94                                 if (privateBinPath != null)
  95                                         return privateBinPath;
  96
  97                                 AppDomainSetup setup = AppDomain.CurrentDomain.SetupInformation;
  98                                 privateBinPath = Path.Combine (setup.ApplicationBase, setup.PrivateBinPath);
  99
 100                                 return privateBinPath;
 101                         }
 102                 }
 103
 104                 public static void InstantiateProviders (ProviderSettingsCollection configProviders, ProviderCollection providers, Type providerType)
 105                 {
 106                         if (!typeof (ProviderBase).IsAssignableFrom (providerType))
 107                                 throw new ConfigurationErrorsException (String.Format ("type '{0}' must subclass from ProviderBase", providerType));
 108
 109                         foreach (ProviderSettings settings in configProviders)
 110                                 providers.Add (InstantiateProvider (settings, providerType));
 111                 }
 112
 113                 internal static DbProviderFactory GetDbProviderFactory (string providerName)
 114                 {
 115                         DbProviderFactory f = null;
 116
 117                         if (providerName != null && providerName != "") {
 118                                 try {
 119                                         f = DbProviderFactories.GetFactory(providerName);
 120                                 }
 121                                 catch (Exception e) { Console.WriteLine (e); /* nada */ }
 122                                 if (f != null)
 123                                         return f;
 124                         }
 125
 126                         return SqlClientFactory.Instance;
 127                 }
 128         }
 129
 130 }
 131
 132 #endif
 133