2 // System.Data.Common.DbProviderFactories.cs
5 // Sureshkumar T (tsureshkumar@novell.com)
6 // Tim Coleman (tim@timcoleman.com)
8 // Copyright (C) Tim Coleman, 2003
12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
14 // Permission is hereby granted, free of charge, to any person obtaining
15 // a copy of this software and associated documentation files (the
16 // "Software"), to deal in the Software without restriction, including
17 // without limitation the rights to use, copy, modify, merge, publish,
18 // distribute, sublicense, and/or sell copies of the Software, and to
19 // permit persons to whom the Software is furnished to do so, subject to
20 // the following conditions:
22 // The above copyright notice and this permission notice shall be
23 // included in all copies or substantial portions of the Software.
25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
36 using System.Threading;
37 using System.Reflection;
38 using System.Collections;
39 using System.Configuration;
41 namespace System.Data.Common {
42 public static class DbProviderFactories
44 private static object configEntries = null; // DataSet
46 private const string CONFIG_SECTION_NAME = "system.data";
47 private const string CONFIG_SEC_TABLE_NAME = "DbProviderFactories";
51 public static DbProviderFactory GetFactory (DataRow providerRow)
53 string assemblyType = (string) providerRow ["AssemblyQualifiedName"];
54 Type type = Type.GetType (assemblyType, false, true);
55 if (type != null && type.IsSubclassOf (typeof (DbProviderFactory))) {
56 // Provider factories are singletons with Instance field having
58 FieldInfo field = type.GetField ("Instance", BindingFlags.Public |
61 return field.GetValue (null) as DbProviderFactory;
66 throw new ConfigurationException("DataProvider is missing!");
69 public static DbProviderFactory GetFactory (string providerInvariantName)
71 DataTable table = GetFactoryClasses ();
73 DataRow row = table.Rows.Find (providerInvariantName);
75 return GetFactory (row);
77 throw new ConfigurationException ("DataProvider is not found!");
80 public static DataTable GetFactoryClasses ()
82 DataSet ds = GetConfigEntries ();
83 DataTable table = ds != null ? ds.Tables [CONFIG_SEC_TABLE_NAME] : null;
85 table = table.Copy (); // avoid modifications by user
91 #region Internal Methods
92 internal static DataSet GetConfigEntries ()
95 if (configEntries != null)
96 return configEntries as DataSet;
98 DataSet ds = (DataSet) ConfigurationSettings.GetConfig (CONFIG_SECTION_NAME);
99 Interlocked.CompareExchange (ref configEntries, ds, null);
100 return configEntries as DataSet;
102 #endregion Internal Methods