//
// System.Data.Common.DbProviderFactories.cs
//
// Author:
// Sureshkumar T (tsureshkumar@novell.com)
// Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2003
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.Threading;
using System.Reflection;
using System.Collections;
using System.Configuration;
namespace System.Data.Common{
public static class DbProviderFactories
{
private static object configEntries = null; // DataSet
internal const string CONFIG_SECTION_NAME = "system.data";
internal const string CONFIG_SEC_TABLE_NAME = "DbProviderFactories";
#region Methods
public static DbProviderFactory GetFactory (DataRow providerRow)
{
string assemblyType = (string) providerRow ["AssemblyQualifiedName"];
#if TARGET_JVM // case insensitive GetType is not supported
Type type = Type.GetType (assemblyType, false);
#else
Type type = Type.GetType (assemblyType, false, true);
#endif
if (type != null && type.IsSubclassOf (typeof (DbProviderFactory))) {
// Provider factories are singletons with Instance field having
// the sole instance
FieldInfo field = type.GetField ("Instance", BindingFlags.Public |
BindingFlags.Static);
if (field != null) {
return field.GetValue (null) as DbProviderFactory;
}
}
throw new ConfigurationErrorsException("Failed to find or load the registered .Net Framework Data Provider.");
}
public static DbProviderFactory GetFactory (string providerInvariantName)
{
DataTable table = GetFactoryClasses ();
if (table != null) {
DataRow row = table.Rows.Find (providerInvariantName);
if (row != null)
return GetFactory (row);
}
throw new ConfigurationErrorsException (String.Format("Failed to find or load the registered .Net Framework Data Provider '{0}'.", providerInvariantName));
}
public static DataTable GetFactoryClasses ()
{
DataSet ds = GetConfigEntries ();
DataTable table = ds != null ? ds.Tables [CONFIG_SEC_TABLE_NAME] : null;
if (table != null)
table = table.Copy (); // avoid modifications by user
return table;
}
#endregion // Methods
#region Internal Methods
internal static DataSet GetConfigEntries ()
{
if (configEntries != null)
return configEntries as DataSet;
DataSet ds = (DataSet) ConfigurationManager.GetSection (CONFIG_SECTION_NAME);
Interlocked.CompareExchange (ref configEntries, ds, null);
return configEntries as DataSet;
}
#endregion Internal Methods
}
}
#endif // NET_2_0
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