Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / DbProviderFactories.cs / 1 / DbProviderFactories.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Common { using System; using System.Collections; using System.Configuration; using System.Data; using System.Diagnostics; using System.Globalization; using System.Xml; #if WINFSInternalOnly internal #else public #endif static class DbProviderFactories { private const string AssemblyQualifiedName = "AssemblyQualifiedName"; private const string Instance = "Instance"; private const string InvariantName = "InvariantName"; private static ConnectionState _initState; // closed, connecting, open private static DataSet _configTable; private static object _lockobj = new object(); static public DbProviderFactory GetFactory(string providerInvariantName) { ADP.CheckArgumentLength(providerInvariantName, "providerInvariantName"); DataSet configTable = GetConfigTable(); DataTable providerTable = ((null != configTable) ? configTable.Tables[DbProviderFactoriesConfigurationHandler.providerGroup] : null); if (null != providerTable) { // we don't need to copy the DataTable because its used in a controlled fashion // also we don't need to create a blank datatable because we know the information won't exist #if DEBUG DataColumn[] pkey = providerTable.PrimaryKey; Debug.Assert(null != providerTable.Columns[InvariantName], "missing primary key column"); Debug.Assert((null != pkey) && (1 == pkey.Length) && (InvariantName == pkey[0].ColumnName), "bad primary key"); #endif DataRow providerRow = providerTable.Rows.Find(providerInvariantName); if (null != providerRow) { return DbProviderFactories.GetFactory(providerRow); } } throw ADP.ConfigProviderNotFound(); } static public DbProviderFactory GetFactory(DataRow providerRow) { ADP.CheckArgumentNull(providerRow, "providerRow"); // fail with ConfigProviderMissing rather than ColumnNotInTheTable exception DataColumn column = providerRow.Table.Columns[AssemblyQualifiedName]; if (null != column) { // column value may not be a string string assemblyQualifiedName = providerRow[column] as string; if (!ADP.IsEmpty(assemblyQualifiedName)) { // FXCop is concerned about the following line call to Get Type, // If this code is deemed safe during our security review we should add this warning to our exclusion list. // FXCop Message, pertaining to the call to GetType. // // Secure late-binding methods,System.Data.dll!System.Data.Common.DbProviderFactories.GetFactory(System.Data.DataRow):System.Data.Common.DbProviderFactory, Type providerType = Type.GetType(assemblyQualifiedName); if (null != providerType) { System.Reflection.FieldInfo providerInstance = providerType.GetField(Instance, System.Reflection.BindingFlags.DeclaredOnly|System.Reflection.BindingFlags.Public|System.Reflection.BindingFlags.Static); if (null != providerInstance) { Debug.Assert(providerInstance.IsPublic, "field not public"); Debug.Assert(providerInstance.IsStatic, "field not static"); if (providerInstance.FieldType.IsSubclassOf(typeof(DbProviderFactory))) { object factory = providerInstance.GetValue(null); if (null != factory) { return (DbProviderFactory)factory; } // else throw ConfigProviderInvalid } // else throw ConfigProviderInvalid } throw ADP.ConfigProviderInvalid(); } throw ADP.ConfigProviderNotInstalled(); } // else throw ConfigProviderMissing } throw ADP.ConfigProviderMissing(); } static public DataTable GetFactoryClasses() { // V1.2.3300 DataSet configTable = GetConfigTable(); DataTable dataTable = ((null != configTable) ? configTable.Tables[DbProviderFactoriesConfigurationHandler.providerGroup] : null); if (null != dataTable) { dataTable = dataTable.Copy(); } else { dataTable = DbProviderFactoriesConfigurationHandler.CreateProviderDataTable(); } return dataTable; } static private DataSet GetConfigTable() { Initialize(); return _configTable; } static private void Initialize() { if (ConnectionState.Open != _initState) { lock (_lockobj) { switch(_initState) { case ConnectionState.Closed: _initState = ConnectionState.Connecting; // used for preventing recursion try { _configTable = PrivilegedConfigurationManager.GetSection(DbProviderFactoriesConfigurationHandler.sectionName) as DataSet; } finally { _initState = ConnectionState.Open; } break; case ConnectionState.Connecting: case ConnectionState.Open: break; default: Debug.Assert(false, "unexpected state"); break; } } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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