mono/mcs/class/System.Data/System.Data.Odbc/OdbcFactory.cs

//
// System.Data.Odbc.OdbcFactory
//
// Author:
//   Sureshkumar T <[email protected]>
//
//
// Copyright (C) 2005 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

#region Using Directives
using System;
using System.Data;
using System.Data.Common;
using System.Security;
using System.Security.Permissions;
#endregion // Using Directives

namespace System.Data.Odbc 
{
        
        public sealed class OdbcFactory : DbProviderFactory
        {
                #region Fields
                public static readonly OdbcFactory Instance;
		static readonly object lockStatic = new object ();
                #endregion //Fields

                #region Constructors
		/// <remarks>
		/// public static variable Instance should hold the the singleton instance 
		/// based on the knowledge that custom factories without this instance variable
		/// ms.net  throws exception 
		/// <pre>
		/// System.InvalidOperationException: The requested .Net Framework Data 
		///             Provider's implementation does not have an Instance field 
		///             of a System.Data.Common.DbProviderFactory derived type.
		///     at System.Data.Common.DbProviderFactories.GetFactory(DataRow providerRow)
		///     at System.Data.Common.DbProviderFactories.GetFactory(String providerInvariantName)
		/// </pre>
		/// </remarks>
		static OdbcFactory() 
		{
                        lock (lockStatic) 
                        {
				if (Instance == null)
					Instance = new OdbcFactory ();
			}
		}
                
                private OdbcFactory()
                {
                        
                }
                
                #endregion //Constructors

                #region Methods
                public override DbConnection CreateConnection()
                {
                        return  new OdbcConnection () as DbConnection;
                }
                
                public override DbCommand CreateCommand()
                {
                        return new OdbcCommand () as DbCommand;
                }
                
                public override DbCommandBuilder CreateCommandBuilder()
                {
                        return new OdbcCommandBuilder () as DbCommandBuilder;
                }
                
                
		public override DbConnectionStringBuilder CreateConnectionStringBuilder ()
		{
			return new OdbcConnectionStringBuilder () as DbConnectionStringBuilder;
		}
                
                public override DbDataAdapter CreateDataAdapter()
                {
                        return new OdbcDataAdapter () as DbDataAdapter;
                }
                
                public override DbParameter CreateParameter()
                {
                        return new OdbcParameter () as DbParameter;
                }

		public override CodeAccessPermission CreatePermission (PermissionState state)
		{
			return new OdbcPermission (state);
		}

                #endregion //Methods
        }
}
#endif // NET_2_0