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130 lines
4.8 KiB
130 lines
4.8 KiB
#if MYSQL_6_10
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// Copyright ?2004, 2018, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using Externals.MySql.Data.MySqlClient;
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namespace Externals.MySql.Data.MySqlClient.Interceptors
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{
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/// <summary>
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/// BaseExceptionInterceptor is the base class that should be used for all userland
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/// exception interceptors.
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/// </summary>
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internal abstract class BaseExceptionInterceptor
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{
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/// <summary>
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/// Returns the received exception.
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/// </summary>
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/// <param name="exception">The exception to be returned.</param>
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/// <returns>The exception originally received.</returns>
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public abstract Exception InterceptException(Exception exception);
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/// <summary>
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/// Gets the active connection.
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/// </summary>
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protected MySqlConnection ActiveConnection { get; private set; }
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/// <summary>
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/// Initilizes this object by setting the active connection.
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/// </summary>
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/// <param name="connection">The connection to become active.</param>
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public virtual void Init(MySqlConnection connection)
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{
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ActiveConnection = connection;
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}
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}
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/// <summary>
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/// StandardExceptionInterceptor is the standard interceptor that simply returns the exception.
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/// It is the default action.
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/// </summary>
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internal sealed class StandardExceptionInterceptor : BaseExceptionInterceptor
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{
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/// <summary>
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/// Returns the received exception, which is the default action
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/// </summary>
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/// <param name="exception">The exception to be returned.</param>
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/// <returns>The exception originally received.</returns>
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public override Exception InterceptException(Exception exception)
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{
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return exception;
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}
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}
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/// <summary>
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/// ExceptionInterceptor is the "manager" class that keeps the list of registered interceptors
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/// for the given connection.
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/// </summary>
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internal sealed class ExceptionInterceptor : Interceptor
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{
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readonly List<BaseExceptionInterceptor> _interceptors = new List<BaseExceptionInterceptor>();
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public ExceptionInterceptor(MySqlConnection connection)
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{
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Connection = connection;
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LoadInterceptors(connection.Settings.ExceptionInterceptors);
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// we always have the standard interceptor
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_interceptors.Add(new StandardExceptionInterceptor());
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}
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protected override void AddInterceptor(object o)
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{
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if (o == null)
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throw new ArgumentException("Unable to instantiate ExceptionInterceptor");
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if (!(o is BaseExceptionInterceptor))
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throw new InvalidOperationException(String.Format(Resources.TypeIsNotExceptionInterceptor,
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o.GetType()));
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BaseExceptionInterceptor ie = o as BaseExceptionInterceptor;
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ie.Init(Connection);
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_interceptors.Insert(0, (BaseExceptionInterceptor)o);
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}
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public void Throw(Exception exception)
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{
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Exception e = _interceptors.Aggregate(exception, (current, ie) => ie.InterceptException(current));
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throw e;
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}
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#if !NETSTANDARD1_3
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protected override string ResolveType(string nameOrType)
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{
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if (MySqlConfiguration.Settings == null || MySqlConfiguration.Settings.ExceptionInterceptors == null)
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return base.ResolveType(nameOrType);
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foreach (InterceptorConfigurationElement e in MySqlConfiguration.Settings.ExceptionInterceptors)
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if (String.Compare(e.Name, nameOrType, true) == 0)
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return e.Type;
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return base.ResolveType(nameOrType);
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}
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#endif
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}
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}
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#endif
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