source: Ballon/out/artifacts/geisa_artifact/WEB-INF/lib/mysql-connector-java-5.1.21/src/com/mysql/jdbc/jdbc2/optional/WrapperBase.java @ 848

/*
 Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
 

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA


 
 */
package com.mysql.jdbc.jdbc2.optional;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.SQLException;
import java.util.Map;

import com.mysql.jdbc.ExceptionInterceptor;
import com.mysql.jdbc.SQLError;

/**
 * Base class for all wrapped instances created by LogicalHandle
 * 
 * @author Mark matthews
 * 
 * @version $Id$
 */
abstract class WrapperBase {
        protected MysqlPooledConnection pooledConnection;

        /**
         * Fires connection error event if required, before re-throwing exception
         * 
         * @param sqlEx
         *            the SQLException that has ocurred
         * @throws SQLException
         *             (rethrown)
         */
        protected void checkAndFireConnectionError(SQLException sqlEx)
                        throws SQLException {
                if (this.pooledConnection != null) {
                        if (SQLError.SQL_STATE_COMMUNICATION_LINK_FAILURE.equals(sqlEx
                                        .getSQLState())) {
                                this.pooledConnection.callConnectionEventListeners(
                                                MysqlPooledConnection.CONNECTION_ERROR_EVENT, sqlEx);
                        }
                }

                throw sqlEx;
        }
        
        protected Map unwrappedInterfaces = null;
        protected ExceptionInterceptor exceptionInterceptor;

        protected WrapperBase(MysqlPooledConnection pooledConnection) {
                this.pooledConnection = pooledConnection;
                this.exceptionInterceptor = this.pooledConnection.getExceptionInterceptor();
        }
        
        protected class ConnectionErrorFiringInvocationHandler implements InvocationHandler {
                Object invokeOn = null;
                
                public ConnectionErrorFiringInvocationHandler(Object toInvokeOn) {
                        invokeOn = toInvokeOn;
                }
                
                public Object invoke(Object proxy, Method method,
                                Object[] args) throws Throwable {
                        Object result = null;

                        try {
                                result = method.invoke(invokeOn, args);
                                
                                if (result != null) {
                                        result = proxyIfInterfaceIsJdbc(result, 
                                                        result.getClass());
                                }
                        } catch (InvocationTargetException e) {
                                if (e.getTargetException() instanceof SQLException) {
                                        checkAndFireConnectionError((SQLException) e
                                                        .getTargetException());
                                } else {
                                        throw e;
                                }
                        }

                        return result;
                }
                
                /**
                 * Recursively checks for interfaces on the given object to determine
                 * if it implements a java.sql interface, and if so, proxies the 
                 * instance so that we can catch and fire SQL errors.
                 * @param toProxy
                 * @param clazz
                 * @return
                 */
                private Object proxyIfInterfaceIsJdbc(Object toProxy, Class<?> clazz) {
                        Class<?>[] interfaces = clazz.getInterfaces();
                        
                        for (Class<?> iclass : interfaces) {
                                String packageName = iclass.getPackage().getName();
                                
                                if ("java.sql".equals(packageName) || 
                                                "javax.sql".equals(packageName)) {
                                        return Proxy.newProxyInstance(toProxy.getClass()
                                                        .getClassLoader(), interfaces,
                                                        new ConnectionErrorFiringInvocationHandler(toProxy));
                                }
                                
                                return proxyIfInterfaceIsJdbc(toProxy, iclass);
                        }
                        
                        return toProxy;
                }
        }
}