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WrapperBase.java

/*
 Copyright (c) 2002, 2010, 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 $Id$
 */
00045 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)
       */
00056       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();
      }
      
00077       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
             */
00115             private Object proxyIfInterfaceIsJdbc(Object toProxy, Class clazz) {
                  Class[] interfaces = clazz.getInterfaces();
                  
                  for (int i = 0; i < interfaces.length; i++) {
                        String packageName = interfaces[i].getPackage().getName();
                        
                        if ("java.sql".equals(packageName) || 
                                    "javax.sql".equals(packageName)) {
                              return Proxy.newProxyInstance(toProxy.getClass()
                                          .getClassLoader(), interfaces,
                                          new ConnectionErrorFiringInvocationHandler(toProxy));
                        }
                        
                        return proxyIfInterfaceIsJdbc(toProxy, interfaces[i]);
                  }
                  
                  return toProxy;
            }
      }
}

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